Anyone know a simple way to round up a figure to the nearest 0.5?
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Round up to nearest 0.5
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Post hoc ergo Propter hoc
Sorry about the lengthy post.
Do not know which forum to send this to because it could apply to almost any of them.
If there are two time series, each with a certain amount of random noise. A and B. (There are also related time series C, D, E, etc but these have (postulated) minor effects.)
And if it is concluded that A has a driving influence on B because of a logical mechanism in the chemistry/physics/mechanics/economics of which they are both a part. But an argument can be made for B causing A.
They are certainly linked in some way, possibly both driven by some other parameter X or both influencing each other in a limited positive feedback.
Long term trends show movements in the same direction in both A and B. Averageing over shorter intervals show some movement in the same direction, but at times in opposite directions.
Logic tends to favour the leading series causing the lagging one, rather than the other way around, but if Bs (major) effect on A is slow to come about and that (ninor one) of A on B instantaneous, the time difference in the two series could be the "wrong" way round, especially if both are non linear or limited at their extreme values.
My question is:
Is this a class of problem which can be approached mathematically by looking at, say, first second and third differentials, or the effect of smoothing parameters.?
If one wants to play with examples, MathCad seems to be a perfect tool to use. Has anyone done that.?
Can one prove or invalidate an argument that says that because the plot of A moves in advance of B, it must be the cause. ?
I am thinking about chemical reactions, or biological populations of bacteria, or even the economics of oil exploration expenditure slowly responding to volatile price rises but being constrained by numbers of available drilling rigs and then not decreasing as quickly when prices fall. (because you don't stop at half an oil well)
There are people who make the unfashionable case for total CO2 levels in the atmosphere being driven by the average global temperature, certainly methane levels are.
In some of the longer term plots that I have seen, the fluctuations in temperature appears to lead those in corresponding gases. Could this just be an artifact of the way the graphs are assembled.?
I am less concerned with the rights and wrongs of the examples quoted than with the possibility of establishing or disproving the hypothoses mathematically.
(Please do not quote all those IPCC climate models that we see described in the press as proof, because they all start by assuming a particular mechanism to be the case. I saw enough Finite Element Models of North Sea and other oil and gas reservoirs to be skeptical - even when a good history match has been obtained. Like Neural Nets, it is too easy to fit the data when the parameters are loosely defined.)
TOM
Do not know which forum to send this to because it could apply to almost any of them.
If there are two time series, each with a certain amount of random noise. A and B. (There are also related time series C, D, E, etc but these have (postulated) minor effects.)
And if it is concluded that A has a driving influence on B because of a logical mechanism in the chemistry/physics/mechanics/economics of which they are both a part. But an argument can be made for B causing A.
They are certainly linked in some way, possibly both driven by some other parameter X or both influencing each other in a limited positive feedback.
Long term trends show movements in the same direction in both A and B. Averageing over shorter intervals show some movement in the same direction, but at times in opposite directions.
Logic tends to favour the leading series causing the lagging one, rather than the other way around, but if Bs (major) effect on A is slow to come about and that (ninor one) of A on B instantaneous, the time difference in the two series could be the "wrong" way round, especially if both are non linear or limited at their extreme values.
My question is:
Is this a class of problem which can be approached mathematically by looking at, say, first second and third differentials, or the effect of smoothing parameters.?
If one wants to play with examples, MathCad seems to be a perfect tool to use. Has anyone done that.?
Can one prove or invalidate an argument that says that because the plot of A moves in advance of B, it must be the cause. ?
I am thinking about chemical reactions, or biological populations of bacteria, or even the economics of oil exploration expenditure slowly responding to volatile price rises but being constrained by numbers of available drilling rigs and then not decreasing as quickly when prices fall. (because you don't stop at half an oil well)
There are people who make the unfashionable case for total CO2 levels in the atmosphere being driven by the average global temperature, certainly methane levels are.
In some of the longer term plots that I have seen, the fluctuations in temperature appears to lead those in corresponding gases. Could this just be an artifact of the way the graphs are assembled.?
I am less concerned with the rights and wrongs of the examples quoted than with the possibility of establishing or disproving the hypothoses mathematically.
(Please do not quote all those IPCC climate models that we see described in the press as proof, because they all start by assuming a particular mechanism to be the case. I saw enough Finite Element Models of North Sea and other oil and gas reservoirs to be skeptical - even when a good history match has been obtained. Like Neural Nets, it is too easy to fit the data when the parameters are loosely defined.)
TOM
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Mathcad14 / Windows10 and DLLs
Hi all, I've installed Mathcad14 on Windows10. Mathcad seems to run fine but I cannot run DLLs any more(not even the example DLLs in the userfi executable folders). Anyone has any expertise nice with running and compiling Mathcad14 DLLs in a Windows10 environment.
I've also tried to complile some DLLs the same way that did in a WindowsXP (using studio 2010 express) environment but I was not successful (compliles ok but Mathcad cannot access/read the DLL).
Any help is appreciate. Geo
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Advanced Topic - Generating a Difficult Matrix
OK...so this is fairly advanced question. I am not expecting a solution, but rather:
1 - Is MathCAD really the way to go or should I try a different software? I love mathcad for so many things, but I am not sure if this is one of them.
2 - If MathCAD can do this (within reason), are there some good resources for similiar types of solutions? I am just looking for a little direction.
Thanks!
1 - Is MathCAD really the way to go or should I try a different software? I love mathcad for so many things, but I am not sure if this is one of them.
2 - If MathCAD can do this (within reason), are there some good resources for similiar types of solutions? I am just looking for a little direction.
Thanks!
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This variable is undefined error when using Given/Find function, why?
Hi Everyone,
I have been using mathcad for some time but it is not until recently i started trying the Given / Find functions.
However, every time i try it, it gives me "This variable is undefined" error right after i enter the Find(...) command and hit the "=" button.
I even tried to follow the quick sheet in the tutorial/help document and it is still happening.
Could someone help me out?
Greatly apprecitated!
Alex J
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Mathcad 15 won't run on Windows 7
Hi
I have a computere with windows 7 x64 there, no matter what i do, won't run mathcad 15.
The installation seems to be completed without any problems, but when i try to run the application, the splash screen shows up, but after a short period of time, the application crash without any error messages except the Windows own "Mathcad application has stopped working". I have another computer also with windows 7 x64, and here the application will start without any problems . The only differense between these computers is that the first one is a "samsung" installation width showelware and all, and computer nr. 2 is a vanilla installation of windows.
I have tried the following
Reinstallation of MSXML 4.0 SP.2
---------||--------- of .Net, i can't remember the version, but it was the newest I could find.
Reinstallation of the computer (with the samsung disk)
But nothing seems to work. Mathcad 14 worked without any problems...
I hope somebody will help, and sorry for my bad english, i´m a dane
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Round up to nearest 0.5
Anyone know a simple way to round up a figure to the nearest 0.5?
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Hot keys ?
see screenshot attached. i have to type quite monotonous expressions in mathcad atm (found no way to automate the task). like
X.2=X.1+X.4+X.5=explicit,ALL->
you know i'd like to press 1 button insted of three. like i press 25 -> X.25 is typed.
space pressed -> explicit,ALL= typed
With a switch (with scroll lock key for ex.) in typing hotkeys/normal.
I wonder if it can be future mathcad feature, but atm maybe it can be done with third party key hooker or smth ? I remember Autohook for autocad for ex.
Any suggestions/links to soft are welcome.
X.2=X.1+X.4+X.5=explicit,ALL->
you know i'd like to press 1 button insted of three. like i press 25 -> X.25 is typed.
space pressed -> explicit,ALL= typed
With a switch (with scroll lock key for ex.) in typing hotkeys/normal.
I wonder if it can be future mathcad feature, but atm maybe it can be done with third party key hooker or smth ? I remember Autohook for autocad for ex.
Any suggestions/links to soft are welcome.
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How to move thread to new forum
The "Mie Scattering" topic here really belongs in Physics. It was started in 2003 in this forum as a single posting with no replies. When I replied (3 years later!) last week, I didn't think about which forum it was in, and now there is a short thread which I can't move: but is there a moderator who can?
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Post hoc ergo Propter hoc
Sorry about the lengthy post.
Do not know which forum to send this to because it could apply to almost any of them.
If there are two time series, each with a certain amount of random noise. A and B. (There are also related time series C, D, E, etc but these have (postulated) minor effects.)
And if it is concluded that A has a driving influence on B because of a logical mechanism in the chemistry/physics/mechanics/economics of which they are both a part. But an argument can be made for B causing A.
They are certainly linked in some way, possibly both driven by some other parameter X or both influencing each other in a limited positive feedback.
Long term trends show movements in the same direction in both A and B. Averageing over shorter intervals show some movement in the same direction, but at times in opposite directions.
Logic tends to favour the leading series causing the lagging one, rather than the other way around, but if Bs (major) effect on A is slow to come about and that (ninor one) of A on B instantaneous, the time difference in the two series could be the "wrong" way round, especially if both are non linear or limited at their extreme values.
My question is:
Is this a class of problem which can be approached mathematically by looking at, say, first second and third differentials, or the effect of smoothing parameters.?
If one wants to play with examples, MathCad seems to be a perfect tool to use. Has anyone done that.?
Can one prove or invalidate an argument that says that because the plot of A moves in advance of B, it must be the cause. ?
I am thinking about chemical reactions, or biological populations of bacteria, or even the economics of oil exploration expenditure slowly responding to volatile price rises but being constrained by numbers of available drilling rigs and then not decreasing as quickly when prices fall. (because you don't stop at half an oil well)
There are people who make the unfashionable case for total CO2 levels in the atmosphere being driven by the average global temperature, certainly methane levels are.
In some of the longer term plots that I have seen, the fluctuations in temperature appears to lead those in corresponding gases. Could this just be an artifact of the way the graphs are assembled.?
I am less concerned with the rights and wrongs of the examples quoted than with the possibility of establishing or disproving the hypothoses mathematically.
(Please do not quote all those IPCC climate models that we see described in the press as proof, because they all start by assuming a particular mechanism to be the case. I saw enough Finite Element Models of North Sea and other oil and gas reservoirs to be skeptical - even when a good history match has been obtained. Like Neural Nets, it is too easy to fit the data when the parameters are loosely defined.)
TOM
Do not know which forum to send this to because it could apply to almost any of them.
If there are two time series, each with a certain amount of random noise. A and B. (There are also related time series C, D, E, etc but these have (postulated) minor effects.)
And if it is concluded that A has a driving influence on B because of a logical mechanism in the chemistry/physics/mechanics/economics of which they are both a part. But an argument can be made for B causing A.
They are certainly linked in some way, possibly both driven by some other parameter X or both influencing each other in a limited positive feedback.
Long term trends show movements in the same direction in both A and B. Averageing over shorter intervals show some movement in the same direction, but at times in opposite directions.
Logic tends to favour the leading series causing the lagging one, rather than the other way around, but if Bs (major) effect on A is slow to come about and that (ninor one) of A on B instantaneous, the time difference in the two series could be the "wrong" way round, especially if both are non linear or limited at their extreme values.
My question is:
Is this a class of problem which can be approached mathematically by looking at, say, first second and third differentials, or the effect of smoothing parameters.?
If one wants to play with examples, MathCad seems to be a perfect tool to use. Has anyone done that.?
Can one prove or invalidate an argument that says that because the plot of A moves in advance of B, it must be the cause. ?
I am thinking about chemical reactions, or biological populations of bacteria, or even the economics of oil exploration expenditure slowly responding to volatile price rises but being constrained by numbers of available drilling rigs and then not decreasing as quickly when prices fall. (because you don't stop at half an oil well)
There are people who make the unfashionable case for total CO2 levels in the atmosphere being driven by the average global temperature, certainly methane levels are.
In some of the longer term plots that I have seen, the fluctuations in temperature appears to lead those in corresponding gases. Could this just be an artifact of the way the graphs are assembled.?
I am less concerned with the rights and wrongs of the examples quoted than with the possibility of establishing or disproving the hypothoses mathematically.
(Please do not quote all those IPCC climate models that we see described in the press as proof, because they all start by assuming a particular mechanism to be the case. I saw enough Finite Element Models of North Sea and other oil and gas reservoirs to be skeptical - even when a good history match has been obtained. Like Neural Nets, it is too easy to fit the data when the parameters are loosely defined.)
TOM
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Help - Searching user forums
Ok, am I missing something? The search tool on these user forums is really annoying me to the point that it makes them almost useless to me. I perform a search and get a list of results. After I view one of the results, I want to go back to the search results to look at other messages. Every time I go back (using the browser back button) I get a page expired error! This is highly annoying. Is there a way around this??!?
Thanks for any tips!
Melissa
Thanks for any tips!
Melissa
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Participating Through a Newsreader
Can anybody tell me how to participate here via newsreader, like Outlook Express.
I don't find enough information in Help, like where is the "Conference Profiles page"
"... Log in to the board whose newsgroups you want to subscribe to.
Click More on the WebBoard menubar. The More Options menu appears.
Click Conference Profiles from the menu. The Conference Profiles page appears.
Note the news server name that appears in the list heading just before Newsgroups. It looks like a domain name, for example, lss.srcc.edu ..."
Sincerely,
Jelena
I don't find enough information in Help, like where is the "Conference Profiles page"
"... Log in to the board whose newsgroups you want to subscribe to.
Click More on the WebBoard menubar. The More Options menu appears.
Click Conference Profiles from the menu. The Conference Profiles page appears.
Note the news server name that appears in the list heading just before Newsgroups. It looks like a domain name, for example, lss.srcc.edu ..."
Sincerely,
Jelena
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logspace and logrange
From PTC Forum http://www.ptc.com/forums/viewtopic.php?t=2545
Question: Is it possible to define a range variable with log base 10 spacing? I use this frequently in Matlab - and I'm trying to see if I can switch to mathcad...but so far I haven't beed able to locate any help on this...
Response: See attached file for functions logspace and logrange.
Stuart
Unknown COLLAB - LOGSPACE 01.MCD (138KB)
Look inside the collapsed Area called Vector Support Functions - double-click on the area to open it.
Question: Is it possible to define a range variable with log base 10 spacing? I use this frequently in Matlab - and I'm trying to see if I can switch to mathcad...but so far I haven't beed able to locate any help on this...
Response: See attached file for functions logspace and logrange.
Stuart
Unknown COLLAB - LOGSPACE 01.MCD (138KB)
Look inside the collapsed Area called Vector Support Functions - double-click on the area to open it.
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3D surfaces from f(x,y,z)=constant -
Does anyone know of a robust Mathcad program (Mathcad 12)- commercial or other - to do 3D surface plots where the surface is defined by
f(x,y,z)= CONSTANT
I have looked through the forums and while there was some mention of it in the past - no resolution appeared from this
I have numerous needs for such and I know that it exists with other graphing programs but cannot seem to find one here
f(x,y,z)= CONSTANT
I have looked through the forums and while there was some mention of it in the past - no resolution appeared from this
I have numerous needs for such and I know that it exists with other graphing programs but cannot seem to find one here
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Mathcad Collaboratory User Forums Are Up!
The Mathcad Collaboratory User Forums at http://collab.mathsoft.com/~mathcad2000 are back up.
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This variable is undefined error when using Given/Find function, why?
Hi Everyone,
I have been using mathcad for some time but it is not until recently i started trying the Given / Find functions.
However, every time i try it, it gives me "This variable is undefined" error right after i enter the Find(...) command and hit the "=" button.
I even tried to follow the quick sheet in the tutorial/help document and it is still happening.
Could someone help me out?
Greatly apprecitated!
Alex J
↧
How to move thread to new forum
The "Mie Scattering" topic here really belongs in Physics. It was started in 2003 in this forum as a single posting with no replies. When I replied (3 years later!) last week, I didn't think about which forum it was in, and now there is a short thread which I can't move: but is there a moderator who can?
↧
↧
Post hoc ergo Propter hoc
Sorry about the lengthy post.
Do not know which forum to send this to because it could apply to almost any of them.
If there are two time series, each with a certain amount of random noise. A and B. (There are also related time series C, D, E, etc but these have (postulated) minor effects.)
And if it is concluded that A has a driving influence on B because of a logical mechanism in the chemistry/physics/mechanics/economics of which they are both a part. But an argument can be made for B causing A.
They are certainly linked in some way, possibly both driven by some other parameter X or both influencing each other in a limited positive feedback.
Long term trends show movements in the same direction in both A and B. Averageing over shorter intervals show some movement in the same direction, but at times in opposite directions.
Logic tends to favour the leading series causing the lagging one, rather than the other way around, but if Bs (major) effect on A is slow to come about and that (ninor one) of A on B instantaneous, the time difference in the two series could be the "wrong" way round, especially if both are non linear or limited at their extreme values.
My question is:
Is this a class of problem which can be approached mathematically by looking at, say, first second and third differentials, or the effect of smoothing parameters.?
If one wants to play with examples, MathCad seems to be a perfect tool to use. Has anyone done that.?
Can one prove or invalidate an argument that says that because the plot of A moves in advance of B, it must be the cause. ?
I am thinking about chemical reactions, or biological populations of bacteria, or even the economics of oil exploration expenditure slowly responding to volatile price rises but being constrained by numbers of available drilling rigs and then not decreasing as quickly when prices fall. (because you don't stop at half an oil well)
There are people who make the unfashionable case for total CO2 levels in the atmosphere being driven by the average global temperature, certainly methane levels are.
In some of the longer term plots that I have seen, the fluctuations in temperature appears to lead those in corresponding gases. Could this just be an artifact of the way the graphs are assembled.?
I am less concerned with the rights and wrongs of the examples quoted than with the possibility of establishing or disproving the hypothoses mathematically.
(Please do not quote all those IPCC climate models that we see described in the press as proof, because they all start by assuming a particular mechanism to be the case. I saw enough Finite Element Models of North Sea and other oil and gas reservoirs to be skeptical - even when a good history match has been obtained. Like Neural Nets, it is too easy to fit the data when the parameters are loosely defined.)
TOM
Do not know which forum to send this to because it could apply to almost any of them.
If there are two time series, each with a certain amount of random noise. A and B. (There are also related time series C, D, E, etc but these have (postulated) minor effects.)
And if it is concluded that A has a driving influence on B because of a logical mechanism in the chemistry/physics/mechanics/economics of which they are both a part. But an argument can be made for B causing A.
They are certainly linked in some way, possibly both driven by some other parameter X or both influencing each other in a limited positive feedback.
Long term trends show movements in the same direction in both A and B. Averageing over shorter intervals show some movement in the same direction, but at times in opposite directions.
Logic tends to favour the leading series causing the lagging one, rather than the other way around, but if Bs (major) effect on A is slow to come about and that (ninor one) of A on B instantaneous, the time difference in the two series could be the "wrong" way round, especially if both are non linear or limited at their extreme values.
My question is:
Is this a class of problem which can be approached mathematically by looking at, say, first second and third differentials, or the effect of smoothing parameters.?
If one wants to play with examples, MathCad seems to be a perfect tool to use. Has anyone done that.?
Can one prove or invalidate an argument that says that because the plot of A moves in advance of B, it must be the cause. ?
I am thinking about chemical reactions, or biological populations of bacteria, or even the economics of oil exploration expenditure slowly responding to volatile price rises but being constrained by numbers of available drilling rigs and then not decreasing as quickly when prices fall. (because you don't stop at half an oil well)
There are people who make the unfashionable case for total CO2 levels in the atmosphere being driven by the average global temperature, certainly methane levels are.
In some of the longer term plots that I have seen, the fluctuations in temperature appears to lead those in corresponding gases. Could this just be an artifact of the way the graphs are assembled.?
I am less concerned with the rights and wrongs of the examples quoted than with the possibility of establishing or disproving the hypothoses mathematically.
(Please do not quote all those IPCC climate models that we see described in the press as proof, because they all start by assuming a particular mechanism to be the case. I saw enough Finite Element Models of North Sea and other oil and gas reservoirs to be skeptical - even when a good history match has been obtained. Like Neural Nets, it is too easy to fit the data when the parameters are loosely defined.)
TOM
↧
Help - Searching user forums
Ok, am I missing something? The search tool on these user forums is really annoying me to the point that it makes them almost useless to me. I perform a search and get a list of results. After I view one of the results, I want to go back to the search results to look at other messages. Every time I go back (using the browser back button) I get a page expired error! This is highly annoying. Is there a way around this??!?
Thanks for any tips!
Melissa
Thanks for any tips!
Melissa
↧
Participating Through a Newsreader
Can anybody tell me how to participate here via newsreader, like Outlook Express.
I don't find enough information in Help, like where is the "Conference Profiles page"
"... Log in to the board whose newsgroups you want to subscribe to.
Click More on the WebBoard menubar. The More Options menu appears.
Click Conference Profiles from the menu. The Conference Profiles page appears.
Note the news server name that appears in the list heading just before Newsgroups. It looks like a domain name, for example, lss.srcc.edu ..."
Sincerely,
Jelena
I don't find enough information in Help, like where is the "Conference Profiles page"
"... Log in to the board whose newsgroups you want to subscribe to.
Click More on the WebBoard menubar. The More Options menu appears.
Click Conference Profiles from the menu. The Conference Profiles page appears.
Note the news server name that appears in the list heading just before Newsgroups. It looks like a domain name, for example, lss.srcc.edu ..."
Sincerely,
Jelena
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