Solving Equations for undefined variable with units

January 22, 2014, 9:52 am

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So, I am confused on how to solve an equation for an unknown with units. I am not sure if I am having unit problems or if my way of stating variables is incorrect. I am simply just trying to solve for the variable "d" which should have units in length. How should I declare variables that rely on other known and unknown variables? When should I solve an equation symbolically and just numerically in terms of getting proper units? I am used to using maple 16 so switching to MathCAD has been fairly intiutive but I am failing to pick up on certain features. If you fix my MathCAD code, I should be able to figure it out from the fix solution. Thanks!

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Mathcad on Mac

July 15, 2008, 11:12 am

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Hello, Does anyone have any experience running Mathcad on a Mac, either using Parallels, Fusion or Bootcamp? If so please share your experience on ease of setup and performance. Also please include info on the Mac config, processor, RAM, etc. Thanks, Calvin

MathCad and Windows 7

February 21, 2010, 12:00 am

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Will Mathcad 11 work with Windows 7?

Solving Equations for undefined variable with units

January 22, 2014, 9:52 am

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So, I am confused on how to solve an equation for an unknown with units. I am not sure if I am having unit problems or if my way of stating variables is incorrect. I am simply just trying to solve for the variable "d" which should have units in length. How should I declare variables that rely on other known and unknown variables? When should I solve an equation symbolically and just numerically in terms of getting proper units? I am used to using maple 16 so switching to MathCAD has been fairly intiutive but I am failing to pick up on certain features. If you fix my MathCAD code, I should be able to figure it out from the fix solution. Thanks!

license server not starting

February 2, 2008, 1:21 pm

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Hi, We are running Mathcad using a license server. Unfortunately the server stopped working a couple of days ago. When trying to start the ptc_d daemon, the logfile shows 22:06:22 (lmgrd) ptc_d exited with status 25 (Invalid host) The hostname did not change, nor did the NIC. Any clues on what might be the problem?

Plotting a graph of the function f(x)

November 23, 2011, 7:36 am

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Hi all,

 

I am a newbie to the usage of mathcad and could do with some step by step help from you experts out there.

 

I have a mathcad problem:

 

I want to plot a graph of the function f(x) from the equation;

 

f(x) = x(14-7x)(16-7x)

            4(4-x)^2

 

I do not want to show the equation in the worksheet (and so imagine there will be some packets of data on the sheet somewhere that can be referenced to).

 

From the information I need to plot a graph of the function f(x) (repeated myself didn't I).

 

I would like the graph needs to cover the interval [0, 2.68] in the x direction and [0, 80] in the y direction.

 

If anybody can help (step by step because I'm thick....lol). I woul;d be really grateful.

 

Paul

Units incorrect? lbm, lbf

July 22, 2005, 12:00 am

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MathCad (2001i Pro) defines lbf (pound force) as 32.174 mass * length / time**2. Since we all recognize this as acceleration due to gravity we know the units are lbm, ft, and seconds squared. But the textbook definition of lbf is the above divided by the "gravitational constant" also 32.174 but the units include lbf in the denominator. This is critical; it shows that on earth, lbf and lbm are equivalent. But MathCad doesn't see it that way and it has been playing havoc with some gas calculations I'm doing. Any comments?

Windows7 64bit and Mathcad14

November 10, 2009, 12:00 am

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Hello to all who goes in front

I have not managed to get my M14 to run ;>(

I upgraded my workstation and have done all wich have been available, but still no go.

"Unable to create 12.0 engine factory" is only indicator of the problem before 14 start-up logo vanishes.

How is it PTC ? When can I get a working release ?

BR Matti

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Exporting from Mathcad to Word

June 17, 2011, 8:35 am

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Hi all!

 

When i copy from mathcad and paste to word (i tried different paste options) text is ok, but formulas are as pictures, it is also if i save as .rtf file. Is there any way to export formulas to word as text or equations, and not as pictures?

 

Thank you.

license server not starting

February 2, 2008, 1:21 pm

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Hi, We are running Mathcad using a license server. Unfortunately the server stopped working a couple of days ago. When trying to start the ptc_d daemon, the logfile shows 22:06:22 (lmgrd) ptc_d exited with status 25 (Invalid host) The hostname did not change, nor did the NIC. Any clues on what might be the problem?

Exporting from Mathcad to Word

June 17, 2011, 8:35 am

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Hi all!

 

When i copy from mathcad and paste to word (i tried different paste options) text is ok, but formulas are as pictures, it is also if i save as .rtf file. Is there any way to export formulas to word as text or equations, and not as pictures?

 

Thank you.

Prime 3.0 xmcd, mcd converter

February 17, 2014, 6:46 am

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Most of my 14/15 files failed conversion.  The conversion log only says "Conversion failed and Conversion aborted".  Why is this?

Mathcad 15 - Preferred units in results?

March 31, 2011, 10:10 am

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I am using Mathcad 15 for a course in Quantum Chemistry. Is there a way to set default units so that they match those commonly accepted in the dicipline?

 

For instance, when I calculate wavenumber, my result is in m^-1 rather than the commonly accepted cm^-1, and frequency is in s^-1 rather than Hz.

 

Thanks.

 

Best Regads,

Matthew

Yet another Find issue

March 24, 2015, 3:10 pm

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Hi, I'm trying to practice using the Find function, and using a workaround with units.

Pls. see attached. The units are working but the answer it found is wrong. "Io" is supposed to be 4.

Solving Equations for undefined variable with units

January 22, 2014, 9:52 am

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So, I am confused on how to solve an equation for an unknown with units. I am not sure if I am having unit problems or if my way of stating variables is incorrect. I am simply just trying to solve for the variable "d" which should have units in length. How should I declare variables that rely on other known and unknown variables? When should I solve an equation symbolically and just numerically in terms of getting proper units? I am used to using maple 16 so switching to MathCAD has been fairly intiutive but I am failing to pick up on certain features. If you fix my MathCAD code, I should be able to figure it out from the fix solution. Thanks!

---

Excel to Mathcad and Mathcad to Excel data transfer

October 24, 2011, 10:38 pm

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Dear all,

 

I got thanks a discussion chain some Mathcad macro's to read data in any worksheet in an excel file but thw woksheet name has to be known.

My data acquisition system generates automatically excel data table with every time new worksheet names.

Is it possible to obtain all the worksheet names of an excel file directly from Mathcad ?

 

Second question:

It is possible to read directly from Mathcad data within worksheet of Excel file and it works well.

Is it possible to do the reverse, ie to write data direclty from Mathcad in specific worksheets of an excel file ?

 

I have Mathcad 14 (will have mathcad 15 next year)

 

Thank you

 

P.Bujard

Prime 3.0 xmcd, mcd converter

February 17, 2014, 6:46 am

≫ Next: license server not starting

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Most of my 14/15 files failed conversion.  The conversion log only says "Conversion failed and Conversion aborted".  Why is this?

license server not starting

February 2, 2008, 1:21 pm

≫ Next: Mathcad 15 - Preferred units in results?

≪ Previous: Prime 3.0 xmcd, mcd converter

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Hi, We are running Mathcad using a license server. Unfortunately the server stopped working a couple of days ago. When trying to start the ptc_d daemon, the logfile shows 22:06:22 (lmgrd) ptc_d exited with status 25 (Invalid host) The hostname did not change, nor did the NIC. Any clues on what might be the problem?

Mathcad 15 - Preferred units in results?

March 31, 2011, 10:10 am

≫ Next: Solving Equations for undefined variable with units

≪ Previous: license server not starting

$

0

0

I am using Mathcad 15 for a course in Quantum Chemistry. Is there a way to set default units so that they match those commonly accepted in the dicipline?

 

For instance, when I calculate wavenumber, my result is in m^-1 rather than the commonly accepted cm^-1, and frequency is in s^-1 rather than Hz.

 

Thanks.

 

Best Regads,

Matthew

Solving Equations for undefined variable with units

January 22, 2014, 9:52 am

≫ Next: Excel to Mathcad and Mathcad to Excel data transfer

≪ Previous: Mathcad 15 - Preferred units in results?

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0

So, I am confused on how to solve an equation for an unknown with units. I am not sure if I am having unit problems or if my way of stating variables is incorrect. I am simply just trying to solve for the variable "d" which should have units in length. How should I declare variables that rely on other known and unknown variables? When should I solve an equation symbolically and just numerically in terms of getting proper units? I am used to using maple 16 so switching to MathCAD has been fairly intiutive but I am failing to pick up on certain features. If you fix my MathCAD code, I should be able to figure it out from the fix solution. Thanks!