Mathcad

In Mathcad 15, after selecting a portion of an equation with the spacebar, you could hit Insert on the keyboard to toggle between inserting before or after the selection. It doesn't seem to work in Prime. Is there a way to accomplish this, or do you just have to click closer to the beginning/end before hitting the spacebar?

While working on an answer to a question here in the forum, I noticed two bugs in Prime concerning the symbolics. I could not be bothered to report them the "official" way (too complicated, I am too old to be forced to jump through that many loops) so I post them here for your information and of course for PTC staff if they really are interested to improve their software (just joking...) Both bugs are already present in Prime 6 and still are in Prime 10.   Bug #1: Simplification of an expression using "floor" and the Heaviside function returns a wrong result! BTW, the bug is due to the 'new' symbolics. When we switch back and use the legacy symbolics (only available in P6 and below) we get a correct result     Bug #2 "clear.sym" does not clear a range variable. It should make it undefined for symbolic operations. "clear" works OK, but it also makes the variable undefined for the numerics. Interestingly the operation works as it should when a second variable is added

I have a vector of data points, and I'd like to be able to selectively plot just a portion of that vector. For example, I have a vector value:=[2 3 5 8 13 21] and I want to plot just elements 2, 3, and 4. I created an index:=[2 3 4] and tried to plot value[index on the vertical axis. I've tried both the chart component and the native plotting tool, and neither worked. The only way I've figured out how to do this is to write a mathcad program to fill a third vector with just the portion that I wish to plot, then plot that third vector. That's awkward. Can you tell me what I'm doing wrong?

I have tried multiple times to download the current version of MathCAD Express, but the system has never sent the promised "installation" EMail. I have requested help from sales, but no response. I've been using MathCAD since version2 in the 1980s, but lost access to the "home use" license when I retired a few years ago. I just need MathCAD now for hobby use, with no commercial or professional usage at all. The computer that the home use version was installed on is no longer functional, so I need a copy for the new computer. Most of my hobby stuff is in MathCAD15, some is in Prime 5-8. I am in your system as PJR51@live.com, formerly Paul.Rebstock@NRC.gov. The live.com account is still active, the NRC.gov account was closed when I retired. My cell phone is 240-393-3704.How can I get the current version? Can I install it on both my laptop and my Microsoft Surface?

Whilst writing a string replace function for Mathcad Express, I found what seems to be a problem with the string function search.   I wanted to check a string for the existence of the Unicode characters for 11 (↊) and 12 (↋) in the duodecimal system ... and it found them everywhere even when they weren't there at all.   Has this been noticed before?  Have I made some kind of error or unwitting assumption?     Cheers,   Stuart   (The simple recursive algorithm shown above is O(n) and only good for strings shorter than about 4000 characters (ie, under Mathcad's recursion depth limit.   A slightly more complicated algorithm would use a binary-division algorithm to reduce the recursion stack to O(log n), which will handle much longer strings)

If there is a way to display the values of variables inside a block in mathcad 15?

This file is in MathCAD 9, but I'm experiencing the same issue in MathCAD 10. I believe MathCAD is misrepresenting the units. See attached. "Hmp" and "TH" have the wrong values when comparing with example 11.2 at the bottom. I rewrote them as H and T next to them. I substituted "m" and "Ump" for the actual values of 100000 and 1035 and the answers came out correct. So, something is wrong with how "m" and "Ump" are represented.

Hi,Can anybody solve equation ? Solution is x =1, but Mathcad doesn't see this solution ...  

I'm trying to pass on a variable as a string to another mathcad Prime sheet.  VAY is a number defined above in calculations within the sheet.  I don't want the evaluated value but the variable itself.  There should be a function to do just that.  See screen shot.

I had to change to a new Computer because of updating to Windows 11. Content drive C: has been cloned. It is not possible to get the license again. Mathcad cannot be used. What can I do?

Hello PTC community,   Im contacting you regarding a reoccurring issue we've encountered with a license on a specific Host,   Since 25.08.2025 we installed Mathcad License(Prime 6 which is compatible with MathCAD 15) Locked version on our host.    The license activates the software and works as intended for couple of days, after that it's getting deactivated and has to be activated again (Activated 3 times already). We've followed the procedure as shown in PTC Knowledge Base and it has worked successfully on multiple other hosts. Only on this case we encountered this issue.   Kindly advise how to proceed & let us know if more information is needed.   Best regards

I have an old copy of Mathcad 15 and Prime3.0 installed on a Windows 10 computer which was purchased 2/8/2014 . I need Windows 11 licenses for both as I purchased a new computer.

I am using Mathcad Prime Release 10.0 and Datecode10.0.0.0My company uses Python scripts to extract Mathcad Prime data to Excel spreadsheets. The Python code uses the MathcadPy library to extract data to the spreadsheets, but I am continually getting errors when running the code. I have also seen the error popup when running Mathcad Prime normally.We create a folder structure of Mathcad Prime files, using relative links to point to the folder/file at the next level up. We have a number of Mathcad sheets in the same folder and they all point to Mathcad files at the directory above , to make a make-shift library of electrical parts/parameters for our application.I will randomly see the error pop-up when accessing these files. It is also random, and there is no predictability to the error popping up.Here are the errors that I faced"An unhandled exception occured. See .log file"Exception data:System.Exception: Lisp applying: CallNodeCallback {global} to Engine.NodeCallback, 1419, NODE_READ

Hello All, I have attached P10 sheet and an Excel sheet I am reading from. Many thanks to Werner and Stuart for helping me get this far. On page 12 of the Mathcad sheet, you’ll see the results of the axial forces and moments imported from the attached Excel file. On page 13, I’ve listed a couple of questions I need help with:1 How do I extract from the [TC axial Comp] forces of the panel forces (e.g. TC1, TC2, TC3, TC4, .... ) and place them into a vector labeled TC.Panel.Axial.Compr?2. How can I extract the [TC axial Comp] forces at panel points (TPP#), such as TPP3, TPP5, TPP7, TPP9, … and place them into a vector labeled TC.PP.Axial.Compr? Regards,Sam 

i have been a long time user of MathCad, strongly prefer the old, non prime versions.  Thinking of trying Prime once again, in case MathCAD 15 no longer can be made to work.  When to activate a newly downloaded, properly assigned locked licence, Prime does not seem to have an activated licence.  For example the watermark is there, the activate button is live, and not all functionality is available.  I'm not sure what to try next.  I've verified the MAC ID, downloaded new licence files a few times, tried on Windows 10 and windows 11 PC (of course properly assigning the MAC is in licence manager).  I also opened a ticket for support, that I have paid for for years and years and years, and have enjoyed no reply so far (about a week of waiting). Any tips?

Hello All, I have been manually inputting values from an Excel file into a table in Mathcad P10 sheet. I have attached both files. Is it possible to automate this process? I am interested in getting the values I highlighted in yellow in the excel sheet. Regards,Sam 

New to this Mathcad Prime here. Version 10.0.  I converted a sheet from Mathcad 15, In the converted sheet, every time I change the inputs I get question marks on the outputs and have to go back and manually type the uints over again. Is this a bug or can I solve this somehow. Thanks.

Could anyone suggest how I can setup a function within Mathcad to resolve the attached expression where I am looking to find theta? 

Are you frustrated with limited functionality when you use PTC Mathcad Express? Watch this on-demand 60-minute in-depth session made just for Mathcad Express users on how to get the maximum benefit from the PTC Mathcad experience.   Also, we have a new Mathcad worksheet available for download that gives an in-depth comparison between Express's capabilities and Mathcad Prime's capabilities. It was ghost-written by popular Mathcad author Brent Maxfield, so Mathcad Express users will learn a lot about what they're missing by not upgrading to Prime.

Over 2 decades ago, I had a need to document technical analyses.  After some research, I discovered Mathcad V3 (?).  It worked with Windows 3 (or 3.1).  I was ecstatic that Mathcad served my specific needs!  Over the years, there were somewhat regular updates.  As had been mentioned in other posts, Mathcad originally used the Maple Symbolic engine and then moved away from it.  That was not a problem as I purchased a Maple license to fill in the gap.The above arrangement worked for me until PTC no longer supported Mathcad 15.  It served my purposes for many years, so I decided to try Mathcad PRIME.  It was an early version and it would not serve my purposes.  However, I kept track of it and it became obvious that PTC was serious about developing PRIME's capabilities.  I have had the opportunity to work with PTC PRIME 10 (and soon, V11) at my workplace.  I am pleased with the capabilities and considered purchasing a personal license.

I have Mathcad 14, working fine till now. I was bound to reinstall the PC, but now I get error in licensing the mathcad 14. "Unexpected Error. The remote server returned an error: (403) Forbidden."I did not get any time limit when I bought Mathcad 14, so I should be able to continue using it. It is only for occassional private (academic) use.

Hello, I have attached the Excel and P10 sheet. I'd like to read data from the second tab of the Excel sheet. The P10 sheet can read from the first tab of the sheet, but not the second tab. I don't know why.  Also, I am interested in reading the values in several columns. Is it better to do one column at time, or there are other options? Stuart and Werner helped me with a similar question on 8/29/20225. Thank you for your assistance!  Regards,Sam 

HelloI have issues with matrix calcualtions.  I am calculating the stifness matrix of something but I want to multipy a matrix by a vector. But I want to put unknown variable in the vector so the resulting vector is a function of the variable. I am ataching pictures to illustrate what  I mean. Thanks for any help.

Sources: https://github.com/ViacheslavMezentsev/NetEFI[26-06-2014]- only for 32-bit systems;- mc15 & mp3 supported (mp3 can't get string value for now);- only .net 2.0 supported;- examples for vs2008.

Say, if I want to define the expression of Euler's formula below in Mathcad, how should I finish the input for that?