Mathcad

Hi all, See attached worksheet.  I took these equations out of a engineering paper and I cannot get them to work.  The find function is creating an error.   Thanks, Dan

I've added the following solution to the Rosetta Code task: Function Composition   The new Mathcad entry is at https://rosettacode.org/wiki/Function_composition#Mathcad     This would be better implemented in Mathcad 15 or full Mathcad Prime (ideally a version before PTC removed partial application) - these versions would (should) allow a cleaner and more functional version of compose.   Stuart

Hello Experts Need some help with iterating the solutions with time as a variant.  Castle 

Hello!Is there, in Mathcad, some possibility to hide the units in equation, which is presented using explicit function from Symbolic toolbar, and show unit again at result?Why Mathcad do not have such possibility to hide units in some part of equation and present them again if this is necessary for example at result? Best regards,Illimar Kalk

This non-Western font (in the red circle) has been appearing for some time in the print preview phase. Is there a way to delete it and not make others appear?I thank those who will answer me.

Together with my students, I made animation that helps to understand what a cubic spline is. One student sent me this beautiful spline  

Hi all, first post here.   I'm trying to learn a bit more of Mathcad, instead of solving problems on several lines of Excel for a finite discretization.   The problem I’m studying is a very real and common situation of cascade gas filling.   It consists of a source (infinity size for simplicity) feeding start-empty vessel (1atm) thought a regulator valve that obey a function critical or sub-critical flow rate f(Delta P), until both source and vessel pressure are equalized. Then plotting a Pressure Vs Time for that system. The pressure would ramp up (critical flow), then level horizontal to zero flow as the pressure accumulation at the end.           I want to keep the math simple, in the future to add z-factor for the gas compressibility factor.   p1=pressure source p2=pressure vessel (to be filled) T=temp (constant) V=vessel volume Cg=valve flow capacity SG=relative density MW=gas molecular mass ni=mole at P_tank empty (1 atm) nf=mole at P

How do you do the gradient of a column vector in Mathcad Prime 6 like I've done in Mathcad 15? See attached picture.    

I previously posted a version of this question, but did not get any response. So I decided to rephrase and try again.   I have been trying to compare the solvers (BDF, Radua, Stiffr and Stiffb) for stiff odes. Could be doing something stupid but BDF is the only one that I can get to run consistently. For the others I get error messages I do not understand (in this context): "The return value of this function must match the problem size" "This value must be real" (BTW. Documentation says Stiffb does not work for more than 8 equations, but it seems like it should be "8 or more". 7 worked. 8 did not.) Thanks to anyone who chimes in.  If you run the worksheet, be patient. It takes a while to calculate.   

I've added the following solution to the Rosetta Code task:  Ackermann Function   Here is the link to the solution on the Rosetta Code site:  https://rosettacode.org/wiki/Ackermann_function#Mathcad     Stuart

I need to rant about how rubbish Prime is, so I am looking at the support renewals and its coming in at like £3k for my current licenses. We only use MathCAD 15 as prime's functionality is so poor compared to MathCAD 15. So what am I paying for? I sat through a 30min webinar on Prime 5.0, the only thing that they had done was add a graphing app, I had to temper my annoyance that that was the focus for the prime 5.0 release. What about the simple stuff:- 1. Why have they changed how you do subscripts! Every time I type a variable I add a subscript, this is now a two button operation. Did the developers ever open up MathCAD 15? I have been through multiple software upgrades on AutoCAD, Solidworks, Inventor etc none of them just decide to change how the user fundamental interacts with the software. 2. Why are there no formatting styles available? Prime is there to present maths in a nice consistent format so we can deliver it to our clients, did the developers forget that the output from

I know I'm only an Express user, but could somebody at PTC please kindly consider this feature request?   The format function is potentially very useful, but (IMO) is let down by the way it converts strings, ie it includes the quote marks.   Let me present an example:   I wanted to use format to replace a section of a long string.   AsciiCow is what I wanted, FormatCow is what I got.     format would have been ideal for this job  ... except for the quotes!  On the rare occasion I might want quotes, it's easy enough to put them in the format string.     Here's an example of what I'd like from a programmed version of format I wrote many Jupiter's 9th moons ago.     Cheers,   Stuart

What I want to do is do something like this: Rate of apples on a yearly basis:        rate_apples := 2,000,000 apples/year Apples over 3 years:                          rate_apples * 3 years = 6,000,000 apples   Where it then calculates the total amount of apples for me using the unit I've defined. But it seems I can only define a new unit in terms of SI-units.   Is there any workaround or tool I don't know of?

Is there a way to search the MathCad worksheet for a variable that uses a literal subscript. I have tried cut/paste the variable into the "Find" but it does not seem to work.   Thanks.

Hi Eveyone, A nonlinear differential equation is solved using rkfixed and AdamsBDF in the attached worksheet. As can be seen on the plots, they return entirely different solutions. The stable solution is reached with rkfixed but not with AdamsBDFF within the specified time period. I wonder which function returns the correct answer. Your advice is highly appreciated. All at its best, From Payman.

Rosetta Code Task: Array Concatenation   References: 1. https://rosettacode.org/wiki/Array_concatenation2. https://rosettacode.org/wiki/Array_concatenation#Mathcad   Task: Show how to concatenate two arrays in your language. If this is as simple as array1 + array2, so be it.     Stuart

When I evaluate a range variable in a trigonometric function it works fine. But the problem comes in when I assign this trigonometric function containing the range variable to another variable. I get an error on the range variable that says, "This value must be a scalar or a matrix." The sheet is attached.

FOR A REASON OR ANOTHER THE SOLVER DOESN'T PERFORM THE INTEGRATION.   The program is typically solving for  Int [a to b]  (Ax+B)^(-3) dx.      --------However, I have several Matrices defined.-------      Initially the first matrix in the Integrand function resulted in errror : <Not a Singular Matrix.>     Thus recognizing the matrix as x, I redefined x as xn, and dxn.  Please see Theta2 equation.     I know the solution, I wish for the program to simplify future problems.

For those of you who like The Four Fours Game, I just uploaded the newest version of my document dedicated to this obsession.  It's part of this old thread I started for the previous version of the document:  https://community.ptc.com/t5/PTC-Mathcad/Lusk-Four-Fours-Game-20120125-pdf/m-p/449748

Hello everyone,When I start the print preview of a Mathcad 15 worksheet and I try to print it in pdf format, I receive this message: Is it possible to determine the character that generates the error and the non-production of the pdf file? This problem has happened to me on other occasions in the past. I ran the search excluding parts of the worksheet at each Print Preview. But it takes too much time and luck. I am looking for a faster way.Thank you very much.  

Hello everyone,When I start the print preview of a Mathcad 15 worksheet and I try to print it in pdf format, I receive this message: Is it possible to determine the character that generates the error and the non-production of the pdf file? This problem has happened to me on other occasions in the past. I ran the search excluding parts of the worksheet at each Print Preview. But it takes too much time and luck. I am looking for a faster way.Thank you very much. I finally found where the problem lies: it is made up of several lines of text with formulas inserted. What is the source of the non-production of the pdf file? I attach the file (it is a part of an appendix):   You can find it attached:

Hello folks,   I'm sure this questions has been asked many times before, but I haven't found a straight answer. Are reference tables available in Mathcad Prime 7? In Mathcad 15 the reference tables are readily (and easily) accessible and they are interactive (e.g. periodic table). I can't seem to find how to access these tables in Mathcad Prime 7. My fear is that this would be yet another functionality lost when transitioning from 15 to Prime.   Thanks in advance!!

I have a problem with ORIGIN in Mathcad Express 7.  I use the default ORIGIN at the start of a worksheet, do some calculations, then change to ORIGIN = 1, do some calculations, then change back to ORIGIN = 0 and repeat the original calculations.   However, whilst Mathcad reports that ORIGIN has changed to 1, it seems to behave as though the ORIGIN is still 1.   I don't know what I'm doing, or thinking, wrong.   The attached Mathcad Express 7 worksheet may, or may not, show the problem.    Stuart

Greetings Four Fours Game fanatics…you know who you are…(BTW, if you aren't familiar with the Four Fours Game, the attached document includes a complete description)I have been dinking around with the Four Fours Game since Algebra I in 8th grade in the early 1970s, when our teacher, the extraordinary Mr. Sherard, dropped it on us and made it a contest.  In the early 1990s, I began the process of documenting my own hand-written solutions using the Equation Editor in MS Word.  The current version, which I published two years ago to give to my math teacher friends, is still an MS Word/Equation Editor document.  The current version contains multiple solutions for every number from 1 to 300.  I am working on 301–400 as time permits.  There is one source on the internet (mentioned in my document) that has single solutions up to about 40,000 and there was no way I could directly compete with that, which is why I decided to concetrate on multiple solutions for every nu

Under Mathcad Prime 7.0 and Mathcad Express 7.0, this worksheet causes Mathcad to either lock up or to stop running (just disappears) when the first 2 "integrate" function calls (highlighted in orange) are evaluated. The 2 regions are disabled upon loading.   Enabling either region by itself and calculating the worksheet results in an expected message, "This expression cannot be evaluated.  It may have resulted in an overflow or infinite recursion.". Enabling both regions causes Mathcad to fail to respond to user input for a short, but variable period of time, before crashing.   Usually, Mathcad just disappears and is present in neither Task Manager's Process List or Details List. The regions below (in the worksheet) are an extract from a Mathcad Express 6.0 worksheet, which ran without problem under Mathcad Express 6.0.   I'm running Mathcad under Windows 10 Professional on a Lenovo T450p equipped with 16 GiB RAM.     Stuart