Mathcad

Hello,   "odesolve" works with A*y''(t) + B*y'(t) + 3*y(t) / (y(t)² + 1) = 0 but it doesn't work with the substitution termC(y(t)) = 3*y(t) / (y(t)² + 1)A*y''(t) + B*y'(t) + C(y(t)) = 0 I tried in several ways to define C, e.g.  C:= 3*y(t) / (y(t)² + 1); C(t, y) = 3*y(t) / (y(t)² + 1) ... etc, but in vain!I am attaching my file to this post and would appreciate your help very much !  Thank you in advance, Peter      

Greetings! My license has expired, now I´m trying to change my account because I need it for school, but I don´t now how to do it. Can someone help me please? I tried to expand my license but that didn`t work, that`s why I´m trying to change the account.

Hello, Today I made my work for Hydrodynamics. It's about this Equation:   Every Variable except h2 is calculated before and so I'm looking for h2. I have no idea how this could work, the solve function does not work.Pleas can you help me out with this Problem?Thenks a lot 😎

First of all, I extend my gratitude to all of you! @Werner_E@LucMeekes@ttokoro@Fred_Kohlhepp@terryhendicott@ValeryOchkov You people are really fantastic. I am a recent user of Mathcad and now in the learning phase. I have never seen any community being run by a handful of people. I searched, and searched a lot on different topics in Mathcad and always find satisfying answers. Apart from this, I realize that the answer was always by one of these angelic personalities. I have visited, posted in different communities but I would say that this community is above all. It has a very excellent response time. It feels these are "just post your question I can't wait more!" type people in this community always welcoming to solve the miseries of people. The second best thing is that you people are like the real guru of Mathcad. Never seen a reply "I don't understand" so far. That's amazing!   I have just one request. A three-minute video can explain something better than a thousand-word answ

Prime 7 has automatic calculation like Real Mathcad? If not, why?  

Hello everyone, I want to make a curve plot but having issues as in the attached image and Mathcad worksheet, appreciate if anyone helps.

Hello Guys!   I want to analyse my circuit, using laplace transformation.   Step 1) First I have to generate a triangle waveform. I have all informations given like peak-value, duty cycles, frequency, and so on. I could obtain a triangle waveform by defining sections with the if-equation, according to the post from Werner: https://community.ptc.com/t5/PTC-Mathcad/Plots-for-Conditional-Function/td-p/124048   My first idea was to multiply a sawtooth function with a rect function, but nevermind. I keep the solution from Werner I guess if the following Step 2) will work...   Another approach would be a fourier row to obtain the triangle shape. Maybe you have some older work / examples here for me?   Step 2-4) I want to make a Laplace Transformation from the triangle waveform, means: i(t) -> I(s)   --> is it posible with my function from Step 1) to do a laplace transformation, or do I have to go the approach with fourier rows?   (Step 3) Vout(s)=I(s)

I have an excel file that contains material property data.  I have several sheets in the file; Aluminum, Titanium, Steel etc.   Each sheet contains data for several alloys, one for each row.   In Mathcad Prime 7, I would like to be able to select a material of choice.  I thought of having a combi box that selected what type (Aluminum, Steel etc), then a 2nd combi box that would show a list of materials based on the type and allow the user to select the material from that list.  Once the user selects, I would like to load the material property data for that specific material.  It is important that once the Mathcad file is saved and closed that it retains the selections that were in the combi box.   Is this possible?  Maybe there is a better way...

Hello to the whole community !!!What to do to get the correct answer? Thank you in advance, who will answer.

I do not use symbolic evaluation very often so I am sure I am doing something wrong.  The following expression should equal mu_0 . Why do I keep getting the same thing back? Do I need a different keyword (I tried several)  or a modifier?     

please anyone help me, ive been working this mathcad all night and suddenly this file corrupted. please anyone help mee. the deadline is near:(( helpp

I'm subtracting 2 temperatures. But Mathcad gives an unexpected answer: ΔT should equal 280°F.  

I try to replicate the example from  Example: Polynomial Interpolation (ptc.com) How Ian I plot the red error bars?

I have an array, and I need to create another array, and calculate the successive average of the numbers as I move along the first array. For instance, the average of 1st & 2nd, then the average of 1st,2nd, and 3rd, etc. till end of the array   Below some more explanation, including my attempt, but I could not reach what I am looking for. I appreciate your help... Thanks    

Hi everyone, When I want to put a variable in an Excel-file, but with non standard units, for example mm instead of meters, I simply divide it in the input field (see example).  But what about a temperature? I have tried different ways but without success. It always comes out as Kelvin.  I would like Celsius °C.   Basically the question is: how do I "adimensionalize" a temperature, that is reduce the value of temperature to a simple number, without units?   Thanks a lot in advance Best regards Claudio

I am struggling with how the Combobox works and its capabilities.I created two combo boxes, and I could populate some variables using the first combo box, but I also need to be able to change the results based on a selection from the second combo boxHow can I do that?Attached is the Mathcad sheet in prime 7

I have a task to make the code in the left as written in the right but I have an error as attached appreciate if anyone can help.  

Hi all 😀 I have a data group from excel to understand: the 1st column is : Torque the 2 column is : Position the 3 column velocity: Torque   If i make a drawing with Torque (vertical Y axis)  and position (horizontal  X axis), i have this:   I see  i have periodic data : in position , approximately from 50 to 2250 milimeter. this is OK, the data relate to a cylinder which makes round trips   My problem:   How to extract data in new matrix wich include only data for one stroke: submatrix for positionning 50 to 2250 and submatrix for positionning 2250 to 50   and that for the 5 back and forth   I want to make a drawing for forth (torque and velocity) and back (torque and velocity)     Thanks

Dear Expert MathCAD Prime Users,While I am doing my assignment of Reinforcement Concrete Column Design I have a problem when I reached design axial compressive  I can not find the Value of a as you can see in my attached file in MathCAD Prime 7.0. The error message is "The function for the end points of the interval must be at opposite signs".  As I mentioned problem, I would like you to show me how to fix  this issue in order I can make a Column Interaction Diagram.I am looking forward for your help and recommend. Thank you!

There are three random points on the plane through which an arc of a parabola and a similar arc of a catenary pass. What is the probability that the length of the parabola's arc will be greater than the length of the catenary's arc??

Hello friends, I have to calculate a beam on elastic basis by the finite element method for my master thesis, I do not understand why there is an error for plotting the graph.I attached the file.Really need help because the deadline for submitting the thesis is Friday, May 28    

Hi, I don't understand what is happening here. I have a range of resistances I put into a variable. Then I just want each solution using the basic voltage divider fuctionfunction. Thank you  

Good day PTC Community!   I was wondering if someone could help me resolve my issue with the product. I tried the symbolic solve for an equation and it was amazing. I got stuck though. I was planning to use the value solved from the equation I made inside the worksheet and use it for other formulas. The problem is I can't extract it, it just prompts me "missing term or expression." Was what I'm doing wrong? or are there any workaround I should change in order to achieve extracting the variable solved?   Thanks in advance!

Hello all   From the shortcut list of Mathcad, shift+space can append an extra column to the matrix. However, I found that it doesn't work for my Mathcad Prime 7.0.   Does anyone know how to fix it?   Btw, pressing shift+enter to append an extra row to the matrix can work in my computer.       Thanks!  

Hi,   Can I use solve block inside a program loop? For example, it may be useful if I need to scan all the possible solution of Find(var1,var2,...).   Many thanks S