Mathcad

Hi all, I am trying to use Mathcad to symbolically carry out the 1st, 2nd and 3rd differentiation of a function with a stepped component. The first differential of the function yields plausible results. The first differential has the signum function. When I integrate the first differential result into my actual calculation sheet using the built in "sign" function instead of the signum function, I do get plausible results and the units are consistent.Here is the function and the first differential:However, things start getting a bit complicated with the 2nd and 3rd order differentials. Here is the 2nd order differential: As you can see, the symbolical evaluation of the second differential leads to the signum function raised to the power 2 and now I get a new DELTA function. From the help, I understand this to be the Dirac Delta function. However, I am not sure how to integrate this DELTA function into my worksheet. I understand that I have to change the DELTA to small delta (K

Hi All, Try the disappearing worksheet trick, From the help menu lsolve() is supposed to work on complex variables Solving Linear Systems•lsolve(M, v)—Returns the solution x for the linear system of equations M·x = v, using LU factorization.Arguments•M is a real or complex matrix. If the matrix is square, it must be nonsingular.•v is a real or complex vector or matrix having the same number of rows as M. See the enclosed sheet just before the crash.  put an evaluation equal sign after lsolve(A,b) and presto Prime vanishes with no warning or error.        

I have been using MathCad since the late 1980s.  I am now retired and no longer have access to Mathcad 14 which I used with my old company. I want to access some old files.  MathCad Express will not let me convert them.  Is there another way to access the files?  I had a 1990 version of Mathcad but no longer have the ability to load it on my PC.    

How do you type subscript lettering while in text mode?

Hi Masters.There are having the known series of Ipk(t), Ton(t) and Toff(t).I would like to draw a positive slope of straight-line which connects between the origin and Ipk(t) in Ton(t)and a negative slop one which connects between Ipk(t) and the end of period.     How to plot the inductor current by those series? Is the way of using coordinate series?tks    

Hello Everyone.From the following :Given :Let four contact-points of a side and incircle, excircles of a triangle are the pink point, green point, red point and blue point.Prove :Distance from the pink point to the red point = distance from the green point to the blue point . ( see figure ) Thanks in advance for your time and help.Best Regards.Loi.  

Dear forum, Basically, I am trying to analyse the forced vibration of a single span Timoshenko beam on elastic supports at both ends. I want to at the end determine the displacement w(f), rotation phi(f), shear force Q(f) and bending moment (f) at the ends of the beam due to a force excitation on one end of the beam. I want a plot of these paramaters over the excitation frequency f = 1Hz., 2Hz, 3 Hz....1000Hz. To obtain these parameters, I need to solve for a matrix system which looks like this: A.c = b. A is a 4x4 matrix for each frequency, c is a 4x1 vector for each frequency and b is a 4x1 vector for each frequency. So, based on my frequency spacing of 1Hz from 1Hz to 1000Hz, I have 1000 4x4 A matrices in the A(f) matrix, 1000 4x1 matrices in the c(f) vector and 1000 4x1 matrices in the b(f) vector. I have tried using lsolve to solve the system of equation for the c(f) vector but I keep on having an error message which says that the calculation does not converge

heyycan anyone please convert this files into mathcad prime 5? i really need this for my school and i have no other options. please help me   

I am getting error this should be scalar or matrix as I am trying to evaluate it with a number 

Again, here I am asking for help in animating a chart. I can't get a moving dot/symbol moving on the red curve. In particular, I am not able to successfully define the symbol and its movement parameters in the diagram.Kind regards, Alfred Flasshaar

Hi all, I'm somewhat new to MathCad. I'm trying to use a solve block to find a solution to several co-planar triangles that have some common sides/angles.  I've got it drawn up in CAD so I can check my calcs.   In the attached sheet, everything up to the solve block is verified.  I ended up with ten variables and ten equations.  I entered all this in a solve block (very bottom of the sheet).  I'm getting a "These units are not compatible" error.   It's possible my math is wrong or that some of my equations are redundant but before I dig into that, can anyone see any obvious error I made? Like in the syntax or units? Thanks,    

I have a wide document. Whenever, I expand an area and the tool moves the horizontal bar right to shown more of the right hand side of the document. This then hides the Area expansion buttons. How can I prevent the tool from doing this? We have documents with lots of expansion areas so this makes it difficult to navigate the worksheet since it moves about on you and requires constantly moving the horizontal bar left again to browse all the Areas.  

Hello,   MC Prime 8 file attached. Thank you.  

I have defined every variable except for Lb. I thought with it being defined as an independent variable in the function, Mathcad would understand to vary it from 0 to basically infinity. If not, how do I define Lb to work like that. Thanks.   

First, let me put my flak jacket on under my flame retardant suit...   I still have my 5-1/4" disk of Mathcad 1.0 from 1987.  I LOVE Mathcad.  It has served me well my entire career.  For a long time I have been right there with the other Mathcad 15 zealots on this forum.  I had the opportunity for a face-to-face meeting with the Mathcad product managers and developers about 10 years ago in Latham, MA and I told them across the conference table, "Until Prime can provide the basic requirements of a high school 2D plot (Title, labels, legend, readable axis, etc.), Mathcad Prime will be nothing more than a toy!".   There was palpable silence in the room, I can tell you.  Reflecting back, I was seriously angry because I could see that my beloved Mathcad was coming to an end and the only replacement for it was inadequate.   Then I waited.  Ten years.  Nothing.   I teach a corporate Mathcad course to get our engineers to use Mathcad

The writing of some formulas in Mathcad differs from the writing of these formulas in textbooks in mathematics.My students have learned to partially correct this.One example is in the picture.Three questions.1. Guess how my students do it! What is written in the hidden area.2. Show other examples of such a mismatch of operators in Mathcad and textbooks.3. What needs to be changed - Mathcad or textbooks?

The attached small system of ordinary differential equations cannot be solved, I need help. With the help of gdg solver I have had success so far. There must be a harmless error somewhere that I can't find.

I activated my license by clicking activate>configure product to use existing license> check Mathcad Prime 6.0.0.0>file:[license file path]> then they said it's done.   But then it's still saying that my program is an express version. and many functions are still locked. Is this what it's supposed to be for a student version? If not, how ca  I fix them? Thank you very much!

In MC14 I need letters from the German and non-Latin alphabet/character set (e.g. I want Sütterlin) to designate special objects/vectors. Specifically, I want to define vectors such as x(t) and e(t) this way. How can this font be implemented in MC14?Weekend greeting, Alfred Flaßhaar

Hi,I do problems that produce a square matrix in the s domain multiplied by a vector this is equal to a driver vector (circuit analysis).  I build a matrix with constants R,C,L and s as the complex frequency.  I invert this matrix and multiply by vector.  I use symbolics to generate the vector.  I then copy this result manually to a function and do my calculations in the s domain.   My problem is the copy and paste.  If I change something in the matrix (add a resistor) then it changes and I have to manually repeat the copy and paste. Is there a way to do this automatically.   I'm using 7.0 version now. Thanks for the helpAndy    

Hi all expertsHope you could do me a favor.How could i express the following series order with programing function?TksTon is the constant value and Toff(t) is variable by having different "duration" Ton, Ton+T1, Ton+T1+T2     

I am trying to plot a function in respect to a defined domain.  However, the function states that domain variable is undefined.  I do get discrete values when I remove the label for the function I do get a set of discrete values.  I feel like my issue is syntax, what am I doing wrong?    

Do you know the 1-st and 2-d ?s ? Can you calculate 3-d ? ?    

Hello,   Is it possible to do such calculation in Mathcad Prime?  

I am using Mathcad Prime 7 and I am having an issue where if I put US temperature units in the denominator of a fraction, it says the value must be a scalar or a matrix.  This does not happen with Kelvin or Rankine units.  I tried writing it different ways and that did not help either.  I tried selecting it directly from the units list as opposed to typing it in.  I tried converting the kelvin equivalent to Fahrenheit and still no luck.  Does anyone know what is going on or how to get this to work?