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# Kai Gehrs

### MathWorks

Active since 2011

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how can I use parameter instead of equation in dsolve
Hi Frank, you can try something like clear all; syms a x; l=a*x; dsolve(['Dx= ' char(l)]) The point is that variabl...

circa 10 anni ago | 0

| accepted

solve a differential equations system with DSOLVE
Hi Valentina, hi All, I have tried to solve the example symbolically and I also did not find a way. When entering dsol...

circa 10 anni ago | 0

| accepted

symprod error
Hi Ima, the function SYMPROD was introduced in R2011b. In addition to that the function SYMPROD is for computing products...

circa 10 anni ago | 1

system of two linear ordinary differential equations
Hi, I think the system should be solvable without any issues. Here is the MATLAB code to solve the system and to verify the ...

circa 10 anni ago | 1

| accepted

problem with psi digamma function
Hi Ali, just for the future: you may want to have a look at mfunlist in the Symbolic Math Toolbox interface in MATLA...

oltre 10 anni ago | 0

Functions
Hi Milos, I think using the Symbolic Math Toolbox is a good recommendation for the problem. Here is what I would do in M...

oltre 10 anni ago | 0

sum funtion problem
Hi, just an additional comment: you can use the function SYMSUM from the Symbolic Math Toolbox to compute closed form repres...

oltre 10 anni ago | 0

HAVE A PROBLEM WITH DSOLVE
Hi, I agree with Walter. I tried the command in R2010a and it works when you have the Symbolic Math Toolbox installed. B...

oltre 10 anni ago | 0

Let me know RootOf, X90(and X98 ... X_variable) to solve equation by using of Symbol method
Hi, the 'RootOf' is a way to encode the symbolic solutions of polynomials of higher degree for which either no symbolic closed...

oltre 10 anni ago | 0

problem with 'solve' function in matlab 2008 and upper
Hi, I agree with Walter's recommendation. I just would like to add that the results returned by solve are SYM objects and scala...

oltre 10 anni ago | 0

Change in subs() functionality from 2010b to 2011 a and b?
Hi Joseph, I have tried to run a simplified example in 10b and 11a und it does not show any errors. Here is what I have tried ...

oltre 10 anni ago | 0

matlabFunction produces file with insufficient precision?
Hi, without knowing all the details and understanding the overall problem, I would guess it could help to set up the data stri...

circa 11 anni ago | 0

error using matlabFunction : 'Error: argument must be of type 'Type:arithmetical' [cos]
Hi, just an additional comment: the names theta and beta are reserved names in MuPAD (which is the symbolic engine for the S...

circa 11 anni ago | 0

| accepted

extra variables
Hi Jason, two things come to my mind which could be helpful. First: defining P0 and afterwards using it in a character strin...

circa 11 anni ago | 0

Hi, when you have the Symbolic Toolbox with MuPAD installed, then you can just execute the command "mupad" inside the MATLAB...

circa 11 anni ago | 1

Symplifying numerical expression in Symbolic Math
Hi Chris, if you have the result inside of MuPAD and there are no symbolic variables remaining in the result, then you can j...

circa 11 anni ago | 0

how to solve symbolic function exactly?
Hi, I am not sure which result exactly you are expecting to obtain, but it seems you could specify the variables you would lik...

circa 11 anni ago | 0

How to get the coefficients of the minimal polynomial ?
Hi Palash, I think the following MATLAB function could do the job for your problem: function p = minpoly(A) p = ev...

circa 11 anni ago | 1

| accepted