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Kai Gehrs


MathWorks

Active since 2011

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  • 3 Month Streak
  • Knowledgeable Level 2
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Answered
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...

9 years ago | 0

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Answered
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...

9 years ago | 0

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

10 years ago | 1

Answered
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 ...

10 years ago | 1

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Answered
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...

10 years ago | 0

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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...

10 years ago | 0

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

10 years ago | 0

Answered
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...

10 years ago | 0

Answered
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...

10 years ago | 0

Answered
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...

10 years ago | 0

Answered
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 ...

10 years ago | 0

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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...

10 years ago | 0

Answered
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...

10 years ago | 0

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Answered
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...

10 years ago | 0

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

10 years ago | 1

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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...

10 years ago | 0

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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...

10 years ago | 0

Answered
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...

10 years ago | 1

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Answered
Cholesky factorization on symbolic matrix
If you want to do the computation inside of MuPAD, you can use n:= 4: A:= matrix([[c.i.j $ i = 1..n] $ j = 1..n]): linalg...

10 years ago | 0

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