## 927 Reputation

4 years, 143 days

## @nm  dsolve convert second or...

dsolve convert second order ODE to first order ODE(to Abel).

## Without a reproducible example, we can&#...

Without a reproducible example, we can't say much.

## @reza gugheri You should copy and p...

You should copy and paste all your code and definition of U to this thread.

## Please paste copy&pastable code inst...

Please paste copy&pastable code instead of screenshots. It is not fair to the people who are trying to assist to make them need to retype all your content based on some images.

## @Stretto  Solution for Numeric Fou...

Solution for Numeric Fourier transform for sigmoid function.

For_sigmoid_function.mw

## @Stretto   Give an exampl...

My answer works for erf(x) function and if Maple can finds fourier transform symbolically, then works for general.

Give an example of a function for which a derivative can not be calculated symbolically ?

## @9009134 You can reduce steps in se...

You can decrease steps in seq command to make plots more accucurate,but the calculation time will increase.

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## @Melvin Brown  For solving &n...

For solving  PDEs use extreme powerfull pdsolve command ,will do the job for you.

## @Zeineb  Sorry Maple 2019 can'...

Sorry Maple 2019 can't find a solution, give me an errors.

Run_code_2.mw

## @Demo My solution works in Maple 20...

My solution  probably works  only in Maple 2019.

## @Zeineb  General solution for a=A,...

General solution for a=A,a=B:

General_solution.mw

## It can't be......

The short answer is that generally no, for your matrix B:=Matrix([[a, -b, e], [c, l, d], [-e, -k, m]], simplify command can't  simplify it. Mathematica also can't.

Matrix2.mw

## @Preben Alsholm  Thanks for clarif...

Thanks for clarification.

## ?...

Intial condition: D[1](T)(x, 0) = 0 it's seems to be wrong ?

If I change to D[2](T)(x, 10) = 0(I assume),pdsolve(numeric) give me: Error, (in pdsolve/numeric) unable to handle elliptic PDEs.

## Try here: https://www.mapleprimes.c...

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