AlbertoVe

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13 years, 140 days

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These are questions asked by AlbertoVe

  Dear all, I am using fsolve to solve a complex equation. When I solve it, I get the following error:

Error number of equations, 1, does not match number of variables, 2.

But the variables are just one (named u1) I think it is a problem with assume but I am getting cracy to understand the problem.You can find in attachment the short maple file. I try to solve equation e4 for variable u1.

thanks
Alberto

 Attachment:

Hi to everybody. I have to create a fortran output a lot of time for different polinomials.and CodeGeneration gives me an error. i give you a simple example to understand my problem:

restart;


  with(LinearAlgebra):


 with(CodeGeneration):


 np:=10;


 basex := Vector(np):


 for i from 1 to np do


    basex[i] := unapply(x^(i-1)-1,x);


 od:


 Fortran(basex(x),optimize,deducetypes=false,defaulttype=numeric);

Hi to everybody. Im trying to use "solve" to find the coefficient that solve a set of equations(a set of polynomials).
 

> restart;
> with(linalg):
> with(codegen):
> M:=3;
> np:=(M+1)*(M+2)/2;  

Hi to everybody, I'm computing these polinomials:

restart;
 pol:=(-1)^n/(2^n*n!)*(1 - x)^(-a) * (1 + x)^(-b) *diff((1 - x)^(a+n)* (1 + x)^(b+n),x$n);
 Lx:=unapply(pol,n,a,b);
 theta1(2) := Lx(2,0,0);

 

How can i expand the summation? i would like to have something like that:


evalf(theta1(2));
simplify(%);

I'm working with a PDE system, I want to bring it from the conservative(or divergent) to not-conservative form. So I have to do some derivatives. I'm working in vectorial form.

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