Re: [Help-gsl] Help with C++

[Germán Arias]

The only thing you need is set the seven vars (X0, X1, X2, ...):

const double x0 = gsl_vector_get (x, 0);
const double x1 = gsl_vector_get (x, 1);
const double x2 = gsl_vector_get (x, 2);
const double x3 = gsl_vector_get (x, 3);
...
const double x6 = gsl_vector_get (x, 6);

then make the seven equations:

const double y0 = 2*X0 + X1 ...
const double y1 = ...
const double y2 = ...
....
const double y6 = ...

and put the equations:

gsl_vector_set (f, 0, y0);
gsl_vector_set (f, 1, y1);
...
gsl_vector_set (f, 6, y6);


at main function you need change the size to 7:

const size_t n = 7;

put seven values:

double x_init[7] = {-10.0, -5.0, 2.5, 4, 9, 0.3, 6};

init vars:

gsl_vector_set (x, 0, x_init[0]);
gsl_vector_set (x, 1, x_init[1]);
gsl_vector_set (x, 2, x_init[2]);
gsl_vector_set (x, 3, x_init[3]);
...
gsl_vector_set (x, 6, x_init[6]);

Don't forgot that are 7 equations:

s = gsl_multiroot_fsolver_alloc (T, 7);

that is all. 

On dom, 2011-01-09 at 17:35 +0000, Mohammad Ghanim wrote:
> Dear All, 
> 
> I will appriciate if someone could help me with using the multiroot 
> findingcode of Gsl to be used for solving seven set of equations. I look at 
> the example code which is for two variable and I cannot modified for seven 
> equations.
> 
> With All the respect
> 
> 
>       
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