Re: [Help-gsl] OT: gsl_function with pointer

[Martin Jansche]

On 10/7/06, Ivan Liu <address@hidden> wrote:

> gsl_function * Integrand=0;

You've just initialized a pointer with NULL.

> Integrand->function = &f;

Now you're dereferencing a NULL pointer.

> it compiles successfully but fails on runtime.

As it should. (This is really a general C issue, not a GSL problem.)
You need to initialize integrand to point to allocated space
{gsl_function *integrand = malloc(sizeof(gsl_function));}, or
alternatively declare it as an automatic variable with a plain
gsl_function type (see
http://www.gnu.org/software/gsl/manual/html_node/Root-Finding-Examples.html#Root-Finding-Examples
for example).

-- mj