Hi! Breta, please direct qustions regarding CLN to the mailing list. Thanks. sopik@fzu.cz wrote:

first of all, I'd like to thank you for being interested. You're right, it wasn't very clever to ask without giving any example code. Here it is

#include <cln/complex.h> #include <cln/complex_io.h> #include <cln/float.h> #include <iostream>

using namespace std; using namespace cln; float_format_t default_float_format = float_format(40);

int main(void) { int i, N = 10; cl_N *A;

A = (cl_N*)malloc(sizeof(cl_N)*N); for(i=0; i<N; i++) { *(A+i) = complex(cl_float(i),cl_float(2)); } for(i=0; i<N; i++) { cout << *(A+i) << endl; } cout << "See, it works!" << endl; }

The understandable error message is: Unauthorized access to memory (SIGSEGV)

However I don't know, how to do things properly. Thank you for any advice.

Remember that malloc gives you a chunk of *uninitialized* memory. And inside the first loop you are assigning one cl_N to another one, but the first one does not exist yet. That results in undefined behavior. You could either read up on the C++ feature "placement new" or, better, simply use C++ standard containers instead of malloc'ed memory. Try pushing your cl_N into a std::vector<cln::cl_N>. This way, you don't have to worry about freeing your memory later. Hope this helps -rbk. -- Richard B. Kreckel <http://www.ginac.de/~kreckel/>