struct into an array

double *tr_sp_array(ParamSP *p0)
{
    ParamSP *p = (ParamSP*)malloc(sizeof(ParamSP));
    memcpy((void*)p,(void*)p0,sizeof(ParamSP));

    double *param_sp = (double*)malloc(6*sizeof(double));

    param_sp[0] = (double)p->cycle_num;
    param_sp[1] = (double)p->number;
    param_sp[2] = (double)p->ab;
    param_sp[3] = (double)p->pc;
    param_sp[4] = p->input;
    param_sp[5] = p->mass;

    free(p);

    return param_sp;
}

I don't like this code for a couple of reasons, you could avoid both malloc. I'll fork it...