old foo example

matrixfoo.c

int foo()
{
  matrix a = NULL, b = NULL, c = NULL;
  matrix_ctx ctx = NULL;

  matrix_start(ctx);

  a = matrix_new(ctx, 1000, 1000);
  b = matrix_new(ctx, 1000, 1000);

  c = matrix_assign(ctx, c, a);
  c = matrix_mult(ctx, c, matrix_unit(ctx, 2));

  c = matrix_sum(ctx, c, b);

  matrix_end(ctx);

  return some_value;
}