What's wrong with Math.Matrix

[PikeBox work@x64:~]
$ cat t2.pike
void main()
{
        object s1=Math.Matrix( ({ ({ 0.001185, 0.0003731, -0.002029}),
                                ({ 0.0003731, 0.02593, 0.0258}),
                                ({ -0.002029, 0.0258, 0.03065}) }) );
        object xx0=Math.Matrix( ({ ({ -37.35, -3.449, 0.5093}) }) );
        /* [-37.35, -3.449, 0.5093]*[0.001185, 0.0003731, -0.002029;0.0003731, 0.02593, 0.0258;-0.002029, 0.0258, 0.03065] octave say =[-0.0465799  -0.0902279   0.0024090] */
        write("%O",xx0*s1);
}
[PikeBox work@x64:~]
$ pike t2.pike
Incompatible matrices.
Unknown program:
    `*(Math.Matrix( ({ ({ 0.001185, 0.0003731, -0.002029}),
                    ({ 0.0003731, 0.02593, 0.0258}),
                    ({ -0.002029, 0.0258, 0.03065}) }) ))
pike/8.0.28/lib/modules/___Math.so:1:
    Math.Matrix( ({ ({ -37.35, -3.449, 0.5093}) }) )->`*(@0=Math.Matrix( ({ ({
     0.001185, 0.0003731, -0.002029}),
                    ({ 0.0003731, 0.02593, 0.0258}),
                    ({ -0.002029, 0.0258, 0.03065}) }) ))
t2.pike:8: /main()->main()


Guo Xue Song