MyMat operator()() {
MyMat res(sz,sz);
do gen.drawUniformMatrix(res,-10.0,10.0); while (res.isSingular(1e-4));
return res;
}
inline CMatrixTemplateNumeric<T> operator()() {
do gen.drawUniformMatrix(tmp,T(-3.0),T(3.0)); while (tmp.isSingular(eps));
res.multiply_AAt(tmp);
return res;
}