ta.setColumn(0, (v));
AMatrix tempA = Multiplications.multiply(A, ta);
// CommonOps.scale(c.real,v,tempB);
Matrix tb = Matrix.create(v.length(), 1);
tb.setColumn(0, v);
AMatrix tempB = tb.multiplyCopy(c.x);
// double max = NormOps.normPInf(A);
double max = normPInf(A);
if( max == 0 ) max = 1;
double error = diffNormF(tempA,tempB)/max;