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for( int i = 0; i < u.length; i++ ) { Vector a = u[i]; for( int j = i+1; j < u.length; j++ ) { // double val = VectorVectorMult.innerProd(a,u[j]); double val = a.innerProduct(u[j]).get(); if( !(Math.abs(val) <= tol)) return false; } }