final UnivariateFunction f = ySplineX[j].derivative(); for (int i = 0; i < xLen; i++) { dFdX[i][j] = f.value(xval[i]); final UnivariateFunction f = xSplineY[i].derivative(); for (int j = 0; j < yLen; j++) { dFdY[i][j] = f.value(yval[j]);
final UnivariateFunction f = ySplineX[j].derivative(); for (int i = 0; i < xLen; i++) { dFdX[i][j] = f.value(xval[i]); final UnivariateFunction f = xSplineY[i].derivative(); for (int j = 0; j < yLen; j++) { dFdY[i][j] = f.value(yval[j]);
final UnivariateFunction f = ySplineX[j].derivative(); for (int i = 0; i < xLen; i++) { dFdX[i][j] = f.value(xval[i]); final UnivariateFunction f = xSplineY[i].derivative(); for (int j = 0; j < yLen; j++) { dFdY[i][j] = f.value(yval[j]);