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  /external/apache-commons-math/src/main/java/org/apache/commons/math/analysis/interpolation/
BicubicSplineInterpolatingFunction.java 221 public double partialDerivativeXY(double x, double y) {
273 partialDerivatives[4][i][j] = f.partialDerivativeXY();
372 private BivariateRealFunction partialDerivativeXY;
471 public BivariateRealFunction partialDerivativeXY() {
472 if (partialDerivativeXY == null) {
476 return partialDerivativeXY;
546 partialDerivativeXY = new BivariateRealFunction() {
TricubicSplineInterpolator.java 113 d2FdXdY[i][j][k] = f.partialDerivativeXY(x, y);
128 d2FdYdZ[i][j][k] = f.partialDerivativeXY(y, z);
141 d2FdZdX[i][j][k] = f.partialDerivativeXY(z, x);

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