# SuanShu, a Java numerical and statistical library

com.numericalmethod.suanshu.analysis.curvefit.interpolation.bivariate

## Interface BicubicInterpolation.PartialDerivatives

• ### Method Summary

All Methods
Modifier and Type Method and Description
double dx(BivariateGrid grid, int i, int j)
Get the partial derivative $$\frac{\partial z}{\partial x}$$, at the given position in the grid.
double dxdy(BivariateGrid grid, int i, int j)
Get the cross derivative $$\frac{\partial^2 z}{\partial x \partial y}$$, at the given position in the grid.
double dy(BivariateGrid grid, int i, int j)
Get the partial derivative $$\frac{\partial z}{\partial y}$$, at the given position in the grid.
• ### Method Detail

• #### dx

double dx(BivariateGrid grid,
int i,
int j)
Get the partial derivative $$\frac{\partial z}{\partial x}$$, at the given position in the grid.
Parameters:
grid - the grid for which to get the partial derivative
i - the index along the x-axis
j - the index along the y-axis
Returns:
$$\frac{\partial z}{\partial x}$$ at the given point
• #### dy

double dy(BivariateGrid grid,
int i,
int j)
Get the partial derivative $$\frac{\partial z}{\partial y}$$, at the given position in the grid.
Parameters:
grid - the grid for which to get the partial derivative
i - the index along the x-axis
j - the index along the y-axis
Returns:
$$\frac{\partial z}{\partial y}$$ at the given point
• #### dxdy

double dxdy(BivariateGrid grid,
int i,
int j)
Get the cross derivative $$\frac{\partial^2 z}{\partial x \partial y}$$, at the given position in the grid.
Parameters:
grid - the grid for which to get the partial derivative
i - the index along the x-axis
j - the index along the y-axis
Returns:
$$\frac{\partial^2 z}{\partial x \partial y}$$ at the given point