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Interpolation for 2-D gridded data in meshgrid format

returns
interpolated values of a function of two variables at specific query
points using linear interpolation. The results always pass through
the original sampling of the function. `Vq`

= interp2(`X,Y`

,`V`

,`Xq,Yq`

)`X`

and `Y`

contain
the coordinates of the sample points. `V`

contains
the corresponding function values at each sample point. `Xq`

and `Yq`

contain
the coordinates of the query points.

also
specifies `Vq`

= interp2(___,`method`

,`extrapval`

)`extrapval`

, a scalar value that is assigned
to all queries that lie outside the domain of the sample points.

If you omit the `extrapval`

argument for queries
outside the domain of the sample points, then based on the `method`

argument `interp2`

returns
one of the following:

Extrapolated values for the

`'spline'`

and`'makima'`

methods`NaN`

values for other interpolation methods

`griddata`

| `griddedInterpolant`

| `interp1`

| `interp3`

| `interpn`

| `meshgrid`

| `scatteredInterpolant`