interp2

Vq= interp2(X,Y,V,Xq,Yq)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.XandYcontain the coordinates of the sample points.Vcontains the corresponding function values at each sample point.XqandYqcontain the coordinates of the query points.

x就是直观的x，即列数。