Returns the matrix-coordinates of a point in a field
[i,j] = matrixcoordf(F, X, Y) returns the coordinates of the closest
matrix element corresponding to the point (X,Y) expressed in physical
units, using the spatial calibration of the field F.
Attention: Different matrix indexing conventions are used in Matlab and
PIVMat! According to the PIVMat convention, the first index I is
horizontal, and the second index J is vertical.
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