Sometimes datasets are provided in matrix form, with first index corresponding to longitudes ranging from 0 to 360. matrixShiftLongitude cuts such matrices at longitude=180, and swaps the pieces so that the dateline is at the left of the matrix, not in the middle.

matrixShiftLongitude(m, longitude)



The matrix to be modified.


A vector containing the longitude in the 0-360 convention. If missing, this is constructed to range from 0 to 360, with as many elements as the first index of m.


A list containing m and longitude, both rearranged as appropriate.