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Rebin a matrix

Syntax: | `REBIN m mout nr nc`

Suppose that matrix `m` has N rows and M columns, then:

that is, the matrix `m` will have N`/nr` rows and M`/nc` columns.

If is not equal to N, then the last row of `mout` will be incomplete. If is not equal to M, then the last column of `mout` will be incomplete.

Example

Suppose that `M` is a matrix with `8` rows and `6` columns.

command | result
`REBIN M MOUT 2 3` |
`MOUT[1,1] = M[1,1]+M[2,1]+M[1,2]+M[2,2]+M[1,3]+M[2,3]`
`MOUT[1,2] = M[1,4]+M[2,4]+M[1,5]+M[2,5]+M[1,6]+M[2,6]`
`MOUT[2,1] = M[3,1]+M[4,1]+M[3,2]+M[4,2]+M[3,3]+M[4,3]`
`MOUT[2,2] = M[3,4]+M[4,4]+M[3,5]+M[4,5]+M[3,6]+M[4,6]`
`...`

Rebin a vector