changem - Substitute values in data array

Syntax

mapout = changem(Z,newcode,oldcode)

Description

mapout = changem(Z,newcode,oldcode) returns a data grid mapout identical to the input data grid, except that each element of Z with a value contained in the vector oldcode is replaced by the corresponding element of the vector newcode.

oldcode is 0 (scalar) by default, in which case newcode must be scalar. Otherwise, newcode and oldcode must be the same size.

Examples

Invent a map:

A = magic(3)

A =
     8     1     6
     3     5     7
     4     9     2

Replace instances of 8 or 9 with 0s:

B = changem(A,[0 0],[9 8])
B =
     0     1     6
     3     5     7
     4     0     2

cart2grn

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