Mapping Toolbox

changem

Replace entries with certain values throughout a matrix map

Syntax

• mapout = changem(map,newcode)
  mapout = changem(map,newcode,oldcode)
  

Description

mapout = changem(map,newcode,oldcode) returns a matrix map mapout identical to the input matrix map, except that each element of map 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:

• map = magic(3)
  map =
       8     1     6
       3     5     7
       4     9     2
  

Replace instances of 8 or 9 with 0's:

• mapout = changem(ans,[0 0],[9 8])
  mapout =
       0     1     6
       3     5     7
       4     0     2
  

See Also

maskm

Mask out specified matrix map entries

            

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