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numColumns(Matrix) -- number of columns in a matrix or mutable matrix

Function: numColumns
Usage:

numColumns m
Inputs:
- m, a matrix
Outputs:
- an integer, the number of columns in m

Ways to use this method:

numColumns(Matrix) -- number of columns in a matrix or mutable matrix
numColumns(MutableMatrix)

The source of this document is in Macaulay2Doc/doc3.m2:9:0.