## `linalg::ncols` -- number of columns of a matrix

#### Introduction

`linalg::ncols``(A)` returns the number of columns of the matrix A.

#### Call(s)

`linalg::ncols(A)`

#### Parameters

`A` | - | a matrix of a domain of category `Cat::Matrix`

#### Returns

a positive integer.

#### Related Functions

`linalg::matdim`, `linalg::nrows`, `linalg::vecdim`

#### Example 1

The matrix:

    >> A:= matrix([[1, 2, 3, 4], [3, 1, 4], [5, 6]])

                                 +-            -+
                                 |  1, 2, 3, 4  |
                                 |              |
                                 |  3, 1, 4, 0  |
                                 |              |
                                 |  5, 6, 0, 0  |
                                 +-            -+

has four columns:

    >> linalg::ncols(A)

                                         4

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