col/cols

Access one or more columns of an array. More...

array	col (int index) const
	Access column index to form column vector. More...
array	cols (int first, int last) const
	Access columns first through last to form a matrix (inclusive) More...

Detailed Description

Access one or more columns of an array.

The column indexing functions return elements located in the specified column(s).

If the array is 3-dimensional or higher, then the specified columns from all slices are returned.

Function Documentation

array col ( int  index ) const

inline

Access column index to form column vector.

float f[] = {1,2,3,4};
array a(2,2,f); //a=[1 3]
                //  [2 4]

array b = a.col(1); //b = [3]
                    //    [4]

Parameters

[in]

index

column index

Returns

Returns an array of size dims(0) x 1 x dims(2)

Note

Cannot be used in gfor. Use array(span, index, span) instead.

Examples:

examples/getting_started/integer.cpp, and examples/helloworld/helloworld.cpp.

array cols ( int  first, int  last  ) const

inline

Access columns first through last to form a matrix (inclusive)

float f[] = {1,2,3,4,5,6};
array a(2,3,f); //a=[1 3 5]
                //  [2 4 6]


array b = a.cols(0,1); //b=[1 3]
                       //  [2 4]

Parameters

[in]	first	beginning column index
[in]	last	end column index

Returns

Returns an array of size dims(0) x (last - first + 1) x dims(2)

Note

Cannot be used in gfor. Use array(span, seq(first, last), span) instead.