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# iscolumn

check if a variable is a column

### Syntax

`t=iscolumn(x)`

### Arguments

x

scalar,vector, matrix, hypermatrix, list, array of structures or cells

t

a boolean

### Description

`iscolumn(x)` returns true if `x` is a column vector. Scalars are considered as columns.

 Note that `iscolumn([])` returns false.

### Examples

```iscolumn(ones(10,1))
iscolumn(1)
iscolumn(["s"; "t"; "u"])
iscolumn(rand(3,1,1))
iscolumn(rand(1,1,3))
s = struct();
iscolumn(s) // Empty structure
clear s
s.a = %z;
s.b = 2;
iscolumn(s) // Scalar array of structures
clear s
s(2,1).a = "w";
s(3,1).b = %t;
iscolumn(s) // Column array of structures
clear s
s(1,2).a = -2;
s(3,1).b = %pi;
iscolumn(s) // 2D array of structures
clear s
s(1,1,2).a = 3;
s(1,1,3).b = "test";
iscolumn(s) // 3D array of structures (with 2 singleton dims)```

• isscalar — check if a variable is a scalar.
• isrow — check if a variable is a row
• ismatrix — checks if an object is a non-empty 1D or 2D matrix or array
• issquare — check if a variable is a square matrix
• isempty — check if a variable is an empty matrix or an empty list

### History

 Version Description 5.5.0 Function iscolumn introduced.