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# issquare

check if a variable is a square matrix

### Syntax

`t=issquare(x)`

### Arguments

x

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

t

a boolean

### Description

`issquare(x)` returns true if `x` is a square matrix (all dimensions of `x` are the same, with eventually singletons if `x` is an hpermatrix).

 `issquare([])` returns `%F` (false). `issquare(eye())` returns `%T` (true).

### Examples

```issquare(ones(10,10))
issquare(1)
issquare(["s" "t"; "t" "s"])
issquare(rand(2,1,2))
issquare(rand(2,2,3))
s = struct();
issquare(s) // Empty structure
clear s
s.a = %z;
s.b = 2;
issquare(s); // Scalar structure
clear s
s(1,2).a = 3;
s(1,3).b = %z;
issquare(s) // Row array of structures
clear s
s(2,1).a = "w";
s(3,1).b = %t;
issquare(s) // Column array of structures
clear s
s(1,2).a = -2;
s(3,1).b = %pi;
issquare(s) // 2D not-square array of structures
clear s
s(2,2,2).a = %f;
s(1,2,1).b = list(%e, %s);
issquare(s) // 3D (cubic) array of structures
clear s
s(2,1,2).a = 3;
s(1,1,2).b = "test";
issquare(s) // 3D array of structures (with a singleton dim)```

• isscalar — check if a variable is a scalar.
• isrow — check if a variable is a row
• iscolumn — check if a variable is a column
• ismatrix — checks if an object is a non-empty 1D or 2D matrix or array
• isempty — verifica se uma variável é uma matriz vazia ou uma lista vazia

### History

 Versão Descrição 5.5.0 Function issquare introduced.