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Scilab help >> Matlab to Scilab Conversion Tips > Matlab-Scilab equivalents > O > ones (Matlab function)

# ones (Matlab function)

Create an array of all ones

### Matlab/Scilab equivalent

 Matlab Scilab `ones` `ones`

### Particular cases

Note that in Matlab, A can contain complex values (in these cases, only real part of A is taken in account), what Scilab function do not tolerate.

```// Scilab version
B=ones(A)```

Most differences stem from the use of ones in conjunction with size. In Scilab you do not need to use size:

```% Matlab version
A = [1 2; 3 4];
B = ones(size(A))
B  = [ 1. 1. ; 1. 1.]```
```// Scilab version
A = [1 2; 3 4];
B = ones(A)
B  =[ 1 1; 1 1]```

As a result, if A is a scalar, then Matlab will return a A*A matrix of ones but in Scilab you get a 1 (just because a scalar is a 1*1 matrix), so use ones(A,A) to get the same matrix B. If A is a vector, Scilab and Matlab give the same B. Finally, if A is a matrix, in Scilab, B will be a matrix having the same size as A whereas in Matlab, you get an error message.

### Examples

 Matlab Scilab ```B = ones(2) B = [1,1;1,1] B = ones(2,2) B = [1,1;1,1] B = ones([3,3]) B = [1,1,1;1,1,1;1,1,1]``` ```B = ones(2) B = 1 B = ones(2,2) B = [1,1;1,1] B = ones([3,3]) B = [1,1]```