# define/generate new variables automatically

Dear all,

I'd like to use symbolic boxes in SAGE to check the proof of a theorem.

```
sage: var('a11, a12, a13, a21, a22, a23, a31, a32, a33');
sage: A = matrix(SR, 3, 3, [a11, a12, a13, a21, a22, a23, a31, a32, a33])
```

It is really time-consuming..

genvarname@MATLAB I can use this function with two/three for-loops to construct one symbolic matrix/tensor.

Thanks in advance!