I am trying to export a matrix in a file using Mathematica.
I get the matrix and then use

```
Export["myfile.dat", MyMatrix, "???Format???"]

```

There are many formats. I want the one that prints the matrix in this way:

```
{{0,1,0,....},{0,0,1,...},...}

```

That is the classic Mathematica format....

How can I do this?
Which one is the correct format?