Performance of @transect/subsasgn.m

```
At the end of @transect/subsasgn.m, we need to check if variables with status 
virtual are allowed to 
be such or not.
But the test is highly time consuming so it is not performed right now.
We need to find an efficient method to perform this test.


```

Original issue reported on code.google.com by `maze.guillaume` on 3 Jun 2010 at 2:47
