Re: Questions about eval

[John W. Eaton]

On 1/29/19 4:19 PM, Andrew Janke wrote:

> IIRC, the error happens at parse time, and eval balks at evaluating that 
> code, giving you some sort of syntax error before any of it is evaluated.

OK.?

Since assignment in Octave does produce a value, I think we would want 
to continue allowing

  x = eval ('y = 1')

to also assign a value to X.

I thought that Octave allowed both of the following

  x = eval ('y = 1; z = 2;')

  x = eval ('for i = 1:3, i, end')

to perform the evaluations, but I see that neither of these work in 
current Octave and they also fail at when parsing.  So I guess 
compatibility here is already reasonably good.

My question about what to do for

  eval (try_code, catch_code)

remains.  Does anyone have comments about that?  If not, I can open a 
bug report so that the issue is not forgotten.

jwe