Re: On being Matlab

[Bill Denney]

On Wed, 1 Nov 2006, Tom Holroyd (NIH/NIMH) [E] wrote:

>   warning('off', 'MATLAB:divideByZero');
>   out = sum(tmpin, dim) ./ sum(~isnan(in),dim);
>   warning('on', 'MATLAB:divideByZero');
>
> I had them off to start with. So setting them on in his code changes 
> what I want for the rest of the code. This is just an example, one of 
> several. Is there a way to turn warnings off permanently?

What about patching warning so that it could be called like:

warning('off', 'MATLAB:divideByZero', 'freeze')

and unless it had the freeze option, it would not change the warning. 
Really though, your code should be fixed-- no global variables should have 
assumed values, and a simple change like:

function oldval = changewarn(newval, id)
  oldval = warning('query', id);
  warning(newval, id);
endfunction

and then changing your code to:

   oldwarn = changewarn('off', 'MATLAB:divideByZero');
   out = sum(tmpin, dim) ./ sum(~isnan(in),dim);
   warning(oldwarn, 'MATLAB:divideByZero');

would fix this problem (and be the right way to code it for everyone-- 
both you and the matlab users).

Bill

--
"Now you see that Evil will always triumph, because Good is dumb."
  -- Space Balls