From help-request at octave dot org Wed May 11 17:57:04 2005
Subject: Re: error() [was Re: wavread problems]
From: "Robert A. Macy" <macy at california dot com>
To: Keith Goodman <kwgoodman at gmail dot com>
Cc: help at octave dot org
Date: Wed, 11 May 2005 15:52:26 -0700

Yes,I said that, 
...but that is not what happened.

I was totally wrong.  I misinterpreted the unwind error
messages as continuing code (because of the accidental
match in line number inside the function to the line number
of my prompt!

CONCLUSION:
error() without the \n prints out more information
error() with the \n only prints out the line inside.  

seems odd, since I put the line there I know where it came
from.  

Oh well.  

sorry for the confusion.  It looks like all is well with
the function.  

                     - Robert -

On Wed, 11 May 2005 15:39:39 -0700
 Keith Goodman <kwgoodman at gmail dot com> wrote:
> So if you run the script
> 
> error('I am stopping here')
> disp('No you are not')
> error('Oh yes I am\n')
> disp('OK, you win')
> 
> you're saying that 'No you are not' and 'Oh yes I am' are
> printed? The
> output should only be 'I am stoppping here' plus a list
> of where the
> function was called from.
> 
> On 5/11/05, Robert A. Macy <macy at california dot com> wrote:
> > NOW I see what you mean.
> > 
> > I did a test inside a function to make certain the
> argument
> > was of a proper form.  All code and operations
> concerning
> > the test were valid octave operations.
> > 
> > I used to default print a line after such a test...
> > if (argument is stupid)
> >   errormsg="wrong form, idiot"
> >   return;
> > endif
> > ...doing this created a single error line and then a
> prompt
> > 
> > I now do this...
> > if (argument is stupid)
> >   error("wrong form, dolt\n";
> > endif
> > ...which prints a nice line too and then a prompt.
> > 
> > both stop the function at that test and all is well.
> > 
> > HOWEVER, when I leave out the \n; the program keeps
> trying
> > to execute and spits up later when illegal activities
> start
> > to occur.
> > 
> >             - Robert -
> > 
> > On Wed, 11 May 2005 12:28:26 -0700
> >  Keith Goodman <kwgoodman at gmail dot com> wrote:
> > > Are you sure it is attempting the code? It should
> just be
> > > unwinding
> > > the stack of functions that called the error line and
> at
> > > each one
> > > printing out the line and column numbers.
> > >
> > > I find it difficult, by the way, to visually unwind
> the
> > > error
> > > messages. Would clever formatting help?
> > >
> > > On 5/11/05, Robert A. Macy <macy at california dot com>
> wrote:
> > > > Interestingly, on 2.1.50 binary the phrase...
> > > > error("need two arguments");
> > > > ...after an if() test DOES NOT return you from the
> > > > function.  octave attempts the rest of the code.
> > > > However,...
> > > > error("need two arguments\n");
> > > > ...does return you and the rest of the code is NOT
> > > > attempted.
> > > >
> > > >             - Robert -
> > > >
> > > > On Wed, 11 May 2005 13:08:04 -0400
> > > >  "John W. Eaton" <jwe at bevo dot che dot wisc dot edu> wrote:
> > > > > On 11-May-2005, Doug Stewart wrote:
> > > > >
> > > > > BTW, you can write
> > > > >
> > > > >   error ("%s is not a WAV file", wavefile);
> > > > >
> > > > > instead of using sprintf because the error
> function
> > > > > processes
> > > > > arguments the same as printf.
> > > > >
> > > > > jwe
> > > >
> > > >
> > >
> >
>
-------------------------------------------------------------
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> GNU
> > > GPL.
> > > >
> > > > Octave's home on the web:  http://www.octave.org
> > > > How to fund new projects:
> > >  http://www.octave.org/funding.html
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> > >  http://www.octave.org/archive.html
> > > >
> > >
> >
>
-------------------------------------------------------------
> > > >
> > > >
> > 
> >



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