Re: Question re function in .m file

[John B. Thoo]

Paul---

Hi.  Paul Laub suggested that I rename the function "quaderror", which  
I did.  Now there is no warning about 'function name `f' does not agree  
with function file name' when I load the file, but there are still  
errors.  Yet, I seem to be able to evaluate the function anyway.

octave:1> quaderror
error: `x' undefined near line 2 column 11
error: evaluating argument list element number 1
error: evaluating binary operator `-' near line 2, column 14
error: evaluating binary operator `-' near line 2, column 35
error: evaluating binary operator `.^' near line 2, column 50
error: evaluating assignment expression near line 2, column 3
error: called from `quaderror' in file  
`/Users/jbthoo/Documents/Work/CompletedWork/Reviews/PRIMUSreview200412/ 
quaderror.m'
octave:1> quaderror (pi / 2)
ans = 0.25000


Fewer errors when I type "quaderror (x)" in Octave, but still errors,  
yet can still evaluate the function:

octave:2> quaderror (x)
error: `x' undefined near line 2 column 12
error: evaluating argument list element number 1
octave:2> quaderror (pi / 2)
ans = 0.25000


That seems weird to me (that I can evaluate the function even with  
errors showing), and I am no less confused.

Thanks.
---John.


On Dec 14, 2004, at 6:01 PM, Paul Kienzle wrote:

> These are expected errors.
>
> When you type the function f directly into octave it
> defines the function f.  When you put it into quaderror.m
> it defines the function quaderror.m, which when loaded finds
> that it is named f and warns you.
>
> The x undefined error is because you didn't use
> quaderror(x), but instead called it without any
> arguments.  If you said 'f' on the command line
> after defining f directly on the command line you
> would have seen a similar error.
>
> - Paul
>
> On Dec 14, 2004, at 6:44 PM, John B. Thoo wrote:
>
> > Hi.  I apologize if this is a FAQ.  I put the following in a file I  
> > named "quaderror.m".
> >
> > function y = f(x)
> > y = (cos (x) - 0.5 * (sin (x)).^2 - (cos (x)).^2).^2;
> > endfunction
> >
> > But when I type "quaderror" in Octave, I get this:
> >
> > octave:9> quaderror
> > warning: near line 9, column 1:
> >
> > >>> quaderror
> >
> >
> > warning: function name `f' does not agree with function file name  
> > `/Users/jbthoo/Documents/Work/CompletedWork/Reviews/ 
> > PRIMUSreview200412/quaderror.m'
> > error: `x' undefined near line 2 column 11
> > error: evaluating argument list element number 1
> > error: evaluating binary operator `-' near line 2, column 14
> > error: evaluating binary operator `-' near line 2, column 35
> > error: evaluating binary operator `.^' near line 2, column 50
> > error: evaluating assignment expression near line 2, column 3
> > error: called from `quaderror' in file  
> > `/Users/jbthoo/Documents/Work/CompletedWork/Reviews/ 
> > PRIMUSreview200412/quaderror.m'
> >
> > I don't understand the error messages.  When I type the function  
> > directly in Octave, I do not get an error.  What am I missing?
> >
> > TIA.
> > ---John.



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