Re: Was Running Beautifully, Now Not?

[Macy]

May not apply, but similar happened to me.

Completely by accident, I unknowingly used a name of a function for something 
else. In other words, obliterated the meaning used inside one of my previously 
working .m files, so that after that, and only at certain times, did I get an 
error message that made absolutely NO sense, because of the overwritten 
something.

Sadly, if you write a function, or is that overwrite a function? there is 
absolutely no check like "are you sure you want to do that? because octave 
found it already being used such and such a place" even overwrite a variable 
name will do it sometimes.

Once I almost overwrote the highly important sign() how? because I used signal 
positive as sigp and signal negative as sign, you can see the damage that can 
do!

When this overwrite occurs, the error messages then make NO sense whatever. So 
step by step down through your .m file to find exactly when the multiple occurs.

Anyway, a heads up for you.




--- address@hidden wrote:

From: Damian Harty <address@hidden>
To: "address@hidden" <address@hidden>
Subject: Was Running Beautifully, Now Not?
Date: Thu, 28 Aug 2014 17:20:55 +0000

O Learned Denizens,

A previously flawless-running M file now throws out this message when it gets 
to the printing bit:

    Error: /undefined in nan
    Operand stack:
       --nostringval--
    Execution stack:
      %interp_exit   .runexec2   --nostringval--   --nostringval--   
--nostringval--   2   %stopped_push   --nostringval--
      --nostringval--   --nostringval--   false   1   %stopped_push   1932   1  
 3   %oparray_pop   1931   1   3   %oparray_
    pop   --nostringval--   1915   1   3   %oparray_pop   1803   1   3   
%oparray_pop   --nostringval--   %errorexec_pop   .
    runexec2   --nostringval--   --nostringval--   --nostringval--   2   
%stopped_push   --nostringval--
    Dictionary stack:
       --dict:1179/1684(ro)(G)--   --dict:0/20(G)--   --dict:82/200(L)--   
--dict:40/64(L)--
    Current allocation mode is local
    Last OS error: No such file or directory
    GPL Ghostscript 9.07: Unrecoverable error, exit code 1

The script runs and does everything it is supposed to.

I tried the only thing I know, to swap the graphics toolkit from fltk to 
gnuplot, but that didn't help.

The lines in the script that generate the difficulty are

print(1,'roll_rate.jpg')
print(2,'fitted.jpg')

Without them, no messages. Obviously no files, either.

Windows 7 64 Bit, Octave 3.6.4. No known recent changes.

Given that it works, I'm not *too* worried. But it's a load of spam I don't 
want. And I want other people to use this code too, so my pride is at stake...

Damian



Damian Harty | Senior Staff Engineer, Vehicle & System Dynamics
712 CAE Group
Polaris Industries | 7290 E Viking Blvd | Wyoming | MN 55092
Tel: +1 (651) 408 6442 | Cell: +1 (651) 900 5897
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www.indianmotorcycle.com<http://www.indianmotorcycle.com/>
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