From help-octave-request at bevo dot che dot wisc dot edu Thu Mar 25 20:22:25 2004
Subject: Scripting question
From: "John B. Thoo" <jb2 at ms dot yuba dot cc dot ca dot us>
To: help-octave at bevo dot che dot wisc dot edu
Date: Thu, 25 Mar 2004 18:08:33 -0800

Hi.  I'm sorry if this is a faq.  I tried to RTFM, but to no avail.

I have an array of data in a file, beul.dat, that I would like to plot. 
  Typing the following, e.g.,

octave:54> plot (beul (1,:), beul (2,:))
octave:55> plot (beul (1,:), beul (3,:))

etc., works to give different plots.  But each one's a lot to type.  
So, I thought I would simplify life by writing a "for" loop:

octave:56> nframes = 10;
octave:57> x = beul (1,:);
octave:58> for i = 1:nframes
 > plotframe (i) = eval (sprintf ("plot (x, %s);", beul (i+1,:)));
 > endfor

in the hope that I could simply type "plotframe (1)", "plotframe (2)", 
etc., to get the different plots.  HOWEVER, I get the following errors:

error: octave_base_value::string_value(): wrong type argument `matrix'
error: evaluating argument list element number 1
error: evaluating assignment expression near line 59, column 15
error: evaluating for command near line 58, column 1
octave:58>

I only guessed at the syntax to use in the "for" loop based on the 
recent threads on plotting, but, to be honest, I have absolutely no 
idea what I'm doing.  Any suggestions?

TIA.
---John.



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