From bug-octave-request at bevo dot che dot wisc dot edu Mon Nov 18 13:15:13 2002
Subject: Bug in plotting matrices, tracked down to bug in sprintf
From: Jean-Francois Cardoso <cardoso at tsi dot enst dot fr>
To: bug-octave at bevo dot che dot wisc dot edu
Date: Sat, 16 Nov 2002 08:39:08 -0600


Bug in plotting matrices, tracked down to bug in sprintf

The problem (already reported on octave bug list) with sprintf
truncating strings of more than 99 characters induces a bug in plot.m

I am reporting the problem here, for people wondering about weird
problems in plotting matrices.


Problem:
	
	define an 9x100 (say) matrix, like
	
		N=9 ;  Mat = ones(1,100)'*(1:N)+0.1*randn(100,N) ;  

	and try to plot the 9 columns by 

	    plot(Mat  , '-')
	    
        or by 

	    plot(Mat  , '+')


 In the first case, the rows 6, 7 and 8 are not plotted.
 In the second case, plot aborts.

 This is due to plot building too long a string of commands
 to be sent to gnuplot.

 In the first case, the truncation still produces a valid gnuplot
 command, but with missing parts.

 In the second case, truncation produces an invalid string and plot aborts.


HTH, JFC



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