From help-octave-request at bevo dot che dot wisc dot edu Thu Apr 24 07:15:26 2003
Subject: Re: contour changes the number of levels (string size bug)
From: "Niels L.Ellegaard" <niels at jncasr dot ac dot in>
To: help-octave at bevo dot che dot wisc dot edu
Date: Wed, 23 Apr 2003 23:26:44 -0500

Thanks for the hints about contour.m.

When I try to make a contour plot I cannot make more than 10 levels. I
have been looking in the code and I think that the problem occurs because
of a maximum string length. In order to prove this, I copied contour.m to
my home directory and removed two semicolons. Afterwards line 88 - 96
looked like this:

if (is_scalar (n))
 command = sprintf ("gset cntrparam levels %d", n);
elseif (is_vector (n))
tmp = sprintf ("%f", n(1));
for i = 2:length (n)
 tmp = sprintf ("%s, %f", tmp, n(i))  # colon is removed
endfor
 command = sprintf ("gset cntrparam levels discrete %s", tmp) # same here
endif

I tried the following

octave:1> x = y = [0:0.01:2];
octave:2> z = sin(x' * y);
octave:3> contour(x,y,z,[1:1:15])

The resulting plot contained only levels 1:10. Here is the output. Note 
that for i>10, I got tmp = 1:10,N.

tmp = 1.000000, 2.000000
tmp = 1.000000, 2.000000, 3.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000, 7.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000, 7.000000, 8.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000, 7.000000, 8.000000, 9.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000, 7.000000, 8.000000, 9.000000, 10.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000, 7.000000, 8.000000, 9.000000, 10.000000, 11.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000, 7.000000, 8.000000, 9.000000, 10.000000, 12.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000, 7.000000, 8.000000, 9.000000, 10.000000, 13.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000, 7.000000, 8.000000, 9.000000, 10.000000, 14.000000
tmp = 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000, 7.000000, 8.000000, 9.000000, 10.000000, 15.000000
command = gset cntrparam levels discrete 1.000000, 2.000000, 3.000000, 4.000000, 5.000000, 6.000000, 7.000000, 8.000000, 9.000000, 10.000000



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