From bug-request at octave dot org Thu Jan 27 10:26:40 2005
Subject: "no data point found" trying to plot 2D
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: lzabaleta at fibertel dot com dot ar
Cc: bug at octave dot org
Date: Thu, 27 Jan 2005 11:30:12 -0500

On 27-Jan-2005, lzabaleta at fibertel dot com dot ar <lzabaleta@fibertel.com.ar> wrote:

| Bug report for Octave 2.1.64 configured for i686-pc-linux-gnu
| 
|   Hi, I tried the first example that appears in Octave documentation under
| the title "Plotting - Two-Dimensional Plotting" that is
| 
| 	gplot rand (100,1) with linespoints
| 
|   And I got this:
| 
| 	octave:1> gplot rand (100,1) with linespoints
| 	octave:2>
| 	gnuplot> pl '/tmp/oct-72oAwd' u 1:2 t "line 1" w linespoints
|                                                             ^
|          	line 0: no data point found in specified file
| 
|   As you can see at the prompt, this is the first command I tried. 
| 
|   As the error message is generated by gnuplot, I tried to use the same
| command 
|   in gnuplot and it failed the same until I changed the command, eliminating
| the part 
|   "u 1:2". So, the command  
| 	
| 	pl '/tmp/oct-72oAwd' t "line 1" w linespoints
|   
|   works fine!
| 
|   Any idea about this problem ?

Oops, this probably was introduced recently when I tried to fix
plotting with time formats.

Please try the following patch.

Thanks,

jwe


2005-01-27  John W. Eaton  <jwe at octave dot org>

	* pt-plot.cc (handle_plot_data): Use the correct using clause for
	2D plots with only one column of data and for non-parametric
	3D plots.


Index: pt-plot.cc
===================================================================
RCS file: /usr/local/cvsroot/octave/src/Attic/pt-plot.cc,v
retrieving revision 1.146
diff -u -r1.146 pt-plot.cc
--- pt-plot.cc	18 Oct 2004 16:27:44 -0000	1.146
+++ pt-plot.cc	27 Jan 2005 16:20:09 -0000
 at @ -760,7 +760,9 @@
 
 		      plot_buf << " '" << file << "' "
 			       << Vgnuplot_command_using
-			       << (ndim == 2 ? " 1:2" : " 1:2:3");
+			       << (ndim == 2
+				   ? (tmp_data.columns () == 2 ? " 1:2" : " 1")
+				   : (parametric_plot ? " 1:2:3" : " 1"));
 		    }
 		}
 	    }



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