Re: [Gnuplot-info] Gnuplot data file for contour plot

[Thomas S. <t.s...@fz...>]

without knowing anything about which gnuplot commands you used
it's not easy to interpret the warning.

the 'format: ...' line in the data file was written by the producer
of the data file and has nothing to do with gnuplot.

you should have a look into the gnuplot manual about the proper
layout of a data file containing a matrix.


Chelsea-11 wrote:
> 
> Hi,
> 
> I am trying to make a contour plot.  I have a 3 column matrix for the x,
> y, and
> z values.  The very first line in this matrix, however, says, 
> 
> Format: Log(10,s22th13) deltacp chi^2
> 
> The rest is a normal matrix, with the numerical values.
> I am not sure what this line is supposed to do.  This data file was
> generated
> using some sample code which I am trying to understand.  Is this line
> formatting
> the data within the file itself?  The problem is, that when I try to make
> this
> contour plot with a .gnuplot file I made, I get the error message:
> 
> warning: Axis range undefined due to improper data values.  NaN? Inf?
> 
> All points z value undefined.
> 
> I am not sure why I am getting this result.  It sounds like something is
> wrong
> with the data file and I do not know what.
> 
> So I have these two questions:
> 1) What does the Format line mean?
> 2) Why do I have this error message?
> 
> If anyone can help, it would be much appreciated.
> 
> Thanks,
> Chelsea
> 
> Here is the beginning of the data file
> 
> Format: Log(10,s22th13)   deltacp   chi^2
> -4 0 99.257424
> -4 4 95.835423
> -4 8 92.976748
> -4 12 90.669100
> -4 16 88.905463
> -4 20 87.684142
> -4 24 87.008725
> -4 28 86.887976
> -4 32 87.335670
> -4 36 88.370357
> -4 40 90.015065
> -4 44 92.296938
> -4 48 95.246815
> -4 52 98.898733
> -4 56 103.289370
> -4 60 108.457416
> -4 64 114.442873
> -4 68 121.286282
> -4 72 129.027880
> -4 76 137.706679
> -4 80 147.359479
> -4 84 158.019803
> -4 88 169.716771
> -4 92 182.473912
> -4 96 196.307917
> -4 100 211.227348
> -4 104 227.231320
> -4 108 244.308152
> -4 112 262.434026
> -4 116 281.571664
> -4 120 301.669048
> -4 124 322.658220
> -4 128 344.454189
> -4 132 366.953994
> -4 136 390.035964
> -4 140 413.559239
> -4 144 437.363598
> -4 148 461.269677
> -4 152 485.079640
> -4 156 508.578378
> -4 160 531.535313
> -4 164 553.706867
> -4 168 574.839656
> -4 172 594.674440
> -4 176 612.950829
> -4 180 629.412723
> -4 184 643.814384
> -4 188 655.927025
> -4 192 665.545696
> -4 196 672.496212
> -4 200 676.641786
> -3.96 0 92.964358
> -3.96 4 89.530667
> -3.96 8 86.652870
> -3.96 12 84.317497
> -3.96 16 82.516886
> -3.96 20 81.249204
> -3.96 24 80.518398
> -3.96 28 80.334081
> -3.96 32 80.711346
> -3.96 36 81.670523
> -3.96 40 83.236870
> -3.96 44 85.440191
> -3.96 48 88.314401
> -3.96 52 91.897010
> -3.96 56 96.228544
> -3.96 60 101.351891
> -3.96 64 107.311572
> -3.96 68 114.152933
> -3.96 72 121.921265
> 
> 
> It continues like this.  The y column or "deltacp" always runs from 0 to
> 200 in
> steps of 4 for a single value of x.
> 
> 
> 
> 
> 
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