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Re: Histograms: bar width differs

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On Sat, 02 Jul 2011 05:38:12 -0700, Felix Roth wrote:

> On 2 Jul., 11:56, Felix Roth <felix.gerhard.r...@googlemail.com> wrote:
>> Dear all,
>>
>> I am currently writing my master thesis and use gnuplot to visualize
>> the generated data. So far it has been working fine, but the bar width
>> in my histograms differs. I call gnuplot from a java program, the
>> command list looks like this:
[snip code]

Because the problem apparently is not a consequence of how gnuplot was
called, I suggest that instead of presenting the problem via java code
you should present a text file of gnuplot commands that exhibit the 
problem.  The code you show is incomplete; other people cannot easily
(if at all) replicate or diagnose your problem.

>> Out is a buffer used to communicate with gnuplot and I have to add \n
>> to each command to finish each input. The resulting plot looks like
>> this:
<http://tinypic.com/r/wivlw5/7>

>> My data file is a .csv file with following entries:
>> round,interactions,crossing interactions,execution time
>> (ms),communication cost,reassignments,overloaded peers
>> 1,5,30,194,40,0,0
>> 2,5,30,112,40,0,0
>> 3,5,30,105,40,0,0
[...]
>> 15,4,31,330,40,14,0
>>
>> Any suggestions how to fix this problem? I am completely stumped.

The problem may be due to quantization in the image file.  (Without 
running the plot it is hard to say for sure.)  The picture you
posted is 640x480, quite small.   The round-3 bars are bounded by black
lines at x-pixels 189, 193, 197, 202, 206, 210, using 21 pixels for 5 
bars.  If bars are 5.2 pixels wide, an extra pixel will get thrown in 
every so often.   Have you tried making the plots several times larger,
and then scaling appropriately for printing and viewing?  

> Update: I have replaced set xticks with set autox and strangely this
> seems to help.





-- 
jiw

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Thread

Histograms: bar width differs Felix Roth <felix.gerhard.roth@googlemail.com> - 2011-07-02 02:56 -0700
  Re: Histograms: bar width differs Felix Roth <felix.gerhard.roth@googlemail.com> - 2011-07-02 05:38 -0700
    Re: Histograms: bar width differs James Waldby <not@valid.invalid> - 2011-07-02 15:14 +0000
      Re: Histograms: bar width differs Péter Juhász <peter.juhasz83@gmail.com> - 2011-07-03 02:52 -0700

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