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Groups > comp.graphics.apps.gnuplot > #745

Wrong mean (stats) and wrong column number

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Hi!

Today I encountered a strange problem with gnuplot 4.5 patchlevel 0. I
have a file containing three colums (seperated by tabs)

Column 1: n=15
Column 2: n=15
Column 3: n=30

I calculated the mean and stdev via OpenOffice Calc for each of the
columns as well as via

stats 'MyInputFile.txt' using 1 name "A"      #1
#do some plotting
stats 'MyInputFile.txt' using 2 name "A"      #2
#do some plotting
stats 'MyInputFile.txt' using 3 name "A"      #3

First I noticed that column 1 (statement #1) has 30 records which is
strange because it only contains 15 elements.

FILE:
  Records:      30
  Out of range:  0
  Invalid:       0
  Blank:         0
  Data Blocks:   1

Second I'm puzzled, assuming the numbering starts from the back, why
mean and stdev are completely different from those computed by
OpenOffice. The only mean / stdev value that is correct is the one
from statement #2.

Any hints? I'm stuck currently ...
Thanks,
Andreas

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Wrong mean (stats) and wrong column number Andreas Heindl <andreas.heindl@gmail.com> - 2011-12-13 02:37 -0800
  Re: Wrong mean (stats) and wrong column number Péter Juhász <peter.juhasz83@gmail.com> - 2011-12-13 02:53 -0800

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