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Interpolation algorithm

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From	Michael <proximum@land.ru>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Interpolation algorithm
Date	Sat, 21 Jan 2012 23:50:25 +0700
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Hello,

I have a report that contains a graph plotted with gnuplot script:

.....
.....
set pm3d at b interpolate 100,100
set cbrange[0.8*a:a]
set view map
set palette maxcolors 4
splot 'field.txt' matrix using ($1*10):($2*10):($3) with pm3d notitle

I need to describe the interpolation algorithm for this graph in report. 
Where can I find information about this algorithm?

Thanks.
Michael

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Interpolation algorithm Michael <proximum@land.ru> - 2012-01-21 23:50 +0700
  Re: Interpolation algorithm Petr Mikulik <mikulik@physics.muni.cz> - 2012-01-25 10:32 +0000

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