Young - 2016-07-27

Hi,

I am plotting contour using 2D unstructured grid data. I finally get contour plot that I want, except the grid data in the boundary of s and y range.

http://s1039.photobucket.com/user/z20112744/slideshow/gnuplot

With whole range, there is no issue at all, but when I reduced the x and y range(zoom in), I have got the problem like above figure.
Data is not shown, but just white.

What I do for this is below.

set style data pm3d
set pm3d map interpolate 1,1

set contour base
set cntrparam level increment 0.0,0.2,2.0

set palette rgbformulae 33,13,10
set size square
unset key

set grid
r = 1.8
set xrange [-r:r]
set yrange [-r:r]
set cbrange [0:2]
set cbtics 0,0.25,2
set xlabel "x"
set ylabel "y"

splot "Grid1.dat" u 1:2:3

Would you give me some advice for me?

Thank you

Young.