From: Nuralanur@...
Date: 2006-09-10T18:37:38+09:00
Subject: Ruby Gnuplot Splot problem

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Dear all,
 
I have a problem displaying three-dimensional plots using  ruby-gnuplot. 
When I execute the code attached, a window opens up and displays
axes and axes labelling, but  the actual graph does not appear.
It's not a fault of my gnuplot installation, as two-dimensional  graphs
work out.
I suspect something is wrong with the Dataset specification, 
but I don't know what.
 
Thank you in advance.
 
Best regards,
 
Axel 
 
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$verbose=nil
require "rubygems"
require "gnuplot"
include  Math
 
Gnuplot.open do |gp|
Gnuplot::SPlot.new( gp ) do |plot|

plot.ticslevel 0
plot.pm3d 'map'
plot.palette  'defined (-3 "blue", 0 "white", 1 "red")'
plot.xrange  "[-10:10]"
plot.yrange "[0:5]"
plot.zrange  "[-3:1]"

x_min=-10.0
x_max=10.0
y_min=0.0
y_max=5.0
x=[x_min]
y=[y_min]
steps=10
for k in  0...steps
x<<(x_max-x_min)/steps.to_f
end
for  k in  0...steps
y<<(y_max-y_min)/steps.to_f
end
z=[]
x.each{|x_v|
temp=[]
y.each{|y_v|
temp<<(2*sin(x_v)-1)*exp(-y_v)
}
z<<temp
} 
plot.data << Gnuplot::DataSet.new( [x,y,z] )  do |ds|
ds.with =  "pm3d"
ds.notitle
end
end
end


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