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