error example

[0xtrzy]

.gem/ruby/2.7.0/gems/numo-gnuplot-0.2.4/lib/numo/gnuplot.rb:307:in `run': (Numo::GnuplotError)
line 0: Gridding of the color column is not implemented

2d example

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how produce 2d image from array[][]

x = 3
y = 4
tab = Array.new(x) { Array.new(y,(rand(5)+1).to_s)}