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ievgrafovievgrafov
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add example to test fit
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‎examples/plot_fit_result/gnuplot.png‎

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‎examples/plot_fit_result/gnuplot_gem.png‎

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‎examples/plot_fit_result/plot.gnuplot‎

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set term png size 600,600
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set output './gnuplot.png'
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a = 1
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b = 1
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set xrange [0:5]
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fit a*x*x + b 'points.data' using 1:2:3 zerror via a,b
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unset xrange
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plot a*x*x+b title 'Fit formula', 'points.data'
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unset output

‎examples/plot_fit_result/plot.rb‎

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require 'gnuplotrb'
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include GnuplotRB
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fit_result = fit('points.data', using: '1:2:3', function: 'a*x*x + b', initials: { a: 1, b: 1 }, term_options: { xrange: 0..5 })
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plot = Plot.new(fit_result[:formula_ds], fit_result[:data])
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plot.to_png('./gnuplot_gem.png', size: [600, 600])

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