Axis labels on examples

[bryantrobbins]

It looks to me like the axis labels on your examples are backwards.

For example, from sin_wave.rb

plot.xrange "[-10:10]"
plot.title "Sin Wave Example"
plot.ylabel "x"
plot.xlabel "sin(x)"

Here, x has values -10 to 10, but is labeled "sin(x)". I see the same issue in discrete_points, multiple_data_sets, and output_image_file too.

Am I missing something?

[rdp]

does the output from running it look off as well?

[bryantrobbins]

I'm on Windows so I ran this code to save the plot:

require 'rubygems'
require 'gnuplot'

Gnuplot.open do |gp|
  Gnuplot::Plot.new( gp ) do |plot|
    plot.terminal "png"
    plot.output File.expand_path("../sin_wave.png", __FILE__)

    plot.xrange "[-10:10]"
    plot.title  "Sin Wave Example"
    plot.ylabel "x"
    plot.xlabel "sin(x)"

    plot.data << Gnuplot::DataSet.new( "sin(x)" ) do |ds|
      ds.with = "lines"
      ds.linewidth = 4
    end
  end
end

The resulting plot is here: http://www.cs.umd.edu/~brobbins/tmp/sin_wave.png

The Y axis is labeled "x" and X axis labeled "sin(x)". But the plot has sin(x) actually plotted on the Y axis and x on the X axis. This is the typical way of plotting functions in 2D, e.g. https://www.google.com/search?q=plot+of+sin(x)

So I think it's just the labels that are swapped in the code. What's crazy is that this example has been around since the older rgplot days (http://rgplot.rubyforge.org/), so I'm skeptical that I'm probably just overlooking something!

[rdp]

My guess is that the original author wanted to have "sin(x)" at the
bottom, 'cause it looks prettier LOL, but...I guess they're flipped
then aren't they? Feel free to hack up a patch for it and submit a
pull request.
-r

On Wed, Jan 4, 2012 at 11:16 AM, bryantrobbins
reply@reply.github.com
wrote:

I'm on Windows so I ran this code to save the plot:

require 'rubygems'
require 'gnuplot'

Gnuplot.open do |gp|
 Gnuplot::Plot.new( gp ) do |plot|
   plot.terminal "png"
   plot.output File.expand_path("../sin_wave.png", FILE)

   plot.xrange "[-10:10]"
   plot.title  "Sin Wave Example"
   plot.ylabel "x"
   plot.xlabel "sin(x)"

   plot.data << Gnuplot::DataSet.new( "sin(x)" ) do |ds|
     ds.with = "lines"
     ds.linewidth = 4
   end

 end
end

The resulting plot is here: http://www.cs.umd.edu/~brobbins/tmp/sin_wave.png

The Y axis is labeled "x" and X axis labeled "sin(x)". But the plot has sin(x) actually plotted on the Y axis and x on the X axis. This is the typical way of plotting functions in 2D, e.g. https://www.google.com/search?q=plot+of+sin(x)

So I think it's just the labels that are swapped in the code. What's crazy is that this example has been around since the older rgplot days (http://rgplot.rubyforge.org/), so I'm skeptical that I'm probably just overlooking something!

---

Reply to this email directly or view it on GitHub:
#9 (comment)

[rdp]

ok attempted fix: 34819ac