I installed gnuplot gem, and I am getting some syntax errors when I try to
run the samples on the projects web page.
ruby test.rb
c:/programs/ruby/lib/ruby/gems/1.8/gems/gnuplot-2.1/lib/gnuplot.rb:20:in
`popen': No such file or directory - which gnuplot (Errno::ENOENT)
from
c:/programs/ruby/lib/ruby/gems/1.8/gems/gnuplot-2.1/lib/gnuplot.rb:20:in
`open'
from test.rb:2
Exit code: 1
my test code is copied directly from the gnuplot ruby project web page
except the added require 'gnuplot' which is not mentioned in the example. I
think I am missing something simple here.
require 'gnuplot'
Gnuplot.open do |gp|
Gnuplot::Plot.new( gp ) do |plot|
plot.title "Array Plot Example"
plot.ylabel "x"
plot.xlabel "x^2"
x = (0..50).collect { |v| v.to_f }
y = x.collect { |v| v ** 2 }
plot.data << Gnuplot::DataSet.new( [x, y] ) do |ds|
ds.with = "linespoints"
ds.notitle
end
end
end
I installed gnuplot gem, and I am getting some syntax errors when I try to
run the samples on the projects web page.
ruby test.rb
c:/programs/ruby/lib/ruby/gems/1.8/gems/gnuplot-2.1/lib/gnuplot.rb:20:in
`popen': No such file or directory - which gnuplot (Errno::ENOENT)
from
--
email :: ara [dot] t [dot] howard [at] noaa [dot] gov
phone :: 303.497.6469
anything that contradicts experience and logic should be abandoned.
-- h.h. the 14th dalai lama
> I installed gnuplot gem, and I am getting some syntax errors when I try to
> run the samples on the projects web page.
>
>> ruby test.rb
> c:/programs/ruby/lib/ruby/gems/1.8/gems/gnuplot-2.1/lib/gnuplot.rb:20:in
> `popen': No such file or directory - which gnuplot (Errno::ENOENT)
> from
it looks like the code must do
IO::popen `which gnuplot`
so either
- gnuplot is not on your system
- gnuplot is not in your path
can you verify both of these? from the shell do
~:> which -a gnuplot
Ara is completely correct with his diagnosis. You have two choices,
either ensure that gnuplot is in your path or hardcode the path in the
gnuplot.rb file. I've struggled for a number of years on how to
improvie this but haven't been able to come up with something better
that satisfies my sense of right and wrong. Suggestions would be
appreciated.
<gordon.j.miller@gmail.com> wrote in message
news:1129898636.033794.322130@z14g2000cwz.googlegroups.com...
Ara.T.Howard wrote:
> I installed gnuplot gem, and I am getting some syntax errors when I try
> to
> run the samples on the projects web page.
>
>> ruby test.rb
> c:/programs/ruby/lib/ruby/gems/1.8/gems/gnuplot-2.1/lib/gnuplot.rb:20:in
> `popen': No such file or directory - which gnuplot (Errno::ENOENT)
> from
it looks like the code must do
IO::popen `which gnuplot`
so either
- gnuplot is not on your system
- gnuplot is not in your path
can you verify both of these? from the shell do
~:> which -a gnuplot
Ara is completely correct with his diagnosis. You have two choices,
either ensure that gnuplot is in your path or hardcode the path in the
gnuplot.rb file. I've struggled for a number of years on how to
improvie this but haven't been able to come up with something better
that satisfies my sense of right and wrong. Suggestions would be
appreciated.
Gordon
Aha! I see it now. The problem isn't that gnuplot isn't in the path, but
that 'which' is not a standard command on windows XP.
I guess not many people have tried running this under windows.
gordon, It looks like the gnuplot executable on windows needs to be
pgnuplot.exe. Might I suggest that when on windows you set cmd = "pgnuplot"
and assume it is in the path. I don't know the ruby way to check for
platform, perhaps ENV["OS"].downcase.include?("win") or some such hack.
<gordon.j.miller@gmail.com> wrote in message
news:1129898636.033794.322130@z14g2000cwz.googlegroups.com...
···
Ara.T.Howard wrote:
On Fri, 21 Oct 2005, soxinbox wrote:
> I installed gnuplot gem, and I am getting some syntax errors when I try
> to
> run the samples on the projects web page.
>
>> ruby test.rb
> c:/programs/ruby/lib/ruby/gems/1.8/gems/gnuplot-2.1/lib/gnuplot.rb:20:in
> `popen': No such file or directory - which gnuplot (Errno::ENOENT)
> from
it looks like the code must do
IO::popen `which gnuplot`
so either
- gnuplot is not on your system
- gnuplot is not in your path
can you verify both of these? from the shell do
~:> which -a gnuplot
Ara is completely correct with his diagnosis. You have two choices,
either ensure that gnuplot is in your path or hardcode the path in the
gnuplot.rb file. I've struggled for a number of years on how to
improvie this but haven't been able to come up with something better
that satisfies my sense of right and wrong. Suggestions would be
appreciated.
def which bin
path = ENV['PATH'] # || ENV['WHAT_EVER_WINDOWS_PATH_VAR_IS']
path.split(File::PATH_SEPARATOR).each do |dir|
candidate = File::join dir, bin
return candidate if File::executable? candidate
end
return nil
end
gnuplot = ENV['RB_GNUPLOT'] || 'gnuplot'
gnuplot = which gnuplot or raise 'gnuplot is not in your path'
or, if windows isn't a concern
gnuplot = `which gnuplot`
raise 'gnuplot not in your path' unless $? == 0
IO::popen gnuplot
thanks for the good work on gnuplot btw - i've used in many times.
cheers.
-a
···
On Fri, 21 Oct 2005, gordon.j.miller@gmail.com wrote:
Ara.T.Howard wrote:
On Fri, 21 Oct 2005, soxinbox wrote:
I installed gnuplot gem, and I am getting some syntax errors when I try to
run the samples on the projects web page.
ruby test.rb
c:/programs/ruby/lib/ruby/gems/1.8/gems/gnuplot-2.1/lib/gnuplot.rb:20:in
`popen': No such file or directory - which gnuplot (Errno::ENOENT)
from
it looks like the code must do
IO::popen `which gnuplot`
so either
- gnuplot is not on your system
- gnuplot is not in your path
can you verify both of these? from the shell do
~:> which -a gnuplot
Ara is completely correct with his diagnosis. You have two choices, either
ensure that gnuplot is in your path or hardcode the path in the gnuplot.rb
file. I've struggled for a number of years on how to improvie this but
haven't been able to come up with something better that satisfies my sense
of right and wrong. Suggestions would be appreciated.
--
email :: ara [dot] t [dot] howard [at] noaa [dot] gov
phone :: 303.497.6469
anything that contradicts experience and logic should be abandoned.
-- h.h. the 14th dalai lama
You will have to add something to change the search to look for pgnuplot.exe
as there is no gnuplot.exe on windows. I have just started using this, but I
agree it looks cool. I hope to use it to output some technical graphs.
Thanks to those that created gnuplot and the ruby adaptation layer.
"Ara.T.Howard" <Ara.T.Howard@noaa.gov> wrote in message
news:Pine.LNX.4.62.0510210836070.30900@harp.ngdc.noaa.gov...
···
On Fri, 21 Oct 2005, gordon.j.miller@gmail.com wrote:
Ara.T.Howard wrote:
On Fri, 21 Oct 2005, soxinbox wrote:
I installed gnuplot gem, and I am getting some syntax errors when I try
to
run the samples on the projects web page.
ruby test.rb
c:/programs/ruby/lib/ruby/gems/1.8/gems/gnuplot-2.1/lib/gnuplot.rb:20:in
`popen': No such file or directory - which gnuplot (Errno::ENOENT)
from
it looks like the code must do
IO::popen `which gnuplot`
so either
- gnuplot is not on your system
- gnuplot is not in your path
can you verify both of these? from the shell do
~:> which -a gnuplot
Ara is completely correct with his diagnosis. You have two choices,
either
ensure that gnuplot is in your path or hardcode the path in the
gnuplot.rb
file. I've struggled for a number of years on how to improvie this but
haven't been able to come up with something better that satisfies my
sense
of right and wrong. Suggestions would be appreciated.
maybe somthing like (un-tested):
def which bin
path = ENV['PATH'] # || ENV['WHAT_EVER_WINDOWS_PATH_VAR_IS']
path.split(File::PATH_SEPARATOR).each do |dir|
candidate = File::join dir, bin
return candidate if File::executable? candidate
end
return nil
end
gnuplot = ENV['RB_GNUPLOT'] || 'gnuplot'
gnuplot = which gnuplot or raise 'gnuplot is not in your path'
or, if windows isn't a concern
gnuplot = `which gnuplot`
raise 'gnuplot not in your path' unless $? == 0
IO::popen gnuplot
thanks for the good work on gnuplot btw - i've used in many times.
cheers.
-a
--
> email :: ara [dot] t [dot] howard [at] noaa [dot] gov
> phone :: 303.497.6469
> anything that contradicts experience and logic should be abandoned.
> -- h.h. the 14th dalai lama
Another FYI, I have found that under windows, the gnuplot from cygwin
is actually better than the native pgnuplot, for handling piped input
(and cygwin will also fix the missing which issue).
While we are on the topic off rgnuplot, does anybody know if it is possible to still "turn" 3d graphs when called from ruby. If I make a graph directly in gnuplot I can spin it around with the mouse to look at it from different sides. With rgnuplot that doesn't seem possible.
I'm not too familiar with the interactive gnuplot capabilities (I
stepped out of gnuplot development around this time and don't really
care about the interactive part). When the plot window is up it is
being executed from within gnuplot so it should respond the exact same
as it would interactively.