Re^2: Newbie using modules

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Re^3: Newbie using modules by Corion (Patriarch) on Oct 05, 2008 at 19:52 UTC
It seems that the synopsis of the module is incomplete. From reading the documentation further down, there is a `->output($filename)` method which writes the chart as an image file to disk. So maybe you have to add another line after the `->plot2d`: `... $chart->output('mychart.png');` [download]	[reply] [d/l] [select]
Re^4: Newbie using modules by moritz (Cardinal) on Oct 05, 2008 at 20:03 UTC
I tried version 0.05, and the `new(output => $out_file)` works just fine, and produces the desired output file.	[reply] [d/l]
Re^3: Newbie using modules by moritz (Cardinal) on Oct 05, 2008 at 19:54 UTC
... and `ls` doesn't show a `expression.png` file? (The desktop view might not be updated immediately, so use ls to check). I tried your script (with a different path, of course), and it worked, and with a wrong output path (ie non-existing path) an error message is shown. If you are sure that the file is not created, you might try to run your script with `strace` to find out if a system call failed: `strace -f perl myscript.pl` [download] (Update: If you don't know how to read the output from strace, post the last 30 to 50 lines here (in `<readmore><code>...</code></readmore>` tags), maybe somebody can enlighten you).	[reply] [d/l] [select]
Re^3: Newbie using modules by Anonymous Monk on Oct 06, 2008 at 13:47 UTC
Please check the following: Type `gnuplot --version` to check whether gnuplot can be executed. Check whether the directory `/tmp` is already full. Check whether you have write permission of `/tmp`. If they are all fine, then you should be able to use at least the basic features of `Chart::Gnuplot`. Please re-try your original script with `expression.ps` as output instead (ps format is more basic than png for the module). You don't need the method `->output($filename)` although there is no harm to do so. The `output` method is useful only in cases where you don't know the output filename yet when you create the chart object. If you got `expression.ps`, then it may be the problem of ImageMagick. Please check whether it is installed. If you don't want to install ImageMagick and if you want to generate png file. You may try: `my $chart = Chart::Gnuplot->new( output => "/home/diffredential/Desktop/expression.png", terminal => "png" );` [download]	[reply] [d/l] [select]