How do I make a histogram Question?

Niner710 has asked for the wisdom of the Perl Monks concerning the following question:

Hi, I am using Math::GSL::Histogram to do some data crunching. I want to take a group of numbers.
For example.

40 
55 
85 
48 
32
[download]

Bin Range 0-40 
Bin Range 41-60 
Bin Range 61 - 100
[download]

And I want to determine how many numbers in the list are in a certain bin range and the % distribution. Does anyone know how to do this with the Math::GSL::histogram package? I looked at the documentation but am confused as to what functions I need to do this.

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Re: How do I make a histogram Question? by zentara (Cardinal) on Jan 27, 2009 at 16:16 UTC
gnuplot histograms seems to make it easy. Do you have to use GSL? I'm not really a human, but I play one on earth Remember How Lucky You Are	[reply]
Re: How do I make a histogram Question? by JadeNB (Chaplain) on Jan 27, 2009 at 20:58 UTC
It seems from the documentation that `my $h = gsl_histogram_alloc 3; gsl_histogram_set_ranges $h, [0, 41, 61, 100], 4; gsl_histogram_increment $h, $_ for @values;` [download] will do what you like, whereupon the histogram can be printed using `gsl_histogram_fprintf` or `gsl_histogram_fscanf`. (I don't understand why `gsl_histogram_set_ranges` needs that final argument, since it can be figured automatically once `$h` is known; but the documentation says it does, and I am not in a position to test.) (Boy, gotta love those flat namespaces. I'll bet it's fun to call these functions as `Math::GSL::Histogram::gsl_histogram_xxx`.)	[reply] [d/l] [select]
Re^2: How do I make a histogram Question? by Niner710 (Sexton) on Jan 28, 2009 at 02:22 UTC
Ok, thanks for the help. I was trying to use your code and do a `gsl_histogram_fscanf($stream, $h)` What is the $stream? I read it has been opened by the gsl_fopen_function from the Math::GSL module. Does that mean it is already predefined and I don't have to define it myself. I get a compile error.	[reply] [d/l]
Re^3: How do I make a histogram Question? by JadeNB (Chaplain) on Jan 28, 2009 at 02:36 UTC
The simple answer is that you need first to run `my $stream = Math::GSL::gsl_fopen $file, $mode;` [download] The complicated answer is that `gsl_fopen` is defined in Math::GSL, which uses the `fopen` function from Math::GSL::Vector (for some reason), which is an alias of `Math::GSL::Vectorc::fopen`, whose definition I can't find—so I can't tell you anything but the obvious about `$file`, and nothing at all about `$mode`, except that it can end in `+b`. For future reference, it would have been perfectly OK to continue our discussion in the Chatterbox.	[reply] [d/l] [select]
Re^4: How do I make a histogram Question? by Niner710 (Sexton) on Jan 28, 2009 at 04:02 UTC
Re^5: How do I make a histogram Question? by syphilis (Archbishop) on Jan 28, 2009 at 07:51 UTC
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