Fill Histogram-patch - Graphics

In article <1127072417.505498.133530@z14g2000cwz.googlegroups.com>,
SebH <bassihoude@hotmail.com> wrote:
>I would like to use gnuplot to construct histograms-i.e define bins and
>fill them. It seems not possible with the V4.0. Does it have patches
>available for the V4.0 to allow to construct such histograms?

There are patches for *drawing* them, and it is standard plotting
mode in 4.1, but what exactly do you mean by "constructing"?
Please give an example of the input data format and what you
expect to be plotted when it is read.

--
Ethan A Merritt

Ethan Merritt wrote:
> In article <1127072417.505498.133530@z14g2000cwz.googlegroups.com>,
> SebH <bassihoude@hotmail.com> wrote:
> >I would like to use gnuplot to construct histograms-i.e define bins and
> >fill them. It seems not possible with the V4.0. Does it have patches
> >available for the V4.0 to allow to construct such histograms?
>
> There are patches for *drawing* them, and it is standard plotting
> mode in 4.1, but what exactly do you mean by "constructing"?
> Please give an example of the input data format and what you
> expect to be plotted when it is read.
>
> --
> Ethan A Merritt

I acknowledge that *construct* is maybe not the right term.

What I want to do is to draw an histogram by reading a one dimension
vector filled with statistical quantities. For example, if my data
were:
{2,3,4,5,11,14,17,22,26}
I would like to separe the scale of the x-axis in a number of bins. For
example, if I the scale of the x-axis is [0,30], I would like to be
able to say that I want three bins of width 10. My histogram should
then have three boxes of width 10 where the first box would have a
height of 4, the second box-height of 3 and the third box-height of 2.

So, I want to draw a one-dimension plot....

In article <1127160995.185304.203310@o13g2000cwo.googlegroups.com>,
SebH <bassihoude@hotmail.com> wrote:
>
>I acknowledge that *construct* is maybe not the right term.
>
>What I want to do is to draw an histogram by reading a one dimension
>vector filled with statistical quantities. For example, if my data
>were:
>{2,3,4,5,11,14,17,22,26}
>I would like to separe the scale of the x-axis in a number of bins. For
>example, if I the scale of the x-axis is [0,30], I would like to be
>able to say that I want three bins of width 10. My histogram should
>then have three boxes of width 10 where the first box would have a
>height of 4, the second box-height of 3 and the third box-height of 2.

That's perfectly clear and reasonable, but unfortunately gnuplot will
not do that for you. You need an external program or script to do
the binning. I'll send you an example perl script.

--
Ethan A Merritt

Ethan Merritt <merritt@u.washington.edu> wrote:
> In article <1127160995.185304.203310@o13g2000cwo.googlegroups.com>,

> >I would like to separe the scale of the x-axis in a number of bins. For
> >example, if I the scale of the x-axis is [0,30], I would like to be

> That's perfectly clear and reasonable, but unfortunately gnuplot will
> not do that for you.

That's not completely true, I think. gnuplot can do histogram collection
on itself, at least in simple cases. The "smooth freq" option found in
version 4.0 was added explicitly for that.


plot 'data' using (int($1/10)*10)1) smooth freq

counts entries every 10 x axis units.

--
Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de)
Even if all the snow were burnt, ashes would remain.