of a numeric column
histogram.py $input $out_file1 $numerical_column "$title" "$xlab" $breaks $density
rpy
.. class:: infomark
**TIP:** To remove comment lines that do not begin with a *#* character, use *Text Manipulation->Remove beginning*
.. class:: infomark
**TIP:** If your data is not TAB delimited, use *Text Manipulation->Convert*
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**Syntax**
This tool computes a histogram of the numerical values in a column of a query.
- All invalid, blank and comment lines in the query are skipped. The number of skipped lines is displayed in the resulting history item.
- **Column for x axis** - only numerical columns are possible.
- **Number of breaks(bars)** - breakpoints between histogram cells. Value of '0' will determine breaks automatically.
- **Plot title** - the histogram title.
- **Label for x axis** - the label of the x axis for the histogram.
- **Include smoothed density** - if checked, the resulting graph will join the given corresponding points with line segments.
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**Example**
- Input file::
1 68 4.1
2 71 4.6
3 62 3.8
4 75 4.4
5 58 3.2
6 60 3.1
7 67 3.8
8 68 4.1
9 71 4.3
10 69 3.7
- Create a histogram on column 2 of the above dataset.
.. image:: ../static/images/histogram2.png