bar
===

bar histogram



Calling Sequence
~~~~~~~~~~~~~~~~


::

    bar(y)
    bar(x,y)
    bar([h],x,y [,width [,color [,style]]])




Arguments
~~~~~~~~~

:h an axes handle, (default: h=gca() ).
: :y a real scalar, vector of size N, or a matrice N*M.
: :x a real scalar or a vector of size N, (default: if y is a vector
  then x is a vector and x length equals to y length. If y is a matrix
  then x is a vector and x length equals to the lines number of y.
: :width (optional), a real scalar, defines the width (a percentage of
  the available room) for the bar (default: 0.8, i.e 80%).
: :color (optional), a string (default: 'blue'), specifying the inside
  color bar.
: :style: a string, 'grouped' or 'stacked' (default: 'grouped').
:



Description
~~~~~~~~~~~

`bar(y,...) :` if y is a vector then bar function draws a polyline
which has the `polyline_style` type 6. If y is a vector, bar draws
vector y versus vector 1:size(y,'*') . If y is a matrix N*M, bar draws
M polylines (type 6), each polyline corresponds to a column of y
versus vector x=1:size(y,1).

`bar(x,y,...) :` if y is a vector then bar function draws a polyline
which has the `polyline_style` type 6, where x length = y length.If y
is a matrix NxM then bar function draws M polylines which have the
type 6. Each polyline corresponds to a column of y versus vector x.

`bar(h,...) :` defines the current axes where the drawing is
performed.

`bar(...,width,...) :` defines the width of the bar(s) in percentage
(generally: 0<width<=1).

`bar(...,style,...) :` defines how the bar is drawn. If y is a matrix
N*M (so M polylines of type 6) then there are two ways to draw the M
bars. the style option = 'grouped' allows to center the M polylines
versus each components of x, and the style option 'stacked' allows to
stack them.

`bar(...,color,...) :`defines the bar color. Bar functions uses the
same colormap than in the `plot` function.

If there are several bar calls, the `barhomogenize` function allows to
homegenize the width and style of all bars (i.e polylines of type 6)
included in the current working axes.



Sample
~~~~~~



Examples
~~~~~~~~


::

    // First example: draw a bar (i.e a polyline with polyline_style type =6) with
    // width=0.5 and color='yellow' and default style='grouped', x=1:length(y).
    `scf`_(0);
    y=[1 -3 5];
    bar(y,0.5,'yellow');



::

    // Second example: draw 3 bars (i.e 3 polylines with polyline_style type =6),default style='grouped'
    `scf`_(1);
    x=[1 2 5];
    y=[1  -5 6;3 -2 7;4  -3 8];
    bar(x,y);



::

    // Third example : style='stacked'.
    `scf`_(2);
    x=[1 2 5];
    y=[1 4 7;2 5 8;3 6  9];
    bar(x,y,'stacked');



::

    // Fourth example: width=0.2;color='green'; default style='grouped'
    `scf`_(3);
    x=[1 2 5];
    y=[1 4 7;2 5 8;3 6 9];
    bar(x,y,0.2,'green');




See Also
~~~~~~~~


+ `barh`_ horizontal display of bar histogram
+ `barhomogenize`_ homogenize all the bars included in the current
  working axes
+ `plot`_ 2D plot
+ `polyline_properties`_ description of the Polyline entity properties


.. _plot: plot.html
.. _barhomogenize: barhomogenize.html
.. _polyline_properties: polyline_properties.html
.. _barh: barh.html