bar
Twodimensional vertical bar plot.
bar(x)
bar(x,options)
bar(x,y)
bar(x,y, options)
Inputs 
x 
An array of real numbers. 
y 
An array of real numbers. 
options 
A set of options to control the appearance of the plot. One of the options may be specified as the
string 'stacked' or 'grouped' for stacking or grouping
multiple bars. The other option may be used to
specify the width of the plot in the form of a pair 'width', w , where
w is the width parameter, a number between 0 and 1 .

Description
If x
is a onedimensional array, bar(x)
displays vertical
rectangular bars at the points [1,2,..n]
along the xaxis, where n
is the number of elements
in x
. The height of each bar is proportional to the
magnitude of the corresponding element of x
.
If x
has m
columns, bar(x)
displays m
vertical
rectangular bars at each of the points
[1,2,..n]
where n
is the number of rows in x
.
If one of the options
is the string 'stacked'
, the bars at
each point [1,...n]
are stacked vertically one over the other
with the heights of the stacks determined by the
elements in a given row of x
.
Otherwise the bars at a given point are grouped side by side.
The distance between the bars at adjoining points on the xaxis
can be controlled by specifying the width parameter in the input
options
. If width is specified to be one, there is no gap between
the bars at various points, and if it is zero, bars are
displayed with maximum possible gaps between them. Intermediate values
of the width parameter control the width of gaps accordingly.
In the call bar(x, y)
, the height of the bars is specified by the
elements of y
, and elements of x
are used
for the locations of the bars along the xaxis. The inputs
specified in options
control the
gap size and the type of grouping of bars just as for the call bar(x)
.
Example
>>subplot(2,2,1)
>>bar(rand(4,1))
>>title("Bar Plot")
>>xtics([1 2 3 4],{"One","Two","Three","Four"});
>>subplot(2,2,2)
>>bar(rand(4,3),'grouped')
>>title("Grouped Bar Plot")
>>xtics([1 2 3 4],{"One","Two","Three","Four"});
>>subplot(2,2,3)
>>bar(rand(4,3),'stacked')
>>title("Stacked Bar Plot")
>>xtics([1 2 3 4],{"One","Two","Three","Four"});
>>subplot(2,2,4)
>>bar(rand(4,1),'width',.3)
>>title("Bar Plot with Specified Fractional Width")
>>xtics([1 2 3 4],{"One","Two","Three","Four"});