» help bar

BAR Bar graph.
BAR(X,Y) draws the columns of the M-by-N matrix Y as M groups of N
vertical bars. The vector X must be monotonically increasing or
decreasing.

BAR(Y) uses the default value of X=1:M. For vector inputs, BAR(X,Y)
or BAR(Y) draws LENGTH(Y) bars. The colors are set by the colormap.

BAR(X,Y,WIDTH) or BAR(Y,WIDTH) specifies the width of the bars. Values
of WIDTH > 1, produce overlapped bars. The default value is WIDTH=0.8

BAR(...,'grouped') produces the default vertical grouped bar chart.
BAR(...,'stacked') produces a vertical stacked bar chart.
BAR(...,LINESPEC) uses the line color specified (one of 'rgbymckw').

H = BAR(...) returns a vector of patch handles.

Use SHADING FACETED to put edges on the bars. Use SHADING FLAT to
turn them off.

Examples: subplot(3,1,1), bar(rand(10,5),'stacked'), colormap(cool)
subplot(3,1,2), bar(0:.25:1,rand(5),1)
subplot(3,1,3), bar(rand(2,3),.75,'grouped')

See also HIST, PLOT, BARH.