Plot graph with error bars.
ERRORBAR(X,Y,E) plots the graph of vector X vs. vector Y with
error bars specified by the vector E. The vectors X,Y and E must
be the same length. If X,Y, and E are matrices then each column
produces a separate line. The error bars are each drawn a distance
of E(i) above and below the points in (X,Y) so that each bar
is 2*E(i) long.
ERRORBAR(Y,E) plots Y with error bars E.
x = 1:10;
y = sin(x);
e = std(y)*ones(size(x));
draws error bars of unit standard deviation.