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Symmetrical error bars for logarithmic Y-axis.

**errorbarlog**(X,Y,E,...) plots the graph of vector X vs. vector Y with
a logarithmic Y-axis, using symmetrical bars about the data points, ie:
the bars are such that Y is the geometric mean (instead of arithmetic
mean) of the lower and upper bars. The total length of the error bar is
2E.
**errorbarlog** has the same syntax as the original Matlab's ERRORBAR
function. The only difference is that while ERRORBAR displays the bars
symmetrically for a linear Y-axis (ie: Y is the arithmetic mean of
the lower and upper bars), **errorbarlog** displays them symmetrically
for a logarithmic Y-axis.
Example:
x=logspace(1,3,20);
y=5*(1 + 0.5*(rand(1,20)-0.5)).*x.^(-2);
**errorbarlog**(x,y,y/2,'o-');
F. Moisy
Revision: 1.01, Date: 2006/09/08

**See Also**
ERRORBAR.

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