The PLplot Plotting Library: Programmer's Reference Manual  

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plbin
: Plot a histogram from binned data
Plots a histogram consisting of
nbin
bins. The value
associated with the i'th bin is placed in
x
[i], and the number of
points in the bin is placed in
y
[i]. For proper
operation, the values in
x
[i] must form a strictly
increasing sequence. By default,
x
[i] is the lefthand edge
of the i'th bin. If
opt
=PL_BIN_CENTRED is
used, the bin boundaries are placed midway between the values in the
x
array. Also see plhist
for drawing histograms from unbinned data.

Redacted form:
General: plbin(x, y, opt)
Perl/PDL: plbin(nbin, x, y, opt)
Python: plbin(nbin, x, y, opt)
This function is not used in any examples.