# plbin.3plplot - Man Page

Plot a histogram from binned data

## Synopsis

plbin(nbin, x, y, opt)

## Description

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 left-hand 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 vector.  Also see plhist(3plplot) for drawing histograms from unbinned data.

Redacted form: General: plbin(x, y, opt) Python: plbin(nbin, x, y, opt)

This function is not used in any examples.

## Arguments

nbin (PLINT(3plplot), input)

Number of bins (i.e., number of values in x and y vectors.)

x (PLFLT_VECTOR(3plplot), input)

A vector containing values associated with bins.  These must form a strictly increasing sequence.

y (PLFLT_VECTOR(3plplot), input)

A vector containing a number which is proportional to the number of points in each bin.  This is a PLFLT (instead of PLINT) vector so as to allow histograms of probabilities, etc.

opt (PLINT(3plplot), input)

Is a combination of several flags: opt=PL_BIN_DEFAULT: The x represent the lower bin boundaries, the outer bins are expanded to fill up the entire x-axis and bins of zero height are simply drawn. opt=PL_BIN_CENTRED|...: The bin boundaries are to be midway between the x values. If the values in x are equally spaced, the values are the center values of the bins. opt=PL_BIN_NOEXPAND|...: The outer bins are drawn with equal size as the ones inside. opt=PL_BIN_NOEMPTY|...: Bins with zero height are not drawn (there is a gap for such bins).

## Authors

Many developers (who are credited at http://plplot.org/credits.php) have contributed to PLplot over its long history.