The PLplot Plotting Library: Programmer's Reference Manual
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plbin: Plot a histogram from binned data

plbin (nbin, x, y, opt);

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 array. Also see plhist for drawing histograms from unbinned data.

nbin (PLINT, input)

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

x (PLFLT *, input)

Pointer to array containing values associated with bins. These must form a strictly increasing sequence.

y (PLFLT *, input)

Pointer to array containing number of points in bin. This is a PLFLT (instead of PLINT) array so as to allow histograms of probabilities, etc.

opt (PLINT, 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).

Redacted form:

This function is not used in any examples.

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