histogram

Contents: Description, Arguments, Usage, Examples, Images, Related Functions Supported Under Version: >1.69 Current Davinci Version: 2.27 64-bit Safe: No Description Generate a histogram Arguments and Return Values Arguments: An array, and histogram parameters Return Value: A 2xN array containing axis values and occurrences respectively Usage Syntax: histogram(object=VAL, [start=FLOAT], [size=FLOAT], [steps=INT], [compress=BOOL], [normalize=BOOL], [cumulative=BOOL]) The histogram function sorts its input data into some number of bins, and produces a 2xN array of FLOATs as output. The first column of the output contains the start value of each bin, and the second column contains the number of input values that fell in that bin. If the input object is in BYTE or SHORT format, the histogram will be auto-scaled to the 2^8 or 2^16 bins and each bin will have a width of 1. Otherwise, the user MUST provide at least the number of bins (steps) to be included in the histogram. If the start and size values aren't given, they are computed from the the minimum and maximum values of the input data. The compress options removes all bins with a value of 0. The normalize option divides each bin by the total number of elements. The cumulative option produces a cumulative histogram. Examples dv> a 329x7183x1 array of float, bsq format [9,452,828 bytes] dv> h=histogram(a,start=0.0002,size=.000001,steps=350) 2x350x1 array of float, bsq format [2,800 bytes] dv> xplot(h[2],Xaxis=h[1]) Images

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