hist2d

MEX file to compute 2-D histogram.

[h,vx,vy] = hist2d(x,y)

or

[h,vx,vy] = hist2d(x,y,[x0 dx nx],[y0 dy ny])

Inputs:

x,y     data points.  {x(i),y(i)} is a single data point.
x0      lowest x bin's lower edge
dx      x bin width
nx      number of x bins
y0      lowest y bin's lower edge
dy      y bin width
ny      number of y bins
[x0,dx,nx] and [y0,dy,ny] default = [0,1,256]

Outputs:

h       histogram matrix.  h(i,j) = number of data points

satisfying vx(j) <= x < vx(j+1) and vy(i) <= y < vy(i+1).

vx      bin lower x-ordinates (one for each column of h)
vy      bin lower y-ordinates (one for each row of h)

Notes

• Data vectors x and y must be double

Author

Michael Maurer, 7 October 1994. Copyright 1994 by Michael Maurer.

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