Why does the sum of the counts delivered by hist2 not equal the number of rows in x and y?

Here is the documentation Example for hist2:

events = 1000000;
  x1 = sqrt(0.05)*randn(events,1)-0.5; x2 = sqrt(0.05)*randn(events,1)+0.5;
  y1 = sqrt(0.05)*randn(events,1)+0.5; y2 = sqrt(0.05)*randn(events,1)-0.5;
  x= [x1;x2]; y = [y1;y2];

For linearly spaced edges:

  xedges = linspace(-1,1,64); yedges = linspace(-1,1,64);
  histmat = hist2(x, y, xedges, yedges);

When I run the 6 lines of code above (not including the 'For...), I get a matrix in which the total number of counts is substantially less than the lengths of x & y (2000000)

sum(histmat(1:end))

ans =

1949700.00

[Walter Roberson]

hist2() is not part of MATLAB.

There are multiple hist2() contributions in the File Exchange; which one are you using?

[Charles Gallistel]

I did not realize that it was not a part of MATLAB. I have just looked at the code for the one I am using and it gives no version information, nor copyright, etc. I will try others.

[Charles Gallistel]

Others are more specialized and poorly documented. I will have to create my own code.