MATLAB: Contour map from hist3()

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Contour map from hist3()?

Best Answer

Supply output variables to hist3:

 [n,c] = hist3(X, [10 10]);
 contour(c{1}, c{2}, n);

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MATLAB: How to know the bin ranges of a histogram

[counts, bincenters] = hist3(D,[40,40]);

http://www.mathworks.com/help/stats/hist3.html

"[N,C] = hist3(X,...) returns the positions of the bin centers in a 1-by-2 cell array of numeric vectors"

MATLAB: Do CONTOUR and CONTOURC produce different results in MATLAB 7.8 (R2009a)

When using CONTOUR and CONTOURC the results C1 and C2 might indeed differ:

[C1,h] = contour(peaks)
C2 = contour(peaks)

However C1 and C2 are not necessarily expected to be exactly the same. As of MATLAB 7.4 (R2009a) the CONTOUR documentation provides the following explanation:

 [C,h] = contour(...) returns a contour matrix, C, derived from the matrix returned by the low-level contourc function, and a handle, h, to a contourgroup object. clabel uses the contour matrix C to create the labels. (See descriptions of contourgroup properties.)

In this context "derived" indicates the matrices are not exactly the same, which is due to numerical precision as well as post-processing that occurs in CONTOUR. The same holds true for the sentence: "contourc calculates the contour matrix C used by contour".

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MATLAB: How to know the bin ranges of a histogram

MATLAB: Do CONTOUR and CONTOURC produce different results in MATLAB 7.8 (R2009a)

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