Counts in each bin for 2d histogram ?

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dipak sanap
dipak sanap 2016-2-4
评论： Image Analyst 2017-12-14
I have two vectors X and Y. To construct a 2D histogram, I have to create a grid on scatter plot of X,Y. And count number of data points in each small square of the grid that will be my frequency. Can someone help me how to decide number of bins and any matlab function to count the frequency in each small square ?

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回答（1 个）

Stephen23
Stephen23 2016-2-4
Have a look at these functions:
hist3
histcounts2 Introduced in 2015b
histcn on FEX
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Steven Lord
Steven Lord 2017-12-14
If you want to see a 2-dimensional histogram plot, use histogram2 instead of histcounts2. The interfaces of those two functions are very similar, but the intent of the histcounts2 function is to let you bin the data without plotting anything. In histogram2, the ouput is the graphics object.
Image Analyst
Image Analyst 2017-12-14
histogram2() gives an object with lots of info, if you choose to accept it:
x = randn(1000,1);
y = randn(1000,1);
h = histogram2(x,y)
h =
Histogram2 with properties:
Data: [1000×2 double]
Values: [13×13 double]
NumBins: [13 13]
XBinEdges: [-3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3]
YBinEdges: [-3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3]
BinWidth: [0.5 0.5]
Normalization: 'count'
FaceColor: 'auto'
EdgeColor: [0.15 0.15 0.15]
plus more...

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