How to bin for scatter plot from two data series?

Question

trailokya 2015-9-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/243174-how-to-bin-for-scatter-plot-from-two-data-series

评论： Star Strider 2015-9-16

Sir i have two data series say

a                  b
36737061 -27.47956892
54391479 -23.68162398
76391602 -16.65254461
47177124 -19.20600915
25158691 -18.56570783
462646484 -14.39363913
785919189 -14.98048449
27481079 -18.49125231
851806641 -19.91135093
111236572 -5.049334665
-1.457702637 -6.51219601
85055542 -1.299793246

and i want to plot for a=0-5,6-10,11-15,16-20 with the corresponding average and standard deviation of b. Please help me with a easy way since the series are very large?

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Answer 1

Star Strider 2015-9-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/243174-how-to-bin-for-scatter-plot-from-two-data-series#answer_192467

编辑：Walter Roberson 2015-9-15

在 MATLAB Online 中打开

This seems to work:

m = [25.36737061 -27.47956892
20.54391479 -23.68162398
16.76391602 -16.65254461
9.47177124 -19.20600915
16.25158691 -18.56570783
4.462646484 -14.39363913
7.785919189 -14.98048449
12.27481079 -18.49125231
4.851806641 -19.91135093
2.111236572 -5.049334665
-1.457702637 -6.51219601
1.85055542 -1.299793246];
binedge = 0:5:20;                                       % Define Bin Edges
[acount, idx] = histc(m(:,1), binedge);                 % Bin ‘a’, Return Index Vector
meanb = accumarray(idx+1, m(idx+1,2), [], @mean);       % Get Mean Of Corresponding ‘b’
figure(1)
bar(binedge, acount, 'histc')
grid

One of the bin edge values is zero, and that doesn’t work as an index for accumarray, so I added 1 to the index values. That doesn’t affect the calculation.