How to bin a simple number array?

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That One
That One 2016-7-25
评论： Steven Lord 2016-7-26
Hello,
I'm reading a simple number array from a .txt file (all integers) using:
fileID = fopen('control.txt','r');
formatSpec = '%d';
A = fscanf(fileID,formatSpec);
Now I want to bin these integers into a several groups:
Group 1: integers from 21 to 100;
Group 2: integers from 101 to 500;
Group 3: integers from 501 to 1000;
Group 4: integers from 1001 to infinity (max number unknown).
I'm also interested in finding the range (how many numbers) of each group.
Thank you!

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2016-7-25
A=1:120
[b,c]=histc(A,[21 50 60 100 inf])
out=accumarray(c'+1,(1:numel(c))',[],@(x) {A(x)})
out=out(2:end)
celldisp(out)
  1 个评论
That One
That One 2016-7-25
Hi Azzi,
Thanks for the quick answer. I'm actually trying to bin my number array into 4 groups and write the 4 groups into 4 .txt files as:
fileID = fopen('Group_1.txt','w');
fprintf(fileID, '%d\r\n',B);
fclose(fileID);
All I'm missing is the code to bin these numbers. Can you please show me how to do that? Thanks a lot!

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更多回答（1 个）

Steven Lord
Steven Lord 2016-7-25
Use the histcounts function and specify a vector of edges.
  4 个评论
显示 2更早的评论
Star Strider
Star Strider 2016-7-26
You have already come close to defining them:
Group 1: integers from 21 to 100;
Group 2: integers from 101 to 500;
Group 3: integers from 501 to 1000;
Group 4: integers from 1001 to infinity (max number unknown).
Use the max function to help you define the upper edge.
Experiment with to get the result you want.
Steven Lord
Steven Lord 2016-7-26
Or just specify Inf as the right endpoint of the last bin.

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