Calculating Average Duration/Length in an Array

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David 2014-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/166370-calculating-average-duration-length-in-an-array

评论： Star Strider 2014-12-12

Hello,

I have an array that contains 1 2 3 which each represents a state i.e) 1=sunny day 2=rainy day 3=cloudy day. The array is about 1 million length.

Example: [3 3 3 1 1 1 1 2 1 1 2 3 3]

I would like to figure out the average duration of each state. For state 1, it would be (4+2/2)= 3 days. For state 2, it would be (1+1/2=)1day. And state 3 it would be (3+2/2)=2.5days

I'm wondering if anyone has any suggestion or tips on how to do this with minimal code.

Cheers, David

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Answer 1

Star Strider 2014-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/166370-calculating-average-duration-length-in-an-array#answer_162102

在 MATLAB Online 中打开

The histc function (with help from unique) is probably the easiest option:

W =  [3 3 3 1 1 1 1 2 1 1 2 3 3];
bins = unique(W);
k = histc(W,bins);
avg = k./2;

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David 2014-12-12

Thanks, I got it all figured out now. Your advice and http://www.mathworks.com/matlabcentral/newsreader/view_thread/331664 helped me do it

Star Strider 2014-12-12

My pleasure!

I thought you might want to find out the number of repeated sequences next, but I opted to wait and find out. I’m glad you found an applicable solution to the repeated-sequence problem.

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