My cell array has 861 rows and each row has vectors of varying sizes. I want to calculate std dev only for cells that have 20 elements. Others should give a value of 0. How do I tell cellfun to get only the cells with 20 elements. Here is my attempt

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Syeda Amberin 2018-5-22

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https://ww2.mathworks.cn/matlabcentral/answers/402000-my-cell-array-has-861-rows-and-each-row-has-vectors-of-varying-sizes-i-want-to-calculate-std-dev-on

评论： Syeda Amberin 2018-5-22

Stds=cellfun(@std ,ratios,'UniformOutput',false); % trying to calculate standard dev for cells for cell array 'ratios' that have 20 elements. All other cells should give 0.

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Answer 1

the cyclist 2018-5-22

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编辑：the cyclist 2018-5-22

在 MATLAB Online 中打开

ratios = {rand(19,1); rand(20,1); rand(21,1)}  
cellfun(@(x)std(x)*(numel(x)==20),ratios)

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Syeda Amberin 2018-5-22

Thanks. Worked perfectly.

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My cell array has 861 rows and each row has vectors of varying sizes. I want to calculate std dev only for cells that have 20 elements. Others should give a value of 0. How do I tell cellfun to get only the cells with 20 elements. Here is my attempt

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My cell array has 861 rows and each row has vectors of varying sizes. I want to calculate std dev only for cells that have 20 elements. Others should give a value of 0. How do I tell cellfun to get only the cells with 20 elements. Here is my attempt

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