How to find the index of missing values in a cell array without looping through each element?

Question

Julia Smith 2022-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/1757435-how-to-find-the-index-of-missing-values-in-a-cell-array-without-looping-through-each-element

回答： Bharat Chandra Mukkavalli 2022-7-11

S1 = struct();
S2 = struct();
C = {S1 S2 missing};

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Answer 1

Voss 2022-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/1757435-how-to-find-the-index-of-missing-values-in-a-cell-array-without-looping-through-each-element#answer_1004710

在 MATLAB Online 中打开

You can use cellfun to call ismissing on the contents of each cell:

S1 = struct();
S2 = struct();
C = {S1 S2 missing}
C = 1×3 cell array
    {1×1 struct}    {1×1 struct}    {1×1 missing}
is_missing = cellfun(@ismissing,C)
is_missing = 1×3 logical array
   0   0   1
idx_missing = find(is_missing)
idx_missing = 3

(That's not got much loops.)

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Answer 2

Bharat Chandra Mukkavalli 2022-7-11

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Hi,

You can use the "cellfun()" function to apply a function to all the contents in a cell array. Further documentation on cellfun() can be found here: https://in.mathworks.com/help/matlab/ref/cellfun.html

Refer to link here on finding the indices of non-empty cells in a cell array: https://in.mathworks.com/matlabcentral/answers/42283-index-non-empty-cells-in-cell-array

Hope this helps!