Extracting nth element of nested cell array

Question

Isaac 2014-8-12

0
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https://ww2.mathworks.cn/matlabcentral/answers/147324-extracting-nth-element-of-nested-cell-array

回答： Azzi Abdelmalek 2014-8-12

I'm trying to extract the nth element of a nested cell array. The nested cell array is of filenames in a directory that are delimited with underscores. I want to extract the 3rd element from each filename and put it into a vector.

Here's my code:

filesInDirectory = dir('InsertDirectoryHere');
filenames = {filesInDirectory.name};
filenameSplit = regexp(filenames, '_', 'split');

The contents of 'filenameSplit' is 33 columns with a 1x5 cell array in each column. I want to extract the 3rd cell in each column and put it into a vector. Here's my attempt:

id = filenameSplit{:}{3};

This does not work, but I can see all elements with the following command (I just don't know how to subset to keep only the 3rd element in each cell array):

filenameSplit{:}

I've read through the forums for similar problems, but I can't find a way to generalize their answers to my problem. I'm new to Matlab so any help would be greatly appreciated.