How can I find a string in an array of strings? Error using strfind PATTERN must be a string scalar or character vector.

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Hannah_Mad 2020-5-5

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回答： Hannah_Mad 2020-5-12

采纳的回答： Image Analyst

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Dear all,

I am currently trying to derandomize a list of filenames. I do have a derandomization sheet for this. However, whenever I am trying to run the script I wrote for this I encounter the following error:

Error using strfind

PATTERN must be a string scalar or character vector.

Error in Derandomization (line 14)

idx = find(~cellfun(@isempty,strfind(N,C)))

This is my code:

clearvars
close all
basicpath = ('C:\path');
[~,~,raw] = xlsread('filenames_new_sheet.xlsx');
T = readtable('derandomization.xlsx');
t = T{:,'Filename'}
newStr = erase(t,'_kakaka'); %get body of filenames to match 
C = unique(newStr) % delete filenames that exist more than once
N = raw(:,2); runr
j = size(C)
k = size(N)
for n = 1:j    
for m = 1:k
idx = find(~cellfun(@isempty,strfind(N,C)))
end
end

>> class N

ans =

'char'

>> class C

ans =

'char'

Why do I keep getting this error message everytime? And what can I do to avoid it? Thank you, everyone.

Kindly

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Stephen23 2020-5-6

@Hannah_Mad: please upload the some sample variables (e.g. raw and T) or the original files, and please show or describe the expected output for those exact variables/files.

Image Analyst 2020-5-12

Hannah, again I think you misunderstood Stephen's comment. When he said "please upload the some sample variables (e.g. raw and T) or the original files" he meant to attach 'Effekte_der_DBS_korrigiert.xlsx' or 'DDK_acoustic_durations.xlsx' using the paper clip icon. And I'm not seeing those anywhere on this page on any of your posts. We'll check back later for them.

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采纳的回答

Image Analyst 2020-5-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/523182-how-can-i-find-a-string-in-an-array-of-strings-error-using-strfind-pattern-must-be-a-string-scalar#answer_430464

Try contains(). Not sure what derandomize means. Do you mean sort according to some vector of values or alphanumerically?

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Hannah_Mad 2020-5-6

Unfortunately it does not work as I want to search substrings.

Image Analyst 2020-5-12

But Hannah, I think you misunderstood. Stephen was merely pointing out the differences between ismember() and contains(). ismember() does not search substrings, while contains() does search substrings. So again, I ask did contains() work for you?

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