Get index value of given input

Question

Dion Theunissen 2021-2-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747912-get-index-value-of-given-input

评论： Dion Theunissen 2021-2-17

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Hi,

I need the index value of a given input.

I have a .xlsx file with in column1 values like 0000150 and M040.

I open the xlsx file and want to find the indexnumber of the variable of 'num' .

Now I have tried the folowing but ofcourse, this doesnt work:

close all; clear all; clc;
% read folder and files
files = dir('C:\Users\dit\Documents\MATLAB\RawData');
dirFlags = [files.isdir];
subFolders = files(dirFlags);
data = readtable('data_gegevens.xlsx'); 
data2 = table2cell(data(:,1));
for j = 3:length(subFolders)
    num = subFolders(j).name;
    num2 = convertCharsToStrings(num);
 
    Index = strfind(data2, num2)
 
end

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Walter Roberson 2021-2-17

I need to open the xlsx file and find the indexnumber of the variable.

I do not understand what you are asking for.

Are you asking to go through the list of subfolders in a given folder, and locate the name in column 1 of the xlsx file, extracting the index for each subfolder name?

If so, that is certainly possible, but you should also define the behaviour you want when the name is not found in the file.

Dion Theunissen 2021-2-17

That is indeed what i want. Now it doesn't find anything

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Answer 1

Walter Roberson 2021-2-17

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747912-get-index-value-of-given-input#answer_625677

编辑：Walter Roberson 2021-2-17

在 MATLAB Online 中打开

Note: the comparison that is done will include any file extension that might show up for the subfolders. MS Windows typically hides the file extension for folder names, but there are cases where an extension can be present.

files = dir('C:\Users\dit\Documents\MATLAB\RawData');
dirFlags = [files.isdir];
subFolders = files(dirFlags);
subnames = {subFolders.name};
data = readtable('data_gegevens.xlsx');
col1 = data{:,1};
[found, Index] = ismember(subnames, col1);
if any(~found)
    warning('%d subfolders not in list. Their Index will be 0', nnz(~found));
end