Find a substring in table

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katharina voigt
katharina voigt 2019 年 8 月 26 日
回答済み: Lei Hou 2019 年 8 月 30 日
I'm struggling with finding the rows of columns that contains a certain substring (e.g. '.jpg') in a table column?
Any suggestions?

回答 (3 件)

Lei Hou
Lei Hou 2019 年 8 月 27 日
Hi Katharina,
You can make use of table indexing to get that data you want. I’ll use a simple example below to illustrate the output.
Suppose the table is like the following:
Var1 Var2 Var3
___________ ____ ____________
"file1.png" 1 "Image1.jpg"
"file2.jpg" 2 "Image2.jpg"
"file3.gif" 3 "Image3.gif"
"file4.jpg" 4 "Image4.png"
If you want to check which rows of column ‘Var1’ end with ‘.jpg’ and return those rows with all columns, here is the solution.
>> t1 = t(endsWith(t.Var1,'.jpg'),:);
The output 't1' is like the following
Var1 Var2 Var3
___________ ____ ____________
"file2.jpg" 2 "Image2.jpg"
"file4.jpg" 4 "Image4.png"
I’m not sure whether I understand your question correctly. If not, please provide more information about your use case or illustrate your expected output with my simple example.

katharina voigt
katharina voigt 2019 年 8 月 28 日
編集済み: katharina voigt 2019 年 8 月 28 日
Thanks Lei for your response.
My question has changed a bit, but in essence it is the same.
I would like to have the row number, when t.Code == 'Response:' (the digits behind response can change and that is why i would like to have it more flexible.
So at the moment I tried this
However, I get the following error:
Error using contains
Search term must be a string array, character vector, or cell array of character vectors.
Following this i tried
But it said that the conersion to cell from categorical is not possible.
Please find table (t) attached.
Thank you very much in advance.

Lei Hou
Lei Hou 2019 年 8 月 30 日
Hi Katharina,
You should cellstr to convert the categorical data to a cell array of character vectors as:
You can also call string to convert the categorical data to a string array as:
Since R2018b, it is highly recommended to use string instead of cellstr when you work with text because string is more efficient.


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