Unrecognized table row name
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Hello everyone,
I have a table and I want to subscript using a column contain a string array. Basically, the column is repeated countries names and I used unique to get unique values. Then I wanted to get all the available information from the table about those countries. I understand I will lose some data from other columns, but this is not a concern at this time. I get an error message saying “unrecognized row name”
Any other methods can achieve the results? here is my code and my data
Data = readtable('Test.xlsx');
Data.country = string(Data.country);
Data(unique(Data.country),:)
采纳的回答
In order to index by a string or categorical in the first index of a table, the values have to have been set as the RowNames property.
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/730924/Test.xlsx';
Data = readtable(filename);
Data.Properties.RowNames = string(Data.country);
Data(unique(Data.country),:)
You can see from this that every row name must be unique.
The indexing done with the first index of a table is not equivalent to a SELECT operator that would select all matches. Instead, the RowName that is set must be unique, must identify exactly one row in the table.
2 个评论
If you want to get at the first match for each country:
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/730924/Test.xlsx';
Data = readtable(filename);
Data.country = string(Data.country);
[~, ia] = unique(Data.country);
Data(ia,:)
LeoAiE
2021-9-7
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