Unrecognized table row name

14 次查看（过去 30 天）
LeoAiE
LeoAiE 2021-9-6
评论： LeoAiE 2021-9-7
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),:)

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2021-9-7
Ran in:
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);
Duplicate table row name: 'Andorra'.
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
Walter Roberson
Walter Roberson 2021-9-7
Ran in:
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,:)
ans = 19×4 table
lat lon country RandomCode _______ _________ _____________________ __________ 33.939 67.71 "Afghanistan" 41 41.153 20.168 "Albania" 53 -14.271 -170.13 "American Samoa" 59 42.546 1.6016 "Andorra" 1 -11.203 17.874 "Angola" 95 18.221 -63.069 "Anguilla" 54 -75.251 -0.071389 "Antarctica" 24 17.061 -61.796 "Antigua and Barbuda" 79 -38.416 -63.617 "Argentina" 83 40.069 45.038 "Armenia" 53 12.521 -69.968 "Aruba" 99 -25.274 133.78 "Australia" 58 47.516 14.55 "Austria" 64 40.143 47.577 "Azerbaijan" 83 23.685 90.356 "Bangladesh" 95 13.194 -59.543 "Barbados" 46
LeoAiE
LeoAiE 2021-9-7
@Walter Roberson Thank you so much I really appreciate your help. I always enjoy reading detailed explanations when you answer my questions and have a full understanding of where I missed up and how to fix it! You are awesome man. Keep up the great work.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

产品


版本

R2021a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by