Select a subset from a larger dataset

Question

Evgeniia Diachek 2018-11-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/428810-select-a-subset-from-a-larger-dataset

回答： Kevin Chng 2018-12-17

采纳的回答： Kevin Chng

在 MATLAB Online 中打开

Hi,

I am trying to select a subset from a dataset using the following command:

if true
t = readtable('my_table.csv');
data = table2dataset(t);
M_L = data(data.System=='M' & data.Hemisphere=='L',:);
M_R = data(data.System=='M' & data.Hemisphere=='R',:);
end

But I am getting an error: Undefined operator '==' for input arguments of type 'cell'.

Any ideas how to fix that? I will need to select mulpitle subsets with different variables, so I would prefer not to use strcmp or strmatch.

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Answer 1

Kevin Chng 2018-12-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/428810-select-a-subset-from-a-larger-dataset#answer_352724

在 MATLAB Online 中打开

Undefined operator '==' for input arguments of type 'cell'.

The operator is not for cell. Therefore, you have to convert the cell type to matrix first. However, i'm not sure whether data.System or data.Hemisphere is cell type, or both are cell type.

try

if true
t = readtable('my_table.csv');
data = table2dataset(t);
M_L = data(cell2mat(data.System)=='M' & cell2mat(data.Hemisphere)=='L',:);
M_R = data(cell2mat(data.System)=='M' & cell2mat(data.Hemisphere)=='R',:);
end