Select a subset from a larger dataset

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Evgeniia Diachek
Evgeniia Diachek 2018-11-8
回答： Kevin Chng 2018-12-17
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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采纳的回答

Kevin Chng
Kevin Chng 2018-12-17
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

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