Strings are converted to cells during readtable
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I am incrementally saving data to a csv file which includes strings:
data = table("string1", "string2");
writetable(data, "data.csv");
Later on:
data_from_file = readtable('data.csv')
data_from_file =
1×2 table
Var1 Var2
___________ ___________
{'string1'} {'string2'}
Note that the data are now char arrays in cells.
This is causing lots of problems, for example when I try to join the old data with the new:
new_data = table("string1", "string2");
data = outerjoin(data_from_file, new_data, 'MergeKeys', true)
Error using tabular/outerjoin (line 152)
Left and right key variables 'Var1' and 'Var1' are not comparable because one is
a non-cell.
Is there a way to avoid this problem or convert the chars back to strings after readtable?
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更多回答(2 个)
Adam Danz
2024-1-4
When using the readtable(filename,opts,Name,Value) syntax, only a limited number of name-values pairs are available as input arguments and TextType is not one of them. If you are using the import options object and would like to enforce strings for text type, specify this name-value pair as an argument in detectImportOptions()
opts = detectImportOptions(filename,'TextType','string');
T = readtable(filename,opts)
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KSSV
2022-6-10
You can convert cell into a string and then use join.
data = table("string1", "string2");
writetable(data, "data.csv");
data_from_file = readtable('data.csv') ;
for i = 1:width(data_from_file)
data_from_file.(i) = string(data_from_file.(i)) ;
end
new_data = table("string3", "string4");
data = outerjoin(data_from_file, new_data, 'MergeKeys', true)
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