Hey, I am having trouble indexing into string vectors

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Andrzej Mamczura
Andrzej Mamczura 2020-4-27
评论： Steven Lord 2020-4-27
I am having trouble indexing into string arrays using logical values. As an example:
res = ["ABC" , "DEF" , "GHI"]
tf = [ 1 0 1 ]
x = res(tf)
I expect MATLAB to return
x = ["ABC" , "GHI"]
however instead i get the following error
"Array indices must be positive integers or logical values."

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采纳的回答

Sriram Tadavarty
Sriram Tadavarty 2020-4-27
Hi,
Update this as below:
res = ["ABC" , "DEF" , "GHI"]
tf = [1 0 1]; % This is of type double, so convert to logical as below
x = res(tf == 1);
Hope this helps.
Regards,
Sriram
  2 个评论
Steven Lord
Steven Lord 2020-4-27
Many functions and pieces of functionality in MATLAB treat 1 and true as roughly equivalent and the same for 0 and false.
Indexing is not one of those pieces of functionality.
If you wanted to avoid having to compare tf each time you wanted to use it as an index, I'd create it as a logical array.
res = ["ABC", "DEF", "GHI"];
tf = [true false true]
res(tf)

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更多回答（1 个）

Anna Case
Anna Case 2020-4-27
tf = [1 3] is what you are looking for. If you open up the variable res, you will see "ABC" is in index 1 and "GHI" is in index 3.

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