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how to find non-numeric value from a matrix?

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Lisa
Lisa 2012-10-17
Hello,
I'm trying to give a numeric value to a non-numeric values. It seems to be a very simple problem but I just couldn't figure it out. Let's say I want to find the store number according to my t-shirt size.
First I define different sizes.
size = {'large', 'medium', 'small'};
Then, convert this non-numeric value to a numeric value for further use.
tshirt = find (size == 'medium');
This command doesn't work...I was hoping this command will give me back '2' which would be the column numer for 'medium' to give instructions to go store #2.
Is there any way to make this work? I'd appreciate a lot for any help/advices!

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采纳的回答

Jonathan Epperl
Jonathan Epperl 2012-10-17
To compare strings, you'll need strcmp or strcmpi, depending on whether you want case sensitive or insensitive.
>> tshirts = {'sm','med','lar'};
>> nr = find(strcmpi(tshirts,'med'))
nr =
2

更多回答（1 个）

Sean de Wolski
Sean de Wolski 2012-10-17
First and most importantly: don't name a variable size!!!! This is a super useful builtin function that when overwritten can cause disastrous effects.
Second, use strcmp
tsize = {'large', 'medium', 'small'};
find(strcmp(tsize,'medium'))

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