How to Compare strings

Pap
2011 4 30
2 个回答
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Hello,
I need to compare strings and sort in (even in alphabetical order) but without using
the sort code.
I run a code and I get the error message:
Undefined function or method 'gt' for input arguments of type 'cell'.
Error in ==> Untitled3 at 16 if stock(b)>stock(b+1)
Can anyone help on how to solve this or how to compare strings, or how to convert strings to numbers in order to compare them?
Many thanks
Panos

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Jan
Jan 2011-5-1

2 个投票

You want to operate on the cell elements, not on scalar cells:
if stock(b) > stock(b+1)
% ==>
if stock{b} > stock{b+1} % Curly braces!
This works, if both strings have the same length. A conversion to a numerical is not needed. If the strings have different length, pad the shorter one with zeros:
char0 = char(0);
s1 = stock{b};
s2 = stock{b+1};
len1 = length(s1);
len2 = length(s2);
if len1 > len2
s2 = [s2, char0(1, len1 - len2)];
elseif len2 > len1
s1 = [s1, char0(1, len2 - len1)];
end
if s1 > s2 ...

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Robert Cumming
Robert Cumming 2011-4-30

0 个投票

Have you tried:
strcmp
to convert to numbers
str2num

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Pap
Pap 2011-4-30
thanks,
I need to sort string alphabetically. So I can't use strcmp.
actually I have a txt file of 6 columns and 100000 rows, saved as six 1x100000 cell arrays. I want to sort all the rows with respect to the first cell array (alphabetically)
Any hint?
Robert Cumming
Robert Cumming 2011-5-1
why cant you use sort?

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