spliting up a char array
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If I have a char variable... say x=2.1*3C how can i get 2.1 by itself as its own variable
采纳的回答
One answer to your question is to use indexing:
>> S = '2.1*3C'
S =
2.1*3C
>> T = S(1:3)
T =
2.1
If you want this as a numeric value then:
str2double(S(1:3))
Although there are many possible answers to your question, I suspect that this whole thing could be avoided by better planning and data concept. Could you please give us more information about what you are trying to do with the 2.1, and where this string comes from. Probably passing the data in something more suitable than a string would make your programming much simpler and more reliable.
2 个评论
me
2015-11-7
Image Analyst
2015-11-7
If it was "perfect" then you can also "vote" for the answer to give him double reputation points. That'd be a nice thing to do for him.
更多回答（1 个）
Image Analyst
2015-11-7
Some of the millions of ways:
% Set up (if the x= is part of the string):
myString = 'x=2.1*3C'
% Find the equal sign:
equalIndex = strfind(myString, '=');
% Find the *:
starIndex = strfind(myString, '*');
% Now get 2.1 in its own character variable:
itsOwnVariable = myString(equalIndex+1:starIndex-1) % as another string
% Now get 2.1 in its own character variable:
itsOwnVariable = str2double(myString(equalIndex+1:starIndex-1)) % As a double
% Set up with no x= in the string:
myString = '2.1*3C'
% Now get 2.1 in its own character variable:
itsOwnVariable = myString(1:3) % as another string
% Now get 2.1 in its own character variable:
itsOwnVariable = sscanf(myString, '%f') % As a double
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