How can I withdraw a colon operator from a string

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Juan Rosado
Juan Rosado 2012-8-16
I have a colon operator within a string input (<1x30> char) that I would like to withdraw for later plotting.
The variable input is this:
WIND = NORTHEAST WINDS 8 : 13 KNOTS
I want just the characters
'8 : 13'
and make them operate as a colon operator. I was thinking of using a variation of 'find' command, but I don't know how to tell MATLAB to find colon operators within a text string.
Can you please help?

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回答（3 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-8-17
编辑：Azzi Abdelmalek 2012-8-17
c1='WIND = NORTHEAST WINDS 8 : 13 KNOTS'
a=regexp(c1,'[0-9]')
result=c1(min(a):max(a))
Matt Kindig
Matt Kindig 2012-8-17
编辑：Matt Kindig 2012-8-17
Mr. Azzi's technique is more general, and I would use it for your purpose.
However, if you did want to use 'find' to locate specific characters in a text string, you can do it simply as:
a = 'WIND = NORTHEAST WINDS 8 : 13 KNOTS'
location = find(a==':');
Matt Fig
Matt Fig 2012-8-17
编辑：Matt Fig 2012-8-17
Here is another.
str = 'WIND = NORTHEAST WINDS 8 : 13 KNOTS'; % Example string
m = regexp(str,'\d+\s*:\s*\d+','match')
% Now to make it operate as a colon operator in an expression:
N = str2num(m{1})

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