string choppping

2011 6 17
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Is there a way to chop off part f a sting after a certain set of characters?
If I use strtok( ) It seems to only look at the first character in the deliminter. Is there a way to make the command look at a certain string as a delimiter rather than a char?
Thanks

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William
William 2011-6-20
Here is my code so far
clc
clear
outloc = 'D:\Documents and Settings\212068586\My Documents\MATLAB'
pat = 'MATLAB';
endpoint = regexp(outloc, pat);
newstring = [];
for w = 1:length(outloc)
if w < endpoint
newstring(w) = outloc(w);
end
disp(newstring)
end
I am getting a boatload of nnumbers and am wondering if this is ascii or something??
Thanks
Walter Roberson
Walter Roberson 2011-6-20
Initialize with newstring = '';

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Fangjun Jiang
Fangjun Jiang 2011-6-20

1 个投票

Not sure what your "chopping" try to achieve, could the fileparts() function help you task?
>> [PathStr,Name,Ext]=fileparts(outloc)
PathStr =
D:\Documents and Settings\21286\My Documents
Name =
MATLAB
Ext =
''

更多回答（6 个）

Walter Roberson
Walter Roberson 2011-6-17

1 个投票

As you are chopping, you could use strfind to get the index (watch out for multiple occurrences) and then use straight indexing.
Fangjun Jiang
Fangjun Jiang 2011-6-17

0 个投票

help strrep
help regexp
help regexprep
If you provide an example, many expert would be eager to try their regular expression skills.
Andrew Newell
Andrew Newell 2011-6-17

0 个投票

token = strtok(str, delimiter)

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Walter Roberson
Walter Roberson 2011-6-17
Nope. "If the delimiter input specifies more than one character, MATLAB treats each character as a separate delimiter; it does not treat the multiple characters as a delimiting string"
Andrew Newell
Andrew Newell 2011-6-17
How dare MATLAB conflict with my personal reality? However, the source code for STRTOK would make a good starting point for creating a function that handles longer delimiters.

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William
William 2011-6-20

0 个投票

The string I am trying to chop up is this:
>> outloc = 'D:\Documents and Settings\21286\My Documents\MATLAB'
I'd like to be able to chop it off right before "\MATLAB" as it turns out there are more than one 's\' instances within the string.

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Fangjun Jiang
Fangjun Jiang 2011-6-20
You shall explain what is your need for the "chopping". Giving a path string and get the lowest folder name? If that is the case, fileparts() would be the best. This outloc is just an example, right? There are many ways to do it. For example:
regexprep(outloc,'.+\\','')

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Gerd
Gerd 2011-6-20

0 个投票

Hi William,
if you use
str = outloc(strfind(outloc,'\MATLAB'):end)
you will get
str = \MATLAB
Gerd
William
William 2011-6-21

0 个投票

Here is my function:
function newstring = stringchopeer(stringinput, pat) % The purpose of this m file is to chop the ends off strings % the "pat" is the beginning of the area in which we would like to see % chopped
%Example: %pat = 'MATLAB'; %stringinput = 'D:\Documents and Settings\212068586\My Documents\MATLAB'
endpoint = regexp(stringinput, pat); newstring = []; for w = 1:length(stringinput) if w < endpoint newstring(w) = stringinput(w); end
end disp(char(newstring))
It works but I think it outputs ascii at the same time????
Thanks
Bill

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Fangjun Jiang
Fangjun Jiang 2011-6-21
Bill, would newstring=regexprep(stringinput,[pat,'.*'],'') work for your task?

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