string choppping

12 views (last 30 days)
William
William on 17 Jun 2011
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
  2 Comments
William
William on 20 Jun 2011
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 on 20 Jun 2011
Initialize with newstring = '';

Sign in to comment.

Accepted Answer

Fangjun Jiang
Fangjun Jiang on 20 Jun 2011
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 =
''

More Answers (6)

Walter Roberson
Walter Roberson on 17 Jun 2011
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 on 17 Jun 2011
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 on 17 Jun 2011
token = strtok(str, delimiter)
  2 Comments
Walter Roberson
Walter Roberson on 17 Jun 2011
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 on 17 Jun 2011
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.

Sign in to comment.


William
William on 20 Jun 2011
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.
  1 Comment
Fangjun Jiang
Fangjun Jiang on 20 Jun 2011
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,'.+\\','')

Sign in to comment.


Gerd
Gerd on 20 Jun 2011
Hi William,
if you use
str = outloc(strfind(outloc,'\MATLAB'):end)
you will get
str = \MATLAB
Gerd

William
William on 21 Jun 2011
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
  1 Comment
Fangjun Jiang
Fangjun Jiang on 21 Jun 2011
Bill, would newstring=regexprep(stringinput,[pat,'.*'],'') work for your task?

Sign in to comment.

Categories

Find more on Characters and Strings in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!