Using a loop to replace spaces for underscore

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Laura Mendes
Laura Mendes 2021-6-12
评论： Laura Mendes 2021-6-13
Hello there, I am a complete begginer in Matlab and was given an exercise that took me a whole day and still, no success.
The following function puts a '\' in front of every underscore. I have to change this function in a way that it replaces every space for an underscore.
locs = strfind(instring, '_'); % finding all underscores
if isempty(locs)
outstring = instring;
else
outstring_start_ind = 1;
instring_start_ind = 1;
for underscore_cnt = 1:length(locs) % for each underscores
outstring(outstring_start_ind:(locs(underscore_cnt)+underscore_cnt-2)) = ...
instring(instring_start_ind:(locs(underscore_cnt)-1));
outstring(locs(underscore_cnt)+underscore_cnt-1) = '\';
outstring_start_ind = locs(underscore_cnt)+underscore_cnt;
instring_start_ind = locs(underscore_cnt);
end
outstring(outstring_start_ind:(length(instring)+underscore_cnt)) = ...
instring(instring_start_ind:end);
end
Is there someone who can give me a hand here, please? Thank you.
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Laura Mendes
Laura Mendes 2021-6-12
I tried this function within the main code where I use the posted function, and it did not work... :/

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回答（2 个）

John D'Errico
John D'Errico 2021-6-12
Ye gods, that is a complicated way to solve a job poorly. Sorry, but it is. Two lines, assuming you want the result in outstring. One line, if you are willing to replace in the original string.
outstring = instring;
outstring(instring == '_') = ' ';
That replaces every underscore with a space.
Steven Lord
Steven Lord 2021-6-12
Ran in:
Use the replace function.
before = 'Hello world'
before = 'Hello world'
after = replace(before, ' ', ' cruel ')
after = 'Hello cruel world'

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