How can I split a string and assign new values to the strings?
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If if want to change the string
str='Hello'
Into a new string with the values
str='Hotel-Echo-Lima-Lima-Oscar'
How do I do that?
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the cyclist
le 9 Jan 2017
Modifié(e) : the cyclist
le 9 Jan 2017
Here is one way:
natoLookup = {'h','Hotel-';
'e','Echo-';
'l','Lima-';
'o','Oscar-';
};
str = 'Hello';
newstr = '';
for nc = 1:numel(str)
[tf,loc] = ismember(lower(str(nc)),natoLookup(:,1));
newstr = [newstr,natoLookup{loc,2}];
end
% Trim the excess hyphen
newstr(end) = [];
3 commentaires
Image Analyst
le 9 Jan 2017
If you modify natoLookup to include every character you want to replace (the whole alphabet plus symbols) and change str to be whatever word you want to operate on, then it will be completely general.
the cyclist
le 9 Jan 2017
As @ImageAnalyst states, it will be general after you generalize the lookup table.
One other quick comment: If you are planning to use this with very long text, it would be best to modify this code to preallocate memory for newstr. The current algorithm will manage memory poorly.
Stephen23
le 9 Jan 2017
Modifié(e) : Stephen23
le 9 Jan 2017
Using indexing means no loops and a very memory-efficient method:
>> str = 'Hello World!';
>> tmp = num2cell(str);
>> idx = isletter(str);
>> C = {'Alpha', 'Bravo', 'Charlie', 'Delta', 'Echo', 'Foxtrot', 'Golf', 'Hotel', 'India', 'Juliet', 'Kilo', 'Lima', 'Mike', 'November', 'Oscar', 'Papa', 'Quebec', 'Romeo', 'Sierra', 'Tango', 'Uniform', 'Victor', 'Whiskey', 'Xray', 'Yankee', 'Zulu'};
>> tmp(idx) = strcat(C(1+upper(str(idx))-'A'),'-');
>> [tmp{:}]
ans = Hotel-Echo-Lima-Lima-Oscar- Whiskey-Oscar-Romeo-Lima-Delta-!
Or with a bit of attention to the hyphens:
>> D = {'','-'};
>> idy = idx & [idx(2:end),false];
>> tmp(idx) = strcat(C(1+upper(str(idx))-'A'),D(1+idy(idx)));
>> [tmp{:}]
ans = Hotel-Echo-Lima-Lima-Oscar Whiskey-Oscar-Romeo-Lima-Delta!
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