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Swap first and last word in a string

Asked by Nobita Nobi on 18 May 2019 at 1:34
Latest activity Edited by madhan ravi
on 18 May 2019 at 2:31
Hi there,
Can anyone please tell me how to continue this task? I am able to find the first and last word but could not figure out the way to swap them.
Many thanks!
function f = swap(str)
s=' ';
sp=strfind(str,s);
for i=1:sp(1)-1
firstword(i)=str(i);
end
lastword = str(sp(end)+1:end);

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2 Answers

Answer by madhan ravi
on 18 May 2019 at 2:07
Edited by madhan ravi
on 18 May 2019 at 2:31

Simpler:
s = 'hello world';
Wanted = swap(s) % function call
% function
function Wanted = swap(str)
S = regexp(str,'\S*','match');
S([1,end]) = S([end,1]);
Wanted = strjoin(S);
end

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Answer by Image Analyst
on 18 May 2019 at 2:15

Here's one way:
% Create sample string.
str = 'one two three four five';
% Split apart into individual words without spaces.
words = strsplit(str)
% Swap the first and last words.
[words(end), words(1)] = deal(words(1), words(end))
% String the words together with spaces between them.
outputString = ''; % Initialize output
for k = 1 : length(words)
outputString = sprintf('%s ', outputString, words{k});
end
% Trim off the leading and trailing spaces.
outputString = strtrim(outputString)

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This adds an extra space inbetween words.
>> strlength(str)
ans =
23
>> strlength(outputString)
ans =
27
>>

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