Swap first and last word in a string

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);

Answer 1

[madhan ravi]

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  

Answer 2

[Image Analyst]

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)

[madhan ravi]

This adds an extra space inbetween words.

>> strlength(str)

ans =

    23

>> strlength(outputString)

ans =

    27

>>