How to swap values of two variables?

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For instance, if i ask the user to input the values of a and b, in this case they choose a=10 and b=5 how would I be able to switch them so that it'll be a=5 and b=10.
  4 Comments
Jan
Jan on 19 Oct 2021
Edited: Jan on 19 Oct 2021
@Subhashini Neelamegam: Yes, but this is more efficient:
function [b, a] = swap(a, b)
end

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Accepted Answer

David Goodmanson
David Goodmanson on 23 Oct 2017
Hi Daniel,
Take a look at the 'deal' command, in this case [b a] = deal(a,b)

More Answers (3)

Jan
Jan on 23 Oct 2017
Cheaper than deal:
function [b, a] = swap(a, b)
% This function has no body!
  13 Comments
Rik
Rik on 29 Aug 2023
You generally need to warm up function calls if you want to test timings online. This should be reasonably stable. As you can see, they differ by a lot, but in the other direction than your post shows. Using a function instead of a script might also affect the timings (as you can see, the same code runs over 10x faster inside a function).
timeit(@test_deal);timeit(@test_swap);% warm-up round
timeit(@test_deal),timeit(@test_swap)
ans = 0.0798
ans = 0.0017
function test_deal
c1 = zeros(100);
c2 = ones(100);
for i = 1:100000
[c1,c2] = deal(c2,c1);
end
end
function test_swap
c1 = zeros(100);
c2 = ones(100);
for i = 1:100000
[c1,c2] = swap(c2,c1);
end
end
function [a,b] = swap(a,b)
end
lala
lala on 29 Aug 2023
@Rik Thanks for your reply. You are right. :)

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Daniel Afriyie
Daniel Afriyie on 13 Oct 2019
[b, a] = deal(a,b)

AAMIR SHEIKH
AAMIR SHEIKH on 11 Aug 2020
Going Traditionally !!!
a = input("enter a :::");
b = input("enter b :::");
temp = a;
a = b;
b = temp;
[a b]

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