How to swap values of two variables?
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Daniel Contreras
le 23 Oct 2017
Commenté : lala
le 29 Août 2023
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 commentaires
Jan
le 19 Oct 2021
Modifié(e) : Jan
le 19 Oct 2021
@Subhashini Neelamegam: Yes, but this is more efficient:
function [b, a] = swap(a, b)
end
Réponse acceptée
David Goodmanson
le 23 Oct 2017
Hi Daniel,
Take a look at the 'deal' command, in this case [b a] = deal(a,b)
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Plus de réponses (3)
Jan
le 23 Oct 2017
Cheaper than deal:
function [b, a] = swap(a, b)
% This function has no body!
13 commentaires
Rik
le 29 Août 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)
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
AAMIR SHEIKH
le 11 Août 2020
Going Traditionally !!!
a = input("enter a :::");
b = input("enter b :::");
temp = a;
a = b;
b = temp;
[a b]
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