How to swap values of two variables?
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Daniel Contreras
il 23 Ott 2017
Commentato: lala
il 29 Ago 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 Commenti
Jan
il 19 Ott 2021
Modificato: Jan
il 19 Ott 2021
@Subhashini Neelamegam: Yes, but this is more efficient:
function [b, a] = swap(a, b)
end
Risposta accettata
David Goodmanson
il 23 Ott 2017
Hi Daniel,
Take a look at the 'deal' command, in this case [b a] = deal(a,b)
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Più risposte (3)
Jan
il 23 Ott 2017
Cheaper than deal:
function [b, a] = swap(a, b)
% This function has no body!
13 Commenti
Rik
il 29 Ago 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
il 11 Ago 2020
Going Traditionally !!!
a = input("enter a :::");
b = input("enter b :::");
temp = a;
a = b;
b = temp;
[a b]
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