How to swap values of two variables?
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Daniel Contreras
el 23 de Oct. de 2017
Comentada: lala
el 29 de Ag. de 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 comentarios
Jan
el 19 de Oct. de 2021
Editada: Jan
el 19 de Oct. de 2021
@Subhashini Neelamegam: Yes, but this is more efficient:
function [b, a] = swap(a, b)
end
Respuesta aceptada
David Goodmanson
el 23 de Oct. de 2017
Hi Daniel,
Take a look at the 'deal' command, in this case [b a] = deal(a,b)
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Más respuestas (3)
Jan
el 23 de Oct. de 2017
Cheaper than deal:
function [b, a] = swap(a, b)
% This function has no body!
13 comentarios
Rik
el 29 de Ag. de 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
el 11 de Ag. de 2020
Going Traditionally !!!
a = input("enter a :::");
b = input("enter b :::");
temp = a;
a = b;
b = temp;
[a b]
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