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avoiding nested for loops for matrix assignment

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JAMMI ASHOK
JAMMI ASHOK 2020-10-15
评论： KSSV 2020-10-15
Hi,
I am a beginner to matlab. Can you please tell me how to avoid using nested for loops in matlab.
THis piece of code is taking lot of space in my hard drive and time.
for i = 1:10000
for j = 1:10000
a(i,j) = i+j
end
end

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KSSV
KSSV 2020-10-15
编辑：KSSV 2020-10-15
m = 10000 ; n = 10000 ;
[i,j] = meshgrid(1:n,1:m) ;
a = i+j ;
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JAMMI ASHOK
JAMMI ASHOK 2020-10-15
Yes. If I am initializing it is improving the speed.
KSSV
KSSV 2020-10-15
If you are using a loop and filling the values into matrix......you must initilaize the matrix before loop.

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更多回答（1 个）

Matt J
Matt J 2020-10-15
编辑：Matt J 2020-10-15
x = 1:10000;
a = x.' + x;

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