For loop: access values in between steps
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Simon Allosserie
on 21 Jan 2021
Commented: Yvan Lengwiler
on 21 Jan 2021
Hi
I have a for-loop where first only certain rows of a matrix are dealt with:
for i = 1:3:100 %3 is an example step size, the step size is a variable in the program
%do something with rows 1, 4, 7, 10, 13, 16 ...
end
After this, the remaining rows, i.e. rows 2,3, 5,6, 8,9, ... need to be filled up using the data in the rows calculated above. I don't see which would then be the most optimal method to define this new for loop. Possibly, for loops aren't even the best way to approach this? Thanks for your input!
2 Comments
Mathieu NOE
on 21 Jan 2021
hello Simon
if your computations can be vectorize there is no need to do for loops here
now, if you have to do more complicated stuff like doing ode solving for example , there is no other way than doing it with a for loop
it all depends on what the computation is about
Accepted Answer
Yvan Lengwiler
on 21 Jan 2021
for i = 1:3:100
%do something with rows 1, 4, 7, 10, ...
end
for i = 2:3:100
%do something with rows 2, 5, 9, 11, ...
end
for i = 3:3:100
%do something with rows 3, 6, 10, 12, ...
end
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