for loop for different set of values

2015 6 22
3 个回答
回答已采纳
更新时间：2022 10 31
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Tim
Tim 2015-6-22
编辑：Tim 2015-6-22

15 个投票

A more polite way to ask in the event of urgency would be something like:
"I really need help on this one, time is a factor!"
a =[2:6 17:22]
for i=1:length(a)
y=2*a(i)
end
Or if you want to do it without a loop use vector form, which is generally more efficient in MATLAB:
a =[2:6 17:22];
y=2.*a;

更多回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2015-6-22
编辑：Azzi Abdelmalek 2015-6-22

2 个投票

It's better to avoid the variable i, because it's used by Matlab with complex numbers.
for ii= [2:6,17:22]
Y= 2*ii;
end
Walter Roberson
Walter Roberson 2015-6-22

1 个投票

for i = [2:6,17:22]
Y = 2*i;
end
Note that you are overwriting Y completely each time, which is a common error in for loops. When you are looping over values that are not consecutive integers and you want to get one output value for each input value then use something like
ivals = [2:6,17:22];
for k = 1 : length(ivals);
i = ivals(k);
Y(k) = 2 * i;
end

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