How to avoid unwanted values in for loop
显示 更早的评论
Hi everybody, I am using the following for loop code
for j = 3:1:6
A(j)=1*10.^(-j);
end
This gives me A=[0 0 0.001 0.0001 1e-05 1e-06]
I need the value of A for j = 3, 4, 5, and 6. In the above result my desired values are (0.001 0.0001 1e-05 1e-06). I don’t know from where the first 2 values (0 0) come, which are not required here. Any guidance will be appreciated thanks
采纳的回答
madhan ravi
2018-12-31
编辑：madhan ravi
2018-12-31
Reason: The first two elements are zero because you assign the values from index three so matlab assigns the first two values as zeros because matlab index starts from one.
You don't need loop at all:
A=10.^(-(3:6));
But if you insist one then:
n=3:6;
A=zeros(1,numel(n)); % preallocate
for j = 1:numel(n)
A(j)=10.^(-n(j));
end
A
Gives:
A=[ 0.001, 0.0001, 0.00001, 0.000001]
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Mathematics 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
