How to access vector elements one by one and do some calculation?

Question

laith Farhan 2018-8-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/413905-how-to-access-vector-elements-one-by-one-and-do-some-calculation

评论： laith Farhan 2018-8-7

Dear all, I am facing problem with for loop, I have vector D has some values, the question is how to access these value one by one to do some calculation. I have done the below code but it does not work. Anyone could help me please.

    p=2;
    e1=0.5
    c=10;
    D= [0,0,100,0,39,0,0,55,0,7];
    for g=1:length(D) 
        if (D(g)>50)
            T1(g)=(e1*p) + c.*(D.^3);
        end
        if (D(g)<=50)
            T2(g)=(e1*p) + c.*(D.^2);
        end
    end
    T1=[0,0,10000001,0,0,0,0,1250001,0,0];
    T2=[0,0,0,0,15211,0,0,0,0,491];
    Re=(T1) + (T2);

The expected results: [0,0,10000001,0,15211,0,0,1250001,0,491];

2 个评论
显示无隐藏无

Adam Danz 2018-8-7

编辑：Adam Danz 2018-8-7

在 MATLAB Online 中打开

Your code breaks at this line

T2(g)=(e1*p) + c.*(D.^2);

The reason it breaks is because you're assigning a vector to a single index T2(g). Did you mean D(g)?

There are additional problems but we can start there.

In the future, if you want to improve your chances of getting help here, make sure your code is formatted properly and you specifically explain the problem you're having.

laith Farhan 2018-8-7

在 MATLAB Online 中打开

Thanks Adam for helping me and sorry for the mistakes happened.

Regard to your solution, I have change D into D(g) but unfortunately the problem still valid. The length of T1 showed me less that D. At the end I need to do (T1+T2) but matrix dimension must agree.

   p=2;
    e1=0.5
    c=10;
    D= [0,0,100,0,39,0,0,55,0,7];
    for g=1:length(D) 
        if (D(g)>50)
            T1(g)=(e1*p) + c.*(D(g).^3);
        end
        if (D(g)<=50)
            T2(g)=(e1*p) + c.*(D(g).^2);
        end
    end

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

OCDER 2018-8-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/413905-how-to-access-vector-elements-one-by-one-and-do-some-calculation#answer_331892

在 MATLAB Online 中打开

 p  = 2; 
 e1 = 0.5; 
 c  = 10; 
 D  = [0,0,100,0,39,0,0,55,0,7];
 Re = zeros(size(D));
 GT50Loc = D > 50; %Greater than 50 logical index
 Re( GT50Loc) = e1*p + c*D( GT50Loc).^3;  %Your "T1"
 Re(~GT50Loc) = e1*p + c*D(~GT50Loc).^2;  %Your "T2", but already added with you "T1".
 Re =
 1  1  10000001  1  15211   1  1  1663751  1  491

But the results are different from expected. Double check your expected values, or explain how you calculated them as the equation in the code you gave is ambiguous.