How to add values into a vector with for loop in a function

Question

Sabine Merzoug 2020-3-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513414-how-to-add-values-into-a-vector-with-for-loop-in-a-function

评论： Sabine Merzoug 2020-3-28

Hi,

I want to add values for every loop of t. The function looks like this:

function[SOC_a] = test1(P_batt, SOC_a,E_0,t)
for i=1:1439
  
   
while i>=t
        while SOC_a(i) <= 0.5
            SOC_a(i+1) = SOC_a(i) + 1/(E_0) * P_batt/60; 
            return
        end
end 
end 
end
 

And the "mainscript" looks like this:

SOC_a= zeros(1,1440);
P_batt=50;
E_0=1000;
for t=1:1440
    
SOC_a(1)=0.2;
[SOC_a(t)] = test1(P_batt, SOC_a(t),E_0,t);
end 
disp(SOC_a)

The value of SOC_a is supposed to increase for every loop, but when I run the script it says that "In an assignment A(:) = B, the number of elements in A and B must be the same." but I don't understand why. SOC_a is always a 1x1440 vector. It works when there is no function and everything is written in the main code. But I want to know why it doesnt work when it's in the function.

Can anybody help me please?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Peng Li 2020-3-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513414-how-to-add-values-into-a-vector-with-for-loop-in-a-function#answer_422391

It looks that in your function test1, the second parameter SOC_a is supposed to be a vector.

While in your main function, when you call test1, you only pass a scalar to it by SOC_a(t). This scalar is extended in test1, and resulted in a vectorized SOC_a, which you are trying to assign it to a scalar SOC_a(t).

Your code is quite twisted. I guess you only want to output the last element of SOC_a in your function test1?

3 个评论
显示 1更早的评论隐藏 1更早的评论

Peng Li 2020-3-27

在 MATLAB Online 中打开

function y = test1(P_batt, SOC_a, E_0, t)
for i=1:1439
  
   
while i>=t
        while SOC_a(i) <= 0.5
            SOC_a(i+1) = SOC_a(i) + 1/(E_0) * P_batt/60; 
            return
        end
end 
end
y = SOC_a(end);
end

Sabine Merzoug 2020-3-28

在 MATLAB Online 中打开

Ok, but I want SOC_a to change for every new t from 1 to 1440. If I write it like this, I get that the index exceeds matrix dimensions in the function.

SOC_a= zeros(1,1440);
P_batt=50;
E_0=1000;
for t=1:1440
    
SOC_a(1)=0.2;
[y] = test1(P_batt, SOC_a(t),E_0,t);
SOC_a(t)=y;
end 
disp(SOC_a)

请先登录，再进行评论。

How to add values into a vector with for loop in a function

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

回答（1 个）

3 个评论
显示 1更早的评论隐藏 1更早的评论

另请参阅

类别

标签

Community Treasure Hunt

How to add values into a vector with for loop in a function

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

回答（1 个）

3 个评论 显示 1更早的评论隐藏 1更早的评论

另请参阅

类别

标签

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

3 个评论
显示 1更早的评论隐藏 1更早的评论