How to create a vector with for loop?

Question

Hamzah Faraj 2020-5-14

0
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https://ww2.mathworks.cn/matlabcentral/answers/525328-how-to-create-a-vector-with-for-loop

编辑： Hamzah Faraj 2020-5-14

Hello,

I am trying to devide the values between a vector elements by 0.1. Assume x = [1,4,-1,5,0,-2]. I want to create a vector with that:

If x(k) > x(k-1) : increment by 0.1 ----> x(k-1) : 0.1 : x(k)

if x(k) < x(k-1) : decrement by 0.1 ----> x(k-1) : -0.1 : x(k)

In my attempt, it only shows the results between last two elements (0 and -2), but I need the values for the elements.

Any help is appreciated. Thanks!

x = [1,4,-1,5,0,2];
for k=2:length(x)
 
    if x(k) > x(k-1)
        vt = v(k-1):0.1:v(k);
    else
        vt = x(k-1):-0.1:x(k);
    end
end

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Answer 1

Geoff Hayes 2020-5-14

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在 MATLAB Online 中打开

Hamzah - on each subsequent iteration of your loop, you are overwriting the data from the previous iteration since you are setting vt to something new. You need to concatenate the new data with the previous data so that you don't lose anything. Try the following:

x = [1,4,-1,5,0,2];
vt = [];
for k=2:length(x)
    if x(k) > x(k-1)
        vt = [vt x(k-1):0.1:x(k)];
    else
        vt = [vt x(k-1):-0.1:x(k)];
    end
end