calculation of coordinates of the sum of values ​​greater than 5

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Lev Mihailov
Lev Mihailov 2020-2-14
评论： Lev Mihailov 2020-2-14
there is a vector of large length, here is a small part of it F1 = [2.5 2.5 3.5 1 1 5.2 11.4 4 4 5.2 2 2 6] I need to get the coordinate values ​​in this vector of all more than 5. I have a calculation code, but the F1 vector is too big and it takes a lot of time. Help me optimize the code.
ps. I specify all dimensions and create separately a region of zeros for all values
F1=[2.5 2.5 3.5 1 1 5.2 11.4 4 4 5.2 2 2 6]
Fzero=0;
Elemets=0;
j=0;
for i=1:length(F1)
Fzero=Fzero+F1(i);
Elemets=Elemets+1;
if Fzero>=5
j=j+1;
n(j)=Elemets;
psk(j)=Fzero;
Fzero=0;
Elemets=0;
end
end
% n =[2 3 1 1 2 1 3] % n i need to get

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回答（1 个）

Rohan Kale
Rohan Kale 2020-2-14
In my understanding you are trying to find the indices of values that are greater than 5. You can use the find function to actually optimize your code.
indices = find(F1 > 5);
That should solve your issue. I think the doc page on find will help you
https://www.mathworks.com/help/matlab/ref/find.html
  1 个评论
Lev Mihailov
Lev Mihailov 2020-2-14
This is the problem, I need exactly the sum of the elements greater than 5
indices = find(F1 > 5);
indices=[6 7 10 13]
%and I need to follow the example
F1=[2.5 2.5 3.5 1 1 5.2 11.4 4 4 5.2 2 2 6]
n(1)=2.5+2.5=5 ; % n(1)=2
n2(2)=3.5+1+1>5 ; % n(2)=3
...
I did not find a team in the matlab that could do this automatically

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