Save data every at loop interation

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my code assimilates a value of a signal (matrix A) to a matrix V. Then i want to calcule the medium value of it, save it and then doing again until the i comes to N. somebody could help me?

code:

for i=1:N
    V(i,1)=A(i,1)
    Z=1/N 
    MM=sum(V.*Z)   
end

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Answer 1

Chad Greene 2015-10-16

在 MATLAB Online 中打开

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That depends on what you mean by saving. If you just want it in your workspace,

for k=1:N
    V(i,1)=A(i,1)
    Z=1/N 
    MM(k)=sum(V.*Z)   
end

should do the trick. Notice I changed your i to a k because sometimes Matlab thinks i is the imaginary unit.

If you want to save the data as a .mat file, you can include

save('mydata.mat','Z','MM')

inside the loop, but note that it will overwrite mydata.mat with every iteration of the loop.

If you use the loop I suggested above, preallocate MM by typing

MM = NaN(1,N);

Preallocating before the loop helps speed things up because Matlab just fills in the empty spots instead of resizing the vector with every iteration of the loop.

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Gabriel LimaDuarte 2015-10-19

i will do them both. In workspace and write it in a file. The problem is that at each loop i want to save the value. If a let the code how it is, the MM is the final resuts and not the result at every loop. I tried to put in a vector the values, at every loop, but i dont be able to do it so well...

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Save data every at loop interation

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Save data every at loop interation

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