Loop

[Anonymous]

With i=(nell/2+2):nell+1

i =6 7 8 9

in following loop
for i=(nell/2+2):nell+1
NN(i)=0;
for j=(nelw/2+1):nelw+1

NNP(i)=NN(i)+Y(j)*probxy(i,j)*b
end
end
X1=(1:a:4);
figure(2)
plot(X1,NNP);
I should get only 4 value of NNP
But I am getting 11 value…..I am not able to understand th reason …Please guide

[cKParticipant]

You might be having an older variable NNP already in workspace before you begin this loop. If the older variable is say 1×11 vector, the first 4 values will be overwritten with your loop, but the rest of the elements 5-11 will remain and the length of the array is still 1×11. You should clear and initialise the variables you plan to create inside loops.

[Anonymous]

@cK said:

You might be having an older variable NNP already in workspace before you begin this loop. If the older variable is say 1×11 vector, the first 4 values will be overwritten with your loop, but the rest of the elements 5-11 will remain and the length of the array is still 1×11. You should clear and initialise the variables you plan to create inside loops.

Yes! earlier variable N was repeated but I have checked carefully……not the case with variable NNP. It seem some mistake in loop only.In matrix probxy I need to select right half column one by one and calculate level crossing. I should get 4 such value for this case ,but
NNP =

0 0 0 0 0 0 0 -0.0020
??? Error using ==> plot
Vectors must be the same lengths.

Error in ==> fem_optimized at 384
plot(X1,NNP);

[cKParticipant]

Oops, you are using i as index, where i runs from 6 to 9. That means you are creating NNP(6), NNP(7)..NNP(9). You hence have 9 elements in NNP. When you do A(100) = 1, A(1)…A(99) will be initialised to zeros and A will be 1×100 vector. Better use another index instead of i, e.g. idx = 1:length(i), and use idx as loop index.

[Author]

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