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For loop for the variable and plot

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Auryn_ 2018 年 1 月 26 日

Hello,
I have a matrix of correlations between particles (50 particles). I want to compute the correlations between them, at a distance l. That is, I need to compute V_a,V_(a+l).
If my variable V(a,a,b) where
a=1:50
b=1:100
Now I would like to make a loop and plot the following:
sum_a(V(a,a+l,:))
May I ask you to help me with this loop and the plot?
I have tried with this:
M=50;
for a=1:M
for l=a:M
V(a,l,:)=sum(V(a,a+l,:));
end
end
Unfortunately it doesn't work.

4 件のコメント

Walter Roberson 2018 年 1 月 27 日
Auryn_ 2018 年 1 月 27 日
Hi,
I want
M=\sum_{a}[V(a, a+k,:)]
That is, a sum only in one of the variables.
With k I want to say that I want the interaction V(1,1+k,:) for a=1, etc.
k will go from 0 to 50.
I do not know how to express a and k in the for loop to express the correlations in the whole matrix.
Jan 2018 年 1 月 27 日
@Auryn_: I could try to make a smart guess, what "M=\sum_{a}[V(a, a+k,:)]" might mean. But why do you use a magic notation instead of a syntax the readers can know already? I do not understand the description as text also: "a sum only in one of the variables".
I still do not understand, what you are asking for. "I want the interaction V(1,1+k,:) for a=1, etc." How could I know what "etc." means here? What should be continued how? a=2, or V(2, 1+k, :), or V(1, 2+k, :), or b=1? Please explain it again. Maybe the mathematical notation helps.