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Defining a variable in specific nodes

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m m 2019-5-6

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关闭： MATLAB Answer Bot 2021-8-20

Hi,

I need to define a variable B(j)) in the 1/2 3/2 5/2.... . e.g i have the variables A(i) and B(j). So the loops are( for i =2:N and j=2:N) .

And B(j)=A(i+1)-A(i)

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Adam Danz 2019-5-6

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编辑：Adam Danz 2019-5-6

" I need to define a variable B(j)) in the 1/2 3/2 5/2.... "

I don't understand.

Try to explain again.

m m 2019-5-6

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I am trying to calculate the potentiel A(i), after that i want to calculate the electric field B(j) whitch related with the potentiel by :

B(j)=(A(i+1)-A(i) )/dx.

Knowing that j=i+12

So if i use this relation B(j)=(A(i+1)-A(i) )/dx. How can i inmplement this in matlab??

Adam Danz 2019-5-6

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在 MATLAB Online 中打开

"I am trying to calculate the potentiel A(i)"

I don't know what this means.

"after that i want to calculate the electric field B(j) whitch related with the potentiel by : B(j)=(A(i+1)-A(i) )/dx Knowing that j=i+12"

Something along these lines, perhaps?

for i = __ : __ % ???  
    for j = 1:12
        B(j) = (A(i+1)-A(i) )/dx
    end
end

This can probably be written without for-loops but the concept is still unclear to me.

m m 2019-5-6

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N=10;

for i = 2 : N-1%

for j = ___:___ ??

B(j) = (A(i+1)-A(i) )/dx

end

the loop for j starts from what in this case?

Adam Danz 2019-5-6

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编辑：Adam Danz 2019-5-6

在 MATLAB Online 中打开

Then the j-loop might be

for j = i:i=12
end

Im basing this off of your info "Knowing that j=i+12"

Or perhaps you don't need a 2nd loop if j is always equal to i+12. This might be the case!

m m 2019-5-6

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i'm sorry j=i+1/2 (not j=i+12)

Adam Danz 2019-5-6

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Well then I'm not sure what's going on because loops require integer increments.

m m 2019-5-6

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thank you

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Defining a variable in specific nodes

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