MATLAB: Invalid array indexing. column 19.help

indexing

R02(i) = (beta1.*epsilon(i)(xi2(i)((1-epsilon(i)).*Q2(i) + rho(i).*Q1(i))))./(varphi(i).*Q1(i).*Q2(i).*Q3(i).*(1 - Phi1));

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epsilon(i)(xi2(i)((1-epsilon(i))

is not allowed in Matlab, do you mean?:

epsilon(i)*(xi2(i)*((1-epsilon(i))

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MATLAB: Help with matrix indexing.

You seem to be treating this in a sorta symbolic way trying to tell MATLAB that the c(i-1) element is really element c(16,0) when i==1. However, what you have done in practice is an assignment statement,

>>  c(0,:) = c(16,:)

which is not valid because you can't assign to element c(0,:).

I think the easiest way to accomplish what you want is to use the CIRCSHIFT command:

>> index = (1:16)'
>> down_one_index = circshift(index,1)

The guts of CIRCSHIFT, in your case, is the following use of MOD:

>> mod((0:15)-1, 16)+1

This creates the periodic indexing that you want. Hope that helps.

the cyclist

MATLAB: Index exceeds the number of array elements (1) error on line 10

    if P3(i)>P2(i); Q3(i) = (P3(i)-P2(i))/R2;
        else Q3 = 0;
    end

The else of that overwrites all of Q3 with a scalar value. It would no longer have length greater than 1 for the Q3(i) reference further down.

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MATLAB: Help with matrix indexing.

MATLAB: Index exceeds the number of array elements (1) error on line 10

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