how can i solve it

Question

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i=1:100;
vx_1(i)=(X1(i)-X1((i)-1))/(t(i)-t((i)-1));          % In general
vx_1(1)= (X1(1)-X1(N-1))/(t(N)-t(N-1));             % for i=1

I get the error: Array indices must be positive integers or logical values.

How can I solve it

it works well when you put i= single digit but does not work for array? eg it works well when i=6

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Rik 2021-8-22

Answer 1

Walter Roberson 2021-8-18

1 个投票

When i is 1 then i-1 is 0, and you would be referring to X1(0) and t(0) .

MATLAB cannot use index 0.