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Hey all newbie to matlab, was wondering what I can do to fix the "for loop" code I have below, I am getting the "array indices must be positive integers." Thanks in advance!

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Brody Slusar
Brody Slusar 2021-9-29
回答： DGM 2021-9-29
clear;
counter = 0;
for t = -15:0.2:15;
y(t) = counter;
counter = ((t^4)-(3*t^2)+(2*t)-1)
end;

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DGM
DGM 2021-9-29
Try this:
counter = 0;
t = -15:0.2:15;
y = zeros(size(t));
for k = 1:numel(t)
y(k) = counter;
counter = ((t(k)^4)-(3*t(k)^2)+(2*t(k))-1);
end
That said, you don't really need a loop to do this:
y2 = (t.^4 - 3*t.^2 + 2*t - 1);
y2 = [0 y2(1:end-1)];
immse(y,y2) % show that the two results are identical

更多回答（1 个）

Kevin Holly
Kevin Holly 2021-9-29
Ran in:
clear;
counter = 0;
y=[];
for t = -15:0.2:15;
y = [y; counter];
counter = ((t^4)-(3*t^2)+(2*t)-1);
end
The indices for the array cannot be a negative number and has to be an integer. You cannot have an array with a value indexed at let's say 1.5.
Let's look at the first 3 values in the array
y(1:3)
ans = 3×1
1.0e+04 * 0 4.9919 4.7291
I can view the first value as such:
y(1)
ans = 0
Let's look at the third
y(3)
ans = 4.7291e+04
I cannot view a negative nor integer

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