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with this code, im trying to display the results for (y0-y100). But im always getting the error. need help on this.thanks

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Kugen Raj
Kugen Raj 2011-12-4
for k=1:100
y(k)=y(k-1)*k;
y(0)=1;
end
??? Attempted to access y(0); index must be a positive integer or logical.

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回答（1 个）

David Young
David Young 2011-12-4
In MATLAB, indices start from 1. The first time through the loop, the code tries to do this:
y(1) = y(0)*1;
but there is no element y(0).
What you probably need to do is to put the line
y(1) = 1;
before the loop, and start the loop at k=2 by writing "for k=2:100".
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Walter Roberson
Walter Roberson 2011-12-4
You need to go to 101 and you need
y(k) = y(k-1)*(k-1);
The code (explicitly or implicitly) calculates 0! to 100! which is 101 values. If you do not use *(k-1) and do not go to 101, you have the effect of calculating 1! to 100! which is 100 values.

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