Is it a mistake that the function sum?
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Please see the follow code:
N=3;
sum(sum(eye(N)-ones(N,N)/N))
The MATLAB answer is 3.3307e-16, but the right answer is 0.
But it is true if N is 2, 4, 8 as follows:
N=2;
sum(sum(eye(N)-ones(N,N)/N))
N=4;
sum(sum(eye(N)-ones(N,N)/N))
N=8;
sum(sum(eye(N)-ones(N,N)/N))
These right answers are 0, and the MATLAB answer is 0 too.
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Risposte (1)
James Tursa
il 19 Feb 2020
Modificato: James Tursa
il 19 Feb 2020
Welcome to the world of floating point arithmetic.
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