[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Octave criterion for matrix singularity
From: |
Carlo De Falco |
Subject: |
Re: Octave criterion for matrix singularity |
Date: |
Tue, 26 Feb 2019 13:51:25 +0000 |
> On 26 Feb 2019, at 14:21, mabalenk <address@hidden> wrote:
>
> Yes, it does help. Thank you. But I don't understand, where is the division
> by 2 hidden. It seems to me, that rcond is compared to eps, the machine
> precision.
Try by yourself :
>> eps
ans = 2.2204e-16
>> 1 + eps(1) == 1
ans = 0
>> 1 + eps(1)/2 == 1
ans = 1
or read the manual :
>> help eps
....
More precisely, 'eps' is the relative spacing between any two
adjacent numbers in the machine's floating point system. This
number is obviously system dependent. On machines that support
IEEE floating point arithmetic, 'eps' is approximately 2.2204e-16
for double precision and 1.1921e-07 for single precision.
....
HTH,
c.