from double to single precision

2013 10 27
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I want to calcute this equation x= 3.0*(4.0/3.0-1.0)-1.0 but using single precision instead of double. How do I do switch to single?

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Azzi Abdelmalek
Azzi Abdelmalek 2013-10-27

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single(x)

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Beaya
Beaya 2013-10-27
编辑：Beaya 2013-10-27
I'm confused because this equation in supposed to return the value of machine epsilon, however it only works for double precision. I don't know if I am doing something wrong, this is what I type:
x = 1 - 3*(4/3 - 1)
single(x)
and I still get this result: 2.2204e-16 instead of 1.1921e-07
Azzi Abdelmalek
Azzi Abdelmalek 2013-10-27
x = 1 - 3*(4/3 - 1)
a=single(x)
whos x a
and see the difference
Azzi Abdelmalek
Azzi Abdelmalek 2013-10-27
To get the smallest double and single number
realmin('double')
realmin('single')

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