from double to single precision

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?

Answer 1

[Azzi Abdelmalek]

single(x)

[Beaya]

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]

x = 1 - 3*(4/3 - 1)
a=single(x)
whos x a

and see the difference

[Azzi Abdelmalek]

To get the smallest double and single number

realmin('double')
realmin('single')