Dear R community,
I am puzzled by the following lines:
> v <- seq(-0.5,0.5,by=0.1)
> v
[1] -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5
> which(v == -0.4)
[1] 2
> which(v == 0)
[1] 6
> which(v == 0.1)
integer(0)
> which(v == 0.2)
integer(0)
> which(v == 0.3)
integer(0)
> which(v == 0.4)
[1] 10
> which(v == 0.5)
[1] 11
Why "which" can only match some of the values in "v"? Are the numbers generated
by "seq" not exact fractional numbers?
Please, help me to understand this.
J
Dr James Foadi PhD
Membrane Protein Laboratory (MPL)
Diamond Light Source Ltd
Diamond House
Harewell Science and Innovation Campus
Chilton, Didcot
Oxfordshire OX11 0DE
Email : james.fo...@diamond.ac.uk
Alt Email: j.fo...@imperial.ac.uk
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