Hello, everyone,

There's a problem about zero in R and I really need your help.

 

I have a vector shown as x=c(0.1819711,0.4811463,0.1935151,0.1433675),

The sum of this vector is shown as 1 in R, but when I type 1-sum(x), the
value is not zero, but -2.220446e-16.

I can accept that this value is quite small and could be seen as zero, but
there would be a problem when it's not really zero but a negative value in
my algorithm.

 

Therefore I would like to know that how could it be avoid.

One way I think is to define the value 1-sum(x) as zero when it is smaller
than a particular value, but the particular value is not be set yet.

I would like to know more about the definition of the shown zero in R.

 

Thank you so much.

 

Yen


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