Does anyone know how to carry out the same MATLAB function [F,E] = log2(X)
in R?
[F,E] = log2(X) returns arrays F and E such that X=F*2^E. The values in F are typically in the range 0.5 <= abs(F) < 1.
See https://www.mathworks.com/help/matlab/ref/log2.html
For example in MATLAB,
[F,E] = log2(15)
F =
0.9375
E =
4
Thus,
F*2^E = 15
You'll need to calculate them manually. I don't think there's a builtin to extract them. Try this:
x<-15
E <- ifelse(x == 0, 0, floor(log2(abs(x)))+1 )
F<-x/2^E
Edit: Made the change for the case of x==0.
I'm not entirely sure what you're asking but log2
gives you the logarithm base 2 in R. For example
log2(2);
#[1] 1
log2(2^10)
#[1] 10
2^(log2(10))
#[1] 10
See ?log
for details.
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