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rieee-754

R byte vector to iee 754 float

In R, how do I convert a byte vector to IEEE-754 float (e.g. [0, 108, 4, 71] to 33900.0)?

In Ruby, I would do 

[1191472128].pack("L").unpack("f") ==> 33900.0

I have tried the pack library: unpack("f", pack("V", 1191472128)), but it returns 32795.06.

Solution

  • With using the package mcga you can convert double types to byte vectors and vice versa:

    > DoubleToBytes(33900.0)
[1]   0   0   0   0 128 141 224  64

    and

    > BytesToDouble(c(0,0,0,0,128,141,224,64))
[1] 33900

    are the examples.