python numpy machine epsilon

Question

I am trying to understand what is machine epsilon  According to the Wikipedia  it can be calculated as follows   def machineEpsilon func float       machine epsilon   func 1      while func 1  func machine epsilon     func 1           machine epsilon last   machine epsilon         machine epsilon   func machine epsilon    func 2      return machine epsilon last   However  it is suitable only for double precision numbers  I am interested in modifying it to support also single precision numbers  I read that numpy can be used  particularly numpy float32 class  Can anybody help with modifying the function

User · Answer

Another easy way to get epsilon is   In  1   7  3 - 4  3 -1 Out 1   2 220446049250313e-16

User · Answer

It will already work  as David pointed out    gt  gt  gt  def machineEpsilon func float           machine epsilon   func 1          while func 1  func machine epsilon     func 1               machine epsilon last   machine epsilon             machine epsilon   func machine epsilon    func 2          return machine epsilon last       gt  gt  gt  machineEpsilon float  2 220446049250313e-16  gt  gt  gt  import numpy  gt  gt  gt  machineEpsilon numpy float64  2 2204460492503131e-16  gt  gt  gt  machineEpsilon numpy float32  1 1920929e-07

User · Answer

An easier way to get the machine epsilon for a given float type is to use np finfo     print np finfo float  eps    2 22044604925e-16  print np finfo np float32  eps    1 19209e-07

[python] python numpy machine epsilon

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