pythonpython-3.xpython-2.7graphlab

graphlab create dropna does not work

I'm testing graphlabe create with following

sf=gl.SFrame(['t1','t2','','t3','','t4'])
sf.dropna()

accoding to graphlab api

the above should remove empty values(na), but actually it does not, and no errors given either. anyone knows why?

Solution

  • Your '' is either None nor NaN:

    import math

print(None == '')
print(float('nan')=='')
print(math.isnan(float('nan')))

    Output:

    False
False
True

    Doku: dropna()

    Remove missing values from an SFrame. A missing value is either None or NaN.

    Your value '' is neither so it stays.