pandas change value to nan

Asked Dec 16 '18 at 23:26

Active Dec 16 '18 at 23:26

Viewed 58 times

I'm using a pandas dataframe which looks something like this:

and I need to change all the values of -999 to Nan for processing. The docs, and the following articles,

describe how to change NaNs to values, but I need to go the other way. What method can I use to achieve this?

I've also tried sources.replace(-999, np.nan) but this didn't seem to have an effect. What am I doing wrong?

asked Dec 16 '18 at 23:26

Jim421616

You need to assign the result back or use sources.replace(-999, np.nan, inplace = True) – Vaishali Dec 16 '18 at 23:32
Whoops, thank you for pointing that out. A simple mistake. – Jim421616 Dec 16 '18 at 23:52

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