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I have the following calculation:

df.t =100.0*((1.25/1023)*df.t-0.5)

Strangely, >>>df doesn't show result, only old values in that column. However, df.t shows calculated values.

So, when I export result to pandas with dfp = df.to_pandas_df(), it gets raw old values as well. And even dfp.t = df.t doesn't help.

So, how do I get calculated values?

Artyrm Sergeev
  • 189
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1 Answers1

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Looking through the vaex docs I found that df.materialize('t', inplace=True) should likely help, but it didn't.

Finally, I tried

df['t'] =100.0*((1.25/1023)*df.t-0.5)

and that worked. I'm not sure why, since I thought df.t and df['t'] to be synonyms.

But anyways, problem is solved.

Artyrm Sergeev
  • 189
  • 7