I think this should be a simple problem, but I can not find a solution
Within a subset of rows in a dataframe, I need to decrease the value of each item in column 1. I have tried many approaches, but the values remain unchanged. After another entry on SO, I tried
def minus1 (x): x = x-1 returns x plage [pledges.Source == 'M0607']. DayOFDrive = Pledge [pledges.Source == 'M0607']. DayOFDrive.map (minus1) when I wrote
pledge [pledges.Source == 'M0607']. DayOFDrive To check this, the original unchanged data came back. I have also tried pledges.Source == 'M0607']. DayOFDrive = Pledge [pledges.Source == 'M0607']. DayOFDrive-1 What does nothing
How can I reduce all values of 1 in a column for a subset of rows?
If it returns the data that you want to modify:
< Code> pledges [pledges.Source == 'M0607']. DayOFDrive Try again to modify it:
Pledge [pledges.Source == 'M0607']. DayOFDrive - = 1
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