r - Taking inverse of certain rows in dataframe -

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i have dataframe of market trades , need multiply put returns -1. have code that, can't figure out how assign without affecting calls.

input df:

         date  type  stock_open  stock_close  stock_roi 0  2016-04-27  call        5.33         4.80  -0.099437 1  2016-06-03   put        4.80         4.52  -0.058333 2  2016-06-30  call        4.52         5.29   0.170354 3  2016-07-21   put        5.29         4.84  -0.085066 4  2016-08-08  call        4.84         5.35   0.105372 5  2016-08-25   put        5.35         4.65  -0.130841 6  2016-09-21  call        4.65         5.07   0.090323 7  2016-10-13   put        5.07         4.12  -0.187377 8  2016-11-04  call        4.12         4.79   0.162621

code:

flipped_puts = trades_df[trades_df['type']=='put']['stock_roi']*-1 trades_df['stock_roi'] = flipped_puts

output of flipped puts:

1    0.058333 3    0.085066 5    0.130841 7    0.187377

output of original df:

         date  type  stock_open  stock_close  stock_roi 0  2016-04-27  call        5.33         4.80        nan 1  2016-06-03   put        4.80         4.52   0.058333 2  2016-06-30  call        4.52         5.29        nan 3  2016-07-21   put        5.29         4.84   0.085066 4  2016-08-08  call        4.84         5.35        nan 5  2016-08-25   put        5.35         4.65   0.130841 6  2016-09-21  call        4.65         5.07        nan 7  2016-10-13   put        5.07         4.12   0.187377 8  2016-11-04  call        4.12         4.79        nan

try

trades_df.loc[trades_df.type.eq('put'), 'stock_roi'] *= -1

or

trades_df.update(trades_df.query('type == "put"').stock_roi.mul(-1))

both give you

trades_df

enter image description here


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