Replace 1s in one hot columns with values from another column











up vote
10
down vote

favorite
1












I have a data frame that looks like this:



df = pd.DataFrame({"value": [4, 5, 3], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]})
df

value item1 item2 item3
0 4 0 1 0
1 5 1 0 0
2 3 0 0 1


Basically what I want to do is replace the value of the one hot encoded elements with the value from the "value" column and then delete the "value" column. The resulting data frame should be like this:



df_out = pd.DataFrame({"item1": [0, 5, 0], "item2": [4, 0, 0], "item3": [0, 0, 3]})

item1 item2 item3
0 0 4 0
1 5 0 0
2 0 0 3









share|improve this question
























  • i think this can be solved if you just use df["columNameToReplace"] = df["value"] and then delete the value from the dataframe ?
    – Vaibhav gusain
    Dec 5 at 12:47

















up vote
10
down vote

favorite
1












I have a data frame that looks like this:



df = pd.DataFrame({"value": [4, 5, 3], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]})
df

value item1 item2 item3
0 4 0 1 0
1 5 1 0 0
2 3 0 0 1


Basically what I want to do is replace the value of the one hot encoded elements with the value from the "value" column and then delete the "value" column. The resulting data frame should be like this:



df_out = pd.DataFrame({"item1": [0, 5, 0], "item2": [4, 0, 0], "item3": [0, 0, 3]})

item1 item2 item3
0 0 4 0
1 5 0 0
2 0 0 3









share|improve this question
























  • i think this can be solved if you just use df["columNameToReplace"] = df["value"] and then delete the value from the dataframe ?
    – Vaibhav gusain
    Dec 5 at 12:47















up vote
10
down vote

favorite
1









up vote
10
down vote

favorite
1






1





I have a data frame that looks like this:



df = pd.DataFrame({"value": [4, 5, 3], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]})
df

value item1 item2 item3
0 4 0 1 0
1 5 1 0 0
2 3 0 0 1


Basically what I want to do is replace the value of the one hot encoded elements with the value from the "value" column and then delete the "value" column. The resulting data frame should be like this:



df_out = pd.DataFrame({"item1": [0, 5, 0], "item2": [4, 0, 0], "item3": [0, 0, 3]})

item1 item2 item3
0 0 4 0
1 5 0 0
2 0 0 3









share|improve this question















I have a data frame that looks like this:



df = pd.DataFrame({"value": [4, 5, 3], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]})
df

value item1 item2 item3
0 4 0 1 0
1 5 1 0 0
2 3 0 0 1


Basically what I want to do is replace the value of the one hot encoded elements with the value from the "value" column and then delete the "value" column. The resulting data frame should be like this:



df_out = pd.DataFrame({"item1": [0, 5, 0], "item2": [4, 0, 0], "item3": [0, 0, 3]})

item1 item2 item3
0 0 4 0
1 5 0 0
2 0 0 3






python pandas dataframe






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share|improve this question













share|improve this question




share|improve this question








edited Dec 5 at 12:55









coldspeed

115k18105182




115k18105182










asked Dec 5 at 12:41









Gorjan Radevski

705




705












  • i think this can be solved if you just use df["columNameToReplace"] = df["value"] and then delete the value from the dataframe ?
    – Vaibhav gusain
    Dec 5 at 12:47




















  • i think this can be solved if you just use df["columNameToReplace"] = df["value"] and then delete the value from the dataframe ?
    – Vaibhav gusain
    Dec 5 at 12:47


















i think this can be solved if you just use df["columNameToReplace"] = df["value"] and then delete the value from the dataframe ?
– Vaibhav gusain
Dec 5 at 12:47






i think this can be solved if you just use df["columNameToReplace"] = df["value"] and then delete the value from the dataframe ?
– Vaibhav gusain
Dec 5 at 12:47














4 Answers
4






active

oldest

votes

















up vote
14
down vote



accepted










Why not just multiply?



df.pop('value').values * df

item1 item2 item3
0 0 5 0
1 4 0 0
2 0 0 3


DataFrame.pop has the nice effect of in-place removing and returning a column, so you can do this in a single step.





if the "item_*" columns have anything besides 1 in them, then you can multiply with bools:



df.pop('value').values * df.astype(bool)

item1 item2 item3
0 0 5 0
1 4 0 0
2 0 0 3




If your DataFrame has other columns, then do this:



df
value name item1 item2 item3
0 4 John 0 1 0
1 5 Mike 1 0 0
2 3 Stan 0 0 1

# cols = df.columns[df.columns.str.startswith('item')]
cols = df.filter(like='item').columns
df[cols] = df.pop('value').values * df[cols]

df
name item1 item2 item3
0 John 0 5 0
1 Mike 4 0 0
2 Stan 0 0 3





share|improve this answer



















  • 4




    Most elegant answer so far
    – horro
    Dec 5 at 12:53










  • I like it but I should have been more specific with my question. Here is how my data frame actually looks like: df_in = pd.DataFrame({"value": [4, 5, 3], "name": ["John", "Mike", "Stan"], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]}) And the output df should be: df_out = pd.DataFrame({"name": ["John", "Mike", "Stan"], "item1": [0, 4, 0], "item2": [5, 0, 0], "item3": [0, 0, 3]})
    – Gorjan Radevski
    Dec 5 at 13:08












  • @GorjanRadevski Let me know if the edit does it for you.
    – coldspeed
    Dec 5 at 13:11






  • 1




    I feel so stupid after watching this answer :}
    – Mohit Motwani
    Dec 5 at 13:28






  • 1




    That works! I have no idea why on the sample data frame it worked without the addition. Thank you!
    – Gorjan Radevski
    Dec 5 at 13:46


















up vote
1
down vote













You could do something like:



df = pd.DataFrame([df['value']*df['item1'],df['value']*df['item2'],df['value']*df['item3']])
df.columns = ['item1','item2','item3']


EDIT:
As this answer will not scale well to many columns as @coldspeed comments, it should be done iterating a loop:



 cols = ['item1','item2','item3']
for c in cols:
df[c] *= df['value']
df.drop('value',axis=1,inplace=True)





share|improve this answer



















  • 1




    This won't scale well to many columns.
    – coldspeed
    Dec 5 at 12:52






  • 1




    Fair point, it should be done iterating a loop
    – horro
    Dec 5 at 12:53


















up vote
0
down vote













You need:



col = ['item1','item2','item3']

for c in col:
df[c] = df[c] * df['value']

df.drop(['value'],1,inplace=True)





share|improve this answer



















  • 1




    Surely you can think of something better than iteration...
    – coldspeed
    Dec 5 at 12:52


















up vote
0
down vote













You can use np.where:



items = ['item1', 'item2', 'item3']
for item in items:
df[item] = np.where(df[item]==1, df['value'], 0)
df.drop(columns = ['value'], inplace =True)
df
item1 item2 item3
0 0 4 0
1 5 0 0
2 0 0 3





share|improve this answer



















  • 1




    Again, can you think of something better than iteration? Don't forget to drop the "value" column once done.
    – coldspeed
    Dec 5 at 12:53










  • @coldspeed You're right
    – Mohit Motwani
    Dec 5 at 12:56











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4 Answers
4






active

oldest

votes








4 Answers
4






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
14
down vote



accepted










Why not just multiply?



df.pop('value').values * df

item1 item2 item3
0 0 5 0
1 4 0 0
2 0 0 3


DataFrame.pop has the nice effect of in-place removing and returning a column, so you can do this in a single step.





if the "item_*" columns have anything besides 1 in them, then you can multiply with bools:



df.pop('value').values * df.astype(bool)

item1 item2 item3
0 0 5 0
1 4 0 0
2 0 0 3




If your DataFrame has other columns, then do this:



df
value name item1 item2 item3
0 4 John 0 1 0
1 5 Mike 1 0 0
2 3 Stan 0 0 1

# cols = df.columns[df.columns.str.startswith('item')]
cols = df.filter(like='item').columns
df[cols] = df.pop('value').values * df[cols]

df
name item1 item2 item3
0 John 0 5 0
1 Mike 4 0 0
2 Stan 0 0 3





share|improve this answer



















  • 4




    Most elegant answer so far
    – horro
    Dec 5 at 12:53










  • I like it but I should have been more specific with my question. Here is how my data frame actually looks like: df_in = pd.DataFrame({"value": [4, 5, 3], "name": ["John", "Mike", "Stan"], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]}) And the output df should be: df_out = pd.DataFrame({"name": ["John", "Mike", "Stan"], "item1": [0, 4, 0], "item2": [5, 0, 0], "item3": [0, 0, 3]})
    – Gorjan Radevski
    Dec 5 at 13:08












  • @GorjanRadevski Let me know if the edit does it for you.
    – coldspeed
    Dec 5 at 13:11






  • 1




    I feel so stupid after watching this answer :}
    – Mohit Motwani
    Dec 5 at 13:28






  • 1




    That works! I have no idea why on the sample data frame it worked without the addition. Thank you!
    – Gorjan Radevski
    Dec 5 at 13:46















up vote
14
down vote



accepted










Why not just multiply?



df.pop('value').values * df

item1 item2 item3
0 0 5 0
1 4 0 0
2 0 0 3


DataFrame.pop has the nice effect of in-place removing and returning a column, so you can do this in a single step.





if the "item_*" columns have anything besides 1 in them, then you can multiply with bools:



df.pop('value').values * df.astype(bool)

item1 item2 item3
0 0 5 0
1 4 0 0
2 0 0 3




If your DataFrame has other columns, then do this:



df
value name item1 item2 item3
0 4 John 0 1 0
1 5 Mike 1 0 0
2 3 Stan 0 0 1

# cols = df.columns[df.columns.str.startswith('item')]
cols = df.filter(like='item').columns
df[cols] = df.pop('value').values * df[cols]

df
name item1 item2 item3
0 John 0 5 0
1 Mike 4 0 0
2 Stan 0 0 3





share|improve this answer



















  • 4




    Most elegant answer so far
    – horro
    Dec 5 at 12:53










  • I like it but I should have been more specific with my question. Here is how my data frame actually looks like: df_in = pd.DataFrame({"value": [4, 5, 3], "name": ["John", "Mike", "Stan"], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]}) And the output df should be: df_out = pd.DataFrame({"name": ["John", "Mike", "Stan"], "item1": [0, 4, 0], "item2": [5, 0, 0], "item3": [0, 0, 3]})
    – Gorjan Radevski
    Dec 5 at 13:08












  • @GorjanRadevski Let me know if the edit does it for you.
    – coldspeed
    Dec 5 at 13:11






  • 1




    I feel so stupid after watching this answer :}
    – Mohit Motwani
    Dec 5 at 13:28






  • 1




    That works! I have no idea why on the sample data frame it worked without the addition. Thank you!
    – Gorjan Radevski
    Dec 5 at 13:46













up vote
14
down vote



accepted







up vote
14
down vote



accepted






Why not just multiply?



df.pop('value').values * df

item1 item2 item3
0 0 5 0
1 4 0 0
2 0 0 3


DataFrame.pop has the nice effect of in-place removing and returning a column, so you can do this in a single step.





if the "item_*" columns have anything besides 1 in them, then you can multiply with bools:



df.pop('value').values * df.astype(bool)

item1 item2 item3
0 0 5 0
1 4 0 0
2 0 0 3




If your DataFrame has other columns, then do this:



df
value name item1 item2 item3
0 4 John 0 1 0
1 5 Mike 1 0 0
2 3 Stan 0 0 1

# cols = df.columns[df.columns.str.startswith('item')]
cols = df.filter(like='item').columns
df[cols] = df.pop('value').values * df[cols]

df
name item1 item2 item3
0 John 0 5 0
1 Mike 4 0 0
2 Stan 0 0 3





share|improve this answer














Why not just multiply?



df.pop('value').values * df

item1 item2 item3
0 0 5 0
1 4 0 0
2 0 0 3


DataFrame.pop has the nice effect of in-place removing and returning a column, so you can do this in a single step.





if the "item_*" columns have anything besides 1 in them, then you can multiply with bools:



df.pop('value').values * df.astype(bool)

item1 item2 item3
0 0 5 0
1 4 0 0
2 0 0 3




If your DataFrame has other columns, then do this:



df
value name item1 item2 item3
0 4 John 0 1 0
1 5 Mike 1 0 0
2 3 Stan 0 0 1

# cols = df.columns[df.columns.str.startswith('item')]
cols = df.filter(like='item').columns
df[cols] = df.pop('value').values * df[cols]

df
name item1 item2 item3
0 John 0 5 0
1 Mike 4 0 0
2 Stan 0 0 3






share|improve this answer














share|improve this answer



share|improve this answer








edited Dec 5 at 13:09

























answered Dec 5 at 12:51









coldspeed

115k18105182




115k18105182








  • 4




    Most elegant answer so far
    – horro
    Dec 5 at 12:53










  • I like it but I should have been more specific with my question. Here is how my data frame actually looks like: df_in = pd.DataFrame({"value": [4, 5, 3], "name": ["John", "Mike", "Stan"], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]}) And the output df should be: df_out = pd.DataFrame({"name": ["John", "Mike", "Stan"], "item1": [0, 4, 0], "item2": [5, 0, 0], "item3": [0, 0, 3]})
    – Gorjan Radevski
    Dec 5 at 13:08












  • @GorjanRadevski Let me know if the edit does it for you.
    – coldspeed
    Dec 5 at 13:11






  • 1




    I feel so stupid after watching this answer :}
    – Mohit Motwani
    Dec 5 at 13:28






  • 1




    That works! I have no idea why on the sample data frame it worked without the addition. Thank you!
    – Gorjan Radevski
    Dec 5 at 13:46














  • 4




    Most elegant answer so far
    – horro
    Dec 5 at 12:53










  • I like it but I should have been more specific with my question. Here is how my data frame actually looks like: df_in = pd.DataFrame({"value": [4, 5, 3], "name": ["John", "Mike", "Stan"], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]}) And the output df should be: df_out = pd.DataFrame({"name": ["John", "Mike", "Stan"], "item1": [0, 4, 0], "item2": [5, 0, 0], "item3": [0, 0, 3]})
    – Gorjan Radevski
    Dec 5 at 13:08












  • @GorjanRadevski Let me know if the edit does it for you.
    – coldspeed
    Dec 5 at 13:11






  • 1




    I feel so stupid after watching this answer :}
    – Mohit Motwani
    Dec 5 at 13:28






  • 1




    That works! I have no idea why on the sample data frame it worked without the addition. Thank you!
    – Gorjan Radevski
    Dec 5 at 13:46








4




4




Most elegant answer so far
– horro
Dec 5 at 12:53




Most elegant answer so far
– horro
Dec 5 at 12:53












I like it but I should have been more specific with my question. Here is how my data frame actually looks like: df_in = pd.DataFrame({"value": [4, 5, 3], "name": ["John", "Mike", "Stan"], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]}) And the output df should be: df_out = pd.DataFrame({"name": ["John", "Mike", "Stan"], "item1": [0, 4, 0], "item2": [5, 0, 0], "item3": [0, 0, 3]})
– Gorjan Radevski
Dec 5 at 13:08






I like it but I should have been more specific with my question. Here is how my data frame actually looks like: df_in = pd.DataFrame({"value": [4, 5, 3], "name": ["John", "Mike", "Stan"], "item1": [0, 1, 0], "item2": [1, 0, 0], "item3": [0, 0, 1]}) And the output df should be: df_out = pd.DataFrame({"name": ["John", "Mike", "Stan"], "item1": [0, 4, 0], "item2": [5, 0, 0], "item3": [0, 0, 3]})
– Gorjan Radevski
Dec 5 at 13:08














@GorjanRadevski Let me know if the edit does it for you.
– coldspeed
Dec 5 at 13:11




@GorjanRadevski Let me know if the edit does it for you.
– coldspeed
Dec 5 at 13:11




1




1




I feel so stupid after watching this answer :}
– Mohit Motwani
Dec 5 at 13:28




I feel so stupid after watching this answer :}
– Mohit Motwani
Dec 5 at 13:28




1




1




That works! I have no idea why on the sample data frame it worked without the addition. Thank you!
– Gorjan Radevski
Dec 5 at 13:46




That works! I have no idea why on the sample data frame it worked without the addition. Thank you!
– Gorjan Radevski
Dec 5 at 13:46












up vote
1
down vote













You could do something like:



df = pd.DataFrame([df['value']*df['item1'],df['value']*df['item2'],df['value']*df['item3']])
df.columns = ['item1','item2','item3']


EDIT:
As this answer will not scale well to many columns as @coldspeed comments, it should be done iterating a loop:



 cols = ['item1','item2','item3']
for c in cols:
df[c] *= df['value']
df.drop('value',axis=1,inplace=True)





share|improve this answer



















  • 1




    This won't scale well to many columns.
    – coldspeed
    Dec 5 at 12:52






  • 1




    Fair point, it should be done iterating a loop
    – horro
    Dec 5 at 12:53















up vote
1
down vote













You could do something like:



df = pd.DataFrame([df['value']*df['item1'],df['value']*df['item2'],df['value']*df['item3']])
df.columns = ['item1','item2','item3']


EDIT:
As this answer will not scale well to many columns as @coldspeed comments, it should be done iterating a loop:



 cols = ['item1','item2','item3']
for c in cols:
df[c] *= df['value']
df.drop('value',axis=1,inplace=True)





share|improve this answer



















  • 1




    This won't scale well to many columns.
    – coldspeed
    Dec 5 at 12:52






  • 1




    Fair point, it should be done iterating a loop
    – horro
    Dec 5 at 12:53













up vote
1
down vote










up vote
1
down vote









You could do something like:



df = pd.DataFrame([df['value']*df['item1'],df['value']*df['item2'],df['value']*df['item3']])
df.columns = ['item1','item2','item3']


EDIT:
As this answer will not scale well to many columns as @coldspeed comments, it should be done iterating a loop:



 cols = ['item1','item2','item3']
for c in cols:
df[c] *= df['value']
df.drop('value',axis=1,inplace=True)





share|improve this answer














You could do something like:



df = pd.DataFrame([df['value']*df['item1'],df['value']*df['item2'],df['value']*df['item3']])
df.columns = ['item1','item2','item3']


EDIT:
As this answer will not scale well to many columns as @coldspeed comments, it should be done iterating a loop:



 cols = ['item1','item2','item3']
for c in cols:
df[c] *= df['value']
df.drop('value',axis=1,inplace=True)






share|improve this answer














share|improve this answer



share|improve this answer








edited Dec 5 at 12:57

























answered Dec 5 at 12:50









horro

4681727




4681727








  • 1




    This won't scale well to many columns.
    – coldspeed
    Dec 5 at 12:52






  • 1




    Fair point, it should be done iterating a loop
    – horro
    Dec 5 at 12:53














  • 1




    This won't scale well to many columns.
    – coldspeed
    Dec 5 at 12:52






  • 1




    Fair point, it should be done iterating a loop
    – horro
    Dec 5 at 12:53








1




1




This won't scale well to many columns.
– coldspeed
Dec 5 at 12:52




This won't scale well to many columns.
– coldspeed
Dec 5 at 12:52




1




1




Fair point, it should be done iterating a loop
– horro
Dec 5 at 12:53




Fair point, it should be done iterating a loop
– horro
Dec 5 at 12:53










up vote
0
down vote













You need:



col = ['item1','item2','item3']

for c in col:
df[c] = df[c] * df['value']

df.drop(['value'],1,inplace=True)





share|improve this answer



















  • 1




    Surely you can think of something better than iteration...
    – coldspeed
    Dec 5 at 12:52















up vote
0
down vote













You need:



col = ['item1','item2','item3']

for c in col:
df[c] = df[c] * df['value']

df.drop(['value'],1,inplace=True)





share|improve this answer



















  • 1




    Surely you can think of something better than iteration...
    – coldspeed
    Dec 5 at 12:52













up vote
0
down vote










up vote
0
down vote









You need:



col = ['item1','item2','item3']

for c in col:
df[c] = df[c] * df['value']

df.drop(['value'],1,inplace=True)





share|improve this answer














You need:



col = ['item1','item2','item3']

for c in col:
df[c] = df[c] * df['value']

df.drop(['value'],1,inplace=True)






share|improve this answer














share|improve this answer



share|improve this answer








edited Dec 5 at 12:52

























answered Dec 5 at 12:51









Sociopath

3,36471635




3,36471635








  • 1




    Surely you can think of something better than iteration...
    – coldspeed
    Dec 5 at 12:52














  • 1




    Surely you can think of something better than iteration...
    – coldspeed
    Dec 5 at 12:52








1




1




Surely you can think of something better than iteration...
– coldspeed
Dec 5 at 12:52




Surely you can think of something better than iteration...
– coldspeed
Dec 5 at 12:52










up vote
0
down vote













You can use np.where:



items = ['item1', 'item2', 'item3']
for item in items:
df[item] = np.where(df[item]==1, df['value'], 0)
df.drop(columns = ['value'], inplace =True)
df
item1 item2 item3
0 0 4 0
1 5 0 0
2 0 0 3





share|improve this answer



















  • 1




    Again, can you think of something better than iteration? Don't forget to drop the "value" column once done.
    – coldspeed
    Dec 5 at 12:53










  • @coldspeed You're right
    – Mohit Motwani
    Dec 5 at 12:56















up vote
0
down vote













You can use np.where:



items = ['item1', 'item2', 'item3']
for item in items:
df[item] = np.where(df[item]==1, df['value'], 0)
df.drop(columns = ['value'], inplace =True)
df
item1 item2 item3
0 0 4 0
1 5 0 0
2 0 0 3





share|improve this answer



















  • 1




    Again, can you think of something better than iteration? Don't forget to drop the "value" column once done.
    – coldspeed
    Dec 5 at 12:53










  • @coldspeed You're right
    – Mohit Motwani
    Dec 5 at 12:56













up vote
0
down vote










up vote
0
down vote









You can use np.where:



items = ['item1', 'item2', 'item3']
for item in items:
df[item] = np.where(df[item]==1, df['value'], 0)
df.drop(columns = ['value'], inplace =True)
df
item1 item2 item3
0 0 4 0
1 5 0 0
2 0 0 3





share|improve this answer














You can use np.where:



items = ['item1', 'item2', 'item3']
for item in items:
df[item] = np.where(df[item]==1, df['value'], 0)
df.drop(columns = ['value'], inplace =True)
df
item1 item2 item3
0 0 4 0
1 5 0 0
2 0 0 3






share|improve this answer














share|improve this answer



share|improve this answer








edited Dec 5 at 12:54

























answered Dec 5 at 12:49









Mohit Motwani

8731320




8731320








  • 1




    Again, can you think of something better than iteration? Don't forget to drop the "value" column once done.
    – coldspeed
    Dec 5 at 12:53










  • @coldspeed You're right
    – Mohit Motwani
    Dec 5 at 12:56














  • 1




    Again, can you think of something better than iteration? Don't forget to drop the "value" column once done.
    – coldspeed
    Dec 5 at 12:53










  • @coldspeed You're right
    – Mohit Motwani
    Dec 5 at 12:56








1




1




Again, can you think of something better than iteration? Don't forget to drop the "value" column once done.
– coldspeed
Dec 5 at 12:53




Again, can you think of something better than iteration? Don't forget to drop the "value" column once done.
– coldspeed
Dec 5 at 12:53












@coldspeed You're right
– Mohit Motwani
Dec 5 at 12:56




@coldspeed You're right
– Mohit Motwani
Dec 5 at 12:56


















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