How to do vector Normalization on columns using python function

Question

The below table having 1000 rows but here let’s consider 3 rows:

Date	B	C
2022-07-24	100	1234
2021-02-01	200	6789
2020-04-30	300	4324

where m is the number of rows in the dataset and n is the number of columns. i varies along rows and j varies along the column.

For each row of Column B and C, the formula I tried applying is:

df['B'] = df1['B']  / np.sqrt((df['B'].pow(2)).sum())
df['C'] = df1['C']  / np.sqrt((df['C'].pow(2)).sum())

I want to write the same code using Python.

Asked By: Madness

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Source

Answer 1

you didn’t specified which cell you want to work on if you need the complete column u have to use Sum fun

Answered By: Mohamed Hassan

Answer 2

If need processing mupliple columns by list use:

cols = ['B','C']
df1[cols] = df1[cols]  / np.sqrt((df1[cols].pow(2)).sum())
print (df1)
         Date         B         C
0  2022-07-24  0.267261  0.151539
1  2021-02-01  0.534522  0.833711
2  2020-04-30  0.801784  0.531001

Answered By: jezrael

How to do vector Normalization on columns using python function

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