How do I transform a matrix into a vector?
Question:
I have this matrix that contains x number of products and feedback rankings of 5 different categories.
This matrix is represented in a Pandas DataFrame like this:
index
Bad ratings
Slightly bad ratings
Neutral ratings
Slightly good ratings
Good ratings
product1
9
0
0
0
0
product2
0
2
2
2
0
product3
2
1
3
0
0
product4
1
1
1
1
1
product5
0
0
0
4
4
How do I transform a matrix such as this to show the overall rank of each product?
E.g. like this where 0 is the worst and 9 is the best:
index
Overall ratings
product1
1
product2
3
product3
2
product4
3
product5
4
Answers:
Something like this?
df['Bad ratings'] *= -2
df['Slightly bad ratings'] *= -1
df['Good ratings'] *= 2
df.set_index('index').sum(1).rank().sort_values()
Output:
index
product1 1.0
product3 2.0
product4 3.0
product2 4.0
product5 5.0
I have this matrix that contains x number of products and feedback rankings of 5 different categories.
This matrix is represented in a Pandas DataFrame like this:
| index | Bad ratings | Slightly bad ratings | Neutral ratings | Slightly good ratings | Good ratings |
|---|---|---|---|---|---|
| product1 | 9 | 0 | 0 | 0 | 0 |
| product2 | 0 | 2 | 2 | 2 | 0 |
| product3 | 2 | 1 | 3 | 0 | 0 |
| product4 | 1 | 1 | 1 | 1 | 1 |
| product5 | 0 | 0 | 0 | 4 | 4 |
How do I transform a matrix such as this to show the overall rank of each product?
E.g. like this where 0 is the worst and 9 is the best:
| index | Overall ratings |
|---|---|
| product1 | 1 |
| product2 | 3 |
| product3 | 2 |
| product4 | 3 |
| product5 | 4 |
Something like this?
df['Bad ratings'] *= -2
df['Slightly bad ratings'] *= -1
df['Good ratings'] *= 2
df.set_index('index').sum(1).rank().sort_values()
Output:
index
product1 1.0
product3 2.0
product4 3.0
product2 4.0
product5 5.0