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To get the percentage of total for each row in Pandas, you can first calculate the sum of each row using the sum function along the columns axis. Then, you can divide each value in the row by the sum and multiply by 100 to get the percentage. This can be done using the div and mul functions in Pandas along with the axis parameter set to 1 for rows. By doing this, you can easily calculate the percentage of total for each row in a Pandas DataFrame.
How do you find the percentage of total for each row in pandas dataframe?
You can find the percentage of total for each row in a pandas DataFrame by first calculating the total sum for each row, and then dividing each value in the row by the total sum to get the percentage.
Here's an example code snippet to achieve this:
import pandas as pd
Creating a sample dataframe
data = {'A': [10, 20, 30], 'B': [5, 10, 15], 'C': [3, 6, 9]}
df = pd.DataFrame(data)
Calculating the total sum for each row
total_sum = df.sum(axis=1)
Calculating the percentage of total for each row
df_percentage = df.div(total_sum, axis=0) * 100
print(df_percentage)
This will output a new DataFrame df_percentage where each value in the original DataFrame has been divided by the total sum of its row and multiplied by 100 to get the percentage of total for each row.
What is the difference between percentage of total and percentage rank in pandas?
In pandas, percentage of total and percentage rank are two different ways to calculate and represent percentages in a dataset.
Percentage of total calculates the percentage of each individual value in a column relative to the total sum of all values in that column. It provides information on the distribution of values in the dataset relative to the total. This can be calculated using the formula:
Percentage of total = (Value / Total sum of column) * 100
Percentage rank, on the other hand, calculates the percentage rank of each individual value in a column based on its position relative to the rest of the values in the column. It provides information on the relative position of each value within the dataset. This can be calculated using the formula:
Percentage rank = (Rank of value / Number of values) * 100
In summary, percentage of total compares values to the total sum of the column, while percentage rank compares values to the position of other values within the column.
How to calculate percentage of total for a specific row in pandas?
You can calculate the percentage of total for a specific row in pandas by dividing the value in that row by the sum of all values in that row, and then multiplying by 100 to get the percentage.
Here's an example:
import pandas as pd
Create a sample dataframe
data = { 'A': [10, 20, 30, 40], 'B': [5, 15, 10, 20] }
df = pd.DataFrame(data)
Calculate the percentage of total for row 2
row_index = 2 row_total = df.iloc[row_index].sum() percentage = (df.iloc[row_index] / row_total) * 100
print(percentage)
In this example, we first calculate the sum of all values in row 2 using df.iloc[row_index].sum(). Then, we divide each value in row 2 by the row total and multiply by 100 to get the percentage. Finally, we print out the calculated percentage.
How to rank rows based on percentage of total values in pandas?
To rank rows based on the percentage of total values in a pandas DataFrame, you can use the rank() function along with apply() to calculate the percentage of total values for each row. Here's an example of how you can do this:
import pandas as pd
Create a sample DataFrame
data = {'A': [10, 20, 30, 40], 'B': [15, 25, 35, 45], 'C': [5, 10, 15, 20]}
df = pd.DataFrame(data)
Calculate the total values for each row
total_values = df.sum(axis=1)
Calculate the percentage of total values for each row
percentage = df.div(total_values, axis=0) * 100
Rank the rows based on the percentage of total values
percentage_rank = percentage.apply(lambda x: x.rank(ascending=False))
print(percentage_rank)
In this code snippet, we first calculate the total values for each row using the sum() function with axis=1. We then calculate the percentage of total values for each row by dividing each value in the DataFrame by the total values and multiplying by 100.
Next, we use the apply() function to apply the rank() function to each row in the DataFrame, ranking the rows based on the percentage of total values. The ascending=False parameter is used to rank rows in descending order.
Finally, we print the ranked DataFrame percentage_rank. This DataFrame will have the rows ranked based on the percentage of total values in each row.