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Programming, r

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Call apply-like function on each row of dataframe with multiple arguments from each row

I have a dataframe with multiple columns. For each row in the dataframe, I want to call a function on the row, and ...

June 3, 2022
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Programming, Python

IT Nursery

How to read a .xlsx file using the pandas Library in iPython?

I want to read a .xlsx file using the Pandas Library of python and port the data to a postgreSQL table. All I ...

June 3, 2022
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Programming, r

IT Nursery

Repeat each row of data.frame the number of times specified in a column

df <- data.frame(var1 = c('a', 'b', 'c'), var2 = c('d', 'e', 'f'), freq = 1:3) What is the simplest way to expand each ...

June 3, 2022
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Programming, r

IT Nursery

Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2

I have the following 2 data.frames: a1 <- data.frame(a = 1:5, b=letters[1:5]) a2 <- data.frame(a = 1:3, b=letters...

June 3, 2022
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Programming, Python

IT Nursery

getting the index of a row in a pandas apply function

I am trying to access the index of a row in a function applied across an entire DataFrame in Pandas. I have something ...

June 3, 2022
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Programming, r

IT Nursery

How to combine multiple conditions to subset a data-frame using “OR”?

I have a data.frame in R. I want to try two different conditions on two different columns, but I want these conditions to ...

June 3, 2022
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Programming, Python

IT Nursery

extract column value based on another column pandas dataframe

I am kind of getting stuck on extracting value of one variable conditioning on another variable. For example, the following dataframe: A B ...

June 2, 2022
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Programming, Python

IT Nursery

Pretty Printing a pandas dataframe

How can I print a pandas dataframe as a nice text-based table, like the following? +------------+---------+-------------+ | column_one | col_two | column_3 | ...

June 2, 2022
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Programming, Python

IT Nursery

How to access pandas groupby dataframe by key

How do I access the corresponding groupby dataframe in a groupby object by the key? With the following groupby: rand = np.random.RandomState(1) df ...

June 2, 2022
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Programming, Python

IT Nursery

How to unnest (explode) a column in a pandas DataFrame, into multiple rows

I have the following DataFrame where one of the columns is an object (list type cell): df=pd.DataFrame({'A':[1,2],'B':[[1,2],[1,2]]}) df Out...

June 2, 2022
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