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Python - In pandas, how to reliably set the index order of multilevel columns during or after a pivot of two columns plus a value column?

After pivot, the values don't have an index name, you have to assign it: (df.pivot(columns={'multi-1', 'multi-3'}, values=['multi-2']) .rename_axis(columns={None: 'multi-2'}) .reorder_levels(['m...

Tags: python, pandas, dataframe

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How do I condense one column of a data frame by checking another column?

We can use pivot.wider library(dplyr) library(tidyr) df %>% group_by(record) %>% mutate(id = 1:n(), x = coalesce(x, 0)) %>% pivot_wider(names_from = id, values_from = x, values_fill...

Tags: r, dataframe

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Python - How could I get a value out of a pandas DataFrame with a shape of (1,1) without using .to_list()[0]?

You can do: print(column_and_row_of_interest.squeeze()) OR: print(column_and_row_of_interest.iat[0]) This prints: 200.0

Tags: python, pandas, dataframe

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Python - Polars Expressions Failed to Access Imtermediate Column Creation Expressions?

While the solution using the walrus operator works. It is probably more idiomatic and cleaner to use an pl.when().then() construct in conjunction with pl.int_range() to create the event_id. ( df...

Tags: python, pandas, dataframe

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Converting a dataframe into a long format contingency table for network analysis purposes?

In base R you could do something like: combo setNames(c("target", "source")) |> transform(count = sapply(asplit(combo, 2), \(x) sum(rowMeans(emot[,x]) == 1L))) Basically, get all the combination...

Tags: r, dataframe, count

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Python - How to generate the section id based on certain condition?

I don't think you need to do this in Pandas. You can create a class that tracks the current section and bumps it by 1, or appends a subsection, or truncates and increments, based on the paragraph typ...

Tags: python, python-3.x, pandas

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Duplicate words within a string by variable amount?

cbind(df, C = sapply(strsplit(df$ColB, ';'), \(x)paste(do.call(rep, unname(read.table(text=x, sep=':'))), collapse = ';'))) ColA ColB C...

Tags: r, dataframe, text

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Aggregate discrete frequency table in smaller table with fewer intervals?

It seems that you are looking for binning. Try cut_interval - it will create several groups (bins) of your values, then look at levels. library(ggplot2) table

Tags: r, dataframe, counting

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Python - Why does `.rename(columns={'b': 'b'}, copy=False)` followed by inplace method not update the original dataframe?

copy=False means that the underlying data (numpy) is shared. If we modify one item of the underlying numpy array, it is reflected since the data is shared: df = pd.DataFrame({'a': [1,2,3], 'b': [4,5,6...

Tags: python, pandas, dataframe

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Coerce columns of data.frame from 'character' to "numeric" in R?

As @s_baldur states in his comment, you need double [[ to extract an item's list as a vector. [ merely subsets the original list, i.e., it returns a list: > my_list my_list[1] $X [1] "A" "B" > class...

Tags: r, dataframe, rstudio

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