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Questions - apply

Pandas apply multiple function with list

I have a df with a 'File_name' column which contains strings of a file name, which I would like to parse: data = [['f1h3_13oct2021_gt1.csv', 2], ['p8-gfr-20dec2021-81.csv', 0.5]] df= pd.DataFrame(dat...
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ingcerullo

python

pandas

lambda

apply

Votes: 0

Answers: 1

Latest Answer

Assuming you want to extract and convert the possible chunks as date, you could split the string on delimiters, explode to multiple rows and attempt to convert to date with pandas.to_datetime: df.join...
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mozway

how to apply() a function only to rowSums() > 0

any thoughts on how to apply a function to only row where there is at least 1 value more than 0? I tried: batch4 = raw_mat[,all_conds == "LR140 AM"] %>% apply(., 1, FUN = function...
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Rob

dplyr

apply

rowwise

Votes: 0

Answers: 0

Calculate every row in a pandas dataframe with a value specific to that row

I have a fairly big dataframe with around 20 columns containing floats, and one column with a factor. index col1 col2 factor row1 5.2 10.5 1.01 row2 92.61 141.7 1.3 row3 2.75 205.56 1.9 ...
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ssiftekhar

python

pandas

dataframe

apply

Votes: 0

Answers: 2

Latest Answer

Use Index.difference for columns names for multiple by column with DataFrame.mul: cols = df.columns.difference(['factor']) df[cols] = df[cols].mul(df['factor'], axis=0) print (df) col1 co...
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jezrael

Create new column with applying a function (TypeError: unhashable type: 'list')

df['identities'] | identities | | --------------------------------------------------------- | | 0 [93, 94, 127, 112, 93, 94, 127, 112, 20, 68, 6....
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7F_WZ

python

pandas

list

function

apply

Votes: 0

Answers: 1

Latest Answer

Using just 1 row of the dataframe works with this code because the key provided to the dictionary will be an int, instead of a list of ints. Python will give you this TypeError: unhashable type: 'list...
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DWKOT

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