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Questions - rowwise

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

Count until condition is reached in Pandas

I need some input from you. The idea is that I would like to see how long (in rows) it takes before you can see a new value in column SUB_B1, and a new value in SUB_B2 i.e, how many steps is there b...
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perrus

python

pandas

cumulative-sum

rowwise

Votes: 0

Answers: 3

Latest Answer

Try using pandas.DataFrame.iterrows and pandas.DataFrame.shift. You can iterate through the dataframe and compare current row with the previous one, then add some condition: df['SUB_A2_last'] = df['SU...
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RikiSot

Create a column that is a list of named columns efficently R

I need to efficently create a new column that is a list of named column inputs. I do not know the names of the columns to input them directly so I need to be able to specify them by using a vector. I ...
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Richard Packer

r

dplyr

rowwise

Votes: 0

Answers: 1

Latest Answer

In base R, can use asplit with MARGIN = 1 for rowwise split. It returns a list of named vectors df$list_col <- asplit(df[col_names_vector], 1) Or in tidyverse, can also use transpose library(dpl...
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akrun

Pandas apply function to 100k+ row data frame

I am trying to use Pandas apply row-wise on a 100k+ data frame as follows: def get_fruit_vege(x, all_df, f_or_v): y_df = all_df[all_df['key'] == x['key']] if f_or_v == "F"...
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KidSudi

python

pandas

pycharm

apply

rowwise

Votes: 0

Answers: 0

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