apply Questions
3
Solved
I want to calculate growing degree days with several bases, using minimum daily temp, and maximum daily temp. I would like to do this without a for loop if possible to minimize my code.
bases <-...
5
I'd like to apply a user-define function which takes a few inputs (corresponding some columns in a polars DataFrame) to some columns of a polars DataFrame in Rust. The pattern that I'm using is as ...
Cid asked 25/5, 2022 at 6:27
4
I have a matrix which would be a matrix of factors if R supported them. I want to print the matrix with the factor names, rather than integers, for readability. Using indexing loses the matrix stru...
Retreat asked 18/8 at 20:55
5
Solved
I have seen many answers posted to questions on Stack Overflow involving the use of the Pandas method apply. I have also seen users commenting under them saying that "apply is slow, and should be a...
Heterosexuality asked 30/1, 2019 at 2:34
6
Solved
I would like to append a columns to my data.frame in R that contain row sums and products
Consider following data frame
x y z
1 2 3
2 3 4
5 1 2
I want to get the following
x y z sum prod
1 2 3...
6
Solved
Consider this pandas example where I'm calculating column C by multiplying A with B and a float if a certain condition is fulfilled using apply with a lambda function:
import pandas as pd
df = pd....
Alum asked 11/1, 2017 at 10:14
4
Solved
I have a dataframe that may look like this:
A B C
foo bar foo bar
bar foo foo bar
I want to look through every element of each row (or every element of each column) and apply the following functio...
3
Solved
Here is a time series data like this,call it df:
'No' 'Date' 'Value'
0 600000 1999-11-10 1
1 600000 1999-11-11 1
2 600000 1999-11-12 1
3 600000 1999-11-15 1
4 600000 1999-11-16 1
5 600000 1999-11...
1
Solved
I have a census frequency distribution and want to calculate the median please.
import pandas as pd
import math
import numpy as np
geo_code 1 2 3 4 5 6 7
0 815 1026 735 1344 569 2688 741
1228801 ...
3
Solved
I have the following table1 which is a data frame composed of 6 columns and 8083 rows. Below I am displaying the head of this table1:
|gene ID | prom_65| prom_66| amast_69| amast_70| p_value|
|:-...
3
Solved
A question was already asked on how keeping colnames in a matrix when applying apply, sapply, etc. here.
But I didn't find how to keep the column AND row names of a matrix.
Below an example:
mat ...
14
Solved
I have a data frame where some of the columns contain NA values.
How can I remove columns where all rows contain NA values?
12
Solved
Whenever I want to do something "map"py in R, I usually try to use a function in the apply family.
However, I've never quite understood the differences between them -- how {sapply, lapply, etc.} ...
Buchheim asked 17/8, 2010 at 18:31
4
If I have the following case class with a private constructor and I can not access the apply-method in the companion object.
case class Meter private (m: Int)
val m = Meter(10) // constructor Met...
Cling asked 17/11, 2013 at 12:47
3
Solved
Suppose I have a dataframe containing a column of probability. Now I create a map function which returns 1 if the probability is greater than a threshold value, otherwise returns 0. Now the catch i...
Nonscheduled asked 1/7, 2020 at 17:12
5
Solved
I wanted to invoke a function using the javascript apply() method. This works fine if the function has no arguments. i.e.
function test()
{
console.log(this);
}
body = document.getElementsByTagN...
Annam asked 6/10, 2011 at 15:37
2
Solved
I'm trying to apply a function to all rows of a pandas DataFrame (actually just one column in that DataFrame)
I'm sure this is a syntax error but I'm know sure what I'm doing wrong
df['col'].apply(...
8
Solved
I have a pandas dataframe with multiple columns. I want to change the values of the only the first column without affecting the other columns. How can I do that using apply() in pandas?
5
Solved
I have the following dataframe:
a a a b c c d e a a b b b e e d d
The required result should be
a b c d e a b e d
It means no two consecutive rows should have same value. How it can be done...
8
Solved
I want to apply my custom function (it uses an if-else ladder) to these six columns (ERI_Hispanic, ERI_AmerInd_AKNatv, ERI_Asian, ERI_Black_Afr.Amer, ERI_HI_PacIsl, ERI_White) in each row of my dat...
4
I'm having difficulty to solve a look-back or roll-over problem in dataframe or perhaps in groupby.
The following is a simple example of the dataframe I have:
fruit amount
20140101 apple 3
20...
4
Solved
New to pandas, I already want to parallelize a row-wise apply operation. So far I found Parallelize apply after pandas groupby However, that only seems to work for grouped data frames.
My use case...
Frailty asked 2/9, 2016 at 5:37
2
Solved
I'm trying to extract the second subelement of every element in a list while ignoring NAs in R. Here's a small example:
mylist <- list(a=c(6,7),b=NA,c=c(8,9))
sapply(mylist, "[[", 1)
sapply(myl...
6
How do I achieve row-wise iteration using purrr::map?
Here's how I'd do it with a standard row-wise apply.
df <- data.frame(a = 1:10, b = 11:20, c = 21:30)
lst_result <- apply(df, 1, func...
2
Solved
I am using the function parSapply to run a simulation on the parallel environment. Here is my code:
runpar <- function(i) MonteCarloKfun(i=i)
# Detect number of cores available
ncores <- d...
Sain asked 5/7, 2016 at 9:20
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