python (65.1k questions)

javascript (44.2k questions)

reactjs (22.7k questions)

java (20.8k questions)

c# (17.4k questions)

html (16.3k questions)

r (13.7k questions)

android (12.9k questions)

Questions - subset

get top 3 values per row and keep the column index

Consider the following matrix: m <- structure(c(0.00165720273925865, 0.000414300684814661, 0.00126727268296249, 0.0105768527770331, 0.00126727268296249, 0.00155972022518461, 0.00046304194185168,...
test-img

moth

r

sorting

grouping

subset

Votes: 0

Answers: 1

Latest Answer

You can use order to get the indices, and head(x, 3) to get the top 3 values. head(apply(m, 1, function(x) order(x, decreasing = TRUE)), 3) M001_0.6 M002_0.6 M004_0.6 M012_0.6 M013_0.6 [1,] ...
test-img

Ma&#235;l

Subsetting with dredge function (MuMin)

I'm trying to subset a series of models dredged from a global model that has both linear & non-linear terms. There are no interactions e.g. Glblm <- Y ~ X1 + X2 + X3 + I(X3^2) + X4 + X5 + X6 + ...
test-img

Julia Simons

r

subset

mumin

Votes: 0

Answers: 1

Latest Answer

A reproducible example from you is needed to pinpoint the issue, specifying what type of model you are fitting. In simple linear models (lm, those examples provided in MuMIn handbook), the name of fit...
test-img

Juan_814

Create categorical variable/data subset with case matching

I have a dataset like this: structure(list(year = c(2019, 2019, 2019, 2019, 2019, 2019), venue = c("Z", "Z", "Z", "Z", "O", "D"), HO = ...
test-img

Cristiano

r

dplyr

match

subset

data-wrangling

Votes: 0

Answers: 1

Latest Answer

You can first group your dataframe by row using rowwise(), then paste the HO and AW columns together. This step is to see which rows have the same HO and AW regardless of order. Then group_by the uniq...
test-img

benson23

number of different observations in a column

How can I find how many different observations there are in a column? For example in a column "species" with 3000 rows I want to find how many different species there are. I read something a...
test-img

Dimitra Nikoloutsou

r

filter

subset

Votes: 0

Answers: 1

Latest Answer

You can use length and unique to determine for example in the iris dataset how many unique species there are in the Species column. You can use the following code: length(unique(iris$Species)) Output...
test-img

Quinten

Posts

Questions

Blogs

Jobs