Recent questions tagged R

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r - Why does as.factor return a character when used inside apply?

I want to convert variables into factors using apply(): a <- data.frame(x1 = rnorm(100), x2 = ... character vectors instead of factor vectors. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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411 views

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r - agrep: only return best match(es)

I'm using the 'agrep' function in R, which returns a vector of matches. I would like a function ... matches$matches) } ClosestMatch(word,words) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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291 views

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r - Change row order in a matrix/dataframe

I need to change/invert rows in my data frame, not transposing the data but moving the bottom row to the top and ... not able to find the way. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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253 views

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r - Do you use attach() or call variables by name or slicing?

Many intro R books and guides start off with the practice of attaching a data.frame so that you can call ... people feel about this practice? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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309 views

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r - Using If/Else on a data frame

I have a data set which looks something like data<-c(0,1,2,3,4,2,3,1,4,3,2,4,0,1,2,0,2, ... has answered that question. Many thanks in advance! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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309 views

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r - Add a row by reference at the end of a data.table object

In this question the data.table package creator explains why rows cannot be inserted (or removed) by reference in ... other (better) methods? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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379 views

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r - Select every other element from a vector

Let's say I had a vector: remove <- c(17, 18, 19, 20, 24, 25, 30, 31, 44, 45). How do I ... doesn't quite work. Any help is greatly appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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364 views

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r - How do I change the color value of just one value in ggplot2's scale_fill_brewer?

I have a R dataframe (df) which I am plotting as a bar graph in ggplot2, and coloring based on a column ... and work for "Set2" of ColorBrewer See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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339 views

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r - Remove duplicates keeping entry with largest absolute value

Let's say I have four samples: id=1, 2, 3, and 4, with one or more measurements on each of those samples: > a ... 4 6 How might I do this in R? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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427 views

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r - Convert four digit year values to class Date

I've an integer column in my dataset which has four digit year values, like: c(2001, 2002, 2002, 2002, 2003, ... . How to achieve this in R? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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275 views

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r - Extract a column from a data.table as a vector, by position

How do I extract a column from a data.table as a vector by its position? Below are some code snippets I have tried ... ),with=FALSE]) #[1] FALSE See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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275 views

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r - How to parametrize function calls in dplyr 0.7?

The release of dplyr 0.7 includes a major overhaul of programming with dplyr. I read this document carefully, and I am ... dbl> #> 1 am 6.1875 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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407 views

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r - dplyr filter with condition on multiple columns

Here's a dummy data : father<- c(1, 1, 1, 1, 1) mother<- c(1, 1, 1, NA, NA) children <- c(NA, ... column with na (except father==1 & mother==1) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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553 views

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r - Remove columns from dataframe where some of values are NA

I have a dataframe where some of the values are NA. I would like to remove these columns. My data.frame looks ... Can anyone give me some help? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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478 views

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r - Convert NA into a factor level

I have a vector with NA values that I would like to replace by a new factor level NA. a = as.factor(as.character(c( ... 2 3 NA Levels: 1 2 3 NA See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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438 views

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r - Difference between passing options in aes() and outside of it in ggplot2

After fiddling with point size options in ggplot2, I noticed examples in which size was passed both inside and ... aes() affect the result. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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367 views

1 answer

r - ggplot centered names on a map

I'm attempting to use ggplot2 and maps to plot the names of the counties in NY state. My approach was to find the ... sr, size=.5)) #attempt 3 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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559 views

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r - Connecting across missing values with geom_line

I'm trying to figure out if it's possible to connect across missing values using geom_line. For example, in ... facet_wrap(~ individual, ncol=3) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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346 views

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r - Download a file from HTTPS using download.file()

I would like to read online data to R using download.file() as shown below. URL <- "https:// ... nonzero exit status Appreciate your help. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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360 views

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r - Extract names of objects from list

I have a list of objects. How do I grab the name of just one object from the list? As in: LIST <- list(A= ... be in red at the top of both plots See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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516 views

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r - dplyr::group_by_ with character string input of several variable names

I'm writing a function where the user is asked to define one or more grouping variables in the function call. ... one but not answered there.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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294 views

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r - How do I override a non-visible function in the package namespace?

I basically want to change a non-visible function of a package. For visible functions, i.e. functions that have no ... .ar, pos="package:stats") See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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549 views

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r - predict.lm() with an unknown factor level in test data

I am fitting a model to factor data and predicting. If the newdata in predict.lm() contains a single factor level ... to the unknown level "D". See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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323 views

1 answer

r - unique() for more than one variable

I have the following data frame in R: > str(df) 'data.frame': 545227 obs. of 15 variables: $ ykod : int 93 93 ... .. ... How can I achieve this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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376 views

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r - Why is the terminology of labels and levels in factors so weird?

An example of a non-settable function would be labels. You can only set factor labels when they are created ... opportunity to enlighten me.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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354 views

1 answer

r - Dynamic column names in data.table

I am trying to add columns to my data.table, where the names are dynamic. I addition I need to use the ... columns using data.table, by group See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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221 views

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r - What's the use of which?

I'm trying to get a handle on the ubiquitous which function. Until I started reading questions/answers on ... a vectorized Boolean comparison? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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527 views

1 answer

r - Pretty ticks for log normal scale using ggplot2 (dynamic not manual)

I am trying to use ggplot2 to create a performance chart with a log normal y scale. Unfortunately I'm not ... ) Thanks! edit: inserted pictures See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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