Recent questions tagged R

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I'm computing Spearman's rho on small sets of paired rankings. Spearman is well known for not handling ties properly. ... it with a lot of ties? See Question&Answers more detail:os...

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

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321 views

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r - Sum of rows based on column value

I want to sum rows that have the same value in one column: > df <- data.frame("1"=c("a","b","a","c","c"), "2"=c( ... X3 1 a 4 7 2 b 5 3 3 c 8 7 See Question&Answers more detail:os...

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

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283 views

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r - Extracting text data from PDF files

Is it possible to parse text data from PDF files in R? There does not appear to be a relevant package for ... R if possible. Any suggestions? See Question&Answers more detail:os...

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

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418 views

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r - Scale and size of plot in RStudio shiny

Related, but only talks about the allocated plot space in general, not how to directly set the plot image ... the desired mainPanel area? See Question&Answers more detail:os...

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

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448 views

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r - Is there a built-in way to do a logarithmic color scale in ggplot2?

Here's an example of a binned density plot: library(ggplot2) n <- 1e5 df <- data.frame(x = rexp(n), y ... there's anything obvious I'm missing. See Question&Answers more detail:os...

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

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368 views

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r - Conditionally Count in dplyr

I have some member order data that I would like to aggregate by week of order. This is what the data looks ... m having trouble figuring it out. See Question&Answers more detail:os...

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

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333 views

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r - Create a ranking variable with dplyr?

Suppose I have the following data df = data.frame(name=c("A", "B", "C", "D"), score = c(10, 10, ... in mind. What function should I be using? See Question&Answers more detail:os...

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

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r - Return index of the smallest value in a vector?

a <- c(1, 2, 0, 3, 7) I am looking for a function to return the index of the smallest value, 3. What is it? See Question&Answers more detail:os...

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

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r - How to catch integer(0)?

Let's say we have a statement that produces integer(0), e.g. a <- which(1:3 == 5) What is the safest way of catching 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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357 views

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r - Converting data frame column from character to numeric

I have a data frame that I construct as such: > yyz <- data.frame(a = c("1","2","n/a"), b = c ... it the way R is interpreting the data frame? See Question&Answers more detail:os...

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

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640 views

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r - Changing font in PDF produced by rmarkdown

I am producing reports using rmarkdown. When knitting a PDF --- title: "Untitled" output: pdf_document --- I would ... into it at this very mom 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 - Undefined columns selected when subsetting data frame

I have a data frame, str(data) to show more about my data frame the result is the following: > str(data) ... > 14) : undefined columns selected See Question&Answers more detail:os...

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

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480 views

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r - Debugging lapply/sapply calls

Code written using lapply and friends is usually easier on the eyes and more Rish than loops. I love lapply ... do when using lapply/sapply? See Question&Answers more detail:os...

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

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374 views

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r - Count number of records and generate row number within each group in a data.table

I have the following data.table set.seed(1) DT <- data.table(VAL = sample(c(1, 2, 3), 10, replace = TRUE) ... . So, what's the data.table 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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413 views

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r - How do I change the number of decimal places on axis labels in ggplot2?

Specifically, this is in a facet_grid. Have googled extensively for similar questions but not clear on the syntax ... .ticks=element_blank() ) See Question&Answers more detail:os...

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

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441 views

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r - Remove facet_wrap labels completely

I'd like to remove the labels for the facets completely to create a sort of sparkline effect, as for the ... valued time-series like 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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415 views

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r - Obtaining threshold values from a ROC curve

I have some models, using ROCR package on a vector of the predicted class percentages, I have a performance object ... used to make that point? See Question&Answers more detail:os...

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

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361 views

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r - How can I label points in this scatterplot?

Can you help me on putting labels on the following graph? The code i use is: valbanks<-scan("banks.txt", what ... the code i need to put? Thanks See Question&Answers more detail:os...

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

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324 views

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r - Convert a data frame to a data.table without copy

I have a large data frame (in the order of several GB) that I'd like to convert to a data.table. Using ... .4 322342905 2459.3 200933219 1533.0 See Question&Answers more detail:os...

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

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545 views

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r - Get the path of current script

I would like to set the working directory to the path of current script programmatically but first I need to ... library to 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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386 views

1 answer

r - Find duplicated elements with dplyr

I tried using the code presented here to find ALL duplicated elements with dplyr like this: library(dplyr) mtcars % ... last = TRUE)]) approach? See Question&Answers more detail:os...

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

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1.0k views

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r - ggplot geom_text font size control

I tried to change the font to 10 for the labels of my bar plot in ggplot2 by doing something like this: ... in theme(text=element_text()) ? See Question&Answers more detail:os...

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

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223 views

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r - Plotting interpolated data on map

I have survey data of species richness that was taken at various sites in the Chesapeake Bay, USA, and I ... )+ coord_map(projection="mercator") See Question&Answers more detail:os...

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

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904 views

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r - ROC curve from training data in caret

Using the R package caret, how can I generate a ROC curve based on the cross-validation results of the ... for each cross-validated sample. See Question&Answers more detail:os...

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

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263 views

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r - DocumentTermMatrix error on Corpus argument

I have the following code: # returns string w/o leading or trailing whitespace trim <- function (x) gsub("^\s ... , "TextDocument") it is 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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377 views

1 answer

r - Reset par to the default values at startup

Normally when I make my own plot functions, I make a construct : op <- par("mypar"=myvalue) on.exit(par( ... the default values for par()? See Question&Answers more detail:os...

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

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500 views

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r - Plotting multiple time series on the same plot using ggplot()

I am fairly new to R and am attempting to plot two time series lines simultaneously (using different colors, of ... be much appreciated. TIA. See Question&Answers more detail:os...

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

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292 views

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r - How to properly document S4 methods using roxygen2

I've seen some discussions in SO and other places regarding how this should be or will be done in future versions ... R CMD build mypkgname) ? See Question&Answers more detail:os...

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

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