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r - How to convert dataframe column names from strings into arguments suitable for (qplot, ggplot2)?
    I want to write a function that takes a dataframe, and graphs all the columns in that dataframe as histograms. For ... 'histogram') won't work } See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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r - data.table error when used through knitr, gWidgetsWWW
    I'm experimenting with gWidgetsWWW and encountered a strange error. I created a button with a handler to knit2html a ... error... Any ideas? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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626 views
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r - calculate mean for multiple columns in data.frame
    Just wondering whether it is possible to calculate means for multiple columns by just using the mean function e.g. mean( ... (iris[,1:4],mean) See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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747 views
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r - how to make single stacked bar chart in ggplot2
    Ancestry <- data.frame(Race = c("European", "African American", "Asian", "Hispanic", "Other"), ... a stacked barchart similar to this: See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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532 views
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r - set upper limit in ggplot to include label greater than the maximum value
    My data range always seems to be greater than the top label in the y-axis. Is there a way I can ... numbers in scale options for example. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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581 views
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r - ggplot2: How to adjust fill colour in a boxplot (and change legend text)?
    How can I: Set the fill colors in the boxplot below? I tried the argument "colour" but that failed. Change the ... =c("grey50", "white"))) See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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553 views
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r - geom_rect failure: Error in eval(expr, envir, enclos) : object 'variable' not found
    I am trying to replicate Hadley Wickham's example on page 86 of the ggplot2 book, where he overlays geom_rects ... pointed out by @smu. Thanks. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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617 views
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r - How can library() accept both quoted and unquoted strings
    For example, in an R session, typing library(ggplot2) and library("ggplot2") can both import the library ... without complaining about it? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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754 views
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r - `ggplot2`: label values of barplot that uses `fun.y="mean"` of `stat_summary`
    If I use ggplot2's stat_summary() to make a barplot of the average number of miles per gallon for 3-, ... the average value from stat_summary(). See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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674 views
1 answer
r - How to increase the space between grouped bars in ggplot2?
    [Data and code to produce plot at the end of the post] Using ggplot, I plotted a bargraph with error bars, ... , panel.border = element_blank()) See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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554 views
1 answer
r - Can't connect to local MySQL server through socket error when using SSH tunel
    I am trying to use dplyr to connect to a remote database, that I usually query through a ssh tunnel. I ... port=3307) <MySQLConnection:0,1> See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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448 views
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r - arrange_() multiple columns with descending order
    I am trying to use arrange_() with string input and in one of the columns in descending order. library( ... something very obvious, ideas? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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369 views
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r - Are dataframe[ ,-1] and dataframe[-1] the same?
    Sorry this seems like a really silly question but are dataframe[ ,-1] and dataframe[-1] the same, and does it ... ? And why are they the same See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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953 views
1 answer
r - Error: package or namespace load failed for ‘rJava’
    So I have tried the previously proposed answer to my question. but I am still having the same error message: I ... rJava' Please help, Thanks See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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443 views
1 answer
r - ggplot: manual color assignment for single variable only
    I have this plot: ggplot(data3, aes(year, NY.GDP.MKTP.KD.ZG, color = country)) + geom_line() + xlab(' ... (countries), depending on input data. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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677 views
1 answer
r - sum multiple columns by group with tapply
    I wanted to sum individual columns by group and my first thought was to use tapply. However, I cannot get tapply ... apples cherries # -111 -222 See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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512 views
1 answer
r - How to change the order of the panels in simple Lattice graphs
    Hi I am using the following code to generate an xyplot using lattice xyplot(Rate~Weight|Temp, groups=Week, rate ... order Thanks for the help See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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362 views
1 answer
r - Plot probability heatmap/hexbin with different sized bins
    This is related to another question: Plot weighted frequency matrix. I have this graphic (produced by the code ... like my hand-drawn sketch. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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590 views
1 answer
r - Vectorize() vs apply()
    The Vectorize() and the apply() functions in R can often be used to accomplish the same goal. I usually prefer ... make apply() a better option? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
595 views
1 answer
r - Constrain multiple sliderInput in shiny to sum to 100
    I've been struggling with this all day and I've kind of solved it (horrible hack). However there experience is ... do I fix these two issues? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
577 views
1 answer
r - cumulative plot using ggplot2
    I'm learning to use ggplot2 and am looking for the smallest ggplot2 code that reproduces the base::plot result below. I ... )), type = "l") See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
677 views
1 answer
r - grid.arrange using list of plots
    I feel I'm always asking a variation of the same question :( I recently got a list of plots + table to ... it incorrectly. Thanks for any help. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
436 views
1 answer
r - How do I sweep specific columns with dplyr?
    An incredibly common operation for my type of data is applying a normalisation factor to all columns. This can ... by its matching factor. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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497 views
1 answer
r - Changing word template for knitr in Rmarkdown
    I'm using Rstudio to make a markdown document which I want to convert to a word document. I would like to ... Windows 64 bit, with Windows 7. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
400 views
1 answer
r - Fast way of getting index of match in list
    Given a list a containing vectors of unequal length and a vector b containing some elements from the vectors in ... the other hand more flexible See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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420 views
1 answer
r - Extracting decimal numbers from a string
    I have a string such as "3.1 ml" or "abc 3.1 xywazw" I'd like to extract "3.1" from this ... solution works for the case of decimal numbers. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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389 views
1 answer
r - Subset observations that differ by at least 30 minutes time
    I have a data.table (~30 million rows) consisting of a datetime column in POSIXct format, an id column and a ... (I'm using data.table anyway) See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
431 views
1 answer
r - Subsetting a data.table by range making use of binary search
    How do you go about subsetting a data.table by a numeric range, with the intention of using binary search? ... columns - super-slow setkey See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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