English 中文(简体)
a. 动态扩大使用bin子的数据框架栏
原标题:dynamically expand a data frame columns using cbind

我愿利用<条码>cbind,在一栏中建立一个数据框架。 我尝试如下:

test <- NULL
df <- data.frame(x=c(1,2,3,4))
test <- cbind(test, df)

造成错误:

Error in data.frame(..., check.names = FALSE) : arguments imply differing number of rows: 0, 4

在R和随后在一片路中放弃空白数据框架的正确方式是什么?

Thanks

最佳回答

您需要创建<条码>测试,作为拥有相同数目的行文结构,以便<条码>cbind.data.frame。 不会犯错误:

 test <-data.frame(row.names=1:4)
 df <- data.frame(x=c(1,2,3,4))
 test <- cbind(test, df)

 test
  x
1 1
2 2
3 3
4 4

其他两种方法:

> test <-data.frame(row.names=1:4)
>      test[[ x ]] <-c(1,2,3,4)
> test
  x
1 1
2 2
3 3
4 4


> test <-data.frame(row.names=1:4)
>      test[1] <-list(x=c(1,2,3,4))
> test
  x
1 1
2 2
3 3
4 4
问题回答

正如Roman Luštrik所指出的,使用白化剂可能效率低下。 你可以先用空名单,然后将空档改为数据。

test <- list()
# inner loop assigment
test <- c(test,list(c(1:4)))
# after loop
test <- as.data.frame(test)




相关问题
How to plot fitted model over observed time series

This is a really really simple question to which I seem to be entirely unable to get a solution. I would like to do a scatter plot of an observed time series in R, and over this I want to plot the ...

REvolution for R

since the latest Ubuntu release (karmic koala), I noticed that the internal R package advertises on start-up the REvolution package. It seems to be a library collection for high-performance matrix ...

R - capturing elements of R output into text files

I am trying to run an analysis by invoking R through the command line as follows: R --no-save < SampleProgram.R > SampleProgram.opt For example, consider the simple R program below: mydata =...

R statistical package: wrapping GOFrame objects

I m trying to generate GOFrame objects to generate a gene ontology mapping in R for unsupported organisms (see http://www.bioconductor.org/packages/release/bioc/vignettes/GOstats/inst/doc/...

Changing the order of dodged bars in ggplot2 barplot

I have a dataframe df.all and I m plotting it in a bar plot with ggplot2 using the code below. I d like to make it so that the order of the dodged bars is flipped. That is, so that the bars labeled "...

Strange error when using sparse matrices and glmnet

I m getting a weird error when training a glmnet regression. invalid class "dgCMatrix" object: length(Dimnames[[2]]) must match Dim[2] It only happens occasionally, and perhaps only under larger ...

Generating non-duplicate combination pairs in R

Sorry for the non-descriptive title but I don t know whether there s a word for what I m trying to achieve. Let s assume that I have a list of names of different classes like c( 1 , 2 , 3 , 4 ) ...

Per panel smoothing in ggplot2

I m plotting a group of curves, using facet in ggplot2. I d like to have a smoother applied to plots where there are enough points to smooth, but not on plots with very few points. In particular I d ...

热门标签