file: 表示文件名,默认值为data ncolumns: 正整数,表示保存到文件中数据的列数,若是字符型数据,默认值为1;若是数值型数据,默认值为5 append: 逻辑变量,取值为TRUE时,表示在已有文件上添加数据;取值为FALSE(默认值)时,写入一个新文件 例如:在R中输入以下命令,观察其运行效果: A<-matrix(1:25,ncol =5) A...
In addition, you may want to have a look at the other articles on my website. Group data.table by Multiple Columns in R dplyr & plyr Error: Can’t rename columns that don’t exist. Summarize Multiple Columns of data.table by Group in R Remove Multiple Columns from data.table in R R...
# Last_Sepal.Length Last_Sepal.Width Last_Petal.Length Last_Petal.Width Last_Species ...
There's also a way to rename columns one at a time using thecolnames()function, but it's syntactically a lot more complicated. It's unnecessarily complicated. It's complicated enough that I won't even bother to show it to you ... you should just use thedplyrrename()function. There ar...
# Change colname of one columncolnames(data)[colnames(data)=="Old_Name"]<-"New_Name"# Change colnames of all columnscolnames(data)<-c("New_Name1","New_Name2","New_Name3")# Change colnames of some columnscolnames(data)[colnames(data)%in%c("Old_Name1","Old_Name2")]<-c("New_Na...
The package `dplyr` also has some handy pattern matching functions built in. For example, we can use the function `contains` in `select` to exclude those columns with the "\_cd" string. @@ -112,13 +112,13 @@ yahara_dat <- select(yahara_dat, -contains('_cd')) head(yahara_dat)...
Expand All @@ -26,11 +26,11 @@ library(dplyr) library(ggrepel) library(fields) library(stringr) source('~/Documents/MIT/Research/Rafalab/Projects/slideseq/Cell Demixing/ContentStructure/RCTD/AnalysisRCTDE/helper_functions/merge_de_helper.R') source('~/Documents/MIT/Research/Rafalab/Projects...
Running into something strange as I try to use dplyr's select command to reduce the number of columns I have. I name three columns but I keep getting 4. Aside from the star trek chain of command flash...Indexing with modulo has a huge performance hit I have a simple code that sums...