In Example 1, I’ll illustrate how to drop certain columns of a data frame using the %in%-operator and the names function.The following R code checks whether the column names of our data frame (i.e. names(data))
This approach will set the data frame’s internal pointer to that single column to NULL, releasing the space and will remove the required column from the R data frame. A simple but efficient way to drop data frame columns. This is actually a very useful technique when working on project co...
> a <- subset(patientdata,status=='Improved') > a patientID age diabetes status 2 2 34 Type2 Improved > class(a) [1] "data.frame" > a <- subset(patientdata,status=='Improved',drop=T) > a $patientID [1] 2 $age [1] 34 $diabetes [1] Type2 Levels: Type1 Type2 $status [...
舍去几何信息 x@data st_set_geometry(x, NULL)/ st_drop_geometry(x) 添加属性为几何信息 addAttrToGeom st_sf 设置/获取几何要素 geometry<- st_geometry<- 按column合并数据框 cbind.Spatial cbind 按row合并数据框 rbind.Spatial* rbind空间几何计算功能sp 操作sf 操作 空间线段长度 SpatialLinesLengths ...
Here is an example of data frame(Testdata) Scenario 1 – (Dropping/deleting) list of columns from a data frame) Method 1: Delete column by name We are going to delete/dropVendor TypeandCountry df= subset(Testdata, select = -c ( Vendor Type, Country)) ...
library(forestploter) library(grid) p <- forest( data = plot_df[,c(1,6,7,9,8,3)], lower = plot_df$conf.low, upper = plot_df$conf.high, est = plot_df$estimate, ci_column = 4, sizes = (plot_df$estimate+0.001)*0.3, ref_line = 1, xlim = c(0.1,4) ) print(p) 如果你...
Example 1: Delete One Column By IndexIn this example, I’ll illustrate how to delete a single column by its index. We delete column number two.DT_2 <- data.table::copy(DT_1) # Replicate data set DT_1 DT_3 <- DT_2[ , -c(2) ] DT_3...
R>df<-data.frame(x=1:5,y=2:6,z=3:7,u=4:8)R>df x y z u1123422345334564456755678 Then you can use thewhichfunction and the-operator in column indexation : R>df[,-which(names(df)%in%c("z","u"))]x y112223334445556 Or, much simpler, use theselectargument of thesubsetfunction :...
1 构建数据框df x为factor变量,2010和2011位数值变量 2. 用reshape2::melt将2维数据转换为一维数据 df_melt<-reshape2::melt(df,id.vars="x",variable.name="year",value.name="value") Arguments 经过melt变换之后的df_melt 将长数据转换为宽数据 ...
How to Remove A Row in R (Single, Specific Row) There is a simple option to drop row(s) from adata frame – we can identify them by number. Continuing our example below, suppose we wished to purge row 578 (day 21 for chick 50) to address a data integrity problem. We could code ...