在一个图上画多个平滑曲线：
d1 <- cbind(rnorm(100), rnorm(100,3,1)) d2 <- cbind(rnorm(100), rnorm(100,1,1)) plot(d1[,1], d1[,2], xlim=range(c(d1[,1], d2[,1])), ylim=range(c(d1[,2], d2[,2])), col="blue", xlab="X", ylab="Y") points(d2[,1], d2[,2], col="red") points(loess.smooth(d1[,1], d1[,2]), type="l", col="blue") points(loess.smooth(d2[,1], d2[,2]), type="l", col="red") |
随机取样，缩小绘图时的样本量
# take a random sample of size 50 from a dataset mydata # sample without replacement mysample <- mydata[sample(1:nrow(mydata), 50, replace=FALSE),] |
在一个图上画多个丰度曲线（柱状图）
d1 <- cbind(rnorm(100), rnorm(100,3,1)) d2 <- cbind(rnorm(100), rnorm(100,1,1)) d3 <- cbind(rnorm(100), rnorm(100,5,1)) ds1<-density(d1) ds2<-density(d2) ds3<-density(d3) xr<-range(c(ds1$x,ds2$x,ds3$x)) yr<-range(c(ds1$y,ds2$y,ds3$y)) plot(ds1,xlim=xr,ylim=yr,col='black') lines(ds2,col='blue') lines(ds3,col='red') |
逐行比较两个矩阵
ar1 <- array(data=c(1:16),dim=c(4,4)) ar2 <- array(data=c(1,2,3,3,5:16),dim=c(4,4)) z<-ar1==ar2 ar1 [,1] [,2] [,3] [,4] [1,] 1 5 9 13 [2,] 2 6 10 14 [3,] 3 7 11 15 [4,] 4 8 12 16 ar2 [,1] [,2] [,3] [,4] [1,] 1 5 9 13 [2,] 2 6 10 14 [3,] 3 7 11 15 [4,] 3 8 12 16 z [,1] [,2] [,3] [,4] [1,] TRUE TRUE TRUE TRUE [2,] TRUE TRUE TRUE TRUE [3,] TRUE TRUE TRUE TRUE [4,] FALSE TRUE TRUE TRUE which(z==FALSE) [1] 4 |
Or
apply(ar1==ar2,1,all) |
在同一行行首开始重新输出，适用于显示进度，比如说任务进行至第几行。
> for (i in 1:10) { > cat("Number",i,"\r") > flush.console() > Sys.sleep(1) > } > cat("\n") |
