向轴标签添加逗号分隔符

Question

我有以下示例，其中我尝试向大于 999 的数字添加逗号分隔符（即 1,000 2,000 3,000 ...）

#Dummy data
Data1 <- data.frame(flow = c(8000,8.5,6,7.1,9), SP_elev = c(20,11,5,25,50))
Data2 <- data.frame(flow = c(7000,7.2,6.5,8.2,8.5), SP_elev = c(13,15,18,25,19))
Data3 <- data.frame(flow = c(2000,3,5,7,9), SP_elev = c(20,25,28,30,35))
Data4 <- data.frame(flow = c(1000,4,6,8,9), SP_elev = c(13,15,18,25,19))
Data5 <- data.frame(flow = c(1000,4,6,8,9), SP_elev = c(13,15,18,25,19))
Data6 <- data.frame(flow = c(1000,4,6,8,9), SP_elev = c(22,23,25,27,29))

#Create Vector list (in place of list.files)
dataframes = list("Data1" = Data1, 
                  "Data2" = Data2, 
                  "Data3" = Data3,
          "Data4" = Data4,
          "Data5" = Data5,
          "Data6" = Data6)

# open the PDF device
pdf(file="Dummy_Example.pdf", paper="letter", height=10, width=8)

#Create array of plots 
par(mfrow=c(3,2))

#plot a with regression model
for (i in dataframes) {

plot (i[,c('flow', 'SP_elev')], xlab=expression(paste("Discharge (", ft^3, "/s)",sep = "")), ylab= "Elevation (m)", tck=0.02, adj = 0.5)
axis(side=1, at=axTicks(1), labels=formatC(axTicks(1), format="d", big.mark=','))

}

# close the PDF device
dev.off()

x 轴标签在输出 PDF 上绘制两次。我axis在上面代码中的命令中哪里出错了？

Answer 1

#Dummy data
Data1 <- data.frame(flow = c(8000,8.5,6,7.1,9), SP_elev = c(20,11,5,25,50))
Data2 <- data.frame(flow = c(7000,7.2,6.5,8.2,8.5), SP_elev = c(13,15,18,25,19))
Data3 <- data.frame(flow = c(2000,3,5,7,9), SP_elev = c(20,25,28,30,35))
Data4 <- data.frame(flow = c(1000,4,6,8,9), SP_elev = c(13,15,18,25,19))
Data5 <- data.frame(flow = c(1000,4,6,8,9), SP_elev = c(13,15,18,25,19))
Data6 <- data.frame(flow = c(1000,4,6,8,9), SP_elev = c(22,23,25,27,29))

#Create Vector list (in place of list.files)
dataframes = list("Data1" = Data1, 
                  "Data2" = Data2, 
                  "Data3" = Data3,
          "Data4" = Data4,
          "Data5" = Data5,
          "Data6" = Data6)

# open the PDF device
pdf(file="Dummy_Example.pdf", paper="letter", height=10, width=8)

#Create array of plots 
par(mfrow=c(3,2))

#plot a with regression model
for (i in dataframes) {

plot (i[,c('flow', 'SP_elev')], xlab=expression(paste("Discharge (", ft^3, "/s)",sep = "")), ylab= "Elevation (m)", tck=0.02, adj = 0.5, xaxt='n')
axis(side=1, at=axTicks(1), labels=formatC(axTicks(1),  big.mark=','))
}


# close the PDF device
dev.off()

为了使轴标签不会出现两次， xaxt='n'需要添加到plot函数中。当axis在 for 循环中调用时，轴标签被格式化和绘制。