將逗號分隔符添加到軸標簽

Question

我有以下示例，其中我嘗試向大於999（即1,000 2,000 3,000 ...）的數字添加逗號分隔符

#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軸標簽在輸出PDF上繪制了兩次。 上面代碼中的axis命令在哪里出錯？

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()

為了使軸標簽不會出現兩次，需要將xaxt='n'添加到plot功能中。 在for循環中調用axis時，將格式化並繪制軸標簽。

Answer 2

該塊將從以下位置開始：

for (i in dataframes) {  

與調用多少時間axis()有關系嗎？

我建議改行：

axis(side=1, at=axTicks(1), labels=formatC(axTicks(1), format="d", big.mark=','))  

在for循環之外，如下所示：

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=','))  

另外，您可以嘗試在對plot（）的其他調用中調用argumnent axes = F，以抑制x軸的多次繪制。

有關控制軸的更多信息，請參見此處的鏈接 。