## R语言 条形图

2017-07-21

https://www.w3cschool.cn/r/r_bar_charts.html

## 语法

barplot(H, xlab, ylab, main, names.arg, col)

• H是包含在条形图中使用的数值的向量或矩阵。

• xlab是x轴的标签。

• ylab是y轴的标签。

• main是条形图的标题。

• names.arg是在每个条下出现的名称的向量。

• col用于向图中的条形提供颜色。

## 例

# Create the data for the chart.
H <- c(7,12,28,3,41)

# Give the chart file a name.
png(file = "barchart.png")

# Plot the bar chart.
barplot(H)

# Save the file.
dev.off()

## 例

# Create the data for the chart.
H <- c(7,12,28,3,41)
M <- c("Mar","Apr","May","Jun","Jul")

# Give the chart file a name.
png(file = "barchart_months_revenue.png")

# Plot the bar chart.
barplot(H,names.arg = M,xlab = "Month",ylab = "Revenue",col = "blue",
main = "Revenue chart",border = "red")

# Save the file.
dev.off()

## 组合条形图和堆积条形图

# Create the input vectors.
colors <- c("green","orange","brown")
months <- c("Mar","Apr","May","Jun","Jul")
regions <- c("East","West","North")

# Create the matrix of the values.
Values <- matrix(c(2,9,3,11,9,4,8,7,3,12,5,2,8,10,11),nrow = 3,ncol = 5,byrow = TRUE)

# Give the chart file a name.
png(file = "barchart_stacked.png")

# Create the bar chart.
barplot(Values,main = "total revenue",names.arg = months,xlab = "month",ylab = "revenue",
col = colors)

# Add the legend to the chart.
legend("topleft", regions, cex = 1.3, fill = colors)

# Save the file.
dev.off()

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