# 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")比如以上代码没有错,但是就是输不出来图片,为什么?
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