My data is titled "data2" and a summary screenshot is shown.

I'd simply like a histogram showing the mean value of each variable. The x-axis would be 1,2,3 where 1=variable 1 (clopidogrel), 2=variable 2 (mortality score), etc. The y-axis is 0 to the max mean from the data which is the height value. I guess I could set var1=mean(var1), var2= ...etc and plot these, but is there a faster process?

Code: hist(colMeans(data2),ylab=(0,max(mean(data2))) <---doesn't work