drawdata: Add mean and s.e.m to a log10 or natural plot
In log10: Decimal log plotting in two and three dimensions

Add mean and s.e.m to a log10 or natural plot, where means are plotted as a dot and the range (sem) is plotted as an arrow. Whenever x values are found several time, the mean and sem of corresponding y values are calculated.

1 2	drawdata(x,y,pch=23,bg='white',lty=1,col=bg,log='')

`x`	The x points, as a vector
`y`	The y points, as a vector
`pch`	The point used to represent mean
`bg`	The mean point color
`lty`	Type of the line to link mean points
`col`	Color of the line
`log`	Either 'x', 'y', 'xy', or ”