On 08/08/2010 08:47 PM, Stephen Liu wrote: > Hi folks, > >> x > [1] 1 2 3 4 5 >> y > [1] 6 7 8 9 10 > >> plot(x,y, type = "1" ) > Error in plot.xy(xy, type, ...) : invalid plot type '1' > > > I looked on man plot but unable to resolve. Please help. TIA You never say what you expect type = "1" (that's the digit "1") to do. Did you mean "l" instead of "1"?