hadley/gtable — comment on commit c6dd5e82576059f6b604b5bb49ffaab03fac8092
File: man/gtable.Rd line 90
By baptiste:

plot(b[1,]) and plot(b[,1]) fail (as they probably should) with an unfriendly message,

Error in vp[1L:(length(vp) - 1)] :
only 0's may be mixed with negative subscripts