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Question about image() behavior
2 messages · Justin McGrath, Duncan Murdoch
On 25/11/2009 3:00 PM, Justin McGrath wrote:
If the x vector has a gap, then image() fills in those spots using the z value of the nearest x value. I had expected it to just leave those spaces blank though. For example x=c(1:5,100:105) y=c(1:10) z=matrix(rnorm(100),10,10) image(x,y,z) I expected that to produce a figure with a wide vertical gap between x=5 and x=100. Is this the correct behavior? Could there be an option added to choose between these two behaviors? Either way, it should be stated in the documentation.
It's doing what is documented. Giving uneven spacing to x values just says that the rectangles being coloured by the z values are not square. If you want to leave blanks, then put in NA values for z. For example, x <- c(1:6, 100:105) y <- 1:10 z <- matrix(rnorm(110), 11, 10) z[6,] <- NA image(x,y,z) Duncan Murdoch