Why does this happen?
plot(x,y) yx.lm <- lm(y ~ x) lines(x, predict(yx.lm), col="red")
plot.xy(xy.coords(x, y), type = type, ...):
plot.newhas not been called yet
Some action, very possibly not represented in the visible code, has closed the interactive screen device. It could be done either by a “click” on a close-button. (Could also be done by an extra dev.off() when plotting to a file-graphics device. This may happen if you paste in a mult-line plotting command that has a dev,off() at the end of it but errors out at the opening of the external device but then has hte dev.off() on a separate line so it accidentally closes the interactive device).
Some (most?) R implementations will start up a screen graphics device open automatically, but if you close it down, you then need to re-initialize it. On Windows that might be
window(); on a Mac,
quartz(); and on a linux box,
x11(). You also may need to issue a
plot.new() command. I just follow orders. When I get that error I issue
plot.new() and if I don’t see a plot window, I issue
quartz() as well. I then start over from the beginning with a new
plot(., ., ...) command and any further additions to that plot screen image.
In my case, I was trying to call
plot(x, y) and
lines(x, predict(yx.lm), col="red") in two separate chunks in Rmarkdown file. It worked without problems when running chunk by chunk, but the corresponding document wouldn’t knit. After I moved all plotting calls within one chunk, problem was resolved.
As a newbie, I faced the same ‘problem’.
In newbie terms :
when you call
plot(), the graph window gets the focus and you cannot enter further commands into R. That is when you conclude that you must close the graph window to return to R.
However, some commands, like
identify(), act on open/active graph windows.
identify() cannot find an open/active graph window, it gives this error message.
However, you can simply click on the R window without closing the graph window. Then you can type more commands at the R prompt, like
plot.new() error occurs when only part of the function is ran.
I had the same problem… my problem was that I was closing my quartz window after plot(x,y). Once I kept it open, the lines that previously resulted in errors just added things to my plot (like they were supposed to). Hopefully this might help some people who arrive at this page.
If someone is using
and then print with
newpage = F
print(data, newpage = F)