plot new has not been called yet

Question

Why does this happen   plot x y  yx lm  lt - lm y   x  lines x  predict yx lm   col  red        Error in plot xy xy coords x  y   type   type                  plot new has not been called yet

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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

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If someone is using print function  for example  with mtext   then firstly depict a null plot   plot 0 type  n  axes FALSE ann FALSE    and then print with newpage   F  print data  newpage   F

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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

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plot new   error occurs when only part of the function is ran   Please find the attachment for an example to correct error With error    When abline is ran without plot   above  Error-free    When both plot and abline ran together

User · Answer

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  When 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 identify   etc

User · Answer

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

[r] plot.new has not been called yet

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