I am pretty sure that this is an R problem that occurs because of linked 
cells.  Look 
at http://faculty.sfasu.edu/judsontw/math-s304/section-16.html.  The first 
plot works fine, but somehow I need to clear the previous graphics when I 
create a new plot.  I have tried dev.off() and graphics.off(), but neither 
works.  Any ideas?

On Thursday, July 20, 2017 at 12:53:35 AM UTC+2, Andrey Novoseltsev wrote:
>
> On Wednesday, 19 July 2017 05:23:00 UTC-6, Thomas Judson wrote:
>>
>> The following code works in CoCalc
>>
>> cases <- c(36, 531, 4233, 8682, 7164, 2229, 600, 164, 57, 722, 1517, 
>> 1828, 1539, 2416, 3148, 3465, 1440)
>> deaths <- c(0, 0, 130, 552, 738, 414, 198, 90, 56, 50, 71, 137, 178, 194, 
>> 290, 310, 149) 
>> plot(ts(cases), col="red", main="Influenza Epidemic")
>> lines(ts(10*deaths),col="blue”)
>>
>> However, I get the following error when I try to plot this in a Sage cell
>>
>> Error in plot.new() : cairo error 'error while writing to output stream'
>> Error in plot.xy(xy.coords(x, y), type = type, ...) : 
>>   plot.new has not been called yet
>>
>>
>> I may or may not get the plot.
>>
>>
>> Other R plots seem to work in the Sage cells.  Any ideas?
>>
>>
>> Tom
>>
>>
>>
> I've tried it ten times or so and got the plot with no errors every time. 
> Can you reproduce it in your setup reliably? I don't have any clue what can 
> be wrong here that it works sometimes but not always...
>

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