Code without visible output:



In [1]:

    
a <- 8



In [2]:

    
b <- 4:59

With visible output:



In [3]:

    
a + b

Printing is captured and sent to the frontend:



In [4]:

    
print('Hello world! Love, R in Jupyter.')









    



[1] "Hello world! Love, R in Jupyter."

So are errors:



In [5]:

    
f2 <- function() stop('deep error')
throw <- function() f2()



In [6]:

    
'this line is run / displayed'
throw()
'this line is not run / displayed'









    Out[6]:




'this line is run / displayed'






    



Error in f2(): deep error
Traceback:

1. throw()
2. f2()   # at line 2 of file <text>
3. stop("deep error")   # at line 1 of file <text>

Plotting works too:



In [7]:

    
x <- seq(0, 2*pi, length.out=50)
plot(x, sin(x))