[R] Problem with cat() == A related question

[Peng, C]

It is still visible even it is set invisible(NULL):

>  fn1 <- function(n = 5){ 
+  mat <- matrix(rnorm(5*5), 5, 5) 
+   cat(print(mat)) 
+  invisible(NULL)} 
> fn1()
            [,1]        [,2]       [,3]        [,4]       [,5]
[1,] -1.22767085 -1.41468587 -2.0156231  0.29732942  0.5755600
[2,] -0.16775996 -0.03780596 -0.9461079  0.91289175  0.1254273
[3,]  0.09696032 -0.75522210 -0.7494442 -0.21341669  1.7088194
[4,]  0.13535505 -1.09011005 -0.6074198  0.05342614 -1.1996344
[5,]  0.66474083 -2.62206248  0.1329972  0.06132865  0.5124778
-1.227671 -0.1677600 0.09696032 0.1353550 0.6647408 -1.414686 -0.03780596
-0.7552221 -1.09011 -2.622062 -2.015623 -0.9461079 -0.7494442 -0.6074198
0.1329972 0.2973294 0.9128917 -0.2134167 0.05342614 0.06132865 0.57556
0.1254273 1.708819 -1.199634 0.5124778> 
> 
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