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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