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In R some functions can print information and return values, can the print be silenced?
For example:
print.and.return <- function() {
print("foo")
return("bar")
}
returns
> print.and.return()
[1] "foo"
[1] "bar"
>
I can store the return like:
> z <- print.and.return()
[1] "foo"
> z
[1] "bar"
>
Can I suppress the print of "foo"?
258
However, R does have a print() function available if you want to use it. This might be useful if you are familiar with other programming languages, such as Python, which often uses the print() function to output code.
The simple printing method in R is to use print() . As its name indicates, this method prints its arguments on the R console. However, cat() does the same thing but is valid only for atomic types (logical, integer, real, complex, character) and names, which will be covered in the later chapters.
We can make the output should not appear. By using invisible() function we can suppress the output.
The difference between: paste and paste0 is that paste function provides a separator operator, whereas paste0 does not. print ()- Print function is used for printing the output of any object in R. This recipe demonstrates an example on paste, paste0 and print function in R.
?capture.output
You may use hidden functional nature of R, for instance by defining function
deprintize<-function(f){
return(function(...) {capture.output(w<-f(...));return(w);});
}
that will convert 'printing' functions to 'silent' ones:
noisyf<-function(x){
print("BOO!");
sin(x);
}
noisyf(7)
deprintize(noisyf)(7)
deprintize(noisyf)->silentf;silentf(7)
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