On Tue, 4 Jan 2005, Dan Bolser wrote:
>On 4 Jan 2005, Peter Dalgaard wrote:
>
>>Dan Bolser <[EMAIL PROTECTED]> writes:
>>
>>> I am trying the following code...
>>>
>>> for(i in 1:bins){
>>> print(cat(c(i, length(var1[var1==i]))))
>>> }
>>>
>>> Where var1 is a vector with zero or more values = {1, 2, ..., bins} (or
>>> something like that).
>>>
>>> The result I get is...
>>>
>>> 1 33NULL
>>> 2 28NULL
>>............
>>> 19 0NULL
>>> 20 3NULL
>>>
>>> I don't know what I am doing to get those stray NULL characters printed.
>>
>>You're printing them, will you believe it...?
>>
>>Consider this:
>>
>>> x <- cat("abc")
>>abc> print(x)
>>NULL
>>> x
>>NULL
>>> print(cat("abc"))
>>abcNULL
>>
>>I.e. cat() always returns NULL, invisibly unless you force it to be
>>printed.
>
>never trust a cat!
I meant to add that this was causing me problems when trying to create a
file name for use with the png command.
png tries to create a 'NULL' file name, and returns a rather cryptic
message...
Error in X11(paste("png::", filename, sep = ""), width, height, pointsize,:
unable to start device PNG
In addition: Warning message:
could not open PNG file `'
>
However, the warning provides the answer to the problem... use paste
instead of cat.
Cheers,
Dan.
>
>>
>>
>>
>
>
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