[R] include

[Duncan Murdoch]

On 24/02/2018 1:53 PM, William Dunlap via R-help wrote:
>     x1 =  rbind(unique(preval),mydat)
>    x2 <- x1[is.na(x1)] <- 0
>    x2  # gives 0
> 
> Why introduce the 'x2'?   x1[...] <- 0 alters x1 in place and I think that
> altered x1 is what you want.
> 
> You asked why x2 was zero.  The value of the expression
>     f(a) <- b
> and assignments are processed right to left so
>     x2 <- x[!is.na(x1)] <- 0
> is equivalent to
>     x[!is.na(x1)] <- 0
>     x2 <- 0

That's not right in general, is it?  I'd think that should be

     x[!is.na(x1)] <- 0
     x2 <- x1

Of course, in this example, x1 is 0, so it gives the same answer.

Duncan Murdoch

> 
> 
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
> 
> On Sat, Feb 24, 2018 at 9:59 AM, Val <valkremk at gmail.com> wrote:
> 
>> Thank you Jim
>>
>> I wanted a final data frame  after replacing the NA's to "0"
>>
>> x1 =  rbind(unique(preval),mydat)
>> x2 <- x1[is.na(x1)] <- 0
>> x2
>>   but I got this,
>>
>> [1] 0
>>
>> why I am getting this?
>>
>>
>> On Sat, Feb 24, 2018 at 12:17 AM, Jim Lemon <drjimlemon at gmail.com> wrote:
>>
>>> Hi Val,
>>> Try this:
>>>
>>> preval<-data.frame(Col1=unique(unlist(mydat[,c("Col2","col3")]))[-1],
>>>   Col2=NA,col3=NA)
>>> rbind(preval,mydat)
>>>
>>> Jim
>>>
>>> On Sat, Feb 24, 2018 at 3:34 PM, Val <valkremk at gmail.com> wrote:
>>>> Hi All,
>>>>
>>>> I am reading a file as follow,
>>>>
>>>> mydat <- read.table(textConnection("Col1 Col2 col3
>>>> Z2 NA NA
>>>> Z3 X1 NA
>>>> Z4 Y1 W1"),header = TRUE)
>>>>
>>>> 1. "NA" are   missing  should be replace by 0
>>>> 2.  value that are in COl2 and Col3  should be included  in col1 before
>>>> they appear
>>>> in col2 and col3. So the output data looks like as follow,
>>>>
>>>> X1  0  0
>>>> Y1  0  0
>>>> W1  0  0
>>>> Z2  0  0
>>>> Z3 X1  0
>>>> Z4 Y1 W1
>>>>
>>>> Thank you in advance
>>>>
>>>>          [[alternative HTML version deleted]]
>>>>
>>>> ______________________________________________
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>>> posting-guide.html
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>>>
>>
>>          [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/
>> posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>