[R] simple question on data frames assignment

[ruipbarradas at sapo.pt]

Hello,

   You're right, sorry, I missed the parenthesis:

   colordata$response <- (colordata$color == 'blue') + 0

   Rui Barradas

Quoting Michael Artz <michaeleartz at gmail.com>:
> Fyi, This statement returned the following error    
> 'Error in "Yes" + 0 : non-numeric argument to binary operator'
>
>
> On Thu, Apr 7, 2016 at 8:43 AM, <ruipbarradas at sapo.pt> wrote:
>>
>> Hello,
>>
>>        Or even simpler, without ifelse,
>>
>>        colordata$response <- colordata$color == 'blue' + 0
>>
>>        Hope this helps,
>>
>>        Rui Barradas
>>         
>>
>> Citando David Barron <dnbarron at gmail.com>:
>>>
>>> ifelse is vectorised, so just use that without the loop.
>>>
>>>           colordata$response <- ifelse(colordata$color == 'blue', 1, 0)
>>>
>>>           David
>>>
>>>           On 7 April 2016 at 12:41, Michael Artz  
>>> <michaeleartz at gmail.com> wrote:
>>>>
>>>> Hi I'm not sure how to ask this, but its a very easy question to  
>>>> answer for
>>>>            an R person.
>>>>
>>>>            What is an easy way to check for a column value and  
>>>> then assigne a new
>>>>            column a value based on that old column value?
>>>>
>>>>            For example, Im doing
>>>>            colordata <- data.frame(id = c(1,2,3,4,5), color =  
>>>> c("blue", "red",
>>>>            "green", "blue", "orange"))
>>>>            for (i in 1:nrow(colordata)){
>>>>               colordata$response[i] <-  
>>>> ifelse(colordata[i,"color"] == "blue", 1, 0)
>>>>            }
>>>>
>>>>            which works,  but I don't want to use the for loop I  
>>>> want to "vecotrize"
>>>>            this.  How would this be implemented?
>>>>
>>>>                    [[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.htmland provide commented,  
>>> minimal, self-contained, reproducible code.
>>
>>
>>         
>>
>>
>
>
>

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