Hello. I'm a newbie here.
In my script (I name it readData.R), I wrote the followings:
readData <-function(){ med = read.csv("medicalData.csv");}
Then I tested the script by 'Source R Code' then on the command I typed
'readData()' then I typed 'med' to check if the variable
contains the medical data but it returned 'Object med is not found'.
What did I do wrong? Please help.
Cheers,Suhaila
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Hi Suhaila,
You don't need to make a function: your script should just contain:
med <- read.csv("medicalData.csv")
If you do want to make a function, then you need to assign the
resulting value to something, eg:
med <- readData()
but there's no reason to do that. Values that are assigned within a
function don't persist in the global environment.
Sarah
On Mon, May 7, 2012 at 1:41 PM, Suhaila Haji Mohd Hussin
<bell_beauty12 at hotmail.com> wrote:>
> Hello. I'm a newbie here.
> In my script (I name it readData.R), I wrote the followings:
> readData <-function(){ ?med = read.csv("medicalData.csv");}
> Then I tested the script by 'Source R Code' then on the command I
typed 'readData()' then I typed 'med' to check if the variable
contains the medical data but it returned 'Object med is not found'.
What did I do wrong? Please help.
> Cheers,Suhaila
--
Sarah Goslee
http://www.functionaldiversity.org
R is a functional language so, by default, assignments (and other
things) within function scope doesn't have global effects. This is
generally considered a _very good thing_ in language design. You'd
perhaps prefer something like:
readData <- function() {
read.csv("medialData.csv")
}
med <- readData()
which will have the desired outcome.
On Mon, May 7, 2012 at 1:41 PM, Suhaila Haji Mohd Hussin
<bell_beauty12 at hotmail.com> wrote:>
> Hello. I'm a newbie here.
> In my script (I name it readData.R), I wrote the followings:
> readData <-function(){ ?med = read.csv("medicalData.csv");}
> Then I tested the script by 'Source R Code' then on the command I
typed 'readData()' then I typed 'med' to check if the variable
contains the medical data but it returned 'Object med is not found'.
What did I do wrong? Please help.
> Cheers,Suhaila
> ? ? ? ?[[alternative HTML version deleted]]
>
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http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
On 07-05-2012, at 19:41, Suhaila Haji Mohd Hussin wrote:> > Hello. I'm a newbie here. > In my script (I name it readData.R), I wrote the followings: > readData <-function(){ med = read.csv("medicalData.csv");} > Then I tested the script by 'Source R Code' then on the command I typed 'readData()' then I typed 'med' to check if the variable contains the medical data but it returned 'Object med is not found'. What did I do wrong? Please help.Have a look at section 10.5 "Assignment within functions" of the "An Introduction to R " manual. Berend