R help - Aug 2012 - Function definition: where is the error in the "for" loop?

Dear all,

The following function code fails with errors (see below):

RegPlots <- function (data, ContrVar, RespVar){
       intNmbrRows<-length(RespVar);intNmbrCols<-lenght(ContrVar)
       par(mfrow=c(intNmbrRows,intNmbrCols))
       For(i in 1:intNmbrRows){
           For (j in 1:intNmbrCols){
               RegGraf(data,ContrVar[i],RespVar[j])
           }
       }
       par(mfrow=c(1,1))

#(RegGraf is another function that creates a plot and that runs flawlessly)

Output (translated to english):
> RegPlots <- function (data, ContrVar, RespVar){
+     intNmbrRows<-length(RespVar);intNmbrCols<-lenght(ContrVar)
+     par(mfrow=c(intNmbrRows,intNmbrCols))
+     For(i in 1:intNmbrRows){
Error: Unexpected 'in' in:
"    par(mfrow=c(intNmbrRows,intNmbrCols))
       For(i in"
>         For (j in 1:intNmbrCols){
Error: Unexpected 'in' in "        For (j
in"
>             RegGraf(data,ContrVar[i],RespVar[j])
Error in RegGraf(data, ContrVar[i], RespVar[j]) :
     Object 'ContrVar' not found
>         }
Error: Unexpected '}' in "        }"
>     }
Error: Unexpected '}' in "    }"
>     par(mfrow=c(1,1))
Can someone please show me what is wrong?

Thanks in advance
Holger

Hello,

Generally those error messages refer to something that preceeds them. 
This is the current case: the parser is expecting a function's argument. 
The function name is 'For' with uppercase 'F'. The first
argument is
'i', then there should be a comma before a second argument.

The solution is obviously to write 'for', with lowercase 'f'.

Hope this helps,

Rui Barradas
Em 10-08-2012 22:15, Dr. Holger van Lishaut escreveu:
> Dear all,
>
> The following function code fails with errors (see below):
>
> RegPlots <- function (data, ContrVar, RespVar){
> intNmbrRows<-length(RespVar);intNmbrCols<-lenght(ContrVar)
>       par(mfrow=c(intNmbrRows,intNmbrCols))
>       For(i in 1:intNmbrRows){
>           For (j in 1:intNmbrCols){
>               RegGraf(data,ContrVar[i],RespVar[j])
>           }
>       }
>       par(mfrow=c(1,1))
>
> #(RegGraf is another function that creates a plot and that runs 
> flawlessly)
>
> Output (translated to english):
>
>> RegPlots <- function (data, ContrVar, RespVar){
> + intNmbrRows<-length(RespVar);intNmbrCols<-lenght(ContrVar)
> +     par(mfrow=c(intNmbrRows,intNmbrCols))
> +     For(i in 1:intNmbrRows){
> Error: Unexpected 'in' in:
> "    par(mfrow=c(intNmbrRows,intNmbrCols))
>       For(i in"
>>         For (j in 1:intNmbrCols){
> Error: Unexpected 'in' in "        For (j in"
>> RegGraf(data,ContrVar[i],RespVar[j])
> Error in RegGraf(data, ContrVar[i], RespVar[j]) :
>     Object 'ContrVar' not found
>>         }
> Error: Unexpected '}' in "        }"
>>     }
> Error: Unexpected '}' in "    }"
>>     par(mfrow=c(1,1))
>
> Can someone please show me what is wrong?
>
> Thanks in advance
> Holger
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.

There is no command "For" in R. It is "for" and R is case
sensitive.

----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Dr. Holger van Lishaut
> Sent: Friday, August 10, 2012 4:16 PM
> To: r-help at r-project.org
> Subject: [R] Function definition: where is the error in the "for"
loop?
> 
> Dear all,
> 
> The following function code fails with errors (see below):
> 
> RegPlots <- function (data, ContrVar, RespVar){
>        intNmbrRows<-length(RespVar);intNmbrCols<-lenght(ContrVar)
>        par(mfrow=c(intNmbrRows,intNmbrCols))
>        For(i in 1:intNmbrRows){
>            For (j in 1:intNmbrCols){
>                RegGraf(data,ContrVar[i],RespVar[j])
>            }
>        }
>        par(mfrow=c(1,1))
> 
> #(RegGraf is another function that creates a plot and that runs
> flawlessly)
> 
> Output (translated to english):
> 
> > RegPlots <- function (data, ContrVar, RespVar){
> +     intNmbrRows<-length(RespVar);intNmbrCols<-lenght(ContrVar)
> +     par(mfrow=c(intNmbrRows,intNmbrCols))
> +     For(i in 1:intNmbrRows){
> Error: Unexpected 'in' in:
> "    par(mfrow=c(intNmbrRows,intNmbrCols))
>        For(i in"
> >         For (j in 1:intNmbrCols){
> Error: Unexpected 'in' in "        For (j in"
> >             RegGraf(data,ContrVar[i],RespVar[j])
> Error in RegGraf(data, ContrVar[i], RespVar[j]) :
>      Object 'ContrVar' not found
> >         }
> Error: Unexpected '}' in "        }"
> >     }
> Error: Unexpected '}' in "    }"
> >     par(mfrow=c(1,1))
> 
> Can someone please show me what is wrong?
> 
> Thanks in advance
> Holger
> 
> ______________________________________________
> R-help at r-project.org mailing list
> 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.