[R] Problems plotting date and time column from excel using R

[David Winsemius]

On May 11, 2010, at 9:00 AM, Terry Bassett wrote:

> I am using R to read from an excel(csv) file. Within the excel file  
> is a column with the date set that looks likes this:
>
>  53:40.2
> and in the Insert function box it looks likes this:
> 9/21/2006  4:53:40 PM

This is really an Excel question, rather than an R one. You need to  
format the data in Excel so that it gets output to the CSV properly.

>
> I tired separating the time and date using the function below and  
> then plotting again which fail to read properly
> =TEXT(B2,"hh:mm:ss")   and  =TEXT(B9,"mm/dd/yyyy")

As I said, it's an Excel question.

>
> The R script am using is
> plot.time_vs_id<- function(start,end){
> setwd("C:/Documents and Settings/terry/Desktop/r_stuff")
> x=read.table("MAV.csv",header=T, sep=",")
> plot(x$time[start:end],x$packet_id[start:end],ylab="Packet ID",  
> xlab="Time", type="p")
> }
>
> and
> plot.hov_Points <- function(start,end){
> setwd("C:/Documents and Settings/terry/Desktop/r_stuff")
> library(rgl)
> t=read.table("MAV.csv",header=T, sep=",")
> plot3d(t$time[start:end],t$packet_length[start:end],t 
> $date[start:end], main="potential", xlab="time",  
> ylab="length",zlab="date", type="p")
> }
>
> How can i get R to properly display the time in my graphs
>
> Thanks
> Terry Bassett
>


David Winsemius, MD
West Hartford, CT