[R] incorrect number of dimensions

[David L Carlson]

Look below to see what happens to your formatting when you use html. Don't use html.

Why do you use x='df' in defining the function

df is a data frame with 5 observations and 4 variables.
'df' is a character vector of length 1. Your function is looking for a data frame (or matrix) with at least 4 columns.

-------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Marie-Eve St-Onge
Sent: Thursday, September 11, 2014 10:53 AM
To: r-help at r-project.org
Subject: [R] incorrect number of dimensions

Dear all, I'm trying the following experiment simulation, but I'm receiving this error:
> probs()Error in x[j, 4] : incorrect number of dimensions
however, the simulation works fine outside the function statement{}. What am I doing wrong?
# Create some fake data and call the function: df <- data.frame(y1 = rpois(5, 9),y2 = rpois(5, 7), y3 = rpois(5, 8), n = rpois(5, 100)) 
probs = function(x='df', j=5, export=1){  p=gtools::rdirichlet(100000, x[j,4] * c(x[j,1],x[j,2],x[j,3], 1-x[j,1]-x[j,2]-x[j,3])/100+1 )if(export==1){  mean(p[,1] > p[,3])} else {  return(p)} }

Eve

 		 	   		  
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