From ee0075c98998e42eef031cd41ed8f8bb403b47ed Mon Sep 17 00:00:00 2001
From: ranke <ranke@d1b72e20-2ee0-0310-a1c4-ad5adbbefcdc>
Date: Mon, 2 Jan 2006 23:27:32 +0000
Subject: A fix for a bug that kept drplot from plotting if no control data are
 present in the dose-response data frame.

git-svn-id: http://kriemhild.uft.uni-bremen.de/svn/drfit@55 d1b72e20-2ee0-0310-a1c4-ad5adbbefcdc
---
 R/drfit.R | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/R/drfit.R b/R/drfit.R
index ac3ad3e..9eee87a 100644
--- a/R/drfit.R
+++ b/R/drfit.R
@@ -34,7 +34,6 @@ drdata <- function(substances, experimentator = "%", db = "cytotox",
     odbcClose(channel)
     names(data)[[1]] <- "dose"
     names(data)[[2]] <- "response"
-    data$dosefactor <- factor(data$dose)
     data$substance <- factor(data$substance,levels=substances)
     return(data)
 }
@@ -308,9 +307,9 @@ drplot <- function(drresults, data,
         nonzerodata$substance <- factor(nonzerodata$substance) # Get rid of pseudo substance names of controls
         zerodata <- subset(data,dose==0)
         nc <- length(zerodata$dose)     # Number of control points
-        sdc <- sd(zerodata$response)    # Standard deviation of control responses
-        controlconf <- sdc * qt((1 + alpha)/2, nc - 1) / sqrt(nc)
         if (nc > 0) {
+            sdc <- sd(zerodata$response)    # Standard deviation of control responses
+            controlconf <- sdc * qt((1 + alpha)/2, nc - 1) / sqrt(nc)
             cat("There are ",nc,"data points with dose 0 (control values)\n")
             cat("with a standard deviation of",sdc,"\n")
             cat("and a confidence interval of",controlconf,"\n")
-- 
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