title: ggplot Error: Don't know how to automatically pick scale for object of type function
body: <p>I plotted a stacked bar graph in R using ggplot2 package, </p>
  
  <pre><code> data&lt;-read.table("K.txt",header=TRUE, sep="\t")
  &gt; data
    Sample   P1   P2   P3   P4
  1     G1 0.02 0.01 0.03 0.95
  2     G2 0.01 0.01 0.02 0.97
  3     G3 0.01 0.01 0.02 0.97
  4     G4 0.01 0.01 0.02 0.97
  5     G5 0.01 0.01 0.02 0.96
  6     G6 0.01 0.01 0.01 0.98
  7     G7 0.05 0.01 0.01 0.93
  8     G8 0.34 0.01 0.01 0.64
  9     G9 0.43 0.01 0.01 0.56
  &gt; library("reshape2", lib.loc="C:/Program Files/R/R-2.15.2/library")
  &gt; data1&lt;-melt(data)
  Using Sample as id variables
  &gt; head(data1)
     Sample variable value
  1      G1       P1  0.02
  2      G2       P1  0.01
  3      G3       P1  0.01
  4      G4       P1  0.01
  5      G5       P1  0.01
  &gt; library("ggplot2", lib.loc="C:/Program Files/R/R-2.15.2/library")
  ggplot(data=data1, aes(x=sample, y=value, fill=variable))+geom_bar(width=1)+scale_y_continuous(expand = c(0,0))+ opts(axis.text.x=theme_text(angle=90))
  Don't know how to automatically pick scale for object of type function. Defaulting to continuous
  Error in data.frame(x = function (x, size, replace = FALSE, prob = NULL)  : 
    arguments imply differing number of rows: 0, 36
  </code></pre>
  
  <p>Can any1 help me to sort out this error?</p>
  
  <p>Many thanks
  Ramesh</p>