title: How to expand colour palette in ggplot2
body: <p>Hi everybody I am making a graphic in ggplot2 but I wish to add different colour to it. One way is to use palette from <code>RColorBrewer</code> package. I used a palette from this package but I got this. The code that I used is the next:</p>
  
  <pre><code>library(ggplot2)
  library(reshape2)
  library(scales)
  library(RColorBrewer)
  #Graphic
  png(filename = "Atotal.png", width = 1050, height = 900)
  Atotal=ggplot(Melt.Atotal, aes(x = Var2, y = value, fill = Mes)) +
    geom_bar(stat = "identity") + scale_y_continuous(labels = comma) + scale_fill_brewer(palette="Set3") +
    annotate("text", x = ncol(AtotalM) - 1.3, y = finalValA1 + 4000000, 
             label = finalValA1f, size = 5) + theme(axis.text.x=element_text(angle=90,colour="grey20",face="bold"),axis.text.y=element_text(colour="grey20",face="bold",hjust=1,vjust=0.8),axis.title.x=element_text(colour="grey20",face="bold"),axis.title.y=element_text(colour="grey20",face="bold"))+xlab('Mes')+ylab('Total')+ ggtitle("Consumo Automotriz (A)")+theme(plot.title = element_text(lineheight=3, face="bold", color="black",family="F",size=24))
  print(Atotal)
  dev.off()
  </code></pre>
  
  <p>The result of using <code>scale_fill_brewer(palette="Set3")</code> inside this code is the next:</p>
  
  <p><img src="https://i.stack.imgur.com/lI54v.png" alt="enter image description here"></p>
  
  <p>Where not all values of <code>Mes</code> are being considered. My data is <code>Melt.Atotal</code> and it has 3 variables <code>Mes</code>, <code>Var2</code> and <code>Value</code>. The code to build  <code>Melt.Atotal</code> is the next (I add <code>dput()</code> version of my basic matrix):</p>
  
  <pre><code>Melt.Atotal &lt;- melt(AtotalMt)
  Melt.Atotal&lt;-transform(Melt.Atotal, Var1 = factor(Var1, colnames(AtotalMt)),
                         Var2 = factor(Var2, rownames(AtotalMt)))
  names(Melt.Atotal)[1] &lt;- "Mes"
  </code></pre>
  
  <p>The <code>dput()</code> version of <code>AtotalMt</code> is the next:</p>
  
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  )))
  </code></pre>
  
  <p>Thanks for your help.</p>