title: Error ggplot (Error in seq.int(0, to0 - from, by) : 'to' must be finite)
body: <p>For plotting the data with <code>ggplot2</code>, I have faced with following error.
  The commands, data and error types are available as following:</p>
  
  <pre><code>require(ggplot2)
  require(reshape2)
  df &lt;- data.frame(HMn25_30$avg,dt_hmn$dt)
  
  df[3] = c(   "Normal",   "Normal",
               "Normal",
               "Normal",
               "Normal",
               "Normal",
               "Normal",
               "Normal",
               "Normal",
               "Normal",
               "Outlier",
               "Outlier",
               "Outlier",
               "Outlier",
               "Outlier",
               "Outlier",
               "Normal",
               "Outlier",
               "Outlier",
               "Normal",
               "Normal",
               "Outlier",
               "Outlier",
               "Normal",
               "Normal"
  )
  names(df)[1] &lt;- 'Node 25'
  names(df)[3] &lt;-'Results'
  df.m &lt;- melt(df, names(df)[2:3], names(df)[1])
  df.m$Results &lt;- factor(df.m$Results)
  df.m$dt_hmn.dt &lt;- strptime(as.character(df.m$dt_hmn.dt), format = "%Y-%m-%d %H:%M")
  p &lt;- ggplot(df.m, aes(x = dt_hmn.dt, y = value, group = variable, color = variable))
  p &lt;- p + scale_shape_manual(values=c(27,20))
  p &lt;- p + geom_point(aes(shape = Results), cex=13, color= "blue")
  p &lt;- p + theme(axis.text.x = element_text(angle = 90, hjust = 1, size=13,color="darkred"))
  p &lt;- p + scale_color_manual(values=c("Red"))
  p &lt;- p + ylim(-1,8)
  p &lt;- p + theme_bw()
  p &lt;- p + xlab('Date and Time') 
  p &lt;- p + ylab('Temprature') 
  p &lt;- p + ggtitle("Temporal Outliers of Node 25 ") + theme(plot.title = element_text(lineheight=3, face="bold", color="black", size=29))
      p
  </code></pre>
  
  <p>And the data are:</p>
  
  <pre><code>HMn25_30$avg
   [1]  0.280  0.208 -0.264 -0.480 -0.708 -0.714 -0.498 -0.216  0.126  0.574  1.042  1.086  1.820
  [14]  4.570  3.808  7.400  5.572  5.402  6.288  4.966  5.180  2.380  4.710  5.366  4.766
  
  dt_hmn$dt
   [1] 9/29/2007 23:00 9/30/2007 0:00  9/30/2007 1:00  9/30/2007 2:00  9/30/2007 3:00 
   [6] 9/30/2007 4:00  9/30/2007 5:00  9/30/2007 6:00  9/30/2007 7:00  9/30/2007 8:00 
  [11] 9/30/2007 9:00  9/30/2007 10:00 9/30/2007 11:00 9/30/2007 12:00 9/30/2007 13:00
  [16] 9/30/2007 14:00 9/30/2007 15:00 9/30/2007 16:00 9/30/2007 17:00 9/30/2007 18:00
  [21] 9/30/2007 19:00 9/30/2007 20:00 9/30/2007 21:00 9/30/2007 22:00 9/30/2007 23:00
  </code></pre>
  
  <p>I have faced the following error:</p>
  
  <pre><code>Error in seq.int(0, to0 - from, by) : 'to' must be finite
  </code></pre>