title: R: ggplot set ylim with custom break
body: <p>I want to customize the gap (breaks) in the y axis of the plot. I tried two options.</p>
  
  <pre><code>option1: ylim(0.0,0.6) 
  option2: scale_y_continuous(breaks=seq(0.0, 0.6, 0.1))
  </code></pre>
  
  <p>Problem with the option1 is that it breaks in every 0.2 up to limit of y axis which is 0.6.
  <img src="https://i.stack.imgur.com/dmzEN.png" alt="Example of problem1">
  Problem with the option2 is that it gives this illusion of drastic difference between plots since it enlarge the 0.1 segment of the plot. 
  <img src="https://i.stack.imgur.com/1AwyB.png" alt="Example of problem2"></p>
  
  <p>What I want is y-axis to be break at every 0.1 or customize it to any break while showing the max limit of the y-axix (in this case 0.0 to 0.6 but break every 0.1).</p>
  
  <pre><code>xVal = c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15)
  a = c(0.18340368127959822, 0.17496531617798133, 0.16772886654445848, 0.15934821062512169, 0.15390913489444036, 0.14578798884106348, 0.14524174121702108, 0.13958093302847951, 0.1365009715515553, 0.13337340345559975, 0.12995175856952607, 0.12583603207983862, 0.12180656145228715, 0.11824179486798418, 0.11524630600365712)
  b = c(0.13544353787855531, 0.11345498050033079, 0.11449834060237293, 0.10479213576778054, 0.09677430524414686, 0.091990671548439179, 0.089965934807318487, 0.088711600335474206, 0.088923403079789909, 0.087989321310275717, 0.085424600757017272, 0.08251334730889931, 0.080178280060313953, 0.077717041621392688, 0.076638743116633837)
  c = c(0.087351324973658093, 0.12113308515702567, 0.11422800742900453, 0.11264309199970789, 0.11390287790920843, 0.10774426268894192, 0.10587704437111881, 0.10474954948318291, 0.10568277685778472, 0.10201545270338952, 0.09939827283775747, 0.098062403381144761, 0.094110034623398231, 0.091211408116407641, 0.089369778116029489)
  
  library(ggplot2)
  library(reshape2)
  
  df = data.frame(xVal, a, b, c)
  df.melt = melt(df, id="xVal")
  </code></pre>
  
  <p>problem1:</p>
  
  <pre><code>ggplot(data=df.melt, aes(x=xVal, y=value, colour=variable)) +
              geom_point() + 
              geom_line() + 
              xlab("xVal") + ylab("YValues") + xlim(1,16) +  
              ylim(0.0,0.6)
  </code></pre>
  
  <p>problem2:</p>
  
  <pre><code>ggplot(data=df.melt, aes(x=xVal, y=value, colour=variable)) + 
              geom_point() + 
              geom_line() + 
              xlab("xVal") + ylab("YValues") + xlim(1,16) + 
              scale_y_continuous(breaks=seq(0.0, 0.6, 0.1))
  </code></pre>
  
  <p>How do I customize the y-axis such that break according to a value that I specify.</p>