title: How to use sliderInput to to input more than 2 values in Rshiny
body: <p>Traditionally, a sliderInput function is</p>
  
  <pre><code>sliderInput(inputId, label, min, max, value, step = NULL, round = FALSE, format = NULL, 
  locale = NULL, ticks = TRUE, animate = FALSE, width = NULL, sep = ",", 
  pre = NULL, post = NULL, timeFormat = NULL, timezone = NULL, dragRange = TRUE)
  </code></pre>
  
  <p>If I specify </p>
  
  <pre><code>sliderInput("range","range",min=-3,max=3,value=c(-1,1))
  </code></pre>
  
  <p>it input a range from -1 to 1. However, there is a function takes an argument format as days_included=c(-2,-1,0,1,2). In this case, I cannot make this function work if I set</p>
  
  <pre><code>sliderInput("range","range",min=-3,max=3,value=c(-2,2)) 
  </code></pre>
  
  <p>since it doesn't really match the required format. So this is my question, anyway to make this function work? I tried "step" argument inside sliderInput but failed.   </p>