title: how to print a string into a function?
body: <p>How I can put the variable "diti" inside the function specifyModel?</p>
  
  <pre><code>&gt; diti
  [1] " + mySMI(GSPC) + myCLV(GSPC) + myMACD(GSPC) + myrunMean(GSPC)"
  data.model &lt;- specifyModel(T.ind(GSPC) ~ Delt(Cl(GSPC),k=1) diti )
  Error: unexpected symbol in "data.model &lt;- specifyModel(T.ind(GSPC) ~ Delt(Cl(GSPC),k=1) diti"
  </code></pre>
  
  <p>it is seposed to look like this:</p>
  
  <pre><code>data.model &lt;- specifyModel(T.ind(GSPC) ~ Delt(Cl(GSPC),k=1) + mySMI(GSPC) +    myCLV(GSPC) + myMACD(GSPC) + myrunMean(GSPC) )
  </code></pre>
  
  <p>Thanks,</p>
  
  <p>Alon</p>