Divide the values in one column by those in another column in R
<p>I have read how to divide the values in one column by those in another column in R. But I want to know how to divide the values in multiple columns by the values in a single column. Also my first column is composed of non-numerics. How do a write a script in R to do all this and avoid the non-numeric?</p>

<p>I want to divide <code>HDL</code> and <code>HDW</code> by <code>SVL</code> in the .csv doc below</p>

<pre><code>species SVL      HDL    HDW
PM     26.68    9.27    9.83
PM     23.46    8.41    8.59
PM     24.15    8.36    8.1
PM     23.09    8.91    8.79
Tioman 31.8    11.65    11.18
Tioman 29      10.88    10.66
</code></pre>