Addresses format command in Octave #477 in EV5 when matrices get large.

source/linear-algebra/source/02-EV/05.ptx

@@ -244,7 +244,12 @@ In particular, the standard basis for <m>\mathbb R^3</m> is <m>\{\vec e_1,\vec e
     <introduction>
         <p>
   Take the RREF of an appropriate matrix to determine
-  if each of the following sets is a basis for <m>\IR^4</m>.
+  if each of the following sets is a basis for <m>\IR^4</m>. When using Octave on these large matrices, try first typing "format rat" at the top before you 
+  enter the matrices. What do you notice about the formatting? Is this helpful?
+        <commentary component="instructor">
+            <title>Instructor Note</title>
+                <p> Using format rat aligns the columns nicely and actually converts decimals to fractions, when applicable.</p>
+        </commentary>
         </p>
     </introduction>
     <task>