Question: change variable name

<p>Once I have defined a complicated expression, and then I realize that the variable x should have initially been named r , can I change x into r in such a way that when i view the expression, it is expressed in terms of r rather than x ?? Without going back and changing EVERY x into an r ??  If i do r=x or x=r and then view the expression it still displays everything in terms of x rather than r.</p>
<p>Also, maple's fortran code generator renames my variables s~ ,t~ and g~ into c1,c2 and c3,  </p>
<p>can I customize what it renames them as ??</p>
Please Wait...