parsing expressions

-----maxima-bounces at math.utexas.edu wrote: -----

>Thus, we have the string
>  x^3*sin(x^4-1)^2-x^2+1.2;

>in the file "data_3".

>I?want?to?change?the?output?string?to
>
>??pwr(x,3)*pwr(sin(pwr(x,4)-1),2?-?pwr(x,2)?+?1.2;


 (%i5) to_pow(e) := subst("^" = lambda([a,b], pwr(a,b)),e)$
 (%i6) to_pow(x^3*sin(x^4-1)^2-x^2+1.2);
 (%o6) pwr(x,3)*pwr(sin(pwr(x,4)-1),2)-pwr(x,2)+1.2


--Barton