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D.11.4.9 xchange
Procedure from libraryfindifs.lib (see findifs_lib).
- Usage:
- xchange(w,a,b); w,a,b strings
- Return:
- string
- Purpose:
- exchanges substring 'a' with a substring 'b' in the string w
- Note:
LIB "findifs.lib";
" EXAMPLE:";
==> EXAMPLE:
ring r = (0,dt,dh,A),Tt,dp;
poly p = (Tt*dt+dh+1)^2+2*A;
string s = texpoly("",p);
s;
==> $dt^{2}\cdot Tt^{2}+(2dtdh+2dt)\cdot Tt+(dh^{2}+2dh+2A+1)$
string t = xchange(s,"dh","dt");
t;
==> $dh^{2}\cdot Tt^{2}+(2dhdt+2dh)\cdot Tt+(dt^{2}+2dt+2A+1)$
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