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LREtools

 REtodelta
 return the difference operator associated to the LRE

 Calling Sequence REtodelta(problem)

Parameters

 problem - problem

Description

 • This routine returns the difference operator, in terms of the inert name LREtools[Delta], associated to the problem.  The operator is indexed by the name of the variable from the problem.
 • The command with(LREtools,REtodelta) allows the use of the abbreviated form of this command.

Examples

 > $\mathrm{with}\left(\mathrm{LREtools}\right):$
 > $\mathrm{REtodelta}\left(u\left(n+1\right)-u\left(n\right),u\left(n\right),\left\{\right\}\right)$
 ${{{\mathrm{LREtools}}}_{{\mathrm{Δ}}}}_{{n}}$ (1)
 > $\mathrm{REtodelta}\left(\left(t+1\right)u\left(t+2\right)+\left(t+2\right)u\left(t\right),u\left(t\right),\left\{\right\}\right)$
 $\left({t}{+}{1}\right){}{{{\mathrm{LREtools}}}_{{\mathrm{Δ}}}}_{{t}}^{{2}}{+}\left({2}{}{t}{+}{2}\right){}{{{\mathrm{LREtools}}}_{{\mathrm{Δ}}}}_{{t}}{+}{2}{}{t}{+}{3}$ (2)

 See Also

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