[R] optmizing with monotone stepfunctions?

["Dr. Jens Oehlschlägel"]

Before re-inventing the wheel I would like to ask: does anyone know about 
an optimizer in R which can reliably identify which value of X (Xopt) leads 
to Y (Yopt) closest to Ytarget in

Y <- MonotoneStepFun(X)

optionally with the restriction that Yopt <= Ytarget
(at least if any Y <= Ytarget, otherwise any Yopt > Ytarget would be the 
preferred answer)

If none is known, I will write one.

Thank you

--
Dr. Jens Oehlschlägel
Analyse
BBDO InterOne GmbH
Königsallee 92
40212 Düsseldorf

Tel.: 0211 1379-8187
Fax.: 0211 1379-8787

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