R help - Jan 2011 - selection of hinge function with restrictions, machine learning, earth package,

Hi,

I have a few questions regarding machine learning packages in R, e.g.
earth package
and its forward pass and prunning pass, and hinge functions selection in the
example below.

1) How could I force the algorithm to generate knots in hinge function only
with values < 90 for e.g. variable doy?
2) Is it possible to restrict the algorithm to generate maximum number of
terms per a selected variable e.g. humidity? e.g. 1 term instead of 2?

Thanks a lot.
rasti
>library(faraway)
>data(ozone)
>a=earth(O3~.,data=ozone)
>summary(a)
Call: earth(formula=O3~., data=ozone)

               coefficients
(Intercept)       8.6910756
h(vh-5740)        0.0152607
h(5740-vh)       -0.0130076
h(9-wind)         0.3044601
h(humidity-41)    0.2753048
h(humidity-54)   -0.2615068
h(temp-58)        0.3801961
h(ibh-1069)      -0.0006189
h(1069-ibh)      -0.0029057
h(dpg-11)        -0.1060948
h(80-vis)         0.0459011
h(doy-89)         0.0471836
h(89-doy)        -0.1264530
h(doy-159)       -0.0915781

Selected 14 of 19 terms, and 8 of 9 predictors
Importance: temp, ibh, doy, dpg, humidity, vh, vis, wind, ibt-unused
Number of terms at each degree of interaction: 1 13 (additive model)
GCV 14.85938    RSS 4134.014    GRSq 0.769177    RSq 0.8042181

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