R formula language---a min and max function?

Dear R experts---I would like to estimate a non-linear least squares
expression that looks something like

  y ~ a+b*min(c,x)

where a, b, and c are the three parameters.  how do I define a min
function in the formula language of R?  advice appreciated.
?pmin
sincerely,

/iaw

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R formula language---a min and max function?

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