Max and min function in Stan

[Kazem]

Dear all, 

How maximum and minimum functions work in rstan?
I am trying to fit a mixed model in rstan, which in the mean of the function I am going to use maximum of  two values. In rjags and bugs you can use "max", but in rstan? 

Here is my model:

Mu[i]<-b[id[i],1]+beta[1]+beta[2]*Age[i]+beta[3]*Season[i]+Drop*max(dif[i],0) ; 

                                                                                             ^-- here

DIAGNOSTIC(S) FROM PARSER:

no matches for function name="max"

Thanks,

Kazem Nasserinejad

[Ben Goodrich]

In Stan v1.3.0, I think you need to use the "floating-point" variants, fmax() and fmin().

Ben

[Bob Carpenter]

fmin and fmax if the inputs are continuous ("f" is
for floating point). The reason we follow the C++
convention is to make it clear what the result type is:

int max(int,int)
int min(int,int)

real fmax(real,real)
real fmin(real,real)

Because int gets promoted to real, you can use fmax
and fmin with real or int inputs, but the outputs
are always real.

- Bob

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[Kazem]

Thanks,

Kazem