including functions from external files

[David]

I love the ability to create user-defined functions.

I don't think the manual mentions an ability to include functions from a separate file. It seems like that would be pretty helpful. Is it in the plans?

Thanks,

David

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David J. Chudzicki
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(518) 366-7303

[Bob Carpenter]

Yes, it's on our medium term to-do list, so we're hoping we
can do something in a six to nine month time frame.

The plan's to just apply the C++ pre-processor to the Stan
program itself, which will support includes as well as macros
and ifdef (not that we'll be encouraging people to use those).

It introduces a headache in error reporting because we have
to keep track of the file and line number that we're in.
The preprocessor supports that but we need to figure out how
integrate it.

- Bob

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[Bob Carpenter]

Oh, we also want to include a testing framework for
functions, which would make most sense for functions
defined in their own files.

The alternative plan would be to have some external
way to compile and link function includes that didn't
involve the preprocessor. But we definitely need to figure
this out. Among other things we want to supply a built-in
library of functions, and we'll need include to do that
efficiently and not drag down compile times.

- Bob

On Oct 24, 2014, at 2:56 PM, David <dch...@gmail.com> wrote:

[David]

That's great. Thanks!

[Gary Schultz]

Bob:

The C preprocessor would be really helpful for building real models. I'm finding I am repeating a lot of code, despite knowing that is bad form. 

I understand the earlier estimate was not a promise, but are you able to give an update on timing?

Thanks,

Gary

[Ben Goodrich]

On Tuesday, August 30, 2016 at 2:41:12 PM UTC-4, Gary Schultz wrote:

The C preprocessor would be really helpful for building real models. I'm finding I am repeating a lot of code, despite knowing that is bad form. 

I understand the earlier estimate was not a promise, but are you able to give an update on timing?

#includes are supported by the stanc_builder function in rstan. Doing it in the Stan language generally is perhaps 6 to 9 months away.

Ben

[Daniel Lee]

Hi Gary,

There's actually no reason you can't use the C preprocessor now to generate Stan files, if you were good at hooking together C tools. From RStan, there are includes (which isn't the general answer, but it works).

Daniel

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[Gary Schultz]

Thanks for the update and suggestion, Ben. I'm using cmd stan. 

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[Gary Schultz]

Yes, but it is a little messy, especially if you like to use line numbers to find errors that the compiler finds. 

I was really hoping that the "right' way of doing it would come out soon and save me from inventing another layer of indirection in my code. Sounds like it is a ways off yet.

Thanks for your response.

Gary

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