Arbitrary complex inputs to the model

[DING219]

Hi, I'm so excited to use your updated package to fit the data. Thank you for your recent works.

I have ever used the pmcmc_parameters() function to insert the weather data into the model (you named "transform" function in "mcstate" package).

Is there a similar function in the "monty" package, or it could be realized through parameter setting?

[edknock]

Hi, what you'll want to use is a "packer" - this is the monty equivalent of mcstate's "transform" function.

https://mrc-ide.github.io/monty/reference/monty_packer.html

It sounds like you'll want to include your weather data within the fixed input when building your packer - the above page should be helpful, with explanations and examples on how to build and use your packer.

[DING219]

Thank you so much for your kindly reply.
When I try to insert the weather data, I found that I can't use an index to indicate the calculation of specified step on weather data (like the code " update(time) <- (step + 1) * dt " did in odin.dust package, I have ever used something like "weather_data[step+1]*beta" ).
Is there still have something like "step" to indicate the updated time varying data?

[edknock]

Systems are no longer run by increasing step by increments of 1 (any usage of step is forbidden now), instead they now increase time by increments of dt where dt is now a special parameter (see the migration docs here)
https://mrc-ide.github.io/odin2/articles/migrating.html#discrete-time-models-have-a-more-solid-time-basis

For what you are trying to do, we would now recommend making use of the interpolate function
https://mrc-ide.github.io/odin2/articles/functions.html?q=interpolate#interpolation
For examples of how to use this, see here in the odin-monty book
https://mrc-ide.github.io/odin-monty/interpolation.html#using-interpolation-functions