Andrew Johnson

Floating point precision loss under arm64 (FP_CONTRACT)

2

## Description The `inv_Phi` `prim` tests fail under arm64 (both gcc and clang): ``` root@19459e2892a7:/math# uname -a Linux 19459e2892a7 5.15.49-linuxkit-pr #1 SMP PREEMPT Thu May 25 07:27:39 UTC 2023 aarch64...

## Description We currently use a separate declaration to handle calls to the distribution functions without the `propto` parameter: ```cpp template inline return_type_t normal_lpdf(const T_y& y, const T_loc& mu, const...

ODE Methods not `fvar<T>` compatible

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## Description The ODE functors aren't compatible with `fvar` inputs and fail to compile #### Current Version: v4.4.0

Use finite-differences where forward-mode not implementable

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## Description As discussed over in #2839, the ODE methods are not `fvar` compatible, and it would be a significant amount of work to do so. This means that any...

Add a signed log_sum_exp

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## Description When using `log_sum_exp`, it would be useful to be able specify a 'sign' for the variables being aggregated - such that some inputs are added and some subtracted....

#### Summary: R and RTools will soon be [providing versions for ARM64 Windows](https://blog.r-project.org/2023/08/23/will-r-work-on-64-bit-arm-windows/), with experimental nightly builds [already available](https://www.r-project.org/nosvn/winutf8/ucrt3/). We should investigate any patches needed for building under ARM64 windows...

Update deprecated syntax for future rstan compatibility

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Now that rstan 2.26 is available on CRAN we need to update the deprecated syntax in your package's Stan models, otherwise it will fail to install with an upcoming version...

Use cmdstan for parallel chains

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As recently flagged in #888, it can be confusing that we use different approaches for parallel chains (multiple `processx` calls) than for parallel pathfinders (cmdstan TBB). Now that all MCMC...

Add option for linking and executing models through R/Rcpp to avoid admin issues with executables

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As discussed in #815 and many other issues and forum posts, users in organisations aren't able to use `cmdstanr` (or at least not without some difficulty) due to organisational restrictions...

Compile model methods once and reuse for all models

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#### Submission Checklist - [x] Run unit tests - [x] Declare copyright holder and agree to license (see below) #### Summary This PR adds the ability for the model methods...