George Stagg

Welcome back! I guess asking you to solve the halting problem on your return is a little mean 😅 I was picturing something like a software watchdog timer but rewriting...

How about accepting an unsubmitted answer, but only if there isn't already a last-submitted answer in that gap?

In addition to unsubmitted answers, if students press submit but the answer is invalid the interface does not do a great job of showing that their answer was not accepted....

Also reported at https://github.com/r-wasm/webr/issues/341. I had another look at it this today. The main blocker is the Fortran library `arpack`. The Fortran compiler that we are using, a patched version...

>With the C core we bundle an older version of ARPACK that was translated to C with f2c [...] could it be used with webR? Perhaps, can you please send...

WebR reduces the default value for `options(expressions=)` to 400, because call stack space in browser worker threads is limited and it helps catch deep evaluation errors with R conditions. You...

> But I wonder if there is an appropriate way to avoid increasing the stack and maximise chance it will work across all browsers? There might not be much an...

This is difficult currently because the [`dls001`](https://github.com/cran/rootSolve/blob/20215d6c6c76d8ef552964ddf451eddc0f5ffb8f/src/lsodes.f#L1769) symbol used in `rootSolve` is defined as a Fortran `COMMON` block, and at the time of writing the LLVM WebAssembly backend [does not...

Similarly to #306, I believe this is a consequence of package loading -- the `plotly` package depends on more packages (70) than `ggplot2` (28). Nevertheless, this should be improved in...

Thanks for reporting this. It looks like the Wasm compiled `vroom` package gets stuck in a lock during `readr::read_csv()`. Until we track down the bug further, you will need to...