Data partition in shiny using caret package

[pieterjanvc]

Hi,

Although I don't know if the data in the variable new$student is valid, one mistake I see in the code is that you assign a reactive variable index, but when you call it, you don't call it as a reactive variable. You should use the brackets when calling them like so:

new[index(),]

I know it looks a bit weird, but in Shiny, reactive values are functions that store the value.

It's better next time to create a reprex (or create one if this didn't help), so we can more easily test the issue ourselves:

Shiny debugging and reprex guide

Shiny issues can be challenging to resolve relative to other problems with your code or statistical methods. Shiny apps are often large, complex projects with interacting files. When seeking help from others it is considered polite to: First, do your best to work through RStudio's debugging tools to diagnose your issue on your own. Often those shiny logs and tracebacks are useful to others trying to help out. Second, strive to minimize the effort required to replicate your issue. You can do this with a reproducible example ("reprex"). Shiny Debugging Errors in Shiny code can be difficult to track down. If you don't know where your problem is coming from, you can track it down with some o…

Hope this helps,
PJ