Quick question re: data in reactive function in shiny

[suveer.daswani]

Hello, is there a way through which I could VIEW the data created within a reactive function? Thank you!

[andresrcs]

I'm not sure if I understand your question correctly, but I think this shiny debugging guide could help you.

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…

[open-meta]

Assuming you're running Shiny on your own computer and not on a server, you can use the View() function (note that starts with a capital V) to open a variable in a spreadsheet-like tab inside RStudio. If the variable is a relatively short vector, it's also easy to just print() it, in which case the result will show up in your console.

Just add the commands to your reactive code. With print() you'll also find out how often that code is running, which may surprise you.

You want to remove these before you upload the file to your server, however, View() will crash the server and print() shows up in the server's log (which can be useful sometimes).

Tom