Untracked: Throw User error if user supplies non-positive cost parameter

[jrwishart]

The Standard R code currently has a text box control. This should be updated to use a numeric up down but will still throw non user errors for those versions.

[chschan]

Sometimes, if when we don't know what the increment should be, we use a text box to input numeric values instead. Is this one of those cases, or is the range for cost quite restricted?

[jrwishart]

Sometimes, if when we don't know what the increment should be, we use a text box to input numeric values instead. Is this one of those cases, or is the range for cost quite restricted?

Yeah, could update the parameter to increment in 0.01 but probably easier to leave it as is in 'numeric' text mode. I'm assuming the numeric text mode is resilient to bad inputs otherwise?