Gavin Simpson

@dill Thanks all the comments and suggestions and importantly taking the time to talk through some of the prior / null space things we both touch on in the comments...

This is because you are being too specific about the smooths that you want to difference. The function only works for factor `by` smooths (at the moment), so there is...

As for `qgam()` models; while I haven't tried it, I don't recall anything specific that would stop `difference_smooths()` from working unless the model you fitted was for multiple $\tau$ values...

Right now, no; I haven't implemented simultaneous intervals for differences, but I could do this.

I decided to just implement the code needed to allow specific comparisons of the sort you specified. Your example now works with the current version of *gratia* that is on...

This is a bit of an infelicity with *vdiffr*; despite using SVG for the comparisons (so it's all just plain text comparisons), a myriad of system differences can cause minor...