Okay so, it should be possible to use Cases and have a set of “lhs:>rhs” pattern matches, but it is not clear how to do this? I see a number of QAs using Alternatives and Except, but it doesn’t seem that would work for multiple delayed rules. Ideally you can match one case, apply a rule, then apply a rule to the remaining cases, or have an additional match, and so-on...

Is this an established use/is there a QA which might be useful for this? Or should I ask a new question regarding this?

@CATrevillian ? I have no idea what you mean by this

Doing Cases[bigExpr, {patA_ :> transfA_, ...}, levelSpec] should work

What about that doesn't do what you need?

Ah wait no that's StringCases

I see the difficulty

Here you want to do this:

pats = {patA_ :> transfA_, ...}
transf = Dispatch[pats]
Cases[bigExpr, a:(Alternatives@@Keys[pats]):>Replace[a, transf], ...]

The key is to precompile the rules with Dispatch

@kirma you do wonder about the kind of kids who'd know about Dirac's equation...

@J.M.'stechnicaldifficulties :)

He does admit going overly technical at that point though... ;)

Anyone here commonly use Mathematica on Linux? Does it work as well as you would expect, especially compared with MacOS or Windows?

$rules = {n_?PrimeQ :> prime[n], n_?PerfectNumberQ :> perfect[n], _ -> $Failed};

Range[10] // Cases[i_ :> With[{r = i /. $rules}, r /; r =!= $Failed]]

(* {prime[2],prime[3],prime[5],perfect[6],prime[7]} *)

@CarlLange I do. It got better over the years.12.1 is cool.

@RolfMertig Would you say it's a first-class citizen like the MacOS version is? I suppose I'm slightly worried because I only see SW use the MacOS version and as we all know, SW is the critical path :)

@CarlLange in terms of the FE, I think it's less cared for than the MacOS (at least per the bugs reported here)

@CarlLange have you considered grabbing a trial and giving it a go?

What's the simplest way to create a ListLogPlot of a sequence containing negative numbers? Negative numbers should be displayed as logs of their absolute values, but in a different color than positive.

@VladimirReshetnikov call Show on two separate plots

Now I do ListLogPlot[Style[Abs[#], If[# < 0, Red, Blue]] & /@ seq]

Is there a simpler way?