simplify differences between 1.2 and 1.3

For some rational polynomial expressions, I’m seeing worse simplification results with version 1.3.1 than with 1.2. Additionally, the results take much longer to compute:

function run(e){console.time(e);try { return Algebrite.run(e)} finally{console.timeEnd(e)}}

with 1.2.0

simplify((x^2+8x-3)/(x^2-1)-(x^2+8x-3)/((x-1)*(x+1))): 334.2421875 ms
0

simplify((x^2+12x-5)/(x^2-2) - (5-12x-x^2)/(2-x^2)): 120.877197265625 ms
0

with 1.3.1

simplify((x^2+8x-3)/(x^2-1)-(x^2+8x-3)/((x-1)*(x+1))): 1446.41796875 ms
3*(1/(x^2-1)+1/(-x^2+1))

simplify((x^2+12x-5)/(x^2-2) - (5-12x-x^2)/(2-x^2)): 3286.921875 ms
x*(12/(x^2-2)+12/(-x^2+2)+x/(x^2-2)+x/(-x^2+2))

I’m also seeing many expressions that used to run quickly evaluating much slower. It seems possible this is from the rational simplification. Maybe that should be a separate function? Or have a way to turn it off for quicker results.

[28raining]

Hey Yaffle, awesome, your lib works! These equations are coming from a matrix inverse operation*

Would be super helpful if you can support variable name like R1 - I just created an issue on your git.

var matrix = ExpressionParser.parse(‘-1/(ab(-1/(ab)-1/(ac)-1/(bc)))-1/(ac(-1/(ab)-1/(ac)-1/(bc)))’);

*inverse matrix is part of MNA, which I’m building a web tool around https://lpsa.swarthmore.edu/Systems/Electrical/mna/MNA2.html

[Yaffle]

@28raining , you can try my lib , but it has its own issues. Are your use cases all “rational polynomial expressions” as well?