Numerical matrix comparison with a specified precision gives the wrong result

[lambrtz]

The code below checks if the matrices matrix and identity are equal within a specified tolerance. They are supposed to be equal, but the comparison returns false.

Here is an MWE:

using AngouriMath; using AngouriMath.Extensions; using static AngouriMath.MathS; using static AngouriMath.Entity; using System; using static System.Console;
using PeterO.Numbers;

Entity.Matrix matrix = "[[1.000000000000000547458310833800074927650525249394612805610000, 0, 0, -9.55753574799863785565952768061466479249665075036612773690000E-15], [0, 1.000000000000000547458310833800074927650525249394612805610000, 0, 2.24075209004037969624007863746621061783995000E-15], [0, 0, 1, 0], [0, 0, 0, 1]]";
var identity = MathS.IdentityMatrix(4);
using var _ = MathS.Settings.PrecisionErrorCommon.Set(0.1m);
WriteLine(matrix == identity);

Output:

False

[WhiteBlackGoose]

@lambrtz Thanks for reporting! The issue has been fixed. Use .EqualsImprecisely now to compare entities, and let me know if you run into issues.

The fix will be available since the next release. If you want it ASAP, you can get the current master build as described here

[WhiteBlackGoose]

Wait. I made a mistake. The issue is more complicated, actually

[WhiteBlackGoose]

@lambrtz alright, this time it's probably done 😅 . So now you can use .EqualsImprecisely to imprecisely compare nodes (up to an error, which you specify as a parameter)