Sometimes it crashes on ios on certain data

[evekeen]

Could you help me fixing this issue?

Crashed: com.apple.main-thread 0 libSparse.dylib 0x1b98da1bc _SparseTrap + 3442 1 acetrace 0x102de4350 closure #1 in closure #1 in static Spline.computeDerivatives(from:boundaryCondition:) + 1093 (SolveImplementationTyped.h:1093) 2 acetrace 0x102de3ea0 closure #1 in static Spline.computeDerivatives(from:boundaryCondition:) + 4373708448 (:4373708448) 3 acetrace 0x102de07f8 SparseMatrix.use(calculate:) + 50 (SparseMatrix.swift:50) 4 acetrace 0x102de3c08 static Spline.computeDerivatives(from:boundaryCondition:) + 44 (Spline+Computation.swift:44) 5 acetrace 0x102de57a4 Spline.init(arguments:values:boundaryCondition:) + 55 (Spline.swift:55)

[evekeen]

@Bersaelor I'm desperate here... Maybe you could at least point me in a right direction, so I'd fix that myself?

[Bersaelor]

_SparseTrap is a tricky error, it's not like a normal swift error where some pointer is null.

(1) could you make a minimal Unit test of your problem? This way we can share the data and compare algorithm implementations. (2) Are you sure your initial conditions aren't degenerate, i.e. the determinante is 0? It could be the system is over or underdefined.

Sorry for not having much time for this atm, I'm already working on too many other things these days...

[evekeen]

Thank you for reaching back! The determinant might be 0, is there a way for me to run a check? Right now I’m checking if points are on a line, because I’ve figured that causes a crash as well. I’ll try to create a unit test. The problem is that it’s something I see in the crash reports from users of my app, and I haven’t reproduced it myself yet.

Thanks, Alexander.

On Aug 6, 2021 at 10:42:07 AM, Konrad Feiler @.***> wrote:

_SparseTrap is a tricky error, it's not like a normal swift error where some pointer is null.

(1) could you make a minimal Unit test of your problem? This way we can share the data and compare algorithm implementations. (2) Are you sure your initial conditions aren't degenerate, i.e. the determinante is 0? It could be the system is over or underdefined.

Sorry for not having much time for this atm, I'm already working on too many other things these days...

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