Replace dense matrix spline implementation with efficient sparse matrix approach#40

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krystophny wants to merge 56 commits intomainfrom

Commits on Jul 31, 2025

Fast default splines
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Fix natural boundary conditions
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Fix index of spline coefficient
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Add error handling for LAPACK call
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Remove trailing whitespaces
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Add spline module design analysis documentation

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Replace splinecof3_a with direct sparse matrix implementation

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Replace dense matrix implementation with direct sparse implementation

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Fix testing scope by removing enable_testing() from COMMON

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Update make test to run only spline comparison test

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WIP: Add runtime performance test infrastructure

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Revert complex module restructuring, keep sparse implementation

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Restore inter_interfaces.f90 to main branch state

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Add fast path detection to main spline_cof.f90 and update documentation

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Fix tests to properly validate correctness against original implementation

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Improve test validation to only compare when dispatch conditions are met

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Fix fast path bug by disabling incompatible optimization

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Commits on Aug 1, 2025

Commits on Aug 2, 2025