NEWS

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AdsorpR 0.1.1 (2026-09-02)

Bug fixes

• Fixed an error in the non-linear isotherm fitters (nonlinear_bet(), nonlinear_langmuir(), nonlinear_freundlich(), nonlinear_temkin()) where computing the model summary could fail on singular-gradient fits. summary.nls() calls chol2inv(), which errors on some BLAS/LAPACK and CPU configurations (notably BLIS and arm64 Linux) when the gradient is singular, causing the examples and vignette to halt. The summary is now computed defensively: if it cannot be formed, the function returns NULL for the model summary (with a warning) instead of stopping. This resolves the CRAN "Additional issues" failures on BLIS and linux-arm64.