[This line](https://github.com/matteoscordino/iir-designer-cmsis-dsp/blob/b718be5b04904c1ee6abcd4cae3918095975fab5/design_iir_bandpass_cmsis_elliptical.m#L32) looks as though it's a copy-and-paste error.
This line looks as though it's a copy-and-paste error.