[SOLVED] Issue with cZeros - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: [SOLVED] Issue with cZeros (/thread-7721.html) [SOLVED] Issue with cZeros - tiamattia - 02-05-2017 11:06 AM Hello, I'm developing a program to design filters using Butterworth and Chebyshev type I. To do this i defined some cas function to solve equations or denormalize things. Some of these functions are: Code: ``` BP_Denorm_TF(n_filter_gain, n_filter_poles, w_central, filter_q_factor) := BEGIN  cFactor(normal(n_filter_gain/ poly2symb(pcoeff(n_filter_poles), filter_q_factor * (x ^ 2 + w_central ^ 2) / (w_central * x)))); // BP transfer function END; BP_Denorm_Zeros(n_filter_gain, n_filter_poles, w_central, filter_q_factor) := BEGIN  cZeros(BP_Denorm_TF(n_filter_gain, n_filter_poles, w_central, filter_q_factor)); END;``` Use this as argument (1.002377293,{−0.707946782251-0.707946782251*i,−0.707946782251+0.707946782251*i},30781195.9239,2.44948974278) BP_Denorm_TF works right also inside of a program. Instead, BP_Denorm_Zeros is not working as it should inside of a program. If i call this function directly from cas, everything works, the result is two zeros in the origin. If i call this function inside of a program, no solutions are returned. What's the problem? RE: Issue with cZeros - tiamattia - 02-05-2017 11:31 AM Problem solved, when using CAS commands in program mode, you have to provide the variable to solve. I think it's because in program mode the default var is X while in CAS is x. (I'm usign x)