HP PRIME  How to plot a phase Bode plot ?  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: HP PRIME  How to plot a phase Bode plot ? (/thread254654.html) 
HP PRIME  How to plot a phase Bode plot ?  dg1969  11022013 Hi, I want to create a program that is able to plot a curve without phase discontinuities on +/ pi rad... So The use of the ARG() command is not enough ... The classic tricks that I use with GNUPLOT can not be used here ... Here is a description of what I'd like to get:  first ask for transfer function F(s)(with input command) F(s)= (1+10*s)^2/(1+s)^3 for example...  use the subst cmd to replace 's' by 'i*ALOG(X)' where X is the pulsation in rad/s. So I can plot for Xmin <LOG(X)< Xmax
 create the F1 var function ready to plot in Function APP... phase(X)=ARG(F(i*ALOG(X))+2k*PI The difficulty is to calculate k ... On Gnuplot I look continuously during plotting process at ARG(f(xold))ARG(f(x)) and if a jump occurs I increment or decrement k according to the sign of the jump... Another idea is to use CAS command zero or solve and save all roots of arg(F(X))=+/Pi in list L1 then create F1(X)=F1(X)+2*PI*Heaviside(XL1(n))in a loop for n=1 to size(L1)... I'm looking for advice and assistance for such a program... Thank you in advance if someone just spend a little time on this little problem ;o)
