Re: HP48g function Message #3 Posted by Karl Schneider on 20 Feb 2006, 2:36 p.m., in response to message #1 by Mark Davies
Mark 
You're in luck! In collecge 15 years ago, I not only solved AC and DC loop circuits using matrix functions on my HP15C, but also now have a 48G at which I am reasonably competent.
After setting up the exactlydetermined systemcoefficient matrix and the systemmeasurement vector (both realvalued for DC systems; both complexvalued for AC systems):
 Choose "SOLVE" (above "7" key) with the green rightshift key
 Select "Solve lin systems"
 Enter the (square) matrix as A. Use brackets to enclose each row vector, with spaces between each coefficient; enclose all vectors within another set of brackets to make it a matrix. Enclose complexvalued numbers inside parentheses, with a comma between parts. Use the angle symbol if needed (green rightshift, "SPC"). Load the values with "ENTER".
 Enter the measurementvector values as B, inside one set of brackets. (The same guidance applies for complexvalued numbers.) Load the values with "ENTER".
 Press the "SOLVE" softmenu key ("F").
 The answers will be in X. Use "EDIT" (softmenu key "A") to see the full values.
I used this procedure successfully to solve two examples in the HP15C manual.
BTW, this question could also have been posed in the Usenet group comp.sys.hp48, but it's not inappropriate here.
Regards,
 KS
