HP 49g+ - Manual (Page 152)

Page 14-7
Using the calculator in ALG mode, first we define functions f(t) and g(t):
Next, we move to the CASDIR sub-directory under HOME to change the value
of variable PERIOD, e.g.,
„ (hold) §`J @)CASDI `2 K @PERIOD `
Return to the sub-directory where you defined functions f and g, and calculate
the coefficients. Set CAS to Complex mode (see chapter 2) before trying the
exercises. Function COLLECT is available in the ALG menu (
‚Ч).