clear
window 0
defaults
!
x=[0:720:5]
y=5+sind(x+20)*exp(x/800)+ran(x)
set
 plotsymbol -1
 nsxinc 5
 nsyinc 5
 curvecolor red
 
graph x y
scalar\fit a b c
c=100
fit\e1\e2 y=a+sind(x+b)*exp(x/c)
display 'root mean square standard errors of estimate for each paramter'
display '--------------------------------------------------------------'
display 'for A: '//rchar(fit$e2[1])
display 'for B: '//rchar(fit$e2[2])
display 'for C: '//rchar(fit$e2[3])
display ' '
fit\update yf
set
 plotsymbol 0
 curvecolor blue
 
graph\overlay x yf
set
 %xtextlocation 18
 %ytextlocation 91
 %textheight 3
 textalign 1
 textinteractive 0
 
text 'Fitted function y=a*sin(x+b)*exp(x/c)'
set
 %xtextlocation 70
 %ytextlocation 85
 %textheight 2

text 'a = '//rchar(a)
set %ytextlocation 80
text 'b = '//rchar(b)
set %ytextlocation 75
text 'c = '//rchar(c)
!set
! %xtextlocation 55
! %ytextlocation 94
! %textheight 6
! textalign 2
! textcolor red
! 
!text '<b>Extrema<b> fitting demonstration'