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.PS
# sfg.m4
sfg_init( 1.2 ) # scale default size by 1.2
iflatex(`textoffset = 1bp__; ifpsfrag(`textht = 9.5bp__',
`latexcommand({\small)') ')
[
# Graph 1
T:[
Ft: sfgnode(,f(t),sfgbelow)
sfgline(,1/K)
Y1: sfgnode(,y_1,sfgbelow rjust)
sfgline(,K/M)
DDY2: sfgnode(,\ddot{y}_2,sfgbelow rjust)
sfgline(,s^{-1})
DY2: sfgnode(,`\dot{y}_2=x_2',sfgbelow ljust)
sfgline(,s^{-1})
Y2: sfgnode(,y_2=x_1,sfgbelow ljust)
sf = 1
sfgarc(from DY2 to DDY2,-B/M,below,,sf)
sfgarc(from Y2 to DDY2,-K/M,above,ccw,sf)
sfgarc(from Y2 to Y1,1,sfgabove,,sf)
]
# Graph 2
B: [
R1: sfgnode(,r_1,sfgabove)
sfgline(,1)
X1: sfgnode(,\;x_1,ljust)
R2: sfgnode(at R1+(0,-1),r_2,sfgabove)
sfgline(,1)
X2: sfgnode(,\;x_2,ljust)
sfgarc(from X1 to X2,a_{21}\;,rjust,ccw)
sfgarc(from X2 to X1,\;a_{12},ljust,ccw)
sfgself(at X1,,q_{11})
sfgself(at X1,R,\;a_{11},ljust,cw,1.5)
sfgself(at X2,-90,a_{22},sfgbelow)
] with .w at T.e + (linewid/2,-linewid/4)
# Graph 3
G3: [#sfg_init( 0.85,0.35/2 ) # change node spacing and increase node size
sfg_wid = 0.85
sfg_rad = 0.35/2
for_(1,4,1,`N`'m4x: sfgnode(,m4x,,fill_(0.9))
sfgself(at N`'m4x,-90,P_{m4x},,cw)
ifelse(m4x,4,,`sfgline(,G_{m4x},sfgbelow)') ')
sfgarc(from N2 to N1,F_2,sfgabove,ccw,)
sfgarc(from N3 to N1,F_3,sfgbelow,ccw,1.4)
] with .nw at T.sw
A: [#sfg_init( 0.75,0.15 )
sfg_wid = 0.75
sfg_rad = 0.15
arrow right linewid*2/3
P: sfgnode(,p)
sfgself(,90,a,sfgbelow,cw)
arrow from P.e "b" below
Q: sfgnode(,q)
R: sfgnode(at Q+(Q.x-P.x,Q.y-P.y),r) # for gpic
sfgarc(from Q to R,c,sfgabove,cw)
sfgarc(from R to Q,d,sfgbelow,cw)
sfgself(at R,-90,e,sfgabove,cw)
arrow right linewid*2/3 from R.e
] with .w at G3.e+(linewid/2,0)
G4: [sfg_init( 2.0,0.25/2 ) # change node spacing and increase node size
s1 = 0.9
s2 = 1.2
N0: sfgnode(,\hbox{\Large 0},,invis)
sfgline(right_ sfg_wid,\nu,below,->)
N1: sfgnode(,\hbox{\Large 1},,invis)
{ sfgarc(to N0 ->,(1{-}p)\gamma{+}\nu,above,ccw,s1) }
sfgline(right_ sfg_wid,\nu+\lambda,below,->)
N2: sfgnode(,\hbox{\Large 2},,invis)
{ sfgarc(to N1 ->,{{2}\choose{1}}p(1{-}p)\gamma{+}2\nu,above,ccw,s1) }
{ sfgarc(to N0 ->,(1{-}p)^2\gamma,above,ccw,s2) }
sfgline(right_ sfg_wid,\nu+2\lambda,below,->)
N3: sfgnode(,\hbox{\Large 3},,invis)
{ sfgarc(to N2 ->,{{3}\choose{2}}p^2(1{-}p)\gamma{+}3\nu,above,ccw,s1) }
{ sfgarc(to N1 ->,{{3}\choose{1}}p(1{-}p)^2\gamma,above,ccw,1.2) }
{ sfgarc(to N0 ->,(1{-}p)^3\gamma,above,ccw,s2) }
sfgline(right_ sfg_wid/2,\nu+3\lambda,below,->)
{"$\ldots$" wid 0.3 ljust}
] with .nw at G3.sw+(0,-0.15)
move from (T.w,G4.s)-(7bp__,6bp__) to B.ne+(15bp__,6bp__)
]
#showbox_
iflatex(ifpsfrag(,`latexcommand(})'))
.PE
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