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新手,在看netlogo自带的例子时,有几行程序看不懂,希望高手能够指点。
) y% @: @+ V6 p& c* a# }- Tnetlogo自带的social science--traffic grid这一例子当中,' i7 h' X( K4 B6 A
globals% j6 A! K4 A( }
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grid-x-inc ;; the amount of patches in between two roads in the x direction/ o" C6 P/ K* t% M6 g7 ~" q
grid-y-inc ;; the amount of patches in between two roads in the y direction. J9 W: y; a* c! B5 k0 P% W# t2 s
acceleration ;; the constant that controls how much a car speeds up or slows down by if
/ R/ Z7 ^+ {' Y2 Y5 ^ B. g) s ;; it is to accelerate or decelerate3 g5 h2 P* S# ?
phase ;; keeps track of the phase+ b6 d, t. {' P# Q5 A
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 s& G' K' I8 v! Y current-light ;; the currently selected light& y8 u6 P5 X) O, B7 `, A
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;; patch agentsets
/ l, k8 c7 c% ^0 [( p: p7 k' \ intersections ;; agentset containing the patches that are intersections
, Q$ O) P9 B4 D7 c" a0 | roads ;; agentset containing the patches that are roads
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turtles-own2 @7 u) m, ~* K4 I! Z& e% L A
[
9 @5 i- j4 l( x/ e6 {- n7 p4 B speed ;; the speed of the turtle3 {! I2 I1 S% T( u
up-car? ;; true if the turtle moves downwards and false if it moves to the right# O! t L0 t _9 ]% H0 `( @
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own; j2 P& N7 _' l! R# d. M G
[
' i7 z* B& a/ C8 s" c intersection? ;; true if the patch is at the intersection of two roads
) ^, q" z$ j3 s green-light-up? ;; true if the green light is above the intersection. otherwise, false.
6 D U3 l+ u0 O3 z/ N1 b ;; false for a non-intersection patches.5 f4 e9 |3 I" h+ Y1 w& d
my-row ;; the row of the intersection counting from the upper left corner of the
& [8 [$ T8 h4 J0 [! S5 Z" Y) N ;; world. -1 for non-intersection patches.
9 K& T; B6 F( J5 W) } my-column ;; the column of the intersection counting from the upper left corner of the, p4 n6 A: v7 X, R. p" K Q- S9 J- }) O
;; world. -1 for non-intersection patches.
% ?; O5 J. h. W3 c$ |: | my-phase ;; the phase for the intersection. -1 for non-intersection patches.6 E" Z) {: _* i" B
auto? ;; whether or not this intersection will switch automatically.
+ D7 C6 d, A% u5 j1 L, j ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;: a$ R0 }( ]: Y+ [0 }; C
;; Setup Procedures ;;
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x# K, X1 G4 m7 S' f;; Initialize the display by giving the global and patch variables initial values.
$ E9 ]: b/ M: Z;; Create num-cars of turtles if there are enough road patches for one turtle to
4 t1 m; M4 P# s! G2 A# p1 R;; be created per road patch. Set up the plots.
: m# Q/ q, R* A/ G9 w8 g9 Oto setup% [; F. i p* w% V" {* @! Y
ca
2 u/ [( n6 X; P. _" p4 m setup-globals* S1 u) p! B; L2 v" f' Z k
; Q4 g8 l9 C3 a' N9 e ;; First we ask the patches to draw themselves and set up a few variables
/ C0 _ F4 k$ q" x6 z& M' }: \ setup-patches
9 x+ M- l& `( e3 B3 L( r3 G6 \5 O make-current one-of intersections
) `* b9 u. t9 [# U6 \- Y% R label-current* ^- z& s0 B, N* O) D
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set-default-shape turtles "car"% {8 { y/ m$ r$ ], F8 N
6 K3 C5 B+ B: }0 u+ S( h if (num-cars > count roads)/ Z8 G& n- H- f- F9 T; n
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user-message (word "There are too many cars for the amount of "
' O3 d. ]4 u/ }" }8 o+ v# B "road. Either increase the amount of roads "5 I7 R: p7 Q$ j- s& q! Y# o$ o
"by increasing the GRID-SIZE-X or "
6 e5 ^/ D# I9 ^; U2 ` "GRID-SIZE-Y sliders, or decrease the "0 t5 z9 D' h) e. o
"number of cars by lowering the NUMBER slider.\n"+ Y$ C8 X2 F; i
"The setup has stopped.")% W4 p F- R7 D- Z' q
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 S# e0 {0 _& [" @& r% a crt num-cars
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9 t2 ?' @. ?, k& Z. ^ setup-cars
# ?6 C! X2 T/ B9 d8 o set-car-color
/ ^, @9 V7 `7 }% B9 i4 T- `/ R record-data! b' ]; H% h) y& z# _
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;; give the turtles an initial speed
4 L. l1 w% Q2 K( I- o ask turtles [ set-car-speed ]
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reset-ticks+ i% x3 @( T. \- ]' i ]: }
end
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;; Initialize the global variables to appropriate values8 a' I( m0 n( R3 Y0 p
to setup-globals* O# {/ F8 Y( Y/ l
set current-light nobody ;; just for now, since there are no lights yet! n; o; _4 a/ |
set phase 0
/ G! K2 u) T) \! W set num-cars-stopped 0/ a3 [! ^- y# l, x# f1 U
set grid-x-inc world-width / grid-size-x
; t% v5 w. A/ U! i set grid-y-inc world-height / grid-size-y6 O/ }9 {6 n. v5 N# R4 ] I, ^
, m+ _+ a4 R; s+ f0 u. A: ] ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ R6 B; x4 }' K3 U. y3 j
set acceleration 0.099
1 T( k# H! X1 `end
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1 G( C+ L; r. ?" U% Y$ D;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. O6 Z; l5 H; R. U5 x. Y* j;; and initialize the traffic lights to one setting
( |7 g' R% f3 E+ |4 qto setup-patches/ r, q- \4 y8 v; v
;; initialize the patch-owned variables and color the patches to a base-color
3 K8 t4 G+ T+ N$ M; `8 @. X ask patches
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" Z0 M. h* g, e set intersection? false
8 S7 G; g# ?) o1 F- e$ } set auto? false% [0 }4 ]3 G& D" B z
set green-light-up? true- D3 g! W4 e! U$ Q
set my-row -12 n0 u8 E2 ^ t: A w- B
set my-column -1
: X9 {' b/ d/ V; j$ @/ n set my-phase -1
- l, P& ~! n) H2 d8 S set pcolor brown + 3, Q7 b$ O5 b4 z3 B7 T N
]
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;; initialize the global variables that hold patch agentsets
( x+ q& j: j3 T f! n set roads patches with6 \+ c2 @5 C6 t6 B) Q3 j7 u, M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" `! ^9 `3 ~) ?& G" O/ j' ~# z) d5 | (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- r3 |8 \4 Z" U/ s; X r set intersections roads with$ p2 k1 ~8 ?- {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 `- L+ p6 P1 J6 V! e
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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* M5 V; {: l/ E% v7 r ask roads [ set pcolor white ]( Q9 ^/ C0 O4 F2 g
setup-intersections
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) k: K/ ?+ Q/ n! N; @其中定义道路的句子,如下所示,是什么意思啊?+ w' Q) z' |+ z
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ I2 x! r: L w$ _4 w谁能帮我解释一下[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0)是什么意思吗? |
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