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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。* g) o m$ J# u5 b1 x4 H* ?( ?
netlogo自带的social science--traffic grid这一例子当中,) h7 ~: [5 o& r6 H
globals
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4 Q; _0 Z j/ y! T9 G7 ^+ f grid-x-inc ;; the amount of patches in between two roads in the x direction- j1 {/ y. d. O( y; Y: M2 [
grid-y-inc ;; the amount of patches in between two roads in the y direction
7 s- w$ y) R( R acceleration ;; the constant that controls how much a car speeds up or slows down by if/ A2 X" e1 P+ Q# t+ e/ |
;; it is to accelerate or decelerate! R2 M: u8 G9 S8 C0 f0 M$ V5 K$ |
phase ;; keeps track of the phase( k M% r( \6 Q
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure. ]8 ~) @+ Z( v" \+ _
current-light ;; the currently selected light
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;; patch agentsets
$ n, f, R6 x8 b% }/ o) z- F intersections ;; agentset containing the patches that are intersections
9 m x0 y0 Z- V: q roads ;; agentset containing the patches that are roads6 m' C+ p6 b, N8 ~4 `& m
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turtles-own
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" X8 {7 o& m. g9 ]$ ?# r, u speed ;; the speed of the turtle
2 z/ k- `, Z- I- E7 M' P9 L up-car? ;; true if the turtle moves downwards and false if it moves to the right
* I- W" M/ @" F8 I; t: A7 c wait-time ;; the amount of time since the last time a turtle has moved9 N( i+ S/ I' R: T& Z2 E
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patches-own6 h% a8 @4 K' L8 T; J
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intersection? ;; true if the patch is at the intersection of two roads
, t1 f( A4 l. W# x Y green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 s& _/ {7 E2 }5 h+ F ;; false for a non-intersection patches.; O5 I2 X+ Y$ Z( ~
my-row ;; the row of the intersection counting from the upper left corner of the! d/ b5 R9 m7 o3 j: H# e$ ~3 I: ?
;; world. -1 for non-intersection patches.
9 ?% J& m+ q$ c) v; Q my-column ;; the column of the intersection counting from the upper left corner of the
2 c; z. C- R, o) e ;; world. -1 for non-intersection patches.
/ X! O: m5 d$ {1 y4 ^ my-phase ;; the phase for the intersection. -1 for non-intersection patches.* n& @9 W( C2 e! a+ h, F
auto? ;; whether or not this intersection will switch automatically.& h% G' u& E! I* g
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
( I) }3 k1 W8 l" z& g* k;; Setup Procedures ;;% f5 f, R& H% ]1 V
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;; Initialize the display by giving the global and patch variables initial values.
1 q! K( \8 _6 S; [# C+ p& ] f;; Create num-cars of turtles if there are enough road patches for one turtle to
: R s6 J6 A, ^2 e% F' f/ Z# |1 c;; be created per road patch. Set up the plots.% w$ ^1 h' s8 v0 @) o9 A' b% E
to setup m+ ~6 u0 [: W7 a( i
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables8 E+ s/ j7 x; O0 V5 y5 `
setup-patches
' F. _, @+ I1 g$ L make-current one-of intersections! ~# l2 Y! Q8 }. ]8 Y/ F9 Y7 D: |
label-current/ n4 r: t( h [$ B
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set-default-shape turtles "car"
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0 a, K* S/ G- w- J' j if (num-cars > count roads)4 j7 V r; O; N8 {& M8 f, Y1 q
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. ~5 y6 W3 G1 C4 m, @+ z2 e% d user-message (word "There are too many cars for the amount of "
- Q6 c. B$ z3 N2 v "road. Either increase the amount of roads "
2 {' C* j7 s+ S "by increasing the GRID-SIZE-X or "! ~; n1 D; D/ o% i* r
"GRID-SIZE-Y sliders, or decrease the "
' C& ^1 g' n) B) Q "number of cars by lowering the NUMBER slider.\n"
- f: C% n j, f9 D/ z% |, W5 b "The setup has stopped.")# I; f( e+ f1 [7 O) r
stop! B& w3 l9 x0 K! x$ j
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color N5 k2 q) z; S) `
crt num-cars, q, Y4 O9 M6 Y- S, S1 @
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4 B. i! L7 V2 @0 R setup-cars- j; `/ g# R( G; C0 }4 [# w/ M
set-car-color3 r0 N7 i( X& L" e5 U0 ?, o
record-data" ?) R3 m. w- i* {- U/ ~2 H
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4 ~3 [0 g) q( X, T7 c" W1 o& u: | ;; give the turtles an initial speed" ]2 f2 Y, ]# m2 ~" W- U
ask turtles [ set-car-speed ]
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8 }" O$ v: ?( a+ O9 ~ reset-ticks
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# y: H! j2 v9 Q;; Initialize the global variables to appropriate values' { y& {3 X9 N. ?# L) F
to setup-globals
3 E; A, l) n! Y1 Z1 d set current-light nobody ;; just for now, since there are no lights yet
& Y' G5 G6 L: X9 y6 |) ]3 ~ set phase 0/ y, A V# d* v% _+ O7 \ A
set num-cars-stopped 0
* |- m& L4 B4 J set grid-x-inc world-width / grid-size-x
( L! B1 \4 Z; M Y5 K% |3 ~0 ] set grid-y-inc world-height / grid-size-y
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# v/ T3 E7 g }0 h/ x% W$ D: _( E ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 \( F9 O/ a5 C% @ set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ u/ H6 I9 L* R1 A5 t& C, t;; and initialize the traffic lights to one setting) Z0 j4 C1 h8 `) |8 L
to setup-patches% x) h5 G9 \& e4 U
;; initialize the patch-owned variables and color the patches to a base-color2 g0 y5 A. b/ U: z- f* N
ask patches9 H* K+ ^# T' z
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set intersection? false
! ^, Z' [4 a8 T8 u set auto? false
# M+ n& d0 x) E2 N4 ~ set green-light-up? true
* R& J0 b; \/ J4 `) C: k, D set my-row -1
8 [2 v h/ ?4 Z @" q# I$ e! c set my-column -11 C1 l) q. y- z1 k V
set my-phase -1+ y8 i! L& A2 _0 n% n
set pcolor brown + 3
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. O2 r1 ?% C, K+ M ;; initialize the global variables that hold patch agentsets0 z/ p3 N! q ~! a0 R u
set roads patches with2 g6 {& Z5 F! ^5 R! i$ N8 ?3 C: Z; ~* Z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- }. j9 K1 \; {5 K; o: o$ [7 u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 Z' `" B. Y H1 A6 G
set intersections roads with7 V) }0 Z7 M) S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 v) R4 v8 f% w+ q3 C$ G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]' M0 q1 M, z2 n2 h8 z; z: l- g
setup-intersections/ p" E. y: u& a, V, _1 o
end
7 m" f: Y# y9 Y1 y" J7 W其中定义道路的句子,如下所示,是什么意思啊?
4 ]; N' W; j \' o' t% q9 O, `- {# m8 h set roads patches with; w; [! H8 [/ X( ^6 C6 q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ j7 o0 V) }3 P p; {$ T, G, w (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 p( x# w0 c; k5 c) q5 k d' y( I% X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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