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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。$ W# j% f+ z( s
netlogo自带的social science--traffic grid这一例子当中," F! U" a* U8 b) A* \
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
# k5 F; Q- S& ^: k grid-y-inc ;; the amount of patches in between two roads in the y direction. \6 I; V6 u! {" d8 v
acceleration ;; the constant that controls how much a car speeds up or slows down by if6 E. U# t- L5 a1 o
;; it is to accelerate or decelerate
% b' o4 \* p" o' M9 t phase ;; keeps track of the phase3 C: a ^; e& F/ Y h# D7 A+ T
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
+ o8 g- S& x S0 k4 O! R {' m current-light ;; the currently selected light8 h; z' u- X. i# i; P" f7 r
( q: Z( p1 K; P: U5 @+ C* D% Z ;; patch agentsets
# @- c* x4 x$ R4 `' X1 p! x& X intersections ;; agentset containing the patches that are intersections5 y- x6 Y r( X5 k2 |, v( i
roads ;; agentset containing the patches that are roads6 r8 I8 d5 U A2 X$ o6 b
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turtles-own- |$ \' r, g* j( F0 L7 B1 _
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speed ;; the speed of the turtle# U0 m. y, ~1 x
up-car? ;; true if the turtle moves downwards and false if it moves to the right. W- C2 M; O$ L0 p/ x+ R2 ? W2 d
wait-time ;; the amount of time since the last time a turtle has moved
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6 f; f% X. K* p5 npatches-own% H# Y9 S8 v$ d8 B. f
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" z/ j+ K1 _+ u intersection? ;; true if the patch is at the intersection of two roads
$ E% V. U/ E, o# t2 ^- l green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% @$ R2 I! W0 K. w* L ;; false for a non-intersection patches." J8 I3 t* h/ r( Z
my-row ;; the row of the intersection counting from the upper left corner of the. I7 |$ f! j [ h
;; world. -1 for non-intersection patches.7 @1 C) s2 ?% u* I0 j* I2 `
my-column ;; the column of the intersection counting from the upper left corner of the
% z0 ?! g7 G, v ;; world. -1 for non-intersection patches.; U; f/ j- Y' V8 c+ F9 ]/ c
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
6 H$ y, R3 R' {: o4 v; s" w auto? ;; whether or not this intersection will switch automatically.
0 J# o- z1 N* E. F8 K. m7 |, }! J9 h, X ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;* o' A3 g, T7 A6 d* G4 L0 l: E
;; Setup Procedures ;;7 N+ J$ a& x* r/ R6 F
;;;;;;;;;;;;;;;;;;;;;;
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+ `, Z+ G' y. n% f# s5 i+ o;; Initialize the display by giving the global and patch variables initial values.
# B8 D7 J4 p& d4 u/ [, ~6 };; Create num-cars of turtles if there are enough road patches for one turtle to" B ^6 b8 A7 r0 \
;; be created per road patch. Set up the plots.
7 R) X- Q) N: q! b2 o3 d4 tto setup
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$ N ^- H% ~- r0 c. A setup-globals/ W- \- r2 X$ C4 E: Q) a
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;; First we ask the patches to draw themselves and set up a few variables9 P; Z& ?$ w4 z; T
setup-patches
- w7 B1 ^4 e6 `" ^8 p make-current one-of intersections
5 x' S( E, z5 t) f! n6 f/ H label-current) e# z6 e! j) h o- o' L
; @: x7 I/ N: \! `# Y set-default-shape turtles "car"7 u; g9 l8 {% u
' K" C, c3 d4 `& v/ w# f if (num-cars > count roads)
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- o# ?' h) e/ ^/ f user-message (word "There are too many cars for the amount of "
% |1 K) _7 Z' \7 e% k' N, R5 w "road. Either increase the amount of roads "
- X9 z3 N* X9 d7 ]% b3 s, _$ t "by increasing the GRID-SIZE-X or "8 o C: W2 d$ {5 k h! l( K
"GRID-SIZE-Y sliders, or decrease the "5 n" L$ @$ p% {4 v, b5 z
"number of cars by lowering the NUMBER slider.\n"% q( @* l& P3 b+ R
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
$ O9 v0 `4 u# ]- H$ H* Q crt num-cars$ u) u! o, {+ y
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! s7 j0 [% k3 U" K setup-cars
& X$ o7 E3 Q" A& k set-car-color
* v/ p- K }( k9 O+ r record-data
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;; give the turtles an initial speed
- K$ l- _3 N2 [( Q/ \ ask turtles [ set-car-speed ]- g8 X% D$ Y" m- ~" b7 x
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reset-ticks
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1 m& o( d; p+ ];; Initialize the global variables to appropriate values) s9 E0 A/ i0 h. s" c
to setup-globals
1 m6 `, h v$ L$ f0 x. w4 l set current-light nobody ;; just for now, since there are no lights yet: L* x" ^& Q- `/ K
set phase 0
j, D" I- v5 u- ^! T! ~- G- R8 f set num-cars-stopped 0- y( Y2 A* J# Z$ L
set grid-x-inc world-width / grid-size-x1 n: n3 Q: h$ W) z+ G5 w8 |2 X$ i
set grid-y-inc world-height / grid-size-y1 g: b( s" b5 X6 R
, g. w) E3 N+ F( ~ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' F0 z J9 t& e$ F2 ]
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& J8 \- i0 N" T3 Y! E. W! a8 G- G0 T;; and initialize the traffic lights to one setting
% h* T/ J- X* r& S% Yto setup-patches! Z; n% v% ^1 U# k4 ~# ]
;; initialize the patch-owned variables and color the patches to a base-color: _/ L* z6 J) s7 M" Y# W
ask patches7 ?" p& U# K4 b2 P
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set intersection? false
/ }. U6 n( P1 n+ [3 {$ F set auto? false
, V( V' ^7 R. A# L set green-light-up? true
q ]; ?6 v9 E" J% C set my-row -1% M r1 [1 T8 Z; z% C/ _/ i
set my-column -1
* f8 x1 j2 V4 L$ g set my-phase -11 @4 f6 Q+ Y' z8 s! V
set pcolor brown + 3: e0 F" o* h% i v) j' p
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: E; ]: o1 X. x* O, D. \ ;; initialize the global variables that hold patch agentsets9 K9 y$ Z. W( b9 W
set roads patches with( h0 ]' L8 O+ t! u7 f( ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; N& v* A8 R) {9 t1 R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) b+ o6 L: T: |- s
set intersections roads with
9 u! p! ^1 n( _' \6 @' @$ o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; l, ~. m$ B5 J) Z* s! u; E5 Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 r4 ^+ Y* q0 {: L N
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ask roads [ set pcolor white ]
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end
0 z7 g8 ~: [0 Q/ d$ d其中定义道路的句子,如下所示,是什么意思啊?+ R) f& e* K+ Y; M7 N; s* E
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) `0 x6 e/ h1 Z/ l7 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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