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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。
. ~+ A! w2 O! z9 e5 |netlogo自带的social science--traffic grid这一例子当中,
% u' f1 X/ [7 @ Pglobals2 V2 f9 K$ g3 U! E" X$ W" A, {
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) U( A2 W" q9 z& Q+ S grid-x-inc ;; the amount of patches in between two roads in the x direction0 a% M+ B- h0 R Z Y
grid-y-inc ;; the amount of patches in between two roads in the y direction
9 Y! N% u6 N- C" ` acceleration ;; the constant that controls how much a car speeds up or slows down by if2 `7 P( @1 A) _, m4 _4 n2 \* z# r
;; it is to accelerate or decelerate
& A4 s# o: G3 D phase ;; keeps track of the phase# ^; i5 S* p% S$ }+ M* O* l, v5 S
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure* ~& t$ A8 K) T/ I- ]# [9 x3 [+ A
current-light ;; the currently selected light* ?* s7 [; \! V2 Z
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;; patch agentsets. j! R/ V, n( e" H) }$ F
intersections ;; agentset containing the patches that are intersections
# C9 a$ |, B1 d7 }' P9 Q) d roads ;; agentset containing the patches that are roads
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r* `" I4 o1 ^- V) bturtles-own* W8 ~4 H0 Y; d# Z+ j
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) U8 P" \1 A3 W4 h6 o, F speed ;; the speed of the turtle
`* @( j) W8 z: Z up-car? ;; true if the turtle moves downwards and false if it moves to the right# G# }0 E S' A7 E, e
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own1 Z/ x! F7 K, Z3 B% w
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intersection? ;; true if the patch is at the intersection of two roads$ \2 t0 x8 k! C+ H! ^5 j
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
9 r! M" O" R D5 x, p0 C ;; false for a non-intersection patches., p; _( \- i# t# I# }
my-row ;; the row of the intersection counting from the upper left corner of the. [# [7 [3 ?0 f' M
;; world. -1 for non-intersection patches.$ y7 S" H( n: X% v4 K3 q
my-column ;; the column of the intersection counting from the upper left corner of the7 t' L: r/ X8 C; I0 S6 Z
;; world. -1 for non-intersection patches.5 h) D5 s6 C* S* U5 i
my-phase ;; the phase for the intersection. -1 for non-intersection patches.& h1 K8 g- }6 H
auto? ;; whether or not this intersection will switch automatically. _$ z# e+ ^9 N/ @+ R6 D3 `, \/ A
;; false for non-intersection patches.. j c, P" j/ G F" y
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+ _+ J" l. R5 m9 }7 g;;;;;;;;;;;;;;;;;;;;;; C5 p- V2 t' r6 p; R4 [
;; Setup Procedures ;;; j6 V9 ?. J" ~3 A3 |& A
;;;;;;;;;;;;;;;;;;;;;;
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0 |8 Q5 L- f" ~;; Initialize the display by giving the global and patch variables initial values.
' H% @5 L1 ~% b3 L;; Create num-cars of turtles if there are enough road patches for one turtle to6 G) O) l3 ?/ U) O& o# s$ E6 J
;; be created per road patch. Set up the plots.
* m/ M7 {- u! k7 \* ~+ Vto setup
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setup-globals; k& `, n4 [+ n6 B- N; n' O7 G6 T
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;; First we ask the patches to draw themselves and set up a few variables
0 o8 ?$ p$ {1 R9 K8 }7 O setup-patches
6 s1 ^" [7 f7 Q# C9 k make-current one-of intersections
a3 n) e- P2 v$ e6 c: h; m& W label-current
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% L+ d Y3 U5 |8 N' m3 `% m& K7 w set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
- e3 t5 T" c9 D1 ` "road. Either increase the amount of roads "5 q4 p& D) m! V& s+ K+ Z
"by increasing the GRID-SIZE-X or "1 M* a& S0 m0 P! n/ e
"GRID-SIZE-Y sliders, or decrease the "
; V% ]# H4 m+ p2 s9 B2 \& | "number of cars by lowering the NUMBER slider.\n"/ V4 b! ^0 g' P8 f6 ^/ x1 n
"The setup has stopped.")* c) N' g! U; M; U
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* d8 S9 z0 Z0 y# @
crt num-cars
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setup-cars$ H r) T8 e! P9 d8 V' p
set-car-color
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8 @* E9 H9 o# S8 t$ H2 V% z' s ;; give the turtles an initial speed
y/ j9 b4 Q) z3 Q- `! W ask turtles [ set-car-speed ]# h! v% q1 `$ G' }
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reset-ticks
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;; Initialize the global variables to appropriate values1 K5 l/ ]& {/ t' K* P; j
to setup-globals
1 e. G) p: ?, d. y( H set current-light nobody ;; just for now, since there are no lights yet N: Q2 Y0 n% n) u
set phase 0, I; F8 W; h9 y+ K$ b
set num-cars-stopped 0
6 b- s) C* K3 f% k9 n, \! w set grid-x-inc world-width / grid-size-x5 J7 C7 W( l9 j8 i! k
set grid-y-inc world-height / grid-size-y1 I; g- \* O1 T3 H
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
5 c% N# `* M5 a6 C7 H. | set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
R5 V4 G! b8 V& t1 Y1 x: Y;; and initialize the traffic lights to one setting
% @4 p) L0 `' O) @1 Qto setup-patches- u; ^6 v& C; H3 y
;; initialize the patch-owned variables and color the patches to a base-color
: ~ L. Y6 d) k* T) m3 V ask patches
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set intersection? false/ E: p, t' c" ^$ V/ v
set auto? false$ x5 L6 Z: H/ b
set green-light-up? true+ r/ U* T* j6 m) x& C8 o
set my-row -13 |( o8 Q: b# [6 ?, c) a
set my-column -1
) l% C. r. W4 E$ _& n; E% T, | set my-phase -1
7 m9 ]3 B6 x, E5 s, X( \' F set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
5 {. \9 a+ i3 k) l$ p set roads patches with% W2 N1 u9 j4 n1 z$ j. q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! F/ D2 m/ g) [! ^+ Q* W6 I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& P6 b+ E# t* B) A
set intersections roads with
- s8 T* @7 e- V4 @! E" b) m5 e0 v7 e [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# }. [2 ?6 h' q6 O+ I4 \9 q9 {/ i (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: d7 Y8 R& L0 c
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ask roads [ set pcolor white ]
) Y( P; H# k+ w n) g5 M) [' Z. p4 ` setup-intersections
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2 P2 c, y# z' L- O4 T0 ~其中定义道路的句子,如下所示,是什么意思啊?; D$ z* l' M7 u" ~
set roads patches with
1 F3 a% p) J1 b* c3 ]( c. T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 E3 s% }, [ F4 S8 y" o- Y2 A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 c s# V a8 V
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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