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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。' t6 T/ {8 K, _3 y5 n
netlogo自带的social science--traffic grid这一例子当中,( H0 `1 p! Z: N9 u$ c
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction4 q' @9 X$ L& }2 z3 Z; {. O
grid-y-inc ;; the amount of patches in between two roads in the y direction7 d5 Q) b0 J$ a
acceleration ;; the constant that controls how much a car speeds up or slows down by if0 [4 v% K* ^, Z' @4 u: v+ \7 f
;; it is to accelerate or decelerate' l& c( ^% {0 W' S
phase ;; keeps track of the phase
* l! Y4 K% R6 X3 u$ V" ] num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 D$ P# x1 z3 _6 E2 {6 u# z" Y9 K
current-light ;; the currently selected light* ~7 U3 J5 y1 J7 B- o
. c$ |6 l6 d; u1 q ;; patch agentsets
1 L6 D2 F1 L( A% }0 U) ^1 B+ O! Y5 } intersections ;; agentset containing the patches that are intersections% b3 o% h$ D, J
roads ;; agentset containing the patches that are roads r8 I6 q4 P$ ?; {) }
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4 y/ [/ L( V6 [0 Iturtles-own. f. K" a4 @0 Z! B) ~$ H% y. B
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speed ;; the speed of the turtle
2 m( M& w& K- X9 ~ up-car? ;; true if the turtle moves downwards and false if it moves to the right1 V2 F; R9 {4 u! Z. m# W [/ f
wait-time ;; the amount of time since the last time a turtle has moved
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! V0 v9 j8 e+ Y$ a, L- Wpatches-own
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intersection? ;; true if the patch is at the intersection of two roads8 I1 |" n5 w7 [2 Z* Q' w
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
7 Y& h/ k) F& w1 g; S ;; false for a non-intersection patches.
8 S4 F; X& y2 D- ~ my-row ;; the row of the intersection counting from the upper left corner of the
/ O+ M! \" O$ b& s) Q* A+ m9 j ;; world. -1 for non-intersection patches.
) C: d3 ~5 L! y2 V! N! K k my-column ;; the column of the intersection counting from the upper left corner of the8 a1 W: Y2 D& t% E2 J4 l J# ?: }
;; world. -1 for non-intersection patches.
5 c/ b$ O' b+ w# v my-phase ;; the phase for the intersection. -1 for non-intersection patches.4 \1 F# i& k# b0 `1 ?. R" {& t
auto? ;; whether or not this intersection will switch automatically.
6 ~) d" ], Y* B ;; false for non-intersection patches.# `! v8 X7 L4 T/ [
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;;;;;;;;;;;;;;;;;;;;;;9 d$ }6 u3 p% B2 P6 V* A1 R
;; Setup Procedures ;;
* X; C* l, j9 d U# v- Q8 S;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
' x+ t2 I% {$ h/ g3 u i2 P;; Create num-cars of turtles if there are enough road patches for one turtle to: u7 v6 `8 | R4 o5 {9 \: A9 y
;; be created per road patch. Set up the plots.' W1 e Q# Q3 [1 [3 Q' P
to setup
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/ z8 o: ]1 {4 U# Q( D C4 q2 p setup-globals6 V H! Y8 v) z3 @# M8 v( H
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;; First we ask the patches to draw themselves and set up a few variables6 D9 U3 I- d3 f( q" A* G% k
setup-patches
5 V& l% T* S* K8 p* \6 b% b$ b make-current one-of intersections
8 q9 | |" K6 g$ R5 l2 D5 W label-current7 O; d' d8 r: T: v L8 Z
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set-default-shape turtles "car"
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8 V+ i' f! P4 r# r: w! W if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "5 T' q+ F" g, \9 R0 d; E) K
"road. Either increase the amount of roads "& w; k7 E9 E: t# V% Y% d
"by increasing the GRID-SIZE-X or "
! \& L" O4 _0 P5 E; x0 q "GRID-SIZE-Y sliders, or decrease the "
. H- ]# e6 r+ i; W9 s9 K "number of cars by lowering the NUMBER slider.\n"
7 F& l2 J1 B6 R7 H6 ^ "The setup has stopped.")
+ T4 N3 T6 G8 Y stop
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# J$ f$ A$ t! R( t$ B ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* e) |8 q/ S B; }. J( @- @& J crt num-cars, W4 r" \! l j, T# B
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setup-cars' Q7 B' c0 c3 L( ~4 z- p- z* M I
set-car-color; m2 P5 Z4 K v0 [$ A) J
record-data
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;; give the turtles an initial speed( Q) ]) A3 A" m2 C' @% r
ask turtles [ set-car-speed ]
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$ f+ _4 M- I& c" a reset-ticks
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;; Initialize the global variables to appropriate values/ F1 H0 P' [) g1 ?2 r, Q- L2 t
to setup-globals
4 H, A7 i5 `+ g4 m9 Q1 R set current-light nobody ;; just for now, since there are no lights yet% C8 \' K0 [4 ^9 S3 c( z
set phase 09 F% t* Z1 U+ A! }
set num-cars-stopped 07 H! X& E! X- B# \; t; d% j2 \9 W
set grid-x-inc world-width / grid-size-x' ]4 I9 A5 X3 S* |* k* `
set grid-y-inc world-height / grid-size-y
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( } t0 q- w# o) N ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
2 s( R2 V& [. n/ S" w: H- ` set acceleration 0.099+ G& K8 m: w/ J5 J2 ~4 @
end9 x5 e0 g$ ~! @: {% \
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 a5 @( ~" O# }% E X) ^
;; and initialize the traffic lights to one setting
! h- _5 Y- D' I# L6 Jto setup-patches1 ~, p% T* g0 h/ }7 Q) X: M
;; initialize the patch-owned variables and color the patches to a base-color
) u* A q0 z/ ]5 e ask patches
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# W) |5 e6 c9 _- K: k* ?: y; Z+ x. p, ] set intersection? false+ G3 G2 V; b/ N9 H$ D6 c
set auto? false; l2 S2 D( e; J7 G5 R) X) D- Y' U
set green-light-up? true
8 a$ D4 S5 k) K; c set my-row -1! i* \1 V( H: T# R
set my-column -1$ r& O( I0 L% y+ }2 h* e$ p* |
set my-phase -12 S; h" b+ q) F( t5 d( ~/ f! O0 M
set pcolor brown + 3& z( z6 h1 @" {
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: S9 i% _2 m: ^$ | ;; initialize the global variables that hold patch agentsets5 X# U) N# r+ _; Y
set roads patches with
. ^; J7 d1 ~9 T5 L" G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- h* ^) w& {4 [" N (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! j+ R6 z8 D& { set intersections roads with
/ [" ]0 X$ s, I2 m% o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ \ S& H: D. a; R) Y& m
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 F+ |# Z* d, ^0 w" K( o4 [6 I2 e
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ask roads [ set pcolor white ]
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8 T' Y3 G$ f" p' k* _9 `# _8 k其中定义道路的句子,如下所示,是什么意思啊?
& o* c" H/ [0 e1 z set roads patches with
/ L7 `+ Q! n1 @/ `& F3 f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 v9 g; ]. \- E: o (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 o) I- e2 P! Z) Y# d2 Y; p
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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