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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* W9 @) {9 e: t |2 Z$ I* x$ Enetlogo自带的social science--traffic grid这一例子当中,6 }- {4 @ p+ Y. |# l$ H
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
' T& {% q t! k+ F# B5 ~ grid-y-inc ;; the amount of patches in between two roads in the y direction$ X7 X( z8 ]& O0 h4 [+ V! {
acceleration ;; the constant that controls how much a car speeds up or slows down by if
- k% e5 r0 D# L# [' q s ;; it is to accelerate or decelerate8 `- c4 d' r) w3 p( W( Q
phase ;; keeps track of the phase8 b, w' x+ b' Q* _; O- ^ @
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure, _+ r' E" X7 u$ E. `4 S/ J* o, a
current-light ;; the currently selected light
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;; patch agentsets& n2 H5 ? _9 I C2 |# `& N
intersections ;; agentset containing the patches that are intersections6 @; h% N( j1 j3 \0 D2 Q# S
roads ;; agentset containing the patches that are roads; m: ]2 U U7 p8 X# U/ f3 i! ^8 @$ M
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2 p7 W) t/ `/ @turtles-own4 A4 w" O* ?8 v# V1 d3 b3 Q6 ~# v
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speed ;; the speed of the turtle% Q; w4 [; i6 R J
up-car? ;; true if the turtle moves downwards and false if it moves to the right; F/ f1 k; Q+ R) W( r+ w
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
- D; G! V, t0 | green-light-up? ;; true if the green light is above the intersection. otherwise, false.- |8 a5 s: w1 z3 d" }; G% J/ U, R
;; false for a non-intersection patches.5 I! [! R3 }! C& D+ c1 j
my-row ;; the row of the intersection counting from the upper left corner of the: O- v7 |, j" s% F
;; world. -1 for non-intersection patches.4 @: f" ]. R7 l3 y) q: X6 R0 |7 a+ [
my-column ;; the column of the intersection counting from the upper left corner of the
; I/ }8 h, ^. R! P) N# R! ^ ;; world. -1 for non-intersection patches.: B& b8 h; A' v4 A: j$ |
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
/ s" R! t0 n: Y auto? ;; whether or not this intersection will switch automatically.$ G* }2 Z- w' C4 B8 G
;; false for non-intersection patches.
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) ?4 R' f& o, t7 f) e;;;;;;;;;;;;;;;;;;;;;; ], e) k* f' ^0 I' G2 d
;; Setup Procedures ;;- g0 L$ G" }8 Z
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
# ^: ^3 i! j6 c! M;; Create num-cars of turtles if there are enough road patches for one turtle to
5 }6 e4 a, n7 a2 F" D;; be created per road patch. Set up the plots.8 O, E/ a; J3 v/ @
to setup. L+ m% D- A! o. P. Y4 Z1 n4 z- Y
ca
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;; First we ask the patches to draw themselves and set up a few variables
5 y, s. G4 z9 h1 A5 g8 q6 x setup-patches
! k$ S) K/ |$ Y8 u make-current one-of intersections. d7 {: z8 s( D* C" |
label-current
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7 D% }' h) O& A. z set-default-shape turtles "car"- z6 N! x/ q: q' \
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if (num-cars > count roads)# ?: Z! o* `, x+ Q& ?
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user-message (word "There are too many cars for the amount of "
% M$ x' n6 @4 v; c "road. Either increase the amount of roads "
/ |3 `0 z" a# |( ^. y) p "by increasing the GRID-SIZE-X or "2 |5 k5 L# s( k1 y# T; _
"GRID-SIZE-Y sliders, or decrease the "" C A' v: t* ~! N1 S( x
"number of cars by lowering the NUMBER slider.\n"* c; e5 N1 i/ l( U( S& |6 T: s
"The setup has stopped.")0 v( H+ g2 s6 n) k3 y8 m* i6 ~
stop+ e; k$ c2 t$ L
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 k3 {/ Y7 l# z; X/ | crt num-cars
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' t. m7 _' _3 m8 e+ y$ s" F; s# H setup-cars
- r/ w! w& x5 @6 W$ d4 a p set-car-color
: }2 @, R4 s5 s i8 y9 f record-data/ H, _+ \* E- a) `+ q
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; L l; X: w* v M$ k. \# e+ N% L ;; give the turtles an initial speed
8 E8 A4 F- ?/ [# t6 I' R ask turtles [ set-car-speed ]
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, A0 } O& T1 [9 G reset-ticks
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8 q8 |2 d/ X* X* @ z- Q$ H* o;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
9 e, }7 l+ }( J) z3 ]2 b$ Y; ^ set phase 0
% ^# |5 ?, ]/ h8 v* s" B set num-cars-stopped 0; _2 f( B5 q3 e9 ~
set grid-x-inc world-width / grid-size-x
2 b9 \0 _) E, G) F/ Y set grid-y-inc world-height / grid-size-y% L! |# A4 ?1 h9 t! I L
6 P/ e7 N4 q9 T) j ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( V, L# Q2 V+ _% |/ l7 L- I3 i set acceleration 0.099
q! ?1 t) v S7 @; P8 Iend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; t- z9 g) j# C# M4 d9 C;; and initialize the traffic lights to one setting
! P p# s/ y: g. |3 c/ \to setup-patches+ y% e$ l, `8 A& i
;; initialize the patch-owned variables and color the patches to a base-color3 C4 O4 j& M3 N) B* q
ask patches
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set intersection? false; o2 l$ O& ^5 J5 s' k( D
set auto? false5 T/ K4 ~+ r. S9 s, D
set green-light-up? true1 L9 f: |! T- {1 k
set my-row -1" U+ z) l! M% T- ^6 J8 H
set my-column -13 z5 i+ c# P. h/ D8 {( A: R
set my-phase -1
9 `( H! f, c, v( ?; u set pcolor brown + 31 i0 E/ K, ^. g- _; x: ?" c
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8 V e5 R& A6 g" a! o5 X8 Z0 x0 K ;; initialize the global variables that hold patch agentsets
8 l) {1 ]' a0 L- `- ~ set roads patches with
( U- n+ h2 `. y. R3 _/ O% Z. l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- s. ~: t. o$ F: h (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ Z9 \ Z7 L9 X$ w- |5 P set intersections roads with3 p8 o2 m% s- a% z0 a; M- e4 @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* j$ G3 o) K$ ]6 _2 J$ {5 J' c. A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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4 F0 Q$ q6 b) t8 s5 b: k ask roads [ set pcolor white ], f( t/ F8 L" C' P
setup-intersections1 a* S' ~" g% ~% v
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其中定义道路的句子,如下所示,是什么意思啊?* X1 _4 ^0 q0 D+ d* N
set roads patches with, C* i! ]$ K; ~" b1 U
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& ~# h% g5 ]( z: e+ i1 \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* Z% h7 w/ P4 ~$ l; |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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