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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。
; |1 f; v+ J4 g4 p5 Hnetlogo自带的social science--traffic grid这一例子当中,1 H- L/ S9 I2 t% f) B
globals
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% p7 b& e0 r! C% k grid-x-inc ;; the amount of patches in between two roads in the x direction) B7 S1 y9 u4 C( G
grid-y-inc ;; the amount of patches in between two roads in the y direction( c+ Z" ]# F% S
acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 e' Y6 c0 X7 B5 S$ A; }4 n+ u% m* U ;; it is to accelerate or decelerate
7 H% A0 W+ C1 a6 b phase ;; keeps track of the phase
) S: S3 f. \% ~ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( L! h' J9 N0 `( K( ?: X
current-light ;; the currently selected light% p) Q' n6 c! ]/ k* S! ]! R) {
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;; patch agentsets0 _5 f- W8 Q- M( d* ?; k- H
intersections ;; agentset containing the patches that are intersections; k9 l, r/ z' t- @/ a; S1 t9 m
roads ;; agentset containing the patches that are roads
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' W6 b3 A \7 g0 [8 L- `, vturtles-own6 t1 |6 J* G7 l7 P
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speed ;; the speed of the turtle
) z0 I( q/ S% H" r; a" l6 {1 m/ T up-car? ;; true if the turtle moves downwards and false if it moves to the right9 J" H( \7 f0 R9 p" j! X
wait-time ;; the amount of time since the last time a turtle has moved: \ w: ]' f% P/ u
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patches-own
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) g! J! v4 b( W9 Q% f: W/ ` intersection? ;; true if the patch is at the intersection of two roads# @+ E+ W9 G/ p: w/ K$ Y
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
! e/ M( ?! S8 b6 K ;; false for a non-intersection patches.
3 F0 @% x* Q% d' i6 G* ]% G4 e my-row ;; the row of the intersection counting from the upper left corner of the
+ f7 L+ B& i5 B( Q- n ;; world. -1 for non-intersection patches.
5 C3 O/ i" n1 ?5 E9 N& K& v* y my-column ;; the column of the intersection counting from the upper left corner of the1 ^3 S; C5 L' @0 [7 d/ q
;; world. -1 for non-intersection patches.. V: ^, K, D. j7 P4 {3 o
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
5 B3 N, T, X7 H2 ~ auto? ;; whether or not this intersection will switch automatically.
4 K$ n7 f. R% f I7 \* ~" r ;; false for non-intersection patches.4 A$ k% L4 w6 Q" e9 X# v3 [! m D& U/ i
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+ w0 |+ p7 P7 j N8 B;;;;;;;;;;;;;;;;;;;;;;
8 ]3 u; J/ B% k& _0 J0 Q' s0 Q;; Setup Procedures ;;, w% {9 E0 Y* w( _2 Y; R) U+ u
;;;;;;;;;;;;;;;;;;;;;;1 e* M& c- b) H' ?
7 F: w# c, j( T; Y;; Initialize the display by giving the global and patch variables initial values.
+ |8 w' O1 t6 A) _3 G) @;; Create num-cars of turtles if there are enough road patches for one turtle to
7 o4 F5 ^0 H7 n;; be created per road patch. Set up the plots.
, C2 {/ E$ Z% L& V* Q( U) L5 Rto setup! R( _# R* a' @ Y
ca
2 w7 y, t# ^1 C* T! k/ i setup-globals
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;; First we ask the patches to draw themselves and set up a few variables/ |% W+ d R* q) d
setup-patches5 X+ a; u5 M) S+ Y; ^$ C _
make-current one-of intersections
/ ]) }' f& K' L/ X% { label-current
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% x; d+ o, r L# ^4 D; E4 H- d/ ^ set-default-shape turtles "car"6 z6 P5 Q$ Z5 g0 ?
) G, c0 W& a. w5 k, }) E/ D if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "7 p/ `# I( F9 A% }, ~: o& E
"road. Either increase the amount of roads "- P6 Y9 G; J* h& ^& S! S
"by increasing the GRID-SIZE-X or "
2 g5 [% b8 {) F# H "GRID-SIZE-Y sliders, or decrease the ": U# v" S% z( `: c) k' F
"number of cars by lowering the NUMBER slider.\n") \$ X5 L+ P# ^1 m* \5 K; l
"The setup has stopped.")
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8 f- [5 W% `/ J, R; t# i2 @' _. ~ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, C2 }) Q. c* `- f% w ^9 B crt num-cars
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& f8 X7 n& t4 S, n& \ setup-cars
4 c |" G8 E5 `8 R% s: \: m* `* D set-car-color
7 O2 h* g' K, j. [. | record-data/ G# {- N, i. Q/ x. d) A5 d6 C
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% b, X) S+ U8 d0 E ;; give the turtles an initial speed
7 |/ O5 ]6 F f ask turtles [ set-car-speed ]7 v& A& A, U6 h+ z* p
/ n0 B. X8 e; j; X- u# `! r5 A. _ reset-ticks
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;; Initialize the global variables to appropriate values0 A: e6 Q) V* }, f& J8 x( m( R) g2 q3 S
to setup-globals
: {/ W* P+ X6 t set current-light nobody ;; just for now, since there are no lights yet4 d7 E" r# @7 } x8 \$ t
set phase 0
S- z# P$ {6 g3 F set num-cars-stopped 0% H/ C' X7 y& O/ ^+ k0 X/ l9 w
set grid-x-inc world-width / grid-size-x
. B# V7 e2 q. j% u9 }' A& V set grid-y-inc world-height / grid-size-y# P# C q% N( n
7 x2 k0 R, e! P6 R, X& v; F* D ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 r. D. V4 _3 Z- d' I+ b4 P. K
set acceleration 0.099
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2 l: K: o2 I2 ~: x Y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! g7 I2 Q5 m! U3 u+ d ^# E1 d$ W8 y' ?;; and initialize the traffic lights to one setting# u" E2 V( I5 D/ C
to setup-patches
$ h/ ?: @, s' E3 m ;; initialize the patch-owned variables and color the patches to a base-color; F: G3 j5 R4 @* p8 B p
ask patches @4 r8 i8 s# c, @, |' n: L! ^: G6 ]6 @; I
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! s9 Q: ?' K( W2 @0 z9 h7 c set intersection? false* r R& E6 [/ A6 X7 z# q* U7 ]3 f( w
set auto? false( n2 e4 ~; W. q6 ?6 |
set green-light-up? true+ S O/ d3 _! J
set my-row -1
1 e# _' R; j$ J* B set my-column -1
/ j% X% M6 v+ ^1 q set my-phase -1
$ x% \% L0 j# e set pcolor brown + 38 U K: _8 @, I
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;; initialize the global variables that hold patch agentsets
$ Y P9 Z1 M9 R: o1 m3 j set roads patches with
) E8 U8 W+ ]* y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* k: ^- u7 P$ I2 _# X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: j" e& g+ x* L set intersections roads with
8 n) K+ Z2 j1 c8 C" @9 z: \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! u. d: `2 \( d7 Q% r& i
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 x8 J; }" g6 E; T4 j0 l
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ask roads [ set pcolor white ]# B4 g2 t Q) m
setup-intersections
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! _8 Y* M- g9 c% |% ?, w/ p其中定义道路的句子,如下所示,是什么意思啊?$ i& m, E C$ |
set roads patches with
, s/ R5 o$ P: ]* o# f( A [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
E0 Z* W2 Y& r/ K9 }: ^ S: y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- @: A* O2 J- D, o3 D8 F, S( c& }0 }
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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