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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。" e) H+ @! e! n" [- Y! f) ~- w
netlogo自带的social science--traffic grid这一例子当中,% X0 }$ X1 L' z( W
globals2 F6 `# o" j7 f7 A7 o: @
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grid-x-inc ;; the amount of patches in between two roads in the x direction; x5 N/ s( S8 p, z( I1 v- i; h& Y
grid-y-inc ;; the amount of patches in between two roads in the y direction. }# g+ b, ~; N l% X" d' P3 b
acceleration ;; the constant that controls how much a car speeds up or slows down by if9 A1 v, [3 g! f0 z$ V& ]
;; it is to accelerate or decelerate0 s; K9 {4 c+ V
phase ;; keeps track of the phase7 F# {. p/ M9 E9 n) L5 |
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
, ~4 ?6 e. h. p- l! i% R current-light ;; the currently selected light& N3 }9 ^! N9 V2 r3 L
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;; patch agentsets8 x( Z& I! s: `" b# f9 Q
intersections ;; agentset containing the patches that are intersections
: p- i1 w) ?+ \9 a3 ]9 h } roads ;; agentset containing the patches that are roads+ [$ \) W6 r$ ~6 ? H: J
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turtles-own7 h& l+ u& q2 j6 n* A3 L
[
) I( C6 ?4 B, v1 _ speed ;; the speed of the turtle- a! K7 Y) K9 i. M
up-car? ;; true if the turtle moves downwards and false if it moves to the right
+ L: ?9 m$ v) W( G9 t8 U" r wait-time ;; the amount of time since the last time a turtle has moved
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patches-own4 E. J6 c! V8 e2 c1 ~( h
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intersection? ;; true if the patch is at the intersection of two roads( S$ B" M* g; S- p1 M e
green-light-up? ;; true if the green light is above the intersection. otherwise, false., q5 ^4 u. r# p5 }( t# [
;; false for a non-intersection patches.
" f; |& S" I3 }3 p( E my-row ;; the row of the intersection counting from the upper left corner of the
1 t; }4 _& x, P5 C/ @' x* V+ P! e# l ;; world. -1 for non-intersection patches." K4 R2 d, i. K" R% k- x
my-column ;; the column of the intersection counting from the upper left corner of the5 F1 ?' f. |, s& _; |
;; world. -1 for non-intersection patches.
* J4 F. ^9 X4 z% d9 U! `' M my-phase ;; the phase for the intersection. -1 for non-intersection patches.
9 _3 S# h2 a1 I. ^ auto? ;; whether or not this intersection will switch automatically.( _) {7 r( D9 ]1 Y3 x7 }
;; false for non-intersection patches.4 u" h4 ?# A$ U/ M* t
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: b% A9 Q6 h+ I- c;;;;;;;;;;;;;;;;;;;;;;
; ^1 p: m5 S) r( Q: B6 }0 s$ N9 T;; Setup Procedures ;;
: T4 W* F4 A2 h# e$ a. v7 a/ K;;;;;;;;;;;;;;;;;;;;;;4 R1 |" X9 F% F; @' l* V! C% W
1 ~% v4 K6 ]& G) a# S;; Initialize the display by giving the global and patch variables initial values.
5 s) a Z1 H- B1 L* {6 F+ G;; Create num-cars of turtles if there are enough road patches for one turtle to
6 h; x4 V5 h3 ];; be created per road patch. Set up the plots.
3 o/ w5 L/ o9 t+ l) _6 a# M+ z# Kto setup3 T5 o& g! n( }1 S: d1 v2 V; k, ]
ca
3 U8 V9 `4 K& m, v" C setup-globals2 ^5 J4 ]2 P( {4 N4 J
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;; First we ask the patches to draw themselves and set up a few variables
+ i _. y" D: L6 E8 i0 A) ] setup-patches5 U) L: O0 i1 Q# v: w+ Y
make-current one-of intersections: |2 @- S; c- @5 D4 Z
label-current( l& W8 @% f# X' y m1 W% V% x
- d* O2 Q( o* S4 Y/ E2 y2 j set-default-shape turtles "car"/ M: W0 n! s# \& G
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if (num-cars > count roads)/ `" o+ W, c2 |% n8 k! E$ G% P
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user-message (word "There are too many cars for the amount of "* e: t$ F' h6 z* X' R- R
"road. Either increase the amount of roads "8 k) G6 c- s' Z3 p# J7 F: N
"by increasing the GRID-SIZE-X or "9 Q& s" P0 P- i3 Z* D0 \" a- [ Q* b
"GRID-SIZE-Y sliders, or decrease the "8 O' _' J9 A6 A$ r
"number of cars by lowering the NUMBER slider.\n"2 B. r5 p0 Y* q; J3 L6 P
"The setup has stopped."): a/ F2 p( x5 a# g3 O2 {( Y9 D1 D$ u
stop+ H1 X- a2 E" c
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. I+ |1 i4 T4 x0 _2 F P: ^& a' r% d3 g ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 Z( Y) R( ] a" @/ ]3 s
crt num-cars) [; ]7 f( e7 \. F
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setup-cars; o5 R$ M: [4 ^
set-car-color2 A4 m0 {/ a) \+ O0 y
record-data
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;; give the turtles an initial speed
* u3 s5 M! l. S" D { ask turtles [ set-car-speed ]
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reset-ticks
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; x! S, |' q* _;; Initialize the global variables to appropriate values, j( A3 S F/ ?. ^ M* d
to setup-globals
4 A( v4 q1 h, u7 s2 U; I2 j set current-light nobody ;; just for now, since there are no lights yet
; J9 K( X! o( a. y( S set phase 0# U$ a6 k; r/ A' ]3 c, N
set num-cars-stopped 08 h, `- s3 C/ t
set grid-x-inc world-width / grid-size-x
$ V! z$ ~$ v* K set grid-y-inc world-height / grid-size-y% [0 g: U6 |6 E# Y5 o/ ^ y+ f
C2 v/ o5 i. ?; g F8 z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary; F; P$ Q/ b0 B1 K' h/ H
set acceleration 0.099
6 t$ O3 c* n1 K1 b5 k' d9 Oend* J% \0 e- @2 p; {: }# {2 a
% t( J8 q1 C% _, m6 n;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 @+ ~% S/ e1 h' L" s! n6 G;; and initialize the traffic lights to one setting
# w8 p6 N; m" Z2 p. w% Cto setup-patches
1 a8 ]6 e6 V2 }- n, p" Z$ f$ V/ } ;; initialize the patch-owned variables and color the patches to a base-color$ @, y* |1 |7 X5 W2 A0 z [& K q6 }
ask patches
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/ X7 p! T F: H L- _+ s# f* N. l set intersection? false" g0 {# w* P! Y: }% S; {- e
set auto? false
5 `* s" b: ]. t7 `( r set green-light-up? true
" y. W; p# n l# c* G! l set my-row -11 G, M4 N8 o# T
set my-column -1
: U" ^ v5 B8 J% H' J# @9 s, @1 t set my-phase -1
# m) t! z3 B7 [' j- K set pcolor brown + 3
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3 c$ U6 i% m, q1 ]) w M( n ;; initialize the global variables that hold patch agentsets
1 ^* m. e" p2 {. w' x( E set roads patches with
/ d3 }& a5 S3 U8 _; H% L [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ i$ y: [. l& D6 ?: O( z/ x6 W
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; w( |( u/ F0 w7 e
set intersections roads with6 e% A- M8 G5 b$ _# B7 `( m2 i
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& Z! b9 b, y1 A (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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4 s. r1 [5 R Z4 Y2 E其中定义道路的句子,如下所示,是什么意思啊?3 Y" C+ y( n7 A7 @6 h
set roads patches with
8 R3 h# L- W( z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 D: f; D% ]$ G! V (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! M1 Z0 | m, j2 l* m3 Q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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