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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。
: S7 G3 w; o) s; [5 Z6 E; h! I0 xnetlogo自带的social science--traffic grid这一例子当中,
; a* S, G, |6 Y1 qglobals4 m0 W$ d u7 h; g1 C
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% |; k% g, E! W7 a6 K8 R5 b6 t' M grid-x-inc ;; the amount of patches in between two roads in the x direction8 w$ }7 A2 v2 Q* f
grid-y-inc ;; the amount of patches in between two roads in the y direction2 J2 ^% o# N- Z8 }6 @
acceleration ;; the constant that controls how much a car speeds up or slows down by if/ L) y( B6 W% S! E, e
;; it is to accelerate or decelerate5 b3 D- o/ [6 G" V/ o- E! O
phase ;; keeps track of the phase3 G. c5 P0 }! l% s. \
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
, @( m: M4 K: Q) N+ v" t0 Z3 J) F current-light ;; the currently selected light4 ]2 \' [( e* p% `# \4 S" X
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;; patch agentsets0 J6 D' Z9 y! y' z3 s
intersections ;; agentset containing the patches that are intersections
3 d, R' L* e+ G' K8 c roads ;; agentset containing the patches that are roads, ^( ~% @" \1 J0 p2 J/ w
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7 z$ q5 n" m+ y1 Xturtles-own! }- d R) G. ^& x
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$ m+ k% J/ `4 e) b4 K speed ;; the speed of the turtle
* [& S. G9 D1 a% W; R up-car? ;; true if the turtle moves downwards and false if it moves to the right
+ w$ ?7 ]8 A( G4 Z k4 q wait-time ;; the amount of time since the last time a turtle has moved1 T0 G P* h4 L. X8 r# x
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patches-own; {/ l% S$ [2 w# `8 ?) {; [
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intersection? ;; true if the patch is at the intersection of two roads
! x6 P/ G6 a. A8 \2 B green-light-up? ;; true if the green light is above the intersection. otherwise, false.
" X6 A, Y3 n9 v [/ y2 t! q ;; false for a non-intersection patches.
/ B5 Z- M2 K8 {% W my-row ;; the row of the intersection counting from the upper left corner of the( g, y+ b$ U$ ^" `5 Y# L ?: V( }! m1 b5 e
;; world. -1 for non-intersection patches.! e! f# d2 |& c X3 C5 ?% X1 w9 v0 f+ m7 o
my-column ;; the column of the intersection counting from the upper left corner of the8 {& m) B R" J
;; world. -1 for non-intersection patches.
/ D0 I: m6 h t4 H5 ^1 b8 I, c my-phase ;; the phase for the intersection. -1 for non-intersection patches.
$ C5 b( \4 H0 ]( a& P# A8 ~ auto? ;; whether or not this intersection will switch automatically.
0 Q2 k5 c1 f" r$ y4 f ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
: \5 o/ d5 k u0 i;; Setup Procedures ;;
2 a* N/ E+ W% V* a/ n5 J, U. N% p" E;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.3 j+ p+ ?1 w* u9 W! c
;; Create num-cars of turtles if there are enough road patches for one turtle to( N( C! Q% V+ w& U& X
;; be created per road patch. Set up the plots.
4 s! T' V9 R7 Y1 O! c9 e$ Nto setup# U% Q3 O3 u! S4 g6 d! H
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setup-globals; c0 }& z; F3 t' Q1 B5 S4 n
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;; First we ask the patches to draw themselves and set up a few variables9 R* l0 Z9 _# R2 W( k- a
setup-patches
8 ` K& F# R9 u7 ?+ e9 m2 [ make-current one-of intersections
) F3 t: T4 u$ |: b# G9 n0 X5 m3 @ label-current
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set-default-shape turtles "car"* E! }2 w0 q4 y" E4 B( w# e1 b: ~
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if (num-cars > count roads)& P' }- `" m; ^5 Q
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: p% B9 c0 W. t/ ]7 [ user-message (word "There are too many cars for the amount of "2 V* O/ b" q! |$ H5 X" d# w
"road. Either increase the amount of roads "
* N. {( x9 E' ~+ Q* t' E! y "by increasing the GRID-SIZE-X or "+ F y9 C4 X3 u/ \, D! J( q
"GRID-SIZE-Y sliders, or decrease the "6 o: J6 A7 a" _2 b) ]
"number of cars by lowering the NUMBER slider.\n": D( x) w! A& I3 o6 h" E; P
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ |- i( G- h9 H( u+ ~
crt num-cars7 i* h8 r/ {( t) N+ c( k
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" C0 R' r, U, o6 _8 D3 C setup-cars* G9 e% `( ^: l* h* w2 V L
set-car-color8 F0 B y" G" q
record-data
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;; give the turtles an initial speed2 f$ F) L% L, N
ask turtles [ set-car-speed ]
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reset-ticks/ V9 q- F% b$ h! G' E8 E3 f: C
end
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet- i- m3 i# y! G
set phase 00 ]5 j2 o$ k, ^- G& W5 g) a
set num-cars-stopped 0
F3 e) N4 t' u/ t7 _' e6 V5 t set grid-x-inc world-width / grid-size-x
2 k! K! {( Y4 l O; ?, z2 P set grid-y-inc world-height / grid-size-y3 d( T( V& Y3 {+ `3 C2 _" {: n" L
( B$ S ^7 e# v p7 h9 G ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ M' E$ k% p1 D5 j! A# V
set acceleration 0.0999 e; R7 X# G& }
end: G$ f6 x' j# B1 S; h
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) h/ B' m. R7 l, R: M/ G" v1 |
;; and initialize the traffic lights to one setting$ d% h& C# W- i9 m& X/ [+ v- O2 X ^
to setup-patches
; N: U9 H9 r0 {. J+ N4 W ;; initialize the patch-owned variables and color the patches to a base-color' y" k" K; J- I P5 T) z
ask patches
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; H/ j* I# Z, \ A- Z) K- I set intersection? false4 ]/ z. k# n$ m6 x. _1 N
set auto? false
% g0 B( m$ Y, o# X B0 q, P8 K. o set green-light-up? true5 C1 Z% G; o1 V& Q1 i& t$ ?
set my-row -1
, E W- @9 r1 M! o0 i6 {" g8 P set my-column -1
2 Q- [# j( l# b+ m$ }5 U9 x set my-phase -1
8 T" y4 e3 P& z! A8 `" D8 r$ u& z set pcolor brown + 3/ o" |' U: s2 |' R, d
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;; initialize the global variables that hold patch agentsets
1 Z3 [" @ |8 \ set roads patches with' e! {) q, ^6 U4 M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' Z) e' {6 @! l w* B
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 G) q+ B1 |" X1 `( w% w) U9 N" c+ B( U2 O
set intersections roads with; K K( x p. _! h4 b2 |0 x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
8 x) m/ E9 P$ u# ]0 b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
8 L7 D x' a: \: ]8 m; }- r- R setup-intersections
2 T. I" I+ V. p7 \, l Qend
/ ~9 r ]6 X- |9 R其中定义道路的句子,如下所示,是什么意思啊?
2 r$ |% _0 ]: |1 o% m& @; ~ set roads patches with$ M% l( B/ }2 I' I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 Q7 j& n. l) q: C" T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 d( J+ d2 I- ?! \5 r
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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