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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。
# z. ^8 R' [ w% snetlogo自带的social science--traffic grid这一例子当中,
; }0 `9 \. B- mglobals
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4 y2 C* i. B% x C2 g- f grid-x-inc ;; the amount of patches in between two roads in the x direction9 o4 r- h: h' f) w
grid-y-inc ;; the amount of patches in between two roads in the y direction
: I9 H6 S2 V8 O6 T4 }6 r5 l A acceleration ;; the constant that controls how much a car speeds up or slows down by if0 c; l: v0 c- ^/ H3 A! |
;; it is to accelerate or decelerate3 G, G$ U, f6 r4 M( b \
phase ;; keeps track of the phase
1 z! ?# N) u; t H. ~# O num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure+ ^' V3 d; a6 \1 t3 E }0 ]2 K
current-light ;; the currently selected light6 q/ P. Z/ q2 M5 e# X
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;; patch agentsets
3 }. j. U% ~) W7 w& E! i intersections ;; agentset containing the patches that are intersections
+ z5 C5 X; w6 S8 N `: Z roads ;; agentset containing the patches that are roads
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turtles-own
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; c/ `9 B! v1 l6 A2 |( m! d speed ;; the speed of the turtle
2 F' g+ O* f! D9 d up-car? ;; true if the turtle moves downwards and false if it moves to the right
. Z& n9 n! i* ^, p# k) v { wait-time ;; the amount of time since the last time a turtle has moved Z! W- y F5 n
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads) a! B4 r4 U- X+ S+ I* I; p
green-light-up? ;; true if the green light is above the intersection. otherwise, false.! T2 ], h1 ]) r3 y+ S% n& ?( R
;; false for a non-intersection patches.# ?4 _$ {; W2 S6 S/ k. C
my-row ;; the row of the intersection counting from the upper left corner of the; Q8 \. W$ l; r5 o3 W
;; world. -1 for non-intersection patches.
, o. P) C' p! _. Z" v |2 t my-column ;; the column of the intersection counting from the upper left corner of the
8 j0 f- l! ?9 Z0 o# c6 I ;; world. -1 for non-intersection patches.$ [! o! v( S) R0 l9 M
my-phase ;; the phase for the intersection. -1 for non-intersection patches." T- E9 {" \5 g- b; q
auto? ;; whether or not this intersection will switch automatically.
" f! ?4 _+ v3 h* R- P5 Z ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;( _7 ^/ S8 Y# K" \
;; Setup Procedures ;;" G' v- A2 ^. t# I, u, g! [% o
;;;;;;;;;;;;;;;;;;;;;;8 N- o7 r, {1 o
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;; Initialize the display by giving the global and patch variables initial values.0 m6 B; r* Y6 _8 q
;; Create num-cars of turtles if there are enough road patches for one turtle to# n7 G* \9 W8 y1 v) J
;; be created per road patch. Set up the plots.
$ _* ]3 N8 q% K8 ~" l& m/ cto setup4 l' L3 U& c! U" n* j" z+ k
ca
( @- Y/ p1 `& ~6 V setup-globals
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/ e" L& m- N4 H2 E ;; First we ask the patches to draw themselves and set up a few variables
& p4 v5 X1 ^$ q+ l/ x% [ setup-patches
' U- V0 H) i3 o make-current one-of intersections
) c" O5 _9 ~( a2 {) u label-current7 m* q7 S: I: G; x8 d% e
4 u+ L! O0 ~+ a) E8 a9 Q" ^ set-default-shape turtles "car"
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/ G* {: O. r; C' d* t7 H. D8 Q+ w if (num-cars > count roads)
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; @. V5 j1 }3 P D$ [' R; ] user-message (word "There are too many cars for the amount of "& } t3 m* O# z% Y. a+ M _% z
"road. Either increase the amount of roads "4 L! T; M8 C7 J. \7 g. U" i/ i0 X
"by increasing the GRID-SIZE-X or "
. j+ X8 w; Q4 K4 W' f) U "GRID-SIZE-Y sliders, or decrease the "
# }4 Z5 O) `$ Q "number of cars by lowering the NUMBER slider.\n"
0 x, Y2 j8 X) c+ I5 m+ O( z9 ~/ d. B "The setup has stopped.")
: m1 P% \" L, q$ X/ H) o stop1 e2 k! @4 w# e: }
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% P7 A3 _5 x4 ?
crt num-cars$ R' Q N# m/ N; N; B( g5 e; { \
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- k0 x3 {- q$ k* J& T/ h setup-cars
% O. w# w9 G8 C( ]$ L" K0 ` n2 M set-car-color* y* j& z1 f. C
record-data
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;; give the turtles an initial speed5 w7 n: P" a1 l4 W; Q) J- V
ask turtles [ set-car-speed ]4 p. h7 W! a' Q& O! v9 Y
( k5 t: H: w$ V! d! l, f reset-ticks
5 j8 p) B% O8 \end
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$ N$ R/ t7 P v9 d2 ~7 ? c# W; O8 r;; Initialize the global variables to appropriate values
9 j2 b B2 G% I3 t6 sto setup-globals
5 U4 q9 n7 r s1 o# E8 A1 u! _ set current-light nobody ;; just for now, since there are no lights yet1 q2 i" [% @: {
set phase 0
$ I9 y( R, M7 i set num-cars-stopped 0
- Z$ k+ Q+ o2 t set grid-x-inc world-width / grid-size-x
3 s7 ]( D0 B0 ^ set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary+ N3 M: Q' d7 s6 Q/ e Z
set acceleration 0.099
$ r7 A& _! ?3 @' J) X8 r4 Oend) a6 g2 t! o5 O- t9 F2 z
: Z( i# p$ c6 q8 F2 f, f" Z;; Make the patches have appropriate colors, set up the roads and intersections agentsets,! G1 a1 v9 D. a- |5 g& V0 m: k
;; and initialize the traffic lights to one setting7 W# m* w. S, _4 R4 I1 j" E
to setup-patches
6 m; o. R m) K5 J! | ;; initialize the patch-owned variables and color the patches to a base-color
/ J+ `* h/ ?8 T, M' p7 J6 n! Z6 _* r ask patches
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' Y5 [8 W) X' a+ s% G5 I set intersection? false4 F: m1 k5 y h1 W& \' l4 l9 \% d- \
set auto? false, w; Q- x+ U& r8 h# O- Z! h
set green-light-up? true
) i# q% f, b T( m, J set my-row -1 B9 k6 D1 z; N x# I& M
set my-column -1
2 @; Y. O# w. F8 K6 ` set my-phase -1
1 S1 i- y5 T5 d; X7 ?( S( ` set pcolor brown + 3
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" \% d3 l' ~+ w8 ?) c ;; initialize the global variables that hold patch agentsets
% Z" c8 R' a4 @7 I' g5 _ b set roads patches with* d1 Q) D3 L8 ~% c$ @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 k T0 B6 Z6 O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& i/ I. d& j+ F- i set intersections roads with# P8 y3 u1 K" e' C; A* w7 j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- k( U$ S7 n& G* g" w7 h- X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* V5 C& m3 B5 j p
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ask roads [ set pcolor white ]
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end
5 {8 g0 w$ K! E! k0 F) {其中定义道路的句子,如下所示,是什么意思啊?# _# |, C7 ~0 ?0 X# |
set roads patches with
3 \; L; R5 \5 e% W9 |5 e [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 I7 h, e' M- b4 z5 U' A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]' s$ b9 }- l) c9 J5 n6 s3 g. X
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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