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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。
- a, w1 y: R$ G- c1 w+ C5 snetlogo自带的social science--traffic grid这一例子当中," Y) z9 n1 h& d
globals/ w6 i: h1 J) q1 N/ z6 j5 C1 f0 h
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grid-x-inc ;; the amount of patches in between two roads in the x direction
. E ~/ {& P t+ l( h V grid-y-inc ;; the amount of patches in between two roads in the y direction
" q0 A1 F* Q/ o3 r$ B3 F acceleration ;; the constant that controls how much a car speeds up or slows down by if2 b* v) N4 m: G9 p- E+ f7 Q
;; it is to accelerate or decelerate
% X' o" B$ W2 V/ M- ~2 r7 P, | phase ;; keeps track of the phase
4 w' S; D) _5 N7 Z/ l6 g num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( P/ q9 p8 c* X F* v9 B6 w& G; @
current-light ;; the currently selected light
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( q9 \2 x" v8 G: G7 ]3 b7 I' V& T ;; patch agentsets
, B( G& e+ C. G5 g! R0 N intersections ;; agentset containing the patches that are intersections! e) Z# Z# {' s0 M
roads ;; agentset containing the patches that are roads
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/ R: r" G) p" Lturtles-own4 \. G7 Y" {& j3 @
[
1 A4 D9 V& L$ R& ~+ o% O* z! Y speed ;; the speed of the turtle
" x' y6 @% Z. t up-car? ;; true if the turtle moves downwards and false if it moves to the right$ }$ m0 B' a/ Q4 Y. |
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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4 I. v$ S: {. R8 l* e/ Z0 H3 i intersection? ;; true if the patch is at the intersection of two roads& Y; W% t/ m7 F! l) Z
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- v4 n5 ~! m0 F& I; k* U/ c ;; false for a non-intersection patches.( p- p2 c1 y5 p+ s% d {
my-row ;; the row of the intersection counting from the upper left corner of the
' v5 r* `1 C1 \& e ;; world. -1 for non-intersection patches.
4 u* O. z4 w+ o& a D t+ ] my-column ;; the column of the intersection counting from the upper left corner of the6 V. A; x7 {- c
;; world. -1 for non-intersection patches.: N5 V3 s/ U- |; y3 J9 Z
my-phase ;; the phase for the intersection. -1 for non-intersection patches.- E# p# a8 y1 w$ \. W
auto? ;; whether or not this intersection will switch automatically.; `& z# p4 W$ a8 t3 k
;; false for non-intersection patches.7 I( _2 Q9 T `3 a- U( P
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/ @6 f) i. p8 Q- e( V9 N( `) @;;;;;;;;;;;;;;;;;;;;;;. ]8 G$ `" P' L$ [5 G* r6 f/ ?. n
;; Setup Procedures ;;! p( P m- |6 N5 M4 ]2 ?7 c# M, K" }
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u; D" A& M. x" n$ V- ^;; Initialize the display by giving the global and patch variables initial values.
2 L. T! V) L5 [ B( X1 F1 \: z;; Create num-cars of turtles if there are enough road patches for one turtle to
5 {/ L2 u* x! t. ?) z;; be created per road patch. Set up the plots.( ` w" ~) e3 s2 {2 T% v! @
to setup
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4 G8 w* N; K2 A% i; U setup-globals: D5 \2 H2 `' A& e/ e ]
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;; First we ask the patches to draw themselves and set up a few variables
9 T, l" Z5 P+ ?& P# Q setup-patches
* b# A, q, `$ c! z make-current one-of intersections
' P7 i, T( ?* a! U label-current
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6 {- V; M Q% a3 @9 e" E: W5 v set-default-shape turtles "car"$ g' @; X0 y: X8 ?/ A
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if (num-cars > count roads)7 K, v/ ?7 T8 y) X( P2 W
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user-message (word "There are too many cars for the amount of " t' [) A& M. A7 E
"road. Either increase the amount of roads "2 \# @2 V* ~4 J; z0 s( p
"by increasing the GRID-SIZE-X or "9 X( }" E1 i' J% \- c) P
"GRID-SIZE-Y sliders, or decrease the "2 r5 I/ z! J: I" z, H- j6 W9 a# |" }
"number of cars by lowering the NUMBER slider.\n"
& y2 E U V/ Y, l$ j" S "The setup has stopped.")
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$ q8 E0 k" O9 [% M ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; V0 \# {/ ?, D$ {$ L! v
crt num-cars
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6 v1 k6 }0 z* i# g4 o0 ^ setup-cars1 t- {3 B0 T- O( K' F+ [
set-car-color* ~, o! h! _( j8 D8 C- L
record-data
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;; give the turtles an initial speed8 i ?# d( O8 A) [
ask turtles [ set-car-speed ]4 C) e4 R+ J9 e! u& o9 H0 J
! x% \( t4 ?, [: {7 E; I( m3 q4 Y reset-ticks
2 e: X. ?" u) Q4 Pend! n; h/ I* H) @) t
0 l6 H% D! F2 ~5 |- r8 d;; Initialize the global variables to appropriate values7 A! r2 m7 H, g' ]) K4 R
to setup-globals
8 f _) X# s& A9 v% s set current-light nobody ;; just for now, since there are no lights yet& r% }% `' I! D3 z7 F8 Z
set phase 0
: x/ k1 f: ^- { set num-cars-stopped 0
- [4 q' e2 h% u2 R- e- b set grid-x-inc world-width / grid-size-x
: {' W x- \) i1 U& V# A7 W set grid-y-inc world-height / grid-size-y+ w& U) ~& m' e O" h5 M
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
e: N3 l1 |# _/ Q0 K/ d set acceleration 0.099
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+ B+ y. Z, Q8 G; O6 N; Q: D;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) f6 Y- T8 q" }/ k0 w
;; and initialize the traffic lights to one setting& U$ U4 f) ~+ l2 g7 V" i* |/ e
to setup-patches0 Z/ v$ Y4 ?7 |5 G8 l
;; initialize the patch-owned variables and color the patches to a base-color
9 f) ]# }) E4 k) J/ ~' n. b ask patches
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% O% [* s, H; N3 {# E% N set intersection? false d* Y6 X* t0 @3 G/ U
set auto? false0 O# j. H& }, Q
set green-light-up? true
K( V: k6 b4 Q& ` ~; Y. d set my-row -1
7 d% p Z- T8 W# f set my-column -1
) X3 e8 m5 w% `; u% r' v3 ~4 n- ?% x set my-phase -1
* o) H% Z7 k* q; M& T8 s& ~6 T# ~ set pcolor brown + 3
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* J. P& g8 j* t# u$ V% w( L. \ ;; initialize the global variables that hold patch agentsets; p/ y5 I! A. y3 g3 l* O5 }; l
set roads patches with% h6 X' }4 ]7 Y3 c2 W0 w) u7 A
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ {( p8 _! l& b' {' D! i
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 @. N3 o8 l: }- }; j
set intersections roads with
4 }9 d* a0 W5 G7 I& n* A" N/ p6 b8 d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and6 ^) w: H" B% [6 M
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 u# X4 E8 V' b: A7 n
e5 q/ J& G* n ask roads [ set pcolor white ]
$ s3 S8 o. C: j4 m9 t7 _3 D setup-intersections# f: b7 e6 T4 d$ ^/ Q; @+ a* S. M
end0 n) K i( K# Z- b d! r" s
其中定义道路的句子,如下所示,是什么意思啊?% z) L/ n6 ?# e! b( \9 Y
set roads patches with/ u1 H+ Z6 A. ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; F! l3 a5 `6 N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& b1 ?: l$ B( I
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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