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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。
+ Y) {5 H$ H" p5 B$ P& D8 fnetlogo自带的social science--traffic grid这一例子当中,( A3 u& n0 @1 B, q
globals
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1 E f6 G E9 O; A4 |" T1 u8 T% D7 g grid-x-inc ;; the amount of patches in between two roads in the x direction
, B1 f9 n6 Z) i, q6 E. y grid-y-inc ;; the amount of patches in between two roads in the y direction" n, t* D+ S! V+ t7 Y3 ?9 Y( P+ G
acceleration ;; the constant that controls how much a car speeds up or slows down by if, r; \: W' G& J
;; it is to accelerate or decelerate/ c9 d' J5 F$ F
phase ;; keeps track of the phase0 i6 u$ R, T0 k
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure. d+ N1 K, e' @% _0 U1 e- e6 O
current-light ;; the currently selected light3 \ X) j g! {5 ^% s- v$ p; t- n
; l0 j. W, {7 r, S' G5 j ;; patch agentsets, }9 f A" y' J' d4 e# e6 G
intersections ;; agentset containing the patches that are intersections1 [8 _ O0 K8 ^# |) _% ~' h4 P
roads ;; agentset containing the patches that are roads9 h. G# X- ], L: _3 Y
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turtles-own
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/ {5 g, P- u# v% V- u speed ;; the speed of the turtle- f! w& D# g7 {' @
up-car? ;; true if the turtle moves downwards and false if it moves to the right
& @1 h8 N: ]0 C" W& @# o$ e wait-time ;; the amount of time since the last time a turtle has moved
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/ C9 }+ r6 c6 y( A' X* P5 |/ Mpatches-own2 z. E/ [+ Y% {. V# K9 P# v- c, I9 {
[
$ d; O% ^/ z0 G. ], B: I intersection? ;; true if the patch is at the intersection of two roads
( Z" \$ I4 G I7 y) b9 D green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ |! T1 |* s! b! I4 @ ;; false for a non-intersection patches.
2 ]( N0 N# @8 W. [ my-row ;; the row of the intersection counting from the upper left corner of the
& z4 a( P* w( w5 R% Q/ ~5 R( C ;; world. -1 for non-intersection patches.) @" \& _7 F) {0 G
my-column ;; the column of the intersection counting from the upper left corner of the# J; Q$ v: u! j V* |# |) f \
;; world. -1 for non-intersection patches.6 Y1 Q! ?1 K8 m' j
my-phase ;; the phase for the intersection. -1 for non-intersection patches." h2 k9 g& ] K2 r2 K5 F/ a
auto? ;; whether or not this intersection will switch automatically.
* I- H1 P7 E3 ~# y( t2 l( c ;; false for non-intersection patches.9 \/ ?+ ` k7 I9 T( X r
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;;;;;;;;;;;;;;;;;;;;;;, G, Q/ G8 ~! \, P2 w* i, F k
;; Setup Procedures ;;! H: }8 p' @+ ?/ R# N* |$ r
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
5 m& ~2 J4 Q5 i0 ?4 f7 M& K;; Create num-cars of turtles if there are enough road patches for one turtle to
+ P b4 I. U4 j0 ?& x# g h;; be created per road patch. Set up the plots.
) d9 v; i7 L+ r _: I1 J! ?8 @: K* Y2 ?to setup, I6 s0 N& g" W$ x: E0 n% B8 ?- t
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setup-globals9 j. P' R! ?* r9 A8 f7 u0 H# u
- F1 j1 M9 b! E8 ^$ U ;; First we ask the patches to draw themselves and set up a few variables8 I4 i1 D) U: B& o
setup-patches8 h+ I0 v0 y, V/ j6 @1 c
make-current one-of intersections
/ Y4 c) W% \ a. f3 t6 H label-current
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set-default-shape turtles "car"
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: L2 S% \) h3 ~8 \' z+ n8 N if (num-cars > count roads)' c7 ^% l9 \) g* E+ d
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user-message (word "There are too many cars for the amount of "- |/ ~1 K2 K7 w1 H7 ~
"road. Either increase the amount of roads "
0 m( V5 `9 c. @ "by increasing the GRID-SIZE-X or "
$ X6 `( k" Q/ M8 @# ] "GRID-SIZE-Y sliders, or decrease the "& ^' P& h) X3 _1 F% s
"number of cars by lowering the NUMBER slider.\n"8 i) Y; _0 E5 G- a# n$ e
"The setup has stopped.")9 V9 z4 d+ w/ P: [
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( w6 I- p7 q& L* w; E+ Q crt num-cars
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& M3 E, s7 X9 H7 i# ]% h% q* o% P setup-cars
+ F+ A- s. m% k) y% r set-car-color
r2 f" z6 _& w3 j2 I record-data
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" ^0 y' e. }( i+ | ;; give the turtles an initial speed: B" w9 Y5 y; K F, b4 `: n
ask turtles [ set-car-speed ]
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reset-ticks) g1 z0 O7 W' E( d0 D* d
end
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( b1 _9 C- R% o2 J+ `;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet. {! S' V$ f1 O8 M7 f! g
set phase 0
7 F* w4 B9 G2 w7 M H0 w9 a/ V set num-cars-stopped 0
; G: ~. ^' v0 X, m- C2 \ set grid-x-inc world-width / grid-size-x9 I P: s! F7 \9 h6 w
set grid-y-inc world-height / grid-size-y |6 x. @0 a; H
% _% _- Y6 L8 ]9 ^& K+ V) K0 i; u ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 y0 `" Y% q }% C0 ~
set acceleration 0.099
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& O+ R; @3 n y1 a/ P A* J9 L;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' y+ f! s# E% x( |( E;; and initialize the traffic lights to one setting
( z I) v' E6 |3 Q+ ?% p% Uto setup-patches i8 p1 j3 ~6 |: ^
;; initialize the patch-owned variables and color the patches to a base-color* y0 k- a3 q Z) |- ^0 g
ask patches
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" I$ P! q4 X T! b5 |, N0 v set intersection? false
, O4 ?& ?3 V! n3 n% C: r- F( x7 v; h set auto? false0 i4 o* s9 W$ ]* l2 ^& ?
set green-light-up? true
6 Q* ^" G8 J7 f( K" ?( k set my-row -1
( A: L$ b C! W0 h" R: p set my-column -1% I6 F5 y8 a$ }& Y
set my-phase -1
+ [ y3 G5 v- \' P$ I/ i set pcolor brown + 30 F: W6 K4 {1 a
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;; initialize the global variables that hold patch agentsets
4 x, \8 _& ^( H1 w' N% B2 Z set roads patches with
( X4 }+ K; E! e; V [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ M5 h& h3 \& O8 h (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ l6 \$ r* ]8 H% l, i; T set intersections roads with: }! u' _# M8 ]1 p; z5 `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' t, P3 D- W! Q3 g$ i( x (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end! ^' C, C A9 w2 y' I
其中定义道路的句子,如下所示,是什么意思啊?" ?6 e& F5 L; l: o: k8 I/ ]* e5 T
set roads patches with
, j: p! w9 c8 Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
R" J, _" R& @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ @* j% g. K; c; u3 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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