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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。
0 N5 D' b: m$ I7 pnetlogo自带的social science--traffic grid这一例子当中,* O6 \3 F5 P" T2 z; ]( X9 x$ N
globals' s0 G* f, h [. O
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* t8 X) A' p% K5 [ U+ d1 B grid-x-inc ;; the amount of patches in between two roads in the x direction
6 o+ \* O$ k O: |- W* N& v1 x; i grid-y-inc ;; the amount of patches in between two roads in the y direction
6 G9 L3 e. @7 y9 d5 W( o8 i acceleration ;; the constant that controls how much a car speeds up or slows down by if4 Y$ j3 Q _& X. U0 F2 t
;; it is to accelerate or decelerate; N4 @% J2 k, Y
phase ;; keeps track of the phase* u4 P* d1 g9 M% S$ h; L2 G- i% G
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure5 l4 Z* L! r% q/ @" V
current-light ;; the currently selected light; [# X2 e0 G" M. F
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;; patch agentsets3 R [, I3 o# e
intersections ;; agentset containing the patches that are intersections/ A; l- a G3 K5 ]% q
roads ;; agentset containing the patches that are roads
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3 F: h. t3 }3 j" `( ^; A! ~3 S# `- {6 @turtles-own) G5 s$ c0 B: M# }
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8 T; F5 Y2 ]* {# e1 | speed ;; the speed of the turtle* I1 v0 T- y. F5 _- Y
up-car? ;; true if the turtle moves downwards and false if it moves to the right
4 p1 Z% \% N& ]; x" }% G wait-time ;; the amount of time since the last time a turtle has moved
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0 H0 z& L% l' Z0 @: L0 Q; V$ }patches-own9 ^: d/ m) v8 d( Y
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% F( V1 L4 f M0 N# p intersection? ;; true if the patch is at the intersection of two roads
: Z D5 J& ^: u+ U0 `( ` green-light-up? ;; true if the green light is above the intersection. otherwise, false.
; }( k( ^* Y) X/ y7 Q3 H ;; false for a non-intersection patches.* o, y1 f9 J+ g8 D( Z: C# q
my-row ;; the row of the intersection counting from the upper left corner of the
. [: {( l, R1 E7 H8 n* d+ x2 \ ;; world. -1 for non-intersection patches.
J. y) J& i9 M l+ B# c my-column ;; the column of the intersection counting from the upper left corner of the! K! a J1 E* o4 ~8 S9 z: G8 }5 O
;; world. -1 for non-intersection patches.$ N9 Z; i0 d! a
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
5 H( F2 V; n- N0 D4 @& h' c: K" A auto? ;; whether or not this intersection will switch automatically., q' g3 O, D7 o! ^
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;6 G% d9 T3 S9 a9 `3 ~/ n: z, C
;; Setup Procedures ;;
4 `4 Z' O H1 P8 `9 J2 m8 S# `;;;;;;;;;;;;;;;;;;;;;;
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: n: U: C" o6 Z! `;; Initialize the display by giving the global and patch variables initial values.; W) I3 o1 C/ ~' H3 m C
;; Create num-cars of turtles if there are enough road patches for one turtle to9 j/ V$ K1 t2 X v9 C( |# C) E
;; be created per road patch. Set up the plots.% h. D, _* x# }, W# h$ t# M
to setup$ ^! k2 s! U6 J7 J1 W6 c
ca
: w. `, F; |( }- C setup-globals6 O# A+ O1 e T/ ]' N* t5 p
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;; First we ask the patches to draw themselves and set up a few variables
1 N: B' P' t! ?4 Y+ q2 _$ r setup-patches
" b: q7 q' I1 a$ ~1 ] make-current one-of intersections
& t4 K/ e8 G$ Z4 T) H6 {( ` label-current! X6 N; W) |& ^ ~/ M
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set-default-shape turtles "car") h# ? F( j7 x( M1 q9 `! l8 X
0 ]0 B* ^9 u, t/ N. z' U2 E$ n if (num-cars > count roads)
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7 n3 c2 N) I1 B3 |. u/ K user-message (word "There are too many cars for the amount of ". p2 _7 E" P* p' P
"road. Either increase the amount of roads "
% Y# D1 I/ x! g% k3 f- B# f9 d "by increasing the GRID-SIZE-X or "9 @# m8 H) k; y, @) x8 e
"GRID-SIZE-Y sliders, or decrease the "! Q& w# @+ y0 W- u$ \
"number of cars by lowering the NUMBER slider.\n"* P! V$ _; }) \1 S" u5 U
"The setup has stopped.")
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8 T: _" J. t5 N6 R9 Y' ` ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: N( V+ J+ N# X' k. I* ]) M: P
crt num-cars
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setup-cars1 p0 P0 ]' z9 m# z/ a. D0 j
set-car-color( @4 H( i. [4 r; v8 H0 L7 T- W& u7 o
record-data
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|8 @1 p! b9 K$ [ ;; give the turtles an initial speed% Z$ k9 s6 q. \1 O' ^2 k
ask turtles [ set-car-speed ]
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reset-ticks
8 E" [& k7 Y& B1 _8 K }end; o. w6 ^; K9 E
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;; Initialize the global variables to appropriate values! I I& l. G' r/ l% t& p8 O F' ?! d
to setup-globals
. c2 a7 m7 H) P- Z6 Z9 u# s set current-light nobody ;; just for now, since there are no lights yet. Z& h- a% m- ]& k% n' u
set phase 0* A$ ]$ S" B) q" S9 t, z% W
set num-cars-stopped 0
1 B" X& g' o; U9 M5 N3 c1 e+ D2 r set grid-x-inc world-width / grid-size-x
5 `, t) w4 q& {1 K6 n; v5 s set grid-y-inc world-height / grid-size-y2 p) ]$ e' n: s% ]$ K
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 m1 a8 y- W' M4 C e
set acceleration 0.099
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0 v/ e/ q1 e1 T4 o, A* x$ y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
3 [. F1 d# y$ s, M5 |;; and initialize the traffic lights to one setting4 A% {( Q) Q5 D. E6 ~. w3 c' r( ?
to setup-patches' S& [/ v# v( s
;; initialize the patch-owned variables and color the patches to a base-color9 l3 J1 M% f7 w: [+ D; M
ask patches' O, _3 R7 P1 M+ b! B: `& V
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" N+ F$ `. F+ {" h, f5 m) T4 ] set intersection? false& F( V+ X& L! @, E0 R& K# [
set auto? false
1 E% Q7 z: c' @) x set green-light-up? true
7 w" E5 {. b: y5 d$ L set my-row -12 l3 m" f# a2 H" x; _
set my-column -14 |. I# V8 V1 y8 e3 K9 U
set my-phase -1
( ]. L$ r; F' |! F$ p set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
! y, Q% u6 `5 j8 l" X set roads patches with9 l/ t$ t4 a1 D$ O8 q" b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- Q4 O- J& w7 p( Z& j, S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ F6 t; t, |% G/ g+ s" G- ] set intersections roads with
u% B1 p r+ `! A& D8 _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) U! }) n- _6 s% A, N8 r! ~ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]' t8 w* r/ ?" W9 m; g! m* Z" {
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
! P) |" R: Z2 L! ^) K% i! C set roads patches with# d4 |* x" U) l; K' x( `0 N- y0 b9 B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 \) @/ ?, x @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 }% F! n9 W% {: u: u- L k; M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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