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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。8 ^) Z0 \+ Q3 m1 d) O
netlogo自带的social science--traffic grid这一例子当中,: j" C4 N1 v/ ^- ?9 b
globals2 ]# W( p# h+ D; t
[
2 r* ?- ~% K" ~7 p+ i grid-x-inc ;; the amount of patches in between two roads in the x direction: Q/ f. f: p" L7 ]8 l5 u
grid-y-inc ;; the amount of patches in between two roads in the y direction' Q% O3 F5 e( b: W, F7 S7 C4 V
acceleration ;; the constant that controls how much a car speeds up or slows down by if5 ^. r2 m3 s/ W0 i/ b/ n
;; it is to accelerate or decelerate
" D1 t9 T/ ?3 x) W7 a phase ;; keeps track of the phase& P, K& C7 b7 E2 r% t
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
+ Q3 Y# e; A, m( \ current-light ;; the currently selected light
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+ z4 F4 E+ W. L2 G1 ]; f, { ;; patch agentsets, G2 u' g/ U m; o% w& a
intersections ;; agentset containing the patches that are intersections" j4 ?$ o/ X2 Y4 j0 L
roads ;; agentset containing the patches that are roads' r9 D9 `& g6 W1 [+ n3 f r$ j
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9 w6 V8 Z6 W: z1 V& x' R) k+ wturtles-own& i r' T+ ^& o( C
[1 H) n; f$ C; i W: V# ^% {
speed ;; the speed of the turtle" ?3 u, X0 N2 F9 e1 P2 |9 n' Q
up-car? ;; true if the turtle moves downwards and false if it moves to the right2 B2 ^9 ~3 c& P% |- e$ B
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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: I7 K9 n, d9 G* d2 Y intersection? ;; true if the patch is at the intersection of two roads; A# E2 S" n+ ]7 c9 z8 l& I
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ Q- Y# k- ^/ R6 T ;; false for a non-intersection patches.5 c4 o9 {; a# O6 P. B' Y
my-row ;; the row of the intersection counting from the upper left corner of the1 n' K+ Q7 t/ }: N9 K( U9 o+ R- ^
;; world. -1 for non-intersection patches.* t1 q. q% U3 R7 R, E8 C, S
my-column ;; the column of the intersection counting from the upper left corner of the8 {3 U6 ^# f9 h' n
;; world. -1 for non-intersection patches.
0 o6 O" w; \) ?5 W my-phase ;; the phase for the intersection. -1 for non-intersection patches.7 K, {) J5 H, w# ?+ d
auto? ;; whether or not this intersection will switch automatically.9 B U9 i! S, X6 m$ e* }
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;8 V( `! e$ P' R& z5 m- s
;; Setup Procedures ;;5 C, p* t0 }8 m1 [* J
;;;;;;;;;;;;;;;;;;;;;;6 L$ `% u: J, r; ~
# v% v* D9 S# M! y" ]
;; Initialize the display by giving the global and patch variables initial values.8 r f' K: k+ A6 [" v$ B- u
;; Create num-cars of turtles if there are enough road patches for one turtle to% I: L* Q2 m! X0 P0 N2 E
;; be created per road patch. Set up the plots.
$ m& {# M0 P& [' }. U% tto setup% ]1 F8 c$ \+ G# X" B5 V% G" C7 x
ca
( Q' ^, f8 j3 V' y0 |* } setup-globals9 k" B3 e9 [% z- m) k( X
+ {7 d0 c& O" q" m ;; First we ask the patches to draw themselves and set up a few variables
3 h* k! L* w; b' w setup-patches
6 x- @! Y* o+ r make-current one-of intersections
( Q+ c, g: r4 o5 ~) i4 ^2 n l label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)4 V5 F. K; R- z" {* C
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user-message (word "There are too many cars for the amount of "2 [" @+ K$ o, j4 `- z7 {# K7 ~
"road. Either increase the amount of roads "
# V& X4 }* q7 ]% h5 \' e "by increasing the GRID-SIZE-X or "
2 R. |! M8 k( ]; |8 t6 Z "GRID-SIZE-Y sliders, or decrease the "
7 q7 h6 q$ X6 d "number of cars by lowering the NUMBER slider.\n"- m) n2 M& U8 H
"The setup has stopped.")9 h$ D4 B, g) s: q+ V3 F8 F
stop) u: @( M* j' i) O1 y. \: N7 b
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- {4 m% f6 I4 Z! ? ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ i7 W6 b4 H' A, l6 j& r! B
crt num-cars
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setup-cars+ e3 P- p0 T7 b& G5 i5 l7 W
set-car-color
4 {. ^- @6 @+ ~& v3 u( K* x record-data. J9 [( T5 {* N5 `+ ~6 p, V
]
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;; give the turtles an initial speed9 E7 c' G1 s1 i: j% A4 w/ L2 E
ask turtles [ set-car-speed ]9 k1 G b! D! i; w$ {: Z
! P3 a8 [# I! A/ B, z reset-ticks
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;; Initialize the global variables to appropriate values# {: k( A: d( M$ E3 r& P2 N$ p
to setup-globals3 ^, K+ U' {* U) Z
set current-light nobody ;; just for now, since there are no lights yet; { a! l U" G$ h; D7 D! t& Y: V
set phase 0
+ A) g0 }7 N1 ? set num-cars-stopped 0
+ F; _& ~4 E5 ` d" ] set grid-x-inc world-width / grid-size-x: c! X* n% C5 C
set grid-y-inc world-height / grid-size-y% a5 C) j* W" g. z, `: ~1 R
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary1 F$ q) ~5 |/ o$ R% R! g" I& ]# u
set acceleration 0.099- P3 \2 X3 z0 `3 C* g. u* ^' p
end$ ~" C- ~4 x1 y1 V
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% b& `3 j9 q1 M( I7 `;; and initialize the traffic lights to one setting1 u. r; _2 @% u( w8 u
to setup-patches
$ O7 A% S: y) z0 u) T ;; initialize the patch-owned variables and color the patches to a base-color
! G" n4 @" k6 L) U! ]3 E ask patches" w j- F$ u u- c9 O6 d/ Q2 i
[
& K1 \, D- b2 ~* X2 Q# K) g) G set intersection? false
! y2 e9 _7 u: ~6 W: \. I8 m set auto? false$ I; M& w" t. D& b4 r! ]- k. S3 o/ x
set green-light-up? true
[# p& n/ C( ]& g2 H' D! c: r set my-row -1- g4 B. x5 s5 V! E" W0 F. F
set my-column -1' K- F$ k/ [, a. E; \+ H
set my-phase -1
, Y' c0 Y( O* e: V h6 K9 a) | set pcolor brown + 3 q: X8 z" ~8 ^0 R2 b `* ?* n. _
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4 S2 S0 J7 H2 l# Y* ^( c ;; initialize the global variables that hold patch agentsets
! w. ]- h) D! F9 z set roads patches with. d- y1 @) }/ x0 T
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 |+ s) i) |5 }8 l3 ^9 n1 l0 z4 w
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( G/ {5 g$ H9 ^
set intersections roads with& t. o; X# P9 F7 G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; W: W+ M, }) X' l( M: {7 N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( x: h" [- d0 i) }5 p% t
6 u* `2 U; M! p) c ask roads [ set pcolor white ]8 S) a/ E# S" _( B" \- o X3 k
setup-intersections$ p6 ]9 U4 C6 X/ v' ~& h3 a! f6 H% a
end
$ [# d" T7 x6 F6 v$ s& Q- G. Q其中定义道路的句子,如下所示,是什么意思啊?
8 M1 ~, n3 u' p set roads patches with4 \& a6 I6 S7 ^% n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ n! I, \3 r" w3 w7 Y2 E( k1 n (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" H% w3 L1 R# ?, t. X" z# Z$ O
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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