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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。
/ j9 [3 M: \4 b7 A6 v: s; }netlogo自带的social science--traffic grid这一例子当中,, ^; G, a2 O- r$ v, `' f
globals6 O) O: s3 Y; g% B6 X6 _& O; z
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, y: ?. w$ P1 h' e* x: j& ?, c( q grid-x-inc ;; the amount of patches in between two roads in the x direction
1 s- Z7 C3 U$ {* W' { grid-y-inc ;; the amount of patches in between two roads in the y direction
* l4 v$ U0 ^7 C4 D acceleration ;; the constant that controls how much a car speeds up or slows down by if7 U* ^: p3 J, x! j* r
;; it is to accelerate or decelerate8 w, o6 Q4 t) T! f% M
phase ;; keeps track of the phase ~( }. u2 P* ^, T1 V
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
D7 B! Z9 O" Y) c2 Q6 J current-light ;; the currently selected light& S1 K* }% D0 U, J% U6 l. k
/ j1 A, ^5 ^* [7 @% J3 I7 f2 P ;; patch agentsets
1 @6 [ Z! t, Z* L+ w: G' D' Q intersections ;; agentset containing the patches that are intersections9 Y2 N7 Q* I3 `7 o+ V) a3 E9 _# n
roads ;; agentset containing the patches that are roads
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0 i% L, s, { e$ ^6 Q2 U8 yturtles-own
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speed ;; the speed of the turtle
' l2 {& c" d# w2 {, j up-car? ;; true if the turtle moves downwards and false if it moves to the right
- w. f& X% @. |* ? |$ x wait-time ;; the amount of time since the last time a turtle has moved
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4 J, b4 y5 ]$ Z2 ]- Q' opatches-own
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intersection? ;; true if the patch is at the intersection of two roads
& n) N2 Z6 x9 [; n$ ? }6 q green-light-up? ;; true if the green light is above the intersection. otherwise, false.. D) A/ e, K; ?4 \2 j* N. t6 U9 T2 T
;; false for a non-intersection patches.& ~; Z) X" k, e5 p6 J2 q
my-row ;; the row of the intersection counting from the upper left corner of the
4 I& g' c0 R/ O, h {! y. G% j ;; world. -1 for non-intersection patches.
' f9 Q% B1 S9 `+ k5 k( F' H1 c my-column ;; the column of the intersection counting from the upper left corner of the
3 W6 O- q& z% `% Q0 @, ~ ;; world. -1 for non-intersection patches.
' ^. I% S: ?2 x% y* M. ]2 D my-phase ;; the phase for the intersection. -1 for non-intersection patches.
' j2 }: ^9 g; v8 _+ N% j auto? ;; whether or not this intersection will switch automatically.
" D6 u. a) j$ ~4 w1 ?7 d! E3 O1 X' M) f) l ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;$ S( M2 ?3 ]1 u! ?! t( U3 U
;; Setup Procedures ;;8 F% m4 g& F$ R5 }8 j: v$ ~3 j7 L
;;;;;;;;;;;;;;;;;;;;;;0 u7 L0 A4 v' M% A0 B
& q. k5 U6 `0 ~ Q J, ^2 ~5 {;; Initialize the display by giving the global and patch variables initial values.
3 H2 w; I8 u0 y# w" `8 h0 t;; Create num-cars of turtles if there are enough road patches for one turtle to% C$ w. Z' L8 F6 p, ^" d; {3 m
;; be created per road patch. Set up the plots.
2 }. V' ?& U$ x1 l( } D5 Hto setup8 j* J# S0 `6 |2 c
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setup-globals
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3 J# j7 ~! @, P7 W1 ?5 R) {+ W ;; First we ask the patches to draw themselves and set up a few variables( E+ D! \2 x6 f$ h# g( K+ {
setup-patches
* M) Y. Z4 L, l/ J S. o make-current one-of intersections
5 T3 q3 ?1 b: S1 ], K label-current
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# y7 X+ _4 |; P8 e2 v set-default-shape turtles "car"& b) d, y; J1 C' @6 U$ E
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if (num-cars > count roads); W, J1 Z2 d6 T$ {- G
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3 e# h: S/ f6 K& m user-message (word "There are too many cars for the amount of "
& k( g3 F9 e% A y "road. Either increase the amount of roads "5 g0 ]1 o, X0 u4 V7 V" n3 A
"by increasing the GRID-SIZE-X or "
( L7 w, a" Q, _' X$ T; C4 p; H "GRID-SIZE-Y sliders, or decrease the "
9 J$ z7 M1 |+ ]% P; w# m& e2 u "number of cars by lowering the NUMBER slider.\n"% g0 v8 H$ P% O: H- r, M
"The setup has stopped.")/ m4 m5 O% D- C: o a
stop* H$ o; y( d1 z
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 f4 G- T" }/ @, C
crt num-cars: ^* x" K6 M3 o* |6 C9 i
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setup-cars
6 P1 o7 u- ]( {8 c- i$ y: ` set-car-color( l0 K( U3 f/ }1 r3 M0 k1 ^( c
record-data R- L M, ]9 F- Q0 @4 f9 M# t
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0 M- M) X6 K, ]3 J- k$ {6 k ;; give the turtles an initial speed& _" y( Y Y+ d: L. c
ask turtles [ set-car-speed ]
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reset-ticks ^0 V, M4 r* K0 h7 |% N8 A
end
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;; Initialize the global variables to appropriate values& k5 R: s3 | |; }6 H
to setup-globals5 m, ^+ U r) Y2 j. U
set current-light nobody ;; just for now, since there are no lights yet1 I* ~$ v1 W, a P+ h
set phase 0
. w" r% I8 m+ F1 Y; I set num-cars-stopped 0
3 }. p" N% Z: C+ P, D O set grid-x-inc world-width / grid-size-x
; D3 T! T6 x# l3 }. g1 L; P 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
6 b$ P2 K8 Y9 l/ \, H; B set acceleration 0.099! ?+ s. {- }: C9 I* ?
end9 A* r' g6 x, f9 q, W
$ z- u+ X4 Z+ X( D" L;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 y2 P6 M" f% A! t, e;; and initialize the traffic lights to one setting: R* A8 G9 y8 I: Q) p( y& K# \
to setup-patches$ _6 {' \5 Q5 s c/ [' P9 m, v
;; initialize the patch-owned variables and color the patches to a base-color
6 d' j, ?1 Y! ^ ask patches- ^9 o W3 M! o5 O4 @; _
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. \0 v. w6 n" A1 S1 @ D set intersection? false. b8 U/ E Y: o
set auto? false* {- @7 [) ] V( T3 t' b
set green-light-up? true
! m( h7 H* }& }4 x% `+ @$ h3 w( T set my-row -1
4 T; g& k9 V, B! s2 k& e set my-column -1
& r0 z% l4 y. Y4 V4 {" y1 E. [ set my-phase -11 O/ p. Y9 p& Z; [$ Q6 k6 j
set pcolor brown + 37 ]" X5 k% [6 e8 D5 Q8 A0 p
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;; initialize the global variables that hold patch agentsets
2 ^" M* G1 N$ R3 K- p' a set roads patches with: D5 q8 ?4 ?9 C2 I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 ~" _8 B0 m# W; H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ l/ {( ]0 k# G% l# {. { set intersections roads with' O, v$ m1 c7 _. ]! T3 X5 h' L" m
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
" N& v9 l. `9 L" n (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 I+ Z; p. C0 d6 ^6 t
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ask roads [ set pcolor white ]3 H' {$ _6 a# Z s% r# F
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?; r: d) c. D; z$ T: O' a, p) G
set roads patches with7 T$ C& q+ A) I4 i8 t
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 h& ?# K$ J, Q* m- T+ Q3 X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ Z. V5 a, D/ q5 J p
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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