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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。6 e1 M+ f4 f% L+ d* C' B" V0 ]
netlogo自带的social science--traffic grid这一例子当中,: a. N9 V U$ y2 G% n+ [) p
globals
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/ P$ }) b: _5 h grid-x-inc ;; the amount of patches in between two roads in the x direction4 f5 j% E6 X) l6 O* [8 ?* U+ W
grid-y-inc ;; the amount of patches in between two roads in the y direction
6 ~, w" }# k; A! N* u1 ? acceleration ;; the constant that controls how much a car speeds up or slows down by if
% P4 H& R# n1 g1 T! [ ;; it is to accelerate or decelerate' c3 }% q0 `6 S* y: [# y0 U
phase ;; keeps track of the phase
: ]) V2 E3 g; J4 h( a num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ j+ J$ z1 F0 |5 n5 U- Y current-light ;; the currently selected light
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- z8 w& ?% G$ w4 E6 C. ?( K9 T ;; patch agentsets% O; W" G2 `/ k. R. M- w: p
intersections ;; agentset containing the patches that are intersections
3 _% y& |* a; S9 q& W roads ;; agentset containing the patches that are roads% _8 g u) S9 G. C* q
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/ ^$ w6 B. z o/ Nturtles-own
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4 r% Y( e" F, e- E" m speed ;; the speed of the turtle
q6 {$ ?" N4 u0 t0 U up-car? ;; true if the turtle moves downwards and false if it moves to the right
: n9 v2 q$ I1 y wait-time ;; the amount of time since the last time a turtle has moved) k) N8 i$ [3 Z1 I) d" b( Q' R
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patches-own, ~8 R& h2 H( j V; B+ X9 {0 z
[
! H6 H1 g1 f, n& C' c2 D! J intersection? ;; true if the patch is at the intersection of two roads- \& z* `" `9 d; E3 X' Z
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
! e" a3 ]: H6 Z/ d+ I. g, q ;; false for a non-intersection patches.
+ F- Y: c% Q( `$ g% ?7 }$ [ my-row ;; the row of the intersection counting from the upper left corner of the1 b/ R$ ?; w* r ?* ]
;; world. -1 for non-intersection patches.' Z/ H8 P" ]5 b' u: s& z
my-column ;; the column of the intersection counting from the upper left corner of the
4 z1 u0 {2 a* x( l( V6 B* f ;; world. -1 for non-intersection patches.- ]: Y4 b: l! y
my-phase ;; the phase for the intersection. -1 for non-intersection patches.7 t- ^2 G7 r" c1 z$ r" R; F
auto? ;; whether or not this intersection will switch automatically.# @, C; A0 w! X6 C% ]9 R
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
6 s% K0 ? y& u, A" I& y' W;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.2 O6 r5 T' J1 O! H
;; Create num-cars of turtles if there are enough road patches for one turtle to! _: Q; {' q( ~/ W( @
;; be created per road patch. Set up the plots.
5 w9 i7 i2 O E5 Ato setup- N" R, M* L3 v2 n6 b7 U2 z3 F/ F
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setup-globals; Z1 y9 _/ ~; x X* B! R
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;; First we ask the patches to draw themselves and set up a few variables/ K7 b" D2 c, H
setup-patches
6 f. }' ]* Y1 e3 Z$ _ make-current one-of intersections
! F; ? S( D9 A. X& { label-current7 q9 Y: C4 P y6 z6 i$ {) c) L1 R" M
0 l. J8 b- L, g6 M3 w3 P# ]0 X set-default-shape turtles "car"
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if (num-cars > count roads)/ g+ f' F9 u% W; O O- D8 q
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user-message (word "There are too many cars for the amount of "9 e# e! d/ K: J* Z- R! t' Q
"road. Either increase the amount of roads " B1 G' t3 Q$ s& t" W# S
"by increasing the GRID-SIZE-X or "
1 v5 O, g4 W/ | "GRID-SIZE-Y sliders, or decrease the "
; U" C- i7 @2 k @$ j: J4 k) G "number of cars by lowering the NUMBER slider.\n"
& x; ~; a' g$ r1 ?: _! u "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( v& z/ n; s5 ]" z1 r5 B, ~" b crt num-cars) u- M% }2 s& l& W. _
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setup-cars
5 ~$ R0 j0 K5 ^ set-car-color
z4 `6 N: k2 s0 p$ t record-data3 F5 a2 g8 `4 O
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;; give the turtles an initial speed
4 H; t4 U9 ] |! M/ b ask turtles [ set-car-speed ]
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reset-ticks2 V& c: x0 m+ \- G$ [# D0 k" A
end* ]5 l* y6 P& V) C6 q7 i
. T; ~0 S& J3 ?;; Initialize the global variables to appropriate values
+ z" }" f) x4 u R0 Uto setup-globals
5 |6 \. A( `! W/ M; R set current-light nobody ;; just for now, since there are no lights yet$ E: i+ u( k% Q- r4 X- T4 E
set phase 0
: i: T9 a, e, V8 w% l' E set num-cars-stopped 0
7 b1 u* p: a( s' m set grid-x-inc world-width / grid-size-x M% L1 f0 c0 k' i# a6 z @$ T! T
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- |" A! T: B! V7 l5 |0 A
set acceleration 0.0991 d1 ?- |" H5 c7 p4 h$ I
end
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v0 N( O& X/ v7 B; M- W* \( F;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 E- p: g9 a0 H" a/ P5 r% S! U! y;; and initialize the traffic lights to one setting
4 |; h O/ a. D; v% ~/ r6 j8 Zto setup-patches
3 e; \3 M5 V# h; {; ` k8 ] ;; initialize the patch-owned variables and color the patches to a base-color
# |, w: M& U8 h& U ask patches
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set intersection? false
+ c, A4 q+ _; e; X. d/ |; x0 ` set auto? false1 k7 `( \$ C( _& a+ q$ I: ^' q0 ]9 g
set green-light-up? true
/ p0 u5 C& z; I2 z set my-row -19 q0 i; z) B0 f7 R6 e" D
set my-column -17 L) g% K2 Q) Q. S9 f
set my-phase -1& p1 p6 F/ r1 F; k2 t6 D( F
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
7 f" R/ w! f; K+ e; O& T set roads patches with! P: ~- B6 b5 W0 c* ]% N
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 o1 E: J1 A6 e- S$ j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 _, t& A* ^6 ~
set intersections roads with1 n" O! h& s8 Q. c5 g# [( @, ?7 W( q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. U3 P; |/ W( u3 ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
& F G; {5 T; l1 q2 M0 U B 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?
6 H% B: `, I7 m' M% c set roads patches with
3 K3 Y. Q0 _- D& _6 X! U [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 { j- U; `' i5 K+ [9 @! O s7 { (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 H0 M- X; H) J, D s2 ]* Y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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