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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。+ G; ?# B) d6 N" O
netlogo自带的social science--traffic grid这一例子当中,$ [+ g: {) a( a) Z S
globals# a2 Y y0 }, n' i. C
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grid-x-inc ;; the amount of patches in between two roads in the x direction
5 W( g0 I1 ^* B5 k% q* D8 W; U' N grid-y-inc ;; the amount of patches in between two roads in the y direction
5 [/ ^2 B4 \9 g' _3 U acceleration ;; the constant that controls how much a car speeds up or slows down by if
; c+ D, S4 I( r9 a ;; it is to accelerate or decelerate3 l6 Q$ O2 K3 T% |- j) y, s" I8 g! d
phase ;; keeps track of the phase
9 y3 O5 i& u0 A* a* X+ n4 B3 p num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 s( S+ s! c# J e current-light ;; the currently selected light
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;; patch agentsets
8 Z# @$ A: K9 v intersections ;; agentset containing the patches that are intersections
0 {: d: ^6 v' v/ q% y3 G roads ;; agentset containing the patches that are roads/ b: l- V7 o l* H% z# ` S
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turtles-own6 [# I, }( a5 g6 P O- k
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speed ;; the speed of the turtle
+ T4 r$ \, E- A up-car? ;; true if the turtle moves downwards and false if it moves to the right
* l, n# X6 @ C# k9 \2 } wait-time ;; the amount of time since the last time a turtle has moved0 C+ J2 b7 U) j2 `5 S' W/ n
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads. c' Y+ t3 s$ z+ L+ `7 ^- k, @
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
9 ?/ T2 o; R) U) X1 t! z ;; false for a non-intersection patches. ~8 u$ ]: a& \
my-row ;; the row of the intersection counting from the upper left corner of the
+ K; `; J* R c! a! ?' R5 [ ;; world. -1 for non-intersection patches.
' p M P2 }/ `& ^( f my-column ;; the column of the intersection counting from the upper left corner of the7 Q' S5 a% k! R
;; world. -1 for non-intersection patches.+ p Y3 ?$ B6 a+ b
my-phase ;; the phase for the intersection. -1 for non-intersection patches." U; x. B) E9 Z% {3 z4 H' e
auto? ;; whether or not this intersection will switch automatically." u7 A0 Y2 k1 C" ]
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
% A; y! d( c) b;; Setup Procedures ;;! `( t6 N' [% @- N
;;;;;;;;;;;;;;;;;;;;;;# x- y0 i2 y; ~) C4 J/ s: X! ]0 c
. c: x' K# {! E/ z* u5 H) s;; Initialize the display by giving the global and patch variables initial values.
6 ^, n/ \. z* g$ [* T( L; w;; Create num-cars of turtles if there are enough road patches for one turtle to" G! K4 ^7 D+ }* ^% G
;; be created per road patch. Set up the plots.2 C' I9 \- B% |; G: W
to setup& ?5 L- U1 i c/ G6 H) B) f/ W
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables9 S- L' ^7 ]; y u
setup-patches
- {+ ?8 Q7 e' N1 q" H make-current one-of intersections/ ]! K. N! D2 S9 N: \
label-current" @7 a F) L$ ], k' d$ e
: C8 ~% f. ^1 R7 x set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
- j7 v% r" T& G" Q "road. Either increase the amount of roads "
a Y) w) m8 I: i "by increasing the GRID-SIZE-X or "$ m7 Z! \: [+ B2 y8 e+ c
"GRID-SIZE-Y sliders, or decrease the "" ?+ U" T) m- _6 U- x+ I
"number of cars by lowering the NUMBER slider.\n"
- ]; G0 w' i: F! h" r) `2 O+ u "The setup has stopped.")% ?" _5 J# h8 Z2 ~% {; c0 W
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 G. x' |, U5 Q5 v
crt num-cars
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( F1 c. R) Z8 }' m' b setup-cars7 c. p* o2 R7 f' Q8 I
set-car-color
4 t( S$ M7 D' t. \7 c P record-data
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;; give the turtles an initial speed
& Z- M E7 F6 a ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values! Z4 _5 I i3 p
to setup-globals
% E0 V! k# l+ M set current-light nobody ;; just for now, since there are no lights yet
2 c; \- s( b' k; ^# ]: W6 w2 n4 ` set phase 0: }+ j+ s- f- {' Q7 G& _, d* Z! G
set num-cars-stopped 05 G6 H. r1 w& B$ w+ j2 M. S+ Y, D
set grid-x-inc world-width / grid-size-x$ G6 \0 t1 b% w; A4 ?( w
set grid-y-inc world-height / grid-size-y8 w' A9 k9 I7 |/ L6 W
; b' O: U% T; R$ |, U+ h7 z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: w8 m t1 ^4 Q7 E! E" [
set acceleration 0.099# ]5 ^5 [* h$ m5 g8 Z
end
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4 F0 ]( I, y* C/ H ~;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ |( z1 \4 W6 F O* ]) F! c) h w
;; and initialize the traffic lights to one setting
+ Q; F8 Y# c. U# R6 \/ mto setup-patches) Z9 L2 i% A( S! d8 X0 |$ f
;; initialize the patch-owned variables and color the patches to a base-color w1 d) q$ Z; L' h
ask patches4 ^, V) F5 S# m6 ^ z9 X
[
7 G: L( C; i. e, X& [& H& j- q. n set intersection? false
' U1 ?5 c" Z0 R2 X9 A, Q1 C n- E set auto? false
9 [: L, M9 H$ S! N6 N$ E, T# M+ d( L set green-light-up? true
! ?7 {# r7 Q( _4 g" y3 L set my-row -10 a7 E' c8 T, ~* o
set my-column -1
- ^7 }/ E! X Y2 x8 W0 E! O# X% w! a set my-phase -1
( b. U, r5 O& e0 |( m6 j set pcolor brown + 39 V+ s5 D2 ]+ i" i0 H5 _: W, _
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;; initialize the global variables that hold patch agentsets+ ]) @ ?' Z/ U' X; r" `4 x, D
set roads patches with9 a7 H# f; ~/ d0 r% C$ x/ `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 Z( r* [0 y$ J; ]' ]6 y' i (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 X0 P& }# V- T" G; w" D! a set intersections roads with
4 A+ \# i7 V) F# i [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' j" x" h! }: ~5 G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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2 F% w* z5 ?: V% t3 q# s ask roads [ set pcolor white ]: ?& H' C5 j' V* Z2 K% R# N
setup-intersections
0 z6 z' Q. C4 O9 U0 h! F, p. _; L0 ?end
5 ]; U* z F# |其中定义道路的句子,如下所示,是什么意思啊?
m* b8 c2 d8 ]8 B; |; m- u( M set roads patches with
) h- ?. \, r" q+ @& H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 _6 D7 ?, g+ Z7 O
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& {% |, m8 P% b5 f+ M% W0 f
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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