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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。
5 U( P$ m' H _* A' [netlogo自带的social science--traffic grid这一例子当中,' P2 p$ {: K& z3 U8 |5 Z1 v+ v
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
+ N, n9 n1 T6 |$ E! H grid-y-inc ;; the amount of patches in between two roads in the y direction: ], _: [( [: z
acceleration ;; the constant that controls how much a car speeds up or slows down by if) Z; U: P! l/ {8 Q6 X3 F2 K ], ~# p
;; it is to accelerate or decelerate
% N; M' P* j0 p2 x1 R7 m+ I" ? phase ;; keeps track of the phase$ V1 B' Q0 u+ m3 ]8 O
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 w/ h" W- i1 L5 ?
current-light ;; the currently selected light
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1 |) z6 L/ O B ;; patch agentsets
3 a9 }' p( Q; l0 U intersections ;; agentset containing the patches that are intersections
) |+ c' P r# u roads ;; agentset containing the patches that are roads
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4 W6 f' q) M2 U: l0 P/ G/ ?, |turtles-own6 y. s) [, U% a$ k" s( b
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speed ;; the speed of the turtle# ?+ F' i2 d, l* t5 D9 x
up-car? ;; true if the turtle moves downwards and false if it moves to the right
% Z0 I% d; p, y wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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. j$ t0 u2 ]6 q% `& r6 ? intersection? ;; true if the patch is at the intersection of two roads
; m5 Q& ]/ e( F' K9 ~6 I; k& L green-light-up? ;; true if the green light is above the intersection. otherwise, false.
0 G, {1 w7 J3 n8 h- h6 r# @ ;; false for a non-intersection patches.2 E% N9 X Q& w/ p
my-row ;; the row of the intersection counting from the upper left corner of the
- @. I G2 m( w C- L. X ;; world. -1 for non-intersection patches.
: j8 b! u; r) D* m# O7 z my-column ;; the column of the intersection counting from the upper left corner of the
0 L3 D; ~- S, A8 E* R4 w* \8 \ ;; world. -1 for non-intersection patches.
' G1 w' m5 h+ W7 J" x my-phase ;; the phase for the intersection. -1 for non-intersection patches.7 a5 u) R) k! l2 g, f
auto? ;; whether or not this intersection will switch automatically.
3 H4 Y, i) A$ }: ^. T& v9 O ;; false for non-intersection patches.$ p4 e+ d9 W/ O1 B
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% Q7 ~% {: P8 ?* M' @;;;;;;;;;;;;;;;;;;;;;;7 Q g6 k p) J$ l! N% ]& m# t8 e
;; Setup Procedures ;;9 n4 [- r+ v: ~1 }% z# R8 A ]: V
;;;;;;;;;;;;;;;;;;;;;;
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1 e! \% x. k; t, y2 Y. D;; Initialize the display by giving the global and patch variables initial values.
: ` }) f8 o: [/ W/ `;; Create num-cars of turtles if there are enough road patches for one turtle to( J3 }" p; D2 V/ U7 c* T; a! f+ b% c" n+ `1 h
;; be created per road patch. Set up the plots.
3 g# ~9 q1 h* Y8 R6 t Rto setup
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8 b* l [! x+ ^8 k' F4 _ setup-globals6 p' s) }2 }- s& w4 R. Y
1 W+ s1 J0 C: Y E. s5 y ;; First we ask the patches to draw themselves and set up a few variables. G( A+ v5 n2 Y$ N2 K m
setup-patches! R& H; y# ]0 I6 |
make-current one-of intersections1 m, T: q, F0 [# b" P5 p% l
label-current8 N3 N. G0 K4 Y( f! ?+ D0 Q
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set-default-shape turtles "car"1 M4 n- N' c* J/ ~. U- P& o
1 L0 p7 y. J' K9 n- N+ Z! u- ` if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of ") {! F4 |. I ~" I# K# T8 {
"road. Either increase the amount of roads "5 N6 h0 }' C6 H( }- G
"by increasing the GRID-SIZE-X or "
' j' v" q# D5 ~# |0 L8 f "GRID-SIZE-Y sliders, or decrease the "8 i# f+ S+ w$ A
"number of cars by lowering the NUMBER slider.\n"
" Z$ l! R. y+ Z" V; x+ G4 I$ U "The setup has stopped.")0 T+ v- K) E5 v4 k% B6 Y2 F% F
stop% p& |: }( C5 \! J
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( ?* Z+ R* Y9 I. w% y+ Q* \ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! }7 x/ b8 W; \+ R3 @2 m% X
crt num-cars, O/ v% `3 i8 D+ S' M
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setup-cars
. I. R0 E) p/ M- w+ C set-car-color% d* O; h, _" |- S! i1 p# E/ D
record-data' F( `$ K a4 W6 H& w
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;; give the turtles an initial speed$ F0 L$ H0 f: T, s& P; I- A. J/ @
ask turtles [ set-car-speed ]
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3 h5 ]" `' i0 ]' Q reset-ticks, O- w/ e( D* ~+ b
end6 u) v) [8 n: I, @9 \9 w! M( s9 G8 S
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;; Initialize the global variables to appropriate values
5 N7 |% s W+ z$ L6 L- [8 jto setup-globals
. A+ t( B* L2 }# Z# \, e6 z( R set current-light nobody ;; just for now, since there are no lights yet* @6 r ]) M/ B' Y* Q& F
set phase 0# ^! }. K8 B; [$ v* Q! u
set num-cars-stopped 0
9 Z5 x, h; `9 W6 }+ ?9 G set grid-x-inc world-width / grid-size-x
0 h. ~5 I z- t, G1 n8 r set grid-y-inc world-height / grid-size-y1 s& F; | ?) q
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary- f; W, ]/ c) q& r9 Y0 H
set acceleration 0.0994 P: o% _8 ~1 t2 S* |
end
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8 X( d7 o# @- ^: U7 u. z# Y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# z$ r" ^4 O0 }2 \;; and initialize the traffic lights to one setting
5 R8 g _2 c, E$ B( J" Nto setup-patches
0 h3 F+ O1 v) @ ;; initialize the patch-owned variables and color the patches to a base-color
2 @+ s% W9 r0 Z: h ask patches
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% }, d, Q# |% F- {; L- F6 r set intersection? false
! f# ~2 T6 |2 G set auto? false3 j1 m/ K- ^' q" F
set green-light-up? true
' U+ G5 M6 t7 Z. m5 { set my-row -1
" k# g$ W5 ?9 M$ r2 Z: B8 B set my-column -1
3 n9 v3 r: L9 D' ]: G set my-phase -1
0 N2 Y; `0 I; ]) c' D% f set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
8 R. Y5 p( w6 y+ a set roads patches with
, I' q% k7 d/ Y- _1 L7 P [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ ?" j, ~( G* |" ^0 a
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 N& a2 c1 R5 W' A( g n
set intersections roads with+ a- j" ^% @. P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 x, ~& A* q6 ~' O u' U (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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2 D+ ~# _- h) j ask roads [ set pcolor white ]! o \+ {& v F+ G5 o
setup-intersections3 [, G8 v/ ?# [) S; s$ M0 T
end
+ u" P7 @% J$ ~( o5 n* d9 K# n其中定义道路的句子,如下所示,是什么意思啊?6 S: |$ ?' X* Z7 N5 B; |
set roads patches with
/ i, k; x7 H. @6 e- f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. h/ z; h; g4 M) V; Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 M: n9 A9 y- ?3 d# i
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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