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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。
; W2 Y& \$ S$ B! x0 Bnetlogo自带的social science--traffic grid这一例子当中,
; [& Q: Y9 C$ ~. Uglobals: V5 l6 y! E5 `- N
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; P0 T; c; I5 ?! a- f* r$ M: K, W grid-x-inc ;; the amount of patches in between two roads in the x direction
4 g5 x3 K6 a- d$ [ y: V+ T grid-y-inc ;; the amount of patches in between two roads in the y direction
4 r& G6 d0 I3 Y2 x+ ]- h M acceleration ;; the constant that controls how much a car speeds up or slows down by if0 \8 Q% u A& t/ G
;; it is to accelerate or decelerate+ ^. I1 W" z1 M$ s; A$ s1 m7 r# K$ D* P
phase ;; keeps track of the phase
3 b# B0 X' P0 ^7 N4 o) l9 b7 d9 n num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
3 \) l# {) v1 A5 T5 n+ | current-light ;; the currently selected light# q% A1 W# h p" d$ w/ ]! m
4 l m; ~$ t H$ O( J ;; patch agentsets4 q7 t5 g+ P" [5 S
intersections ;; agentset containing the patches that are intersections' v: Q, C4 E k% m6 C0 F4 r1 v% T
roads ;; agentset containing the patches that are roads z2 a0 |& z, F+ i0 G+ G( H
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turtles-own
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9 K, x3 @# C! {7 L; I5 J0 j speed ;; the speed of the turtle! d* K' N% H4 h/ X4 f
up-car? ;; true if the turtle moves downwards and false if it moves to the right
# K2 @! h: b- u& J j wait-time ;; the amount of time since the last time a turtle has moved6 S' k D; j, T. `4 q% d
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, j& R, c5 g2 h4 j" x5 @patches-own
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% |) E+ [' X" _2 q: j) y. U intersection? ;; true if the patch is at the intersection of two roads6 L0 ~) T4 f. a1 D8 j% S
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
3 w6 z/ ?9 b- V$ h3 r" I/ w% m p% l ;; false for a non-intersection patches.' j7 P1 H) | z4 P: E$ q
my-row ;; the row of the intersection counting from the upper left corner of the! l6 H$ U4 C% M. @* e
;; world. -1 for non-intersection patches.
/ G3 d$ M$ \7 X" I! h my-column ;; the column of the intersection counting from the upper left corner of the$ J/ {3 x0 a" E8 R# }2 h
;; world. -1 for non-intersection patches./ ~* J `: {6 C6 D/ w$ n
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( V. y# {& K. ]$ t% _) _( K/ N auto? ;; whether or not this intersection will switch automatically.; z5 B7 F1 O) o$ L5 V6 i
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;( L% d: B- N: E! Z3 S1 s; c
;; Setup Procedures ;;
$ _9 ~% R2 J0 h9 S! n4 b0 \2 B5 r: R1 D;;;;;;;;;;;;;;;;;;;;;;
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' o- U. o) t! P6 |3 d" e;; Initialize the display by giving the global and patch variables initial values.2 Z; a. i' f+ i6 y% l" u- U
;; Create num-cars of turtles if there are enough road patches for one turtle to8 h8 Y, ?; S8 C% O* H
;; be created per road patch. Set up the plots.& [: u' P5 K- q7 J5 }4 d' H1 X
to setup; V2 r& `$ z2 l7 t
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setup-globals4 P" r# v, ?9 Z- @, S5 ?- C
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;; First we ask the patches to draw themselves and set up a few variables2 L# g' T' S5 U" m0 n; O
setup-patches
$ Q! B/ I/ ]# Z' l" T make-current one-of intersections0 m P% a/ F N
label-current+ ?5 a& }" ?$ | a
. Z7 y; Y% N8 T! @ set-default-shape turtles "car"7 z" I- N- ^7 ^& v5 ^
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if (num-cars > count roads)
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: k: r5 [8 H; X; Y" ?+ k' z user-message (word "There are too many cars for the amount of ", |, ? R3 B" ~$ B! J' g7 i
"road. Either increase the amount of roads "' G/ e' c1 [9 M! }$ O
"by increasing the GRID-SIZE-X or "5 n$ z+ O- L% c3 W! U, ^
"GRID-SIZE-Y sliders, or decrease the "! X0 H1 g; F, l& J0 w
"number of cars by lowering the NUMBER slider.\n"1 f0 {. g% n) P/ q& E& O3 }
"The setup has stopped.")
/ C" O- C8 z4 L3 X4 X! s* \ stop
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$ Z9 g8 Q4 z/ s. t Q( V! ^ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" f) h; l' i, i$ B
crt num-cars
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setup-cars0 K1 k* M- ?2 I, Z% n8 A9 x1 w$ b
set-car-color! V% D/ j% z5 c `. K+ _# c1 E$ k
record-data
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+ d! h4 z6 p" ?% c' a' D6 n2 v+ } ;; give the turtles an initial speed
7 [6 i# B4 H- q% }' v ask turtles [ set-car-speed ]2 I/ ?; H; E; c( ^. d
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reset-ticks% T; z, r2 b. A9 L6 y3 R7 [" R# f3 ~
end5 m, C9 n! o7 X) V) L+ R
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;; Initialize the global variables to appropriate values9 ]" V; I# F& E9 ~
to setup-globals
8 J0 ^4 i/ b! z3 g8 h set current-light nobody ;; just for now, since there are no lights yet
( {; d# r) }8 @# h% k" u& I set phase 0
: u3 l, I( }. T5 t% Z6 Y set num-cars-stopped 0
4 P5 A) t0 e) N1 i set grid-x-inc world-width / grid-size-x
( \2 W6 I0 R/ |; l8 Y! [ set grid-y-inc world-height / grid-size-y
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* g4 F# l; k5 C" h7 F. r ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
- I- z& c% E7 ^0 I set acceleration 0.099
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; m# c' L. V! }4 q9 y$ j;; Make the patches have appropriate colors, set up the roads and intersections agentsets," ^0 Z& [+ t1 [# `3 M, @, G
;; and initialize the traffic lights to one setting' G$ h( }; b" m" Z# `8 }) V* n
to setup-patches& s7 ]2 I: M0 j+ Q1 @; S( u; n
;; initialize the patch-owned variables and color the patches to a base-color
9 L0 O/ t. _+ L, |4 Y4 L8 A# @ ask patches
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% v( M7 V) V- P6 g: E set intersection? false) ~' z" d+ Y; N
set auto? false/ Y$ I; N7 z3 Z1 D( o8 d6 K
set green-light-up? true. G/ n- L# c& Y+ i, a5 Z
set my-row -1
, E( V) s |* c set my-column -1# K0 Z( q& @& ]" ]' p
set my-phase -1
; o) ]5 y% G' A F* E, F8 E set pcolor brown + 3 L) P9 w. ^) y* h: g: J F
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;; initialize the global variables that hold patch agentsets
. R; d, `2 r! W0 h6 S: u y9 Q" t set roads patches with" w- x U0 k. V4 [+ R. \3 X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) M) _% j1 T; Z4 k! Q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. Y" C1 N* {" X1 I" \
set intersections roads with3 ~4 t8 b$ r6 B: L; o$ G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) P7 }! E( d4 V; c; _6 M5 H (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! \- S; z& z- F7 p z) e0 i4 t
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ask roads [ set pcolor white ]; w, @* t% `6 T/ [! o( ^8 ^4 H
setup-intersections1 O. Z$ h! C9 _6 s" N) ^- j
end l9 g% Q% {7 z7 E
其中定义道路的句子,如下所示,是什么意思啊?6 B( @ g8 }2 |3 V- E |
set roads patches with' |% c; l/ W( e6 b7 q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ n# Q; m# m! v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# m( E" V3 l4 Z
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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