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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。
: h3 D9 t' K2 W: bnetlogo自带的social science--traffic grid这一例子当中,
9 J; X3 K# O8 P8 Sglobals
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* c) V) @$ g/ m2 J3 t8 _2 m9 @ grid-x-inc ;; the amount of patches in between two roads in the x direction& {9 r1 r6 e, K8 c" K2 ?- n
grid-y-inc ;; the amount of patches in between two roads in the y direction3 P/ Q n1 o4 O
acceleration ;; the constant that controls how much a car speeds up or slows down by if
" g! s: d9 b3 P. {9 j ;; it is to accelerate or decelerate
5 I' ]' o' S7 `- M* S3 B phase ;; keeps track of the phase
0 ^7 _! J' a5 d: m# x num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ g9 C3 `# ?6 d' q/ \; ^2 M1 V) Z current-light ;; the currently selected light
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! ~' v/ C8 m( H1 C3 L ;; patch agentsets
: w6 E4 W& g5 _+ ~. m C6 I1 _ intersections ;; agentset containing the patches that are intersections A- v; Z- W o0 u0 U. F
roads ;; agentset containing the patches that are roads' A2 s" e5 f. [8 M6 e
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) Y( `# r4 X, C) Q5 Q$ G J; \8 Qturtles-own# U7 }+ I2 M& c' E# m
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) r& }! V! S m speed ;; the speed of the turtle7 g9 b7 m3 D; c |
up-car? ;; true if the turtle moves downwards and false if it moves to the right* T7 I. T: G5 t( }6 a. ~
wait-time ;; the amount of time since the last time a turtle has moved2 f! Q6 g/ k: @1 g
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6 x/ e: i1 P: S4 x$ S% Ipatches-own! f0 o: y/ K8 y+ Q7 B( _
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intersection? ;; true if the patch is at the intersection of two roads. n. I. H+ H& _) \
green-light-up? ;; true if the green light is above the intersection. otherwise, false.; v3 j f7 f; r) g* t Z
;; false for a non-intersection patches." p1 @6 U6 H4 r7 w6 Z8 B
my-row ;; the row of the intersection counting from the upper left corner of the k3 m$ ?5 Y: ~
;; world. -1 for non-intersection patches.
' g i. ~ {: e. {2 B- C* y my-column ;; the column of the intersection counting from the upper left corner of the
& @: v( m6 u; }( x3 W; j# | ;; world. -1 for non-intersection patches.% y( E/ ]/ A' s" ]
my-phase ;; the phase for the intersection. -1 for non-intersection patches.: N, r7 g( R; C
auto? ;; whether or not this intersection will switch automatically.
6 q' N- |! s7 `& N; f ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
, z. s) Z: }& w ?9 I* C;; Setup Procedures ;;+ s2 s! v* j. U7 L
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* |( }: R6 O; Z8 [;; Initialize the display by giving the global and patch variables initial values.
2 T% X5 V+ k7 E;; Create num-cars of turtles if there are enough road patches for one turtle to- H! q h! k% B% J# @
;; be created per road patch. Set up the plots.
D+ u6 G5 O6 R a; @$ Jto setup" [. Y6 r$ X1 m7 B" x
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setup-globals
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( S; ^* e: R; X' n ;; First we ask the patches to draw themselves and set up a few variables
3 l3 h6 v& E X% f setup-patches
& x$ N! H* }2 P; r( F& u9 j make-current one-of intersections
0 V3 `5 l7 O! z$ N2 L label-current
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4 H$ _' {0 }# p8 T' ] set-default-shape turtles "car"; B; |4 L C5 Z/ t
2 D4 }; U+ k4 ]# u$ v- A* }7 e if (num-cars > count roads)
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* a. h0 ?* m* h user-message (word "There are too many cars for the amount of "
, d' L: E A6 R% g, {/ w4 s "road. Either increase the amount of roads "2 P* j9 P, j) @" H3 ?. w
"by increasing the GRID-SIZE-X or "
( R6 N# v' e% v3 o "GRID-SIZE-Y sliders, or decrease the "9 M+ X9 F6 E$ _
"number of cars by lowering the NUMBER slider.\n"; k. d* @4 w. t+ ~) A
"The setup has stopped.")2 @7 ?: z$ x. q! L
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 g* h+ l. v8 ~ {5 g
crt num-cars
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; }3 V3 h% Q- |! }% ^/ {$ X( ? setup-cars/ R. r9 A* n) Z; M; h7 k; B" t; ?$ l
set-car-color/ W: Z8 n& I [" q
record-data4 Q7 y* W# B8 |0 x
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;; give the turtles an initial speed
" I9 {. W2 |2 D5 G ask turtles [ set-car-speed ]
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reset-ticks+ U9 V8 G* M- M _! [- R' j- L
end- B( ~6 U. }% ^, l( `0 @
# i$ b" w+ ~/ y" c;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet6 [( ^, X4 m h2 }: K4 e: H0 F
set phase 0
8 y ~) U* Z7 |$ D- e set num-cars-stopped 0
1 }3 c. ?: R! v# o+ A* T6 Z i& \ g set grid-x-inc world-width / grid-size-x
, o. P M* |+ j) V N$ U7 a& ` set grid-y-inc world-height / grid-size-y; j" R% Y8 u3 k1 G
7 H; W1 E: W' J4 v1 R ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 J4 }+ k8 s: Z& s) T. s: j T5 |
set acceleration 0.0995 b* }+ I+ | P! k
end) d# j( W6 ^* i' J' O' C+ `9 ^
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 ^/ D% ~- H! W# x1 }
;; and initialize the traffic lights to one setting
. {' J' d9 a T; A4 j$ oto setup-patches- ?3 \; q6 t6 u3 q3 h
;; initialize the patch-owned variables and color the patches to a base-color
6 [1 p: Y. d; w6 N! U ask patches: V Z9 s1 {' d4 u$ j
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- v! e5 ?; |. K- `4 H) {$ I4 { set intersection? false8 X1 c6 r- h# h8 l- A# i9 \5 k
set auto? false
- X w! U) L8 }4 H+ R set green-light-up? true$ f4 z/ L- T6 G' b
set my-row -1
8 m) y+ e3 W) J, x set my-column -11 t6 ?0 L! B) F" h& m Q8 Q
set my-phase -1
+ f# ^4 R5 u' ?7 ^" e( O set pcolor brown + 3, h Q0 a% ^7 p* q2 Z# `
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;; initialize the global variables that hold patch agentsets- Z9 x3 m, d4 Q; T8 g0 c
set roads patches with6 f, S9 [. \* e# k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or a( Y" Y! D+ G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 @* _1 q# m6 |/ K4 B( g( Y
set intersections roads with
7 B2 F2 B- o; Z u( D [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and5 b0 r. P0 }; x, L# R
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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! x) C7 { x# R! H ask roads [ set pcolor white ]1 q% ~& K( E' ?, m" _9 q) m2 N
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?: W% A' E4 F, i$ w2 w. L! u6 K
set roads patches with7 t& J& F6 i/ b1 R# ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 T4 X+ D. U- W+ l% }8 a
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. M1 V. s# O7 w/ A- y- g! t
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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