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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。
% `- ~0 {: K/ j$ j8 Y# T [netlogo自带的social science--traffic grid这一例子当中,
, |! r6 @0 ?6 fglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction% x3 Y. D4 e' f7 x. P) l+ b
grid-y-inc ;; the amount of patches in between two roads in the y direction/ q* H! J; x0 q7 z) u: x
acceleration ;; the constant that controls how much a car speeds up or slows down by if3 M. v ^1 I* V, }( G# ~$ L
;; it is to accelerate or decelerate
& e9 k4 h! b4 ?( |- v0 a/ A0 P phase ;; keeps track of the phase! l+ E' q$ A( t: m2 q& `# x/ f
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ j* l6 y/ U$ d current-light ;; the currently selected light( k$ ]4 ? @9 ~% y. ?5 K3 m2 L' L
9 X. ~- P7 O% R/ C0 U9 B7 N5 ~ ;; patch agentsets
) z7 c) V3 t4 \$ y7 A" L5 @ intersections ;; agentset containing the patches that are intersections
$ t0 f2 ?; z% V1 d& Y m roads ;; agentset containing the patches that are roads
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# `+ _7 t. U) M* _; u$ L7 Qturtles-own
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/ Q$ ~+ h3 d! N9 O! t' [9 b: f speed ;; the speed of the turtle
- n' C% B/ G' p: b4 m up-car? ;; true if the turtle moves downwards and false if it moves to the right- B6 `& z! a: T7 L% `1 F
wait-time ;; the amount of time since the last time a turtle has moved
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7 f% i) W9 Z, hpatches-own( H) a4 v4 \. l3 x7 [$ A7 Q
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intersection? ;; true if the patch is at the intersection of two roads
) I' A% m, l/ |" ^ green-light-up? ;; true if the green light is above the intersection. otherwise, false.* N* {/ y* G/ @; ]' a# n- T
;; false for a non-intersection patches.
6 u0 ]$ G& v2 `( B+ _9 w my-row ;; the row of the intersection counting from the upper left corner of the
4 j. ?2 w% h$ K% H z% w. \ ;; world. -1 for non-intersection patches.
$ W5 f: ~! ~" e# p7 i my-column ;; the column of the intersection counting from the upper left corner of the4 L! J; u4 u2 z% A4 z5 n% n1 _
;; world. -1 for non-intersection patches.' b5 i5 ^. S! s6 t; h6 f j `
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
& \$ ^0 { q& t6 X e$ I2 b" D auto? ;; whether or not this intersection will switch automatically.
4 e- N* K- l% M1 O4 Y2 N/ a ;; false for non-intersection patches.9 s9 P- n# x, J# k
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;;;;;;;;;;;;;;;;;;;;;;) i7 v+ M, F4 W
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
- v# m3 ?, A- ~6 C7 v1 X, e;; Create num-cars of turtles if there are enough road patches for one turtle to
$ q3 d, p% e( X X$ s+ y& B0 P;; be created per road patch. Set up the plots.$ }! Q6 x' P+ J% ?
to setup
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setup-globals3 E+ U: [! T- u+ Z
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;; First we ask the patches to draw themselves and set up a few variables
" ^6 _: K) M" `% w setup-patches
* `5 B0 w; [+ C( D make-current one-of intersections
7 A( o y. ^. [( L* X label-current- N. z1 s4 Y: ~( d6 S5 K' o3 r: b
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set-default-shape turtles "car"+ @7 m3 S8 S9 `) ^
# J9 p4 Q* g7 G; v1 G: ^1 ]7 l if (num-cars > count roads)2 o$ s; x8 Z5 u! ]
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user-message (word "There are too many cars for the amount of "6 Z4 |* l0 @% q0 \8 f# E
"road. Either increase the amount of roads "- U) G3 l0 ?& |+ `
"by increasing the GRID-SIZE-X or "+ F' l7 E7 m6 J- ^" a+ t
"GRID-SIZE-Y sliders, or decrease the "
: U4 K6 k0 [% r3 A# ~! D "number of cars by lowering the NUMBER slider.\n"3 L0 N$ F1 a" `. C; I
"The setup has stopped.")5 x% q2 E6 ^6 e( q0 |& g
stop
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( {1 T7 {7 d0 e) P% H& b- _ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
" G% v6 Q( O7 \ crt num-cars
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Y2 |8 `* b1 i$ h. J0 j% i setup-cars
& g5 |) n' D. ~9 J set-car-color
: A R/ f1 p' t record-data
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;; give the turtles an initial speed
2 g7 j3 K+ z5 h# |- ? ask turtles [ set-car-speed ]' V# T5 |$ j/ [3 ~$ [
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reset-ticks3 i! N& v6 z1 @( `
end, g( W( B7 l+ H% U( r$ l1 L7 z
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;; Initialize the global variables to appropriate values1 e2 p5 @% r3 n* N, R: R
to setup-globals
, c# D9 r3 Y2 M6 D set current-light nobody ;; just for now, since there are no lights yet
+ _; V; h) p e' c2 ` set phase 09 O+ Q7 s9 v& \3 C/ d0 N
set num-cars-stopped 0
* d( w( z4 j& z3 J# r/ C set grid-x-inc world-width / grid-size-x) W" _! I5 h8 i
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
0 d# c3 }7 F. Q0 K set acceleration 0.099
+ d: a7 M; J, ~4 x, f# G t% Tend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 F+ E' O* X* V4 b" r* [& R1 z
;; and initialize the traffic lights to one setting( b# s' ~0 [2 q
to setup-patches; j7 o9 c$ o' m7 j8 {
;; initialize the patch-owned variables and color the patches to a base-color; a4 m" U5 i0 j( l* {! o: z' p
ask patches
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set intersection? false
$ U% E6 x' Z# n1 A6 y" B+ K+ R1 u# A set auto? false& ~7 n/ ~4 k5 G5 \. Y
set green-light-up? true
. m+ ` _3 s( T3 F& g( g8 f3 n set my-row -1
$ m8 Q+ {' ]) z9 `: w set my-column -1) V7 w# J9 \ U' V6 v
set my-phase -1
% o# B+ _; `) r set pcolor brown + 3
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; f) ]* y# n- J: m+ Y% _) ? ;; initialize the global variables that hold patch agentsets
% ]% I. ], E3 V/ e# ~ set roads patches with
/ g4 T( M& ^0 |( u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; [* r& h4 A6 {, M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 u; v/ q$ i2 M+ x' ^6 D1 q9 q0 s set intersections roads with
! }" n4 x: ~! q8 h9 d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: U4 \) H& a8 q N1 `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?6 Q. L# K9 \: i( b" c
set roads patches with
; r. s Y* \3 }9 m" S6 I) K3 g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ S" C2 l, S0 x. L; A6 p (floor((pycor + max-pycor) mod grid-y-inc) = 0)], J$ I1 q; v: m7 O3 A, N
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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