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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 _" t6 m; q& ]8 e$ y1 a; F+ }netlogo自带的social science--traffic grid这一例子当中,4 X& `6 w* d' @% L3 a' v _; w( A
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction- t$ l5 m1 V9 L$ ^4 R; D4 m
grid-y-inc ;; the amount of patches in between two roads in the y direction0 z0 d& ]7 \" C6 l) n3 r
acceleration ;; the constant that controls how much a car speeds up or slows down by if
5 X1 _$ i. E, d( s' v6 {" V* j8 } ;; it is to accelerate or decelerate7 W! w, k5 [; M1 k
phase ;; keeps track of the phase. N t: P& ~: E7 M
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) N0 x' ?: ~( w: G8 m, A0 G4 k1 p" z current-light ;; the currently selected light
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;; patch agentsets
# T8 l+ b _5 n8 z8 B* N1 A intersections ;; agentset containing the patches that are intersections: P4 s& g. f. O. M3 R! ~1 o4 k
roads ;; agentset containing the patches that are roads
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X" x1 t9 G$ x; r9 d4 ^turtles-own. P, S* h7 L+ p! ]8 M+ q2 k
[
/ Q1 k, l4 p' ~9 @# [) Y" I speed ;; the speed of the turtle: B# `0 P4 X( @1 `
up-car? ;; true if the turtle moves downwards and false if it moves to the right; p% G0 Z# l+ Y* [2 ^! b
wait-time ;; the amount of time since the last time a turtle has moved: E6 B0 T4 `' @0 g4 M
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patches-own. s+ w% G) h C* s8 G4 |' o8 p
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intersection? ;; true if the patch is at the intersection of two roads+ W& s8 z& J5 K9 {' N4 m( R$ K) Q
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
3 l& v- R/ f1 { O, D ;; false for a non-intersection patches.
y" R u+ K9 x3 v1 S( w! K my-row ;; the row of the intersection counting from the upper left corner of the
7 H9 l5 l8 I9 r ;; world. -1 for non-intersection patches.4 `& n- d; N: J# ^
my-column ;; the column of the intersection counting from the upper left corner of the
3 X" w. m/ |" ~8 E2 a/ z0 o+ }8 \3 x ;; world. -1 for non-intersection patches.0 d0 ]% J! G0 V, q* d4 N5 B+ X
my-phase ;; the phase for the intersection. -1 for non-intersection patches.$ m5 j" Q. x6 c6 a5 A' `4 i& z
auto? ;; whether or not this intersection will switch automatically.
1 H* f/ x2 `- b ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;) W- ?$ {4 g" v9 ]; n- B1 G
;; Setup Procedures ;;- Z j$ }. q8 ^! e. e
;;;;;;;;;;;;;;;;;;;;;;8 `. v% f! ^4 i# m s" f: v) z* ?
0 A1 d. G* b0 p& |% l;; Initialize the display by giving the global and patch variables initial values.
8 `/ e% y# Z/ w- F% |4 k;; Create num-cars of turtles if there are enough road patches for one turtle to- p& c/ }- X; W* D7 A2 h7 |
;; be created per road patch. Set up the plots.
. N. M( U0 [& F9 G; q( V4 f9 Xto setup
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setup-globals7 J* i. e( Z9 j3 k: r
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;; First we ask the patches to draw themselves and set up a few variables
9 O/ f* c) T5 \' t setup-patches
6 T" W- l, e3 T3 _+ H0 ^- G9 j; P make-current one-of intersections) ]. S, Y$ x. p
label-current
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0 t. M6 z- s3 T3 T3 K& Y7 N8 n, h set-default-shape turtles "car"+ N* l5 P* M/ X- M1 z* B$ y
6 T3 X6 q# x! b3 U; |& C: o# ` if (num-cars > count roads)
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2 `& e$ z2 X6 w, S' p4 @" O5 h! V user-message (word "There are too many cars for the amount of "
) T# j; C1 u; y, Y "road. Either increase the amount of roads "- g( q! B$ r7 S9 }/ f8 R9 X- G
"by increasing the GRID-SIZE-X or ") |$ v: o( m3 y4 F& w
"GRID-SIZE-Y sliders, or decrease the " u+ V* C- Q/ g- C
"number of cars by lowering the NUMBER slider.\n"
$ A k" q7 x3 r "The setup has stopped.")
3 U. Y1 Q* W, `0 D* o stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( D1 E. v- q& I" R) U5 p
crt num-cars
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setup-cars
% Z$ Y( p# J) L1 }/ n- ]; E set-car-color
6 z& f2 d% H4 i( G N) w& X record-data
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- l. p. }' E0 m2 { ;; give the turtles an initial speed
/ t2 L" u9 d7 K) t7 u3 M ask turtles [ set-car-speed ]
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reset-ticks* x: F E- b5 P `
end5 _/ a6 W8 j) R0 h
0 D8 z- f4 R) M' V S;; Initialize the global variables to appropriate values" O& Z2 W3 ^+ ^3 H
to setup-globals
/ M( M/ G5 E$ b% m set current-light nobody ;; just for now, since there are no lights yet
$ D1 ^3 Q* E3 E3 H set phase 0
; F/ o+ k0 U/ K/ X+ ^3 ]9 @( O set num-cars-stopped 09 ^) p- }6 `. z! ?
set grid-x-inc world-width / grid-size-x3 Y4 w( b: N" }" E" x3 e
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- W6 y4 R8 F. Z5 y" C- }9 I
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* q2 V& k- v" C5 N/ [3 h
;; and initialize the traffic lights to one setting( r0 o0 J/ c$ i8 Y& ~
to setup-patches' I4 C, c* ]8 V) z4 @+ A4 T1 U
;; initialize the patch-owned variables and color the patches to a base-color
$ c) U3 @: P3 I/ `% D: i ask patches/ D8 d* K ?" j* Y6 p
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: t- |5 C6 @5 [3 f2 c! P+ N set intersection? false8 O% U) I+ g% n$ S8 m
set auto? false( T* N. K. P( c0 t9 }# G
set green-light-up? true
- J/ n. I/ Y' P L5 J: r* ]# L8 F set my-row -1
$ I8 x, O' w6 Q1 y9 V- M7 a6 A set my-column -1
/ F6 E. B2 Y( {( W! ?$ g- { set my-phase -18 y8 D. m3 g! b
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets( `; Z- f$ o& p `
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. h) s" W' f; C w) z6 ]
set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end
9 G: h6 Q- V: Q* H! Z其中定义道路的句子,如下所示,是什么意思啊? @& q- T9 ?/ ?( ~7 L
set roads patches with: T: e* }) g. B) e5 B& y2 I3 B' V
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 R! V1 L+ S2 ]* ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ S% }, A! k/ {, L' B5 T6 ^% ]
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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