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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。 i, }; P: a2 i. u; ]
netlogo自带的social science--traffic grid这一例子当中,
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grid-x-inc ;; the amount of patches in between two roads in the x direction
6 y; U8 t' |9 m. k. {9 S" F m5 n grid-y-inc ;; the amount of patches in between two roads in the y direction7 H+ K9 n4 N0 y: S5 }) c
acceleration ;; the constant that controls how much a car speeds up or slows down by if: R2 D, s7 H7 C) ]) Z3 |
;; it is to accelerate or decelerate0 Y6 B* x& I; y p/ E
phase ;; keeps track of the phase
{( J( X* a2 M* L* a num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
# r& \% Q/ i0 o5 w- `6 Y3 [* l current-light ;; the currently selected light
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% @9 C8 {7 |7 s& M* n# s ;; patch agentsets4 n D1 M- z2 ]% M0 ^
intersections ;; agentset containing the patches that are intersections) P3 T5 A! X, v- l7 o
roads ;; agentset containing the patches that are roads
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turtles-own% Z1 R: a. \/ N. b6 ]
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speed ;; the speed of the turtle& B3 F5 ~* o# P+ j4 {5 m$ s" n
up-car? ;; true if the turtle moves downwards and false if it moves to the right* w7 J: q2 p% L) J3 q0 |
wait-time ;; the amount of time since the last time a turtle has moved
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7 y0 ]* _, ^: ^patches-own. N& Z% Q+ U. i! s# X1 h w
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# y% j e5 H9 j intersection? ;; true if the patch is at the intersection of two roads1 S$ m4 o Y& w) O$ j4 ^
green-light-up? ;; true if the green light is above the intersection. otherwise, false.! f2 _. t. B1 N9 p. D; \, ]
;; false for a non-intersection patches.
( p! [( y0 Q: h5 Y- d my-row ;; the row of the intersection counting from the upper left corner of the; g! s m- ?. o+ c- j
;; world. -1 for non-intersection patches., z4 ]8 M. ~/ |
my-column ;; the column of the intersection counting from the upper left corner of the" d7 A7 [6 e4 g8 i( e1 l
;; world. -1 for non-intersection patches.# ?' s1 Q4 {) t8 g0 g
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
1 |$ u+ a; n( V5 B2 S auto? ;; whether or not this intersection will switch automatically.: [2 U# Z2 A4 F) ?6 y1 @ I! [+ }
;; false for non-intersection patches.
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# Z; H2 _0 W: {- s; ^& F6 `8 };;;;;;;;;;;;;;;;;;;;;;% a1 u: F9 m: A- g
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values./ j- H( z% Y G
;; Create num-cars of turtles if there are enough road patches for one turtle to
, I/ d- S, S- M0 h;; be created per road patch. Set up the plots.9 C0 a& S7 H2 s+ f" _" b' P* `. P
to setup
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setup-globals
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3 P9 y. O: Q: A* a ;; First we ask the patches to draw themselves and set up a few variables2 i" Y1 a* B4 C, s
setup-patches f9 J u9 a$ @0 c0 p6 F
make-current one-of intersections/ b% I$ A1 H, [
label-current
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7 j5 r; a M2 u2 S- |! W set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
4 a9 G5 L7 [$ j/ }2 m6 V "road. Either increase the amount of roads "
7 s3 n" Z/ v, D, D" U "by increasing the GRID-SIZE-X or "
& f. V" X' [# X: x8 y2 m "GRID-SIZE-Y sliders, or decrease the "
8 O" m9 F J6 H% g# S "number of cars by lowering the NUMBER slider.\n"
1 D6 u4 [9 \. }1 d6 { V8 B- z. L7 Y "The setup has stopped.") Y: N8 b& O) u8 ~, E, O, n
stop# j; ~6 J5 n2 d5 Q) l
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# L: s8 [ m1 ?- u! s! k ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 u# K9 d& W7 t4 H; D$ E8 \" t
crt num-cars# h! P1 z5 L6 d" U$ g
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4 j9 U) ?) W1 C4 F setup-cars
. n& Q; ~8 L& L+ a& S7 x set-car-color
( p g4 I, d7 a/ [" D4 l# B* r record-data
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/ w& x5 C" B- T% s ;; give the turtles an initial speed
0 `+ k; {6 v2 Z" `* E N ask turtles [ set-car-speed ]/ v2 J) ?+ F; f
3 ]9 [/ Y: f% K# t reset-ticks
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5 H' c2 d; r2 X! X;; Initialize the global variables to appropriate values8 D0 Q* r# x; Y8 u% o
to setup-globals
, V8 W3 X; \4 r set current-light nobody ;; just for now, since there are no lights yet
" u/ C9 u, Q0 P) _. R# g# g set phase 0
0 N f6 H9 B* G" d set num-cars-stopped 0
! ^3 q x7 [, _& M# _ set grid-x-inc world-width / grid-size-x+ }0 ~3 y$ l- S: N+ U
set grid-y-inc world-height / grid-size-y! ~) V6 O, k R, F v5 \$ g
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ V4 G# K8 x5 e( H set acceleration 0.0995 \* v, @9 w2 w
end1 F* K0 D" K* W) `: m! y P
, j [% ?7 M& P$ _7 h;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- p5 P, h* N6 p2 ?' y: N;; and initialize the traffic lights to one setting
- e2 _; [1 h0 [to setup-patches
0 p8 |' i6 ^0 ?$ s+ }( R' I ;; initialize the patch-owned variables and color the patches to a base-color v, j: h9 N! X# O' t6 d! G
ask patches0 j n. ?: t1 m7 L
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8 l; t$ |* g2 A set intersection? false; O9 T0 n3 o' G# |
set auto? false/ H5 P# G! |) a' S0 C6 o. B( G
set green-light-up? true
, T" x7 I. a- n8 e! _. ?2 ^ set my-row -19 @2 h3 N0 O8 k6 }/ D. K5 \: j
set my-column -1
) P$ y8 T! ]- m+ P C/ K+ g set my-phase -1& \; H% ]! r2 z! X) @
set pcolor brown + 3; ]6 o' |; ?, }$ Z2 a6 b
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/ E; Y3 L: B4 u1 [ ;; initialize the global variables that hold patch agentsets
- t5 s5 O* n, v; n set roads patches with
0 c- B7 m+ Z5 G$ f7 g9 Q5 Y* c [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 }( T2 }1 Z4 L* f7 s W
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 `. b. z" G/ y: ]" ~
set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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1 A* H0 }" c9 K2 f6 q ask roads [ set pcolor white ]
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end0 B. K8 V' ~! U) ~1 p: S2 u
其中定义道路的句子,如下所示,是什么意思啊?
4 {6 Q1 G3 n' g( z+ k: u set roads patches with) _( z7 O& @* O3 O! }, s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& j% b7 A; W0 Q7 j' J& q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, y% H; u. e+ {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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