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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。
; e% I8 o! V" q. c6 b0 Jnetlogo自带的social science--traffic grid这一例子当中,8 j, o+ P, A% C/ w* D4 u4 L( \
globals: q3 \7 I# R2 `% ^
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grid-x-inc ;; the amount of patches in between two roads in the x direction
: u$ V6 F- u4 ] grid-y-inc ;; the amount of patches in between two roads in the y direction: L' z/ V( b$ D* E1 R0 X3 }
acceleration ;; the constant that controls how much a car speeds up or slows down by if$ E7 ^% Q5 w9 u7 v9 R. S k9 x% M+ q
;; it is to accelerate or decelerate& q0 k( G/ V" G- u4 _
phase ;; keeps track of the phase2 o% g" b8 Q1 ?1 u. ^0 B, I
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
1 d. G3 P' `- x6 }* | current-light ;; the currently selected light+ h8 I! _3 l3 g6 T# K2 M
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;; patch agentsets
1 a" `6 Z! ^# T- _ intersections ;; agentset containing the patches that are intersections
7 `3 d, s& \( Q/ M# n+ s roads ;; agentset containing the patches that are roads
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turtles-own" q- {, q" T3 a4 @. `
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speed ;; the speed of the turtle- q* B; |8 Z$ f$ t
up-car? ;; true if the turtle moves downwards and false if it moves to the right. \1 U! \- Q/ I3 b1 \* `, J
wait-time ;; the amount of time since the last time a turtle has moved
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/ B$ n: S6 S2 q0 m' V `5 ^patches-own
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2 H! L) b1 V9 v6 E3 K1 O intersection? ;; true if the patch is at the intersection of two roads# W7 ^3 E: M# M- [: Z, [7 T
green-light-up? ;; true if the green light is above the intersection. otherwise, false.. }& p) q0 A( S1 n7 d% }" c% p; a
;; false for a non-intersection patches., T5 U- |# l/ |( Y+ \. |2 u/ i
my-row ;; the row of the intersection counting from the upper left corner of the" k6 W) r* H9 v$ m/ \& r6 Q
;; world. -1 for non-intersection patches.
( P) E. D) a; X# r6 c$ E my-column ;; the column of the intersection counting from the upper left corner of the0 O! Y4 m3 x, ~& y2 O! p
;; world. -1 for non-intersection patches.
4 Y. a! q7 W4 |9 k my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 ~) u8 u6 y T9 w auto? ;; whether or not this intersection will switch automatically.0 ^+ B# m& v2 Z0 L+ `3 C
;; false for non-intersection patches.* d, s! P: H/ q# L
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;;;;;;;;;;;;;;;;;;;;;;
3 M0 j9 h: S( x3 K$ i' g' `2 F0 k;; Setup Procedures ;;% [ [' r) l. J$ y [4 @' f
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
* I% R, x& r4 I P8 K( c) `;; Create num-cars of turtles if there are enough road patches for one turtle to
6 Z7 F0 D# U5 J% S' H G( Y( Q;; be created per road patch. Set up the plots.
' m3 ^2 @) Z/ \! _8 a4 b- Oto setup
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! b1 e7 ~( E5 q+ o* u setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
. x6 G2 N) ?) T setup-patches6 E, _5 q7 B* V! }! s7 N
make-current one-of intersections
1 I' b6 F9 I: K% J& j! [ label-current, e. D/ y% C7 C8 a, x
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set-default-shape turtles "car"
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if (num-cars > count roads)( V# ^. e" @0 w+ ?1 g1 N7 x3 X y
[
) S2 W z7 l1 E7 r, M1 R! C user-message (word "There are too many cars for the amount of "% j" N6 ^% h, q" N! R* N D
"road. Either increase the amount of roads "4 V y# I" A- x9 G$ W
"by increasing the GRID-SIZE-X or "
* `* h0 H) g* m4 C5 Y7 N$ L "GRID-SIZE-Y sliders, or decrease the "1 [5 m! w+ Z& b) k& \6 l7 a3 O, m/ p
"number of cars by lowering the NUMBER slider.\n"; v* `5 {& c8 @* d# a1 S
"The setup has stopped.")* U4 z! Q* [* z7 F
stop
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5 T, s0 S& W r# {$ |3 @# `2 Y ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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set-car-color
0 _, X* h1 O! n8 Q record-data
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;; give the turtles an initial speed
5 |7 R3 x( c* R2 Q7 A* v2 i ask turtles [ set-car-speed ]+ c! C+ P* p# y5 m, _% q. r( j
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reset-ticks
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;; Initialize the global variables to appropriate values( t+ t- I# Z6 |4 w9 f7 p/ b
to setup-globals
2 K C+ P; Y3 T- s set current-light nobody ;; just for now, since there are no lights yet
# e) k3 H. g/ i9 F) x& x- ~ set phase 01 W3 L5 o8 K' J& o I3 C- ]# K1 i; N
set num-cars-stopped 0
1 c3 @ Z+ o& n3 v7 {* ?/ ]9 g set grid-x-inc world-width / grid-size-x
) u! U$ g; n- f: ]1 A. x- ?0 Q- d set grid-y-inc world-height / grid-size-y
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2 c$ D! f; N2 y ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, z( T7 i' ?/ `! }) S) [
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 c" i" W9 ]3 h% E" S1 M" r1 t;; and initialize the traffic lights to one setting
. p, |0 v& x+ I: d5 gto setup-patches
* H6 n) V0 I1 z: S% Q ;; initialize the patch-owned variables and color the patches to a base-color& g* X5 I1 B6 y+ l, z
ask patches
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set intersection? false; M P% ?4 w& ~5 \
set auto? false
# Z- {0 ]3 B; w6 J! g Y0 l- q set green-light-up? true( x [- v7 W# `8 R4 a! g
set my-row -1: G' I1 a$ F* g4 F
set my-column -1
/ _9 a( V3 Y' [: `( K5 q0 G set my-phase -1; s6 B; Q( N/ @7 R- L! G7 S! G
set pcolor brown + 3
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$ N7 e3 E. D6 L ;; initialize the global variables that hold patch agentsets
4 d1 N/ G0 H; S set roads patches with
, n0 C: \# H: ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% R+ d1 _5 i5 ] H h
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ [# Y7 u; [9 Q1 ^. t. }/ c2 w1 m set intersections roads with3 P2 p& M( g$ v; |. {1 h1 v4 u+ f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: H% t5 h2 }: a4 _' ^4 K
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! B( `7 N! [4 V7 M) @) Q9 }$ T# ~
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ask roads [ set pcolor white ]
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end
- q& `7 k( D0 C& I) v其中定义道路的句子,如下所示,是什么意思啊?4 N, F; I: K1 s. ?8 N
set roads patches with
- K. t2 z6 @- ~1 Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- b: b! t& f4 _" R! V9 M; M$ [
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! n: b) [# a" N. ]. \: A3 i
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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