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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 T5 z" w. g9 @" h0 y( R+ G: d
netlogo自带的social science--traffic grid这一例子当中,5 _8 X u( c6 F$ O& Q
globals) m) O/ u: a4 v0 G* l
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grid-x-inc ;; the amount of patches in between two roads in the x direction! g8 F. [- G7 r4 F& B* B' b
grid-y-inc ;; the amount of patches in between two roads in the y direction0 d5 s+ a8 w g1 m
acceleration ;; the constant that controls how much a car speeds up or slows down by if9 n& ]; Q# T+ l3 w8 Z1 l
;; it is to accelerate or decelerate
- g# P, v4 x9 s5 m) X phase ;; keeps track of the phase6 @# t$ ]; N4 O0 F
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure Q" V/ C2 Y6 _* R( d, G) N
current-light ;; the currently selected light
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;; patch agentsets
, q# Q% i! Y+ T0 O }6 V3 ?; S intersections ;; agentset containing the patches that are intersections
6 x+ e$ {* l% y0 i m1 {* s$ x* ?( o roads ;; agentset containing the patches that are roads
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$ c2 W* b% x" Y* o$ |turtles-own( _/ l$ ?( Z2 ]
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speed ;; the speed of the turtle9 U& L. Q: Y9 n" T
up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ e2 \8 U6 [: J3 u- X5 W) d# b; I* a wait-time ;; the amount of time since the last time a turtle has moved6 [+ h) a, c3 `. \' n9 ^" O0 n/ @
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patches-own3 z- Z- Z+ Z% _3 q* D
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intersection? ;; true if the patch is at the intersection of two roads
' B( Y! L% d- W8 s" j green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ O# E! f) B8 w; O. D) a9 q ;; false for a non-intersection patches.7 ?6 P: o4 `+ q+ O# _
my-row ;; the row of the intersection counting from the upper left corner of the
! E& K) j* C% t. P+ q ;; world. -1 for non-intersection patches.
- }* R) \, j1 h# ]. r! s my-column ;; the column of the intersection counting from the upper left corner of the
2 K+ u( A5 F- N) Q9 Q1 ?% [3 T \ ;; world. -1 for non-intersection patches.
& p; J) I* r- P1 ?9 M6 e my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: B9 u. I% X' F auto? ;; whether or not this intersection will switch automatically.
6 }4 d# `( p# q6 o M# I4 Q ;; false for non-intersection patches.5 h5 a( x' [7 i# U
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9 j- y' }# c$ A$ \8 o;;;;;;;;;;;;;;;;;;;;;;, J6 ?# g/ @3 L4 c$ S
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.! k: Q( U9 @- ]$ k3 Y4 _" X/ ?
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 _3 t8 V/ Y$ C$ r0 T2 S;; be created per road patch. Set up the plots.# j# \& r( J; l6 k5 }- U0 |/ ~
to setup! i9 M) q1 K/ p' o% d$ f! |- R
ca
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/ o* R1 m+ f) } r ;; First we ask the patches to draw themselves and set up a few variables
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make-current one-of intersections
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set-default-shape turtles "car"2 K- ]6 c% C- d# |/ _8 j
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if (num-cars > count roads)! e4 S. o4 k8 t4 \; F, H
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user-message (word "There are too many cars for the amount of "
# L% ]9 o2 i# A/ h* Y; W1 W+ w: | "road. Either increase the amount of roads "
7 ]) s2 I* z, w5 d: J! k, C "by increasing the GRID-SIZE-X or ": M: {* T6 {3 S3 J
"GRID-SIZE-Y sliders, or decrease the "$ Z1 E" |! Q& B- H
"number of cars by lowering the NUMBER slider.\n"* F2 y* O. W8 {# z/ b& \
"The setup has stopped.")
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2 L; w E) I. P5 D2 q ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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setup-cars5 h7 E( m E; b( I5 [5 C
set-car-color0 K: c) W( T/ t/ p, Y/ F2 h: Q7 K. w
record-data/ W! Y4 F7 x5 x: i' g
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# H B5 _% P9 A ;; give the turtles an initial speed
3 r: Q" S# F- j" A8 ?2 a# G ask turtles [ set-car-speed ]
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reset-ticks3 G9 r! _/ y I6 U1 s7 d& `
end: G, c5 q) Z. i/ X1 K K. N( V. m
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;; Initialize the global variables to appropriate values
% ?: r. r0 f% vto setup-globals
6 t8 F1 W. m7 B; M3 h set current-light nobody ;; just for now, since there are no lights yet8 ~' f# V$ z; g$ D: h- ]
set phase 0
$ ~* Z l L3 r" W2 J5 |) }- H5 P set num-cars-stopped 0' Q$ l/ ]7 K, ]- Q
set grid-x-inc world-width / grid-size-x# }4 Q2 t6 M! C' Z2 f
set grid-y-inc world-height / grid-size-y
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: N& N% ?, Y6 k8 { ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
, Z: q8 n$ K M1 M' s set acceleration 0.099) ]- K" N, [$ u. U! m# ~& [3 q
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ {& H' H' A6 `;; and initialize the traffic lights to one setting
% d* e O7 W; {1 Z* w- M# ^to setup-patches: z0 c7 {) r4 r, A# a+ ?1 o
;; initialize the patch-owned variables and color the patches to a base-color/ g l1 l* ?8 ]
ask patches
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set intersection? false0 M& e) f% {8 k6 W8 K" D
set auto? false
; H2 Y* t, `7 { set green-light-up? true
* I3 R0 n8 I5 ~9 ^/ Q set my-row -1
# P) z$ Q) P5 P3 j set my-column -1: c" y: X! Z: A0 {6 c6 ]
set my-phase -1
) ~0 G: X) z2 P set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
% G, L+ Z0 \' z$ A" ~' Q9 `3 W set roads patches with" q+ {* Y' g3 e' I+ ^- U0 X8 |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 Q, }/ J9 o& i2 @/ E4 t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 {0 _" r8 F Z. P set intersections roads with
. a# ]. P1 E d @! e [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and2 P% O. I! W6 U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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9 s) h& ~2 y4 I4 |2 u ask roads [ set pcolor white ]" G& f e& L$ B* v
setup-intersections
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1 V( M, ?: x0 S其中定义道路的句子,如下所示,是什么意思啊?
# ]3 [0 N: V4 @; s7 a set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, a9 K* ?+ l8 @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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