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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。$ W. |1 e! w$ Y6 v# d p' [8 ~
netlogo自带的social science--traffic grid这一例子当中,: u6 O1 M2 o6 ^
globals' @. @& h" B1 M3 a1 K# E4 a# f
[
7 t% e3 S# }8 P8 N grid-x-inc ;; the amount of patches in between two roads in the x direction
" U. B# C) \& h, o2 q; s# h grid-y-inc ;; the amount of patches in between two roads in the y direction
' l0 @+ T a2 @% ?/ b& f1 Y acceleration ;; the constant that controls how much a car speeds up or slows down by if, t7 b; l1 H5 }: B7 k/ B
;; it is to accelerate or decelerate
6 g, L4 F- O+ }3 ]" b: | phase ;; keeps track of the phase
0 F7 c& d" E2 c5 o8 j; i9 O- s5 m num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure4 e- a9 g n- J2 l+ p# h2 M: }8 \
current-light ;; the currently selected light5 k& _, n& \- V+ U8 @# ?$ f- d
& \+ Q2 i' d8 u ;; patch agentsets
" ]" C* E; C3 J2 Z( G" i2 @ intersections ;; agentset containing the patches that are intersections
5 A2 v; [) `1 \: n& H! p/ ~ roads ;; agentset containing the patches that are roads
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turtles-own
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5 ~( Y- k4 n z, U% G' s speed ;; the speed of the turtle: G3 T Z# D" l }/ e
up-car? ;; true if the turtle moves downwards and false if it moves to the right
, [5 M& k# p% ]* G% i# E# s wait-time ;; the amount of time since the last time a turtle has moved
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8 g2 ^1 P% _, O7 ppatches-own3 g9 d; b( P& R8 I8 d! M O5 R5 m' _
[2 s+ @% [6 G" B k! `6 y
intersection? ;; true if the patch is at the intersection of two roads5 A U s2 ~# I/ V8 ?0 D
green-light-up? ;; true if the green light is above the intersection. otherwise, false., I, a9 p( f$ m+ t0 ?- c& K
;; false for a non-intersection patches.
) D) X! e: t5 g0 {5 ~& ?8 B" f my-row ;; the row of the intersection counting from the upper left corner of the
, M2 b! ?. ]% D' [8 |* g) A ;; world. -1 for non-intersection patches.8 X8 v2 D5 v: p2 K% q3 S# T
my-column ;; the column of the intersection counting from the upper left corner of the- i; c/ z/ {# U4 [4 k
;; world. -1 for non-intersection patches.
* g( t: N9 G2 v# f& }4 t8 F; ? my-phase ;; the phase for the intersection. -1 for non-intersection patches.
) T( ?% F% ^; t auto? ;; whether or not this intersection will switch automatically., N( G$ c# a/ V5 R+ S7 A5 I
;; false for non-intersection patches.
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; C* i$ M; F" Y o f;;;;;;;;;;;;;;;;;;;;;;
/ g$ Q( R" o: U- Z; h, V# n;; Setup Procedures ;;
, f, `) i, ]! M- K- f4 q;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.8 W/ q, ^3 a& u% e
;; Create num-cars of turtles if there are enough road patches for one turtle to! [' A& P; O' ]0 Q
;; be created per road patch. Set up the plots.0 \. w7 Y, V" d7 \0 R
to setup
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- a/ E5 J. S, \9 N setup-globals
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+ M0 B: R3 c# n$ u ;; First we ask the patches to draw themselves and set up a few variables$ e ?* }7 f" e3 ^! K+ Z7 z- S0 A
setup-patches
: T& @# ?5 @- }- J5 z8 x make-current one-of intersections: H3 \7 o; K. e
label-current- ?* ~5 ?: p: I% i
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set-default-shape turtles "car"+ G& n! ^5 k) r# A0 N
! B7 M* f9 X8 n* @. r1 y k5 [ if (num-cars > count roads)6 ^# d% N: M- O0 g) y
[
$ }& Z# p" n1 f1 r7 G/ H user-message (word "There are too many cars for the amount of "
0 p- d. b2 K8 f "road. Either increase the amount of roads " [8 c% O8 |% j* N& c5 m* `
"by increasing the GRID-SIZE-X or "$ A3 m& [/ m4 G" q# }7 S( V& k
"GRID-SIZE-Y sliders, or decrease the ") y5 e; V: ]- t z, S* d2 C
"number of cars by lowering the NUMBER slider.\n": G2 J4 t: E9 e4 _- B3 V3 p
"The setup has stopped.")
. ?# t: T! \, p+ B. F: u8 r stop3 h1 N+ r5 E& D3 \
]
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- q7 A! d$ ^9 u* s ] ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- g8 L4 S% i7 j3 R3 W8 X- h crt num-cars% O. d9 J" _% V( r
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setup-cars
% R/ o& b4 d$ x set-car-color. d' G! Y! z# C: c& y
record-data
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* H3 e4 m* t- o. _1 M' e. Q ;; give the turtles an initial speed
5 R" o6 _. }. b% r# i+ D4 h5 }; s ask turtles [ set-car-speed ]1 S6 t- J& R H" ^
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reset-ticks* T1 [& N9 ^! s* Q" q$ [
end# F% k4 N) J' |2 e
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;; Initialize the global variables to appropriate values6 G4 G7 _/ o* w
to setup-globals
7 ?- m& s; f; x7 ?' y! k set current-light nobody ;; just for now, since there are no lights yet
& R/ B1 |/ @" z& ` set phase 0
1 w1 x. g( W" t5 N& y set num-cars-stopped 0+ t; b' j* F! V! b
set grid-x-inc world-width / grid-size-x
g4 x/ k9 \6 P! | 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
3 Q! S( J/ y" I2 a: o. | set acceleration 0.099
. g% x9 x0 F5 [/ I& \6 Z8 Q+ k8 }end
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7 }1 ^! V' E! y9 p; s" N. K;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
3 r3 l6 b% E k% j;; and initialize the traffic lights to one setting
' J5 U7 X* ~7 u! ?, h$ F5 V( x# Kto setup-patches
7 L6 O0 q1 z: H% e, d ;; initialize the patch-owned variables and color the patches to a base-color
7 y* H& [6 Z8 Y& I ask patches
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set intersection? false
1 U; C3 M8 h* M! U" } set auto? false" @/ o& G* J0 X$ |+ w- x" G
set green-light-up? true1 q7 A6 P' `' s, U
set my-row -13 }' I# [3 T6 n/ }
set my-column -1
: O& b6 [% N$ L9 Y0 e, j% r; _ set my-phase -1
8 I4 N+ ~; L8 n& K; l set pcolor brown + 38 f+ O4 @; c- d7 L
]
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;; initialize the global variables that hold patch agentsets- a$ B( E- |* F w* l% ^
set roads patches with- t- f" ^: b7 T6 e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
O) x& M: J5 d; i# ~2 Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 I) V9 N! o4 b# g7 r; N& ]6 z0 }9 ]
set intersections roads with
8 Q" d/ Z! `! c9 U9 O3 f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# Q1 e: U, C( r4 |: p, k1 e (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end
$ G0 b9 v- x* u1 P! j( Y- X/ ?其中定义道路的句子,如下所示,是什么意思啊?) N5 |! B% _9 v" o
set roads patches with3 ?1 J! {$ h2 ~& g! _( [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. s# g; Z- w* _! Y. U$ r: I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 S) T! i; H5 \
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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