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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。
, c: h2 Y1 H9 d" J) v% H$ fnetlogo自带的social science--traffic grid这一例子当中,
4 x$ y. ^! _5 [/ y* R. Fglobals7 Y( E- q8 R( s [" j3 M
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grid-x-inc ;; the amount of patches in between two roads in the x direction7 C' E5 k. K, H) D- T
grid-y-inc ;; the amount of patches in between two roads in the y direction
3 I" r, Z. x9 B5 ~- m acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 v8 l, k B7 {. e3 c& q9 U! a% t ;; it is to accelerate or decelerate/ b& u" s' L- |7 j
phase ;; keeps track of the phase2 T4 T4 s0 W2 y/ j0 R
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure2 _6 w# H9 D: r# H
current-light ;; the currently selected light
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d. v7 j8 g8 ]4 ? ;; patch agentsets; _+ b/ S" P) ]& g! }. K3 B
intersections ;; agentset containing the patches that are intersections; o ^2 u. U, y
roads ;; agentset containing the patches that are roads2 w& R5 N2 z! h( v9 n; B
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turtles-own
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speed ;; the speed of the turtle- l H5 k% R7 \1 H
up-car? ;; true if the turtle moves downwards and false if it moves to the right! @$ Q9 M6 ~( O* d
wait-time ;; the amount of time since the last time a turtle has moved
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3 u4 w5 O. v3 |! Vpatches-own- t1 q6 g7 s0 [, h+ V
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0 X' z4 e9 s2 [ intersection? ;; true if the patch is at the intersection of two roads
' s, a1 v0 S% E* O$ {; G green-light-up? ;; true if the green light is above the intersection. otherwise, false.1 C4 J0 @$ I2 ]
;; false for a non-intersection patches.
; q: Z9 a" S% o my-row ;; the row of the intersection counting from the upper left corner of the
7 b9 e% Q: E Y% S( l2 l ;; world. -1 for non-intersection patches.6 s+ g* f* R' B7 s! h2 d
my-column ;; the column of the intersection counting from the upper left corner of the
; o/ U5 y( L; P. p ;; world. -1 for non-intersection patches.7 ` N; M9 q) t
my-phase ;; the phase for the intersection. -1 for non-intersection patches.! Z# Z; ~2 e* V; r, b( c
auto? ;; whether or not this intersection will switch automatically.
8 X/ J2 |, {; F; m n3 `+ h* T ;; false for non-intersection patches.7 E( h$ r6 i$ ^' q
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;;;;;;;;;;;;;;;;;;;;;;
0 o6 z9 C% U7 b3 i. Z+ N# K;; Setup Procedures ;;4 I! G; T" I& f! p) B
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.7 Q# s2 b& \# r
;; Create num-cars of turtles if there are enough road patches for one turtle to
! c6 G6 P) p" d5 S# p A) h1 X;; be created per road patch. Set up the plots.
9 K% O3 }8 a% G% Y7 |to setup7 _0 r( a& ~/ f4 ]% l
ca
! g2 o$ l3 Q, P( H9 e setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
9 w; S5 Q$ J) h7 y+ i9 ~9 u3 S+ L: _ setup-patches9 z1 d7 f- h! k1 k& Z, z) J
make-current one-of intersections
7 R9 @2 d* M$ S" q( W) } label-current
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" u* h4 J P& g 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 "0 o0 g8 ^( z- X4 N, G5 H* F9 L( M
"road. Either increase the amount of roads "+ _& ~/ s: p" r- P
"by increasing the GRID-SIZE-X or "' }6 M; X. {8 ~0 b" N
"GRID-SIZE-Y sliders, or decrease the "2 ~" O/ I( z& ?" O
"number of cars by lowering the NUMBER slider.\n"
$ Q% \- O7 N. n( h/ T "The setup has stopped.")
, ~% ]+ J& d$ ^; [4 T3 s2 q! {: ? stop0 c- s* J" ]" [* Q) ^
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! w: o2 P/ h: l1 L3 o ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" ^1 U' i1 x; N5 I4 l, c
crt num-cars/ F5 [& A. V+ D4 L" C" ~
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setup-cars
; w" t! ]) ?- Q! h5 ]8 Q; J set-car-color
/ `4 E$ @8 P9 E6 p( X& n record-data* I1 H2 {' a- i, H. L
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( J N. \# X( N ;; give the turtles an initial speed1 X1 y3 b5 o( I, w, W! @+ V g
ask turtles [ set-car-speed ]8 u# e* y7 d/ ]; c' h8 y/ ^4 y
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reset-ticks. n% @0 [ k. E& _
end; R7 @/ Q7 ?5 I S. y5 K
6 @5 X! U6 W: W% d. _ M: P, M; F;; Initialize the global variables to appropriate values
! f" J# \% Z' n% R$ ito setup-globals) [8 s9 D4 ^+ d* T" u8 {+ v6 Y% O
set current-light nobody ;; just for now, since there are no lights yet' K7 g l& S7 X# e c# I& G
set phase 0
6 N L! F3 |, o+ ~0 V6 T" B% B set num-cars-stopped 0
' p2 f$ e5 @! g' {' q4 P: @6 m set grid-x-inc world-width / grid-size-x
* B5 l8 v5 K+ H$ T1 A" p6 R* v) ]+ U" N set grid-y-inc world-height / grid-size-y
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& @9 r; m+ c5 ^1 S6 \. M$ d! S, k1 _) V ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
& W1 M- R" C% F; [/ l1 ? set acceleration 0.099
( Q: t8 J8 V) A; l0 O" mend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, g" w- q/ M% X: J* i; c;; and initialize the traffic lights to one setting
& B* \) s* r- b5 p9 d8 o6 Yto setup-patches4 u) l! t2 V/ |# ?. _3 h
;; initialize the patch-owned variables and color the patches to a base-color
5 K0 G1 H! u4 Z ask patches
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set intersection? false
' |0 E1 D- c5 E3 O set auto? false2 b2 Y, u( R8 a
set green-light-up? true; I/ ]6 ^# l+ J6 K
set my-row -1
2 ~6 C$ E/ e, ?9 {7 n' _ set my-column -1
i( P4 U& \7 t; U, j) E( D set my-phase -10 y+ i7 u; }9 q; G m$ i& v
set pcolor brown + 3" J7 V' B& n6 g' {1 X( T, j8 t
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! b. \/ Y b5 R: P: R/ y ;; initialize the global variables that hold patch agentsets6 H& U* @, q; h/ O
set roads patches with# n1 v2 z4 J. x' C5 [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or R! H$ ~0 Q5 j! ]7 ~# r
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; w. z0 V: m: Q2 n0 \- T2 J) l I+ ~
set intersections roads with
% c# r! Y, G% F* e; z: J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 {1 y9 M6 H# N4 _1 o* J+ o ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]/ Z6 D5 r- ^ l8 b# F( c) b2 m4 {
setup-intersections! C& Z U3 O q+ i) e6 c* z, x
end
- l9 D8 R$ a0 Q其中定义道路的句子,如下所示,是什么意思啊?9 T& X0 P/ i" Z i! `
set roads patches with" ]$ S* }* I! Y r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 s% g5 a/ b( H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 w0 e% u# `# O, Q/ A# S& } S
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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