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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。7 d+ K5 r. S5 J9 G6 C F4 m7 r
netlogo自带的social science--traffic grid这一例子当中,
@: f9 o; o' M* [: j) Bglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction6 S6 ?1 I* L' p3 ?
grid-y-inc ;; the amount of patches in between two roads in the y direction
8 z J$ u O' u- \! U7 Y0 s8 l acceleration ;; the constant that controls how much a car speeds up or slows down by if
, l/ e' A, N& w. a, s S& o ;; it is to accelerate or decelerate
; F4 K" c, x, u6 G* e p phase ;; keeps track of the phase9 y% C5 y1 C/ w+ g; v0 ^0 c
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure" \9 W& ?5 Z2 ? t* w- s
current-light ;; the currently selected light
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;; patch agentsets
4 g: }) i0 T" g% S intersections ;; agentset containing the patches that are intersections" _" C' E7 b; x
roads ;; agentset containing the patches that are roads
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turtles-own
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( R9 v9 q! j8 I, w% M! W- g4 n; a9 L speed ;; the speed of the turtle
9 W! z7 ^- I" S9 y up-car? ;; true if the turtle moves downwards and false if it moves to the right
, B- \; m1 U/ B4 i* \4 l5 L wait-time ;; the amount of time since the last time a turtle has moved
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# X. z- B* M4 cpatches-own8 S% d: Q9 e) h3 Z. X' J8 X
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intersection? ;; true if the patch is at the intersection of two roads6 y4 S: w8 f1 D% S$ ^; r6 @" P
green-light-up? ;; true if the green light is above the intersection. otherwise, false./ E7 [9 C+ N1 C8 X4 d" {3 l
;; false for a non-intersection patches.) _$ k' c( N* ]8 U+ q1 A0 t
my-row ;; the row of the intersection counting from the upper left corner of the& Y3 R. E0 i# t/ }8 L
;; world. -1 for non-intersection patches.7 _3 R# W5 p0 |8 Y
my-column ;; the column of the intersection counting from the upper left corner of the' n" T/ J* }) s7 v5 f- @ T
;; world. -1 for non-intersection patches.
! [8 x9 X# U7 \$ g; H my-phase ;; the phase for the intersection. -1 for non-intersection patches.
, b0 L3 _- U Y2 g auto? ;; whether or not this intersection will switch automatically.9 V$ @. y2 k9 M$ ~: ]
;; false for non-intersection patches.
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3 V# g7 l8 l6 x- ?- ?" e7 K' M;;;;;;;;;;;;;;;;;;;;;;
# P6 g: {9 u' v. W k6 ]9 \;; Setup Procedures ;; j& q* ]2 V& G* M
;;;;;;;;;;;;;;;;;;;;;;
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* j: H1 h1 L' }6 Z4 v. F;; Initialize the display by giving the global and patch variables initial values.
, M9 M, o: e) i3 m: ^0 v4 `;; Create num-cars of turtles if there are enough road patches for one turtle to
" w) U( H T7 L: F4 C;; be created per road patch. Set up the plots.
. M* m, q5 f7 h& |3 xto setup! k" B6 e6 V% X/ ]) h8 q
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setup-globals# V. S. c# P5 \4 a
+ b( M1 x; W3 F$ F2 J$ K& q( K ;; First we ask the patches to draw themselves and set up a few variables
1 b- t, O8 {7 K) R- W setup-patches, r8 s8 t) [" }2 ^9 E4 Z G
make-current one-of intersections; F5 C0 J) l" F: p0 f
label-current( h# j* }* }$ {+ a, o3 w
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set-default-shape turtles "car"4 X- h$ F$ s$ W' f! O: |# G$ ?9 }. S
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if (num-cars > count roads)
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4 U3 z, n4 Y( s) E" |1 j user-message (word "There are too many cars for the amount of "
c* |' F; u9 l: B% v/ m "road. Either increase the amount of roads "! t! }% c& b0 R$ S6 t$ O
"by increasing the GRID-SIZE-X or "7 W" g6 U+ h! \% u4 ?
"GRID-SIZE-Y sliders, or decrease the "
; i, @, S& Z* q1 T/ w# L! ]$ y "number of cars by lowering the NUMBER slider.\n"
; r! a( e0 K) v- J4 T, H "The setup has stopped.")- z1 Q9 _0 ?4 x# }6 s
stop$ p6 y& W3 ~# R3 X% M* T
]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 ~* J; u- V. v0 D$ Z crt num-cars
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setup-cars
8 P+ J5 N& P* t4 @, z set-car-color
# B: J" P) K6 |' \6 l record-data
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8 R6 Z8 y# Q3 ]" O6 j" @1 o+ P" U ;; give the turtles an initial speed
& }1 t+ ]7 e0 j; n/ ] ask turtles [ set-car-speed ]1 k# o8 s, x! g$ {& ?) L7 f3 I
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reset-ticks9 K2 P$ E4 S7 g* [0 j! E+ c/ u c, u
end
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1 I0 f% r) V% R! v6 S;; Initialize the global variables to appropriate values
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. e( {" f+ m0 E. V' g set current-light nobody ;; just for now, since there are no lights yet! {0 y B; a8 m. Q L5 k) v
set phase 0. ]/ A3 p" y( N/ P2 A
set num-cars-stopped 0; o* g# J8 m; e: M6 r. x
set grid-x-inc world-width / grid-size-x$ h, z4 l9 ^5 F/ H/ y$ K
set grid-y-inc world-height / grid-size-y1 `! H8 E% A) e, L
; e" k7 d" b: T4 O5 x. b ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' p0 G; e L5 d+ T4 Z set acceleration 0.099) C, S7 d) K; d0 h, P; r
end( D; x! @1 }; D- j! g
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 @" {1 H- T3 y;; and initialize the traffic lights to one setting
* |: H1 ^2 {+ Gto setup-patches
. W. p; t! b1 g/ p1 e7 ~& p: L ;; initialize the patch-owned variables and color the patches to a base-color
% D, V1 y: s4 u# \ ask patches( P5 p! z, u; o$ L( ?: C8 m
[
; |" ~/ E0 c7 {" @9 f; D7 o set intersection? false5 _4 w6 ]- ^6 I, y! m5 e( ^$ V
set auto? false
" n4 {9 `7 |) \$ w( _ set green-light-up? true
$ B7 ^) p* J/ {+ ], v5 f) r set my-row -1
+ F c2 r: G) ]% j0 l/ h set my-column -1
" s* _- K! C, v# F# j) P7 n8 a( e set my-phase -1( b/ I( N/ Z7 [( |" `1 _% m
set pcolor brown + 3+ R2 ?5 {$ K4 b- {7 K) b" S
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4 k$ I+ C: }% j+ ~# [ ;; initialize the global variables that hold patch agentsets
- a# L2 o4 c l3 E set roads patches with
: C0 R4 Q$ y3 x" m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, V( a0 n; O& D( A. k0 t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 C0 U" g% |( N3 Y% b- X7 ?
set intersections roads with$ V& }' O7 X/ t6 D$ Y- q8 e: T( h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" l, q2 f& F I9 U/ p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]! ?. ^: ^& l3 P7 _! q- F" U/ Y. s" q
setup-intersections$ i3 g9 [3 u# }3 S1 L G9 W
end4 \2 {2 j% w5 F7 _( Z$ X" Y+ U7 I
其中定义道路的句子,如下所示,是什么意思啊?6 ?9 h, p- X" R2 N5 [% m# `0 L6 P
set roads patches with
( s9 H; x/ H! O* F7 m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; K- j2 [6 \$ w
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ I1 B4 s( W5 _% n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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