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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。
2 W! i0 Z# I4 i& }- j* ]netlogo自带的social science--traffic grid这一例子当中,
6 M0 c2 @( K7 Z* Y7 r4 R Wglobals
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9 V1 t4 ]: |9 a grid-x-inc ;; the amount of patches in between two roads in the x direction* b. n6 h3 O' n% a/ R7 @+ x! g
grid-y-inc ;; the amount of patches in between two roads in the y direction% g ~/ |2 i `+ D( ]) N0 Z
acceleration ;; the constant that controls how much a car speeds up or slows down by if
7 c! h9 a- H+ j; F: s8 W ;; it is to accelerate or decelerate" U4 R6 `/ a. D4 u6 H- B
phase ;; keeps track of the phase
& N4 B1 P6 F8 A& x num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure' y2 |2 I- z4 k
current-light ;; the currently selected light! O9 C0 _& r8 I7 [8 A2 e
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;; patch agentsets
, ]8 N2 m: \) o% [ intersections ;; agentset containing the patches that are intersections
; ]+ f! E; U) K( b* H roads ;; agentset containing the patches that are roads+ m8 v& `+ C4 s- Q
]
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turtles-own4 ?. @! v' \- a6 e1 s. I
[
' y2 M5 v0 T9 B u+ T$ ^ speed ;; the speed of the turtle3 s" n2 z* y2 w }. v
up-car? ;; true if the turtle moves downwards and false if it moves to the right# s* E3 p% H5 `
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own! w' Y8 ?" Q* J; h: ~
[
( s, r z6 l& C intersection? ;; true if the patch is at the intersection of two roads
4 Z# t" W5 I9 x7 q, {7 h8 J5 | green-light-up? ;; true if the green light is above the intersection. otherwise, false.
: l0 C- b/ z, R' ]2 m! G ;; false for a non-intersection patches.
J; [# h( M' t7 |. d" g my-row ;; the row of the intersection counting from the upper left corner of the. y1 C, u6 C1 |% R
;; world. -1 for non-intersection patches.+ l, j# Y# Q2 a2 `7 c0 `1 |4 t
my-column ;; the column of the intersection counting from the upper left corner of the$ r$ Q! l9 y! s/ D8 r/ ]) y
;; world. -1 for non-intersection patches.
! m# M" g. j5 ?5 N6 ?$ C- [ my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" Q, E5 ^8 l/ r/ O auto? ;; whether or not this intersection will switch automatically.
7 B2 D5 C+ }3 k8 r ;; false for non-intersection patches.2 z* X+ K- K! v, N7 S* U! ~
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;;;;;;;;;;;;;;;;;;;;;;
% j9 Z+ E% n* V3 M( ]& [;; Setup Procedures ;;+ O) A1 c" M! j; }
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.( F# w- G8 F5 k1 r' z' M& z
;; Create num-cars of turtles if there are enough road patches for one turtle to
+ U/ P$ `; F, L;; be created per road patch. Set up the plots.7 f# k; D5 @( h4 H" d* x- N
to setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
, W) O7 J7 R+ ?' ? setup-patches
5 g- D. \8 h5 A! S+ x+ S h make-current one-of intersections4 q% B/ y0 P# |2 H" W1 J
label-current
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set-default-shape turtles "car"
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, i6 I8 O8 }" |; _1 ]' ?7 J if (num-cars > count roads)% ~: C8 Q8 y& Z n3 ~! k1 V& T
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user-message (word "There are too many cars for the amount of "
: x+ ~4 d# V5 }. S. [8 V "road. Either increase the amount of roads "
4 g( ^/ {7 Q1 m% A g* i- L0 C# Z "by increasing the GRID-SIZE-X or "
8 l v' Q! {# T" p; ]9 d "GRID-SIZE-Y sliders, or decrease the "
3 N% s) w# U. o5 a8 L& m' m9 h "number of cars by lowering the NUMBER slider.\n": u" o3 S5 U' {
"The setup has stopped.")
. S; X, L- X% ^ stop
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9 c7 X7 N/ {+ X" \) T ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ K) y9 F' w& [( J) a r crt num-cars
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& Q/ m4 j0 ?) k. q1 _* U1 ~ setup-cars$ `- i$ {% ]0 ^7 b' a3 ]5 ?2 S; F
set-car-color
6 W! ^% m: X$ @) r. f record-data3 L' ]* [* S; K! H5 b( W) r
]
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;; give the turtles an initial speed
K4 C& a. o/ S: \5 m1 z1 s8 a' n ask turtles [ set-car-speed ]1 |3 E" v, b$ V( |3 }& t" O3 s
6 E# o' P8 E$ M5 h reset-ticks, V$ u( Z2 T' r) d; m/ `1 t
end7 ?& A& D a* {, j s0 M) L* _) f
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;; Initialize the global variables to appropriate values
* u0 m ?+ d* v1 r2 Oto setup-globals* H1 Z8 ], q: r2 g+ n
set current-light nobody ;; just for now, since there are no lights yet
6 C; e9 Z1 d3 Y5 j: V+ x9 f! p( j set phase 05 [* `9 o) i) H& \
set num-cars-stopped 0. Q1 Z$ F4 m5 X# K/ e) W0 s
set grid-x-inc world-width / grid-size-x
: R' Q; ]& C; `/ R8 v! o 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 boundary8 Z8 n) E# z' d8 `2 |' J6 j
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ s# p5 ^0 E3 y7 G& S: \* r
;; and initialize the traffic lights to one setting e( p3 X7 c& P7 N$ z! S
to setup-patches
# z, z& F5 Z) {: i) F ;; initialize the patch-owned variables and color the patches to a base-color9 v3 A& U9 Q' P3 C" t- C/ S
ask patches; K! }: z% r! z5 z' q9 ~' `9 ]! J
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set intersection? false
" H* j6 W+ B" m# L, Y set auto? false( f4 \) x9 u/ z& T0 m o/ C( R8 E) t
set green-light-up? true2 q4 ?) F4 P% @4 r1 e
set my-row -1
8 O: C5 f4 w& ~5 [% Z: e set my-column -1( a" G+ ^/ ~# t7 _* }7 @: h
set my-phase -13 n% o' Z4 X: X* C
set pcolor brown + 3( C' u' \; B0 G2 K9 X
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; W9 C4 r0 N$ p! M5 l6 k ;; initialize the global variables that hold patch agentsets
2 W x$ v9 z) k set roads patches with
8 ^0 S5 [ L$ G* ?/ C [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ `! ?; ]# J' U. q# Q5 q" P/ I j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% [; L* B( B2 E4 b1 d set intersections roads with
' j6 o- M3 h W. Z" U/ J, A+ r [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 Y* h+ k0 K' C6 N5 p6 y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. H9 i5 m+ V7 I7 H
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ask roads [ set pcolor white ]: h5 f: k& h' w3 @' R3 N5 B
setup-intersections8 ]3 P- K. h" u, K$ D. c
end
) ~6 c) d! j- y1 W& b. {. D其中定义道路的句子,如下所示,是什么意思啊?" ^( w) r. z6 F: l
set roads patches with
3 F) n2 e* e( m; v [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# `: ` b6 q) R5 F; f
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- V% i/ G; q% j/ z1 a' g& X7 ?% g
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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