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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。
( I: O7 _2 y( g- Z+ T* X i) |# k1 dnetlogo自带的social science--traffic grid这一例子当中,
" c8 G2 v% J; w- Cglobals) ? z$ { p/ U
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grid-x-inc ;; the amount of patches in between two roads in the x direction+ a" Q9 j- u/ K( b2 \
grid-y-inc ;; the amount of patches in between two roads in the y direction
4 b. [) X( V# x2 b acceleration ;; the constant that controls how much a car speeds up or slows down by if
# M* w% g/ |) _- J6 f' D- p5 t ;; it is to accelerate or decelerate: s+ i' e6 G. g: v
phase ;; keeps track of the phase4 W% i& [* P4 U( m) B! \( H4 q M
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
- R( X: [* g7 G( _ current-light ;; the currently selected light/ I# p7 @9 o0 I, L8 f9 e c
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;; patch agentsets: W2 L% r- U y/ Q* j# @
intersections ;; agentset containing the patches that are intersections
9 n5 y1 y! G3 y0 e$ b roads ;; agentset containing the patches that are roads" [) e$ _% A8 ~- z! V2 _
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turtles-own
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speed ;; the speed of the turtle
/ K! c O2 M1 F) k# i- C9 r up-car? ;; true if the turtle moves downwards and false if it moves to the right% m7 d5 E* _& F" v5 g
wait-time ;; the amount of time since the last time a turtle has moved1 p1 f0 U6 k ]- \
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patches-own
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( p3 s! S t* `( V: C. D0 Z intersection? ;; true if the patch is at the intersection of two roads
2 d+ [' W' x) _/ Q, r; \ green-light-up? ;; true if the green light is above the intersection. otherwise, false.1 o' E% F. _5 e
;; false for a non-intersection patches.
/ p } O; d) y my-row ;; the row of the intersection counting from the upper left corner of the
( V2 j4 l3 x4 | ;; world. -1 for non-intersection patches.
' o- ~! E" _. h: ?* M7 {9 p my-column ;; the column of the intersection counting from the upper left corner of the4 v K4 U# }4 m: x
;; world. -1 for non-intersection patches.2 N: h* e% w6 T+ z
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! j1 n' s* n$ u$ m' e$ U3 o8 ? auto? ;; whether or not this intersection will switch automatically.
; I$ i6 B8 m4 D" y+ {$ E C ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;. p, v9 Y' }2 O: ]# T0 M
;; Setup Procedures ;;2 f2 q$ _6 A2 u+ L' u8 A
;;;;;;;;;;;;;;;;;;;;;;
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) d( Y/ c$ x4 S5 b;; Initialize the display by giving the global and patch variables initial values.$ d" p! v' \7 Q2 l6 W/ h
;; Create num-cars of turtles if there are enough road patches for one turtle to/ r' M* K# q- t- K; A, P
;; be created per road patch. Set up the plots.
* ~# a, V$ N D) Qto setup
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4 |2 U3 y$ X0 h2 X3 J+ ^" j) H setup-globals
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9 y. f6 @ r5 X ;; First we ask the patches to draw themselves and set up a few variables W3 {0 e; y. I; W J
setup-patches6 I% I- m7 h4 S6 b
make-current one-of intersections
8 ]- ?) H4 @3 ^" X* ~6 t$ [7 d label-current# ^6 y/ T* G! Y/ f0 _$ t1 z
9 {% I( u$ D. N, P/ z/ q* Q( r set-default-shape turtles "car"4 a" D- g0 u4 D
5 _0 t5 f* t1 r+ y. X, Y if (num-cars > count roads)- l1 A* U0 P% m Q; ~% s
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user-message (word "There are too many cars for the amount of "5 ^; x( J8 M, U! d2 s% T+ {3 [) q
"road. Either increase the amount of roads ". S% g" {4 |' b0 J' d9 X
"by increasing the GRID-SIZE-X or "$ E8 B" g: U6 X! x3 G) T
"GRID-SIZE-Y sliders, or decrease the "
) Z W9 a) R5 J; h' P. H "number of cars by lowering the NUMBER slider.\n"- c* j/ l7 b3 k$ V; j! h
"The setup has stopped.")# `9 k- Y, O$ V# e; f; B8 ?
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 D: M6 |- f! ?/ ` crt num-cars9 c2 N5 K( X( i
[
8 {; K0 }6 I: x$ A9 j0 W8 }+ W+ m* C" ? setup-cars
+ ]5 S1 b( Y7 s- E( c set-car-color; U; L2 @4 P7 j- j, R5 \' U
record-data
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2 N, o7 ^( I3 ?4 a. Q/ ^! z: w4 f, S ;; give the turtles an initial speed1 ^* z1 r# v( @; ^" w) F& e
ask turtles [ set-car-speed ]
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reset-ticks
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& d( B: D$ H9 `9 m# a/ i+ |& Q; z* o;; Initialize the global variables to appropriate values- u, L9 K, k% L) Z8 E
to setup-globals
' b) f: D5 p: V5 L) t8 S set current-light nobody ;; just for now, since there are no lights yet+ S2 c' g/ F6 ]) `
set phase 0
" k; U' }/ V) w% b set num-cars-stopped 0
( I- T3 W9 m' Q z8 J, { set grid-x-inc world-width / grid-size-x
# c' t: M9 _2 s9 C6 i! F- l. a" x& ? set grid-y-inc world-height / grid-size-y
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c( _1 |8 d: d+ ~6 P: ?8 X& q0 t ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: Y: }: W+ S2 m, B+ f Z- M: j
set acceleration 0.0990 c, d7 U2 [: I: M
end5 Q9 q* e$ _2 R& |. t* b D. o
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,! P/ v+ W! D0 b6 Y0 K
;; and initialize the traffic lights to one setting. e, ]& r8 U4 W# J5 W% M
to setup-patches# E8 ~# u" v" Y- M
;; initialize the patch-owned variables and color the patches to a base-color
: N" N b& t: e o% @' } ask patches
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- t# L) P5 _; S& U6 m# D set intersection? false& l) P( o5 l" D2 w/ Q
set auto? false
" C9 P+ I) b1 z6 k' K set green-light-up? true
$ o, s& D7 K# x+ B* G9 \ set my-row -1
+ P& S( Q0 ?% u U6 k" e set my-column -1$ f* I) n3 s* ~4 g' V1 p" i
set my-phase -1( U g0 \8 A/ B) Y m" R' i$ B
set pcolor brown + 3( a2 W! s9 j$ O2 `" {" T
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;; initialize the global variables that hold patch agentsets2 R/ ?; B3 b) F
set roads patches with
( r, b" ^8 l2 X. n4 j& B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 h; |& j7 Y) y' p4 A( o
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 H# ~* U, D1 } {& S set intersections roads with
; U/ v$ Y4 [ v1 H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ P* {1 b, y) \" C# U& }/ H (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 F5 U& k% B2 }" W X
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ask roads [ set pcolor white ]6 x, O5 L- s; F, [: z
setup-intersections, ~2 ~' b9 {) Z: _1 u
end
( m! `: o) m% f/ Q. U @0 f其中定义道路的句子,如下所示,是什么意思啊?
j" M0 y( i( i, P set roads patches with, }: i' p" F/ f+ y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 |. `. i/ d* {! n' r (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% m3 ?' H E6 l6 X9 P |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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