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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。; J! ^, V( l) O1 [: i
netlogo自带的social science--traffic grid这一例子当中,8 {# S. F# Y' M- h2 T8 \6 g+ A
globals
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( A! |4 @8 t' w$ Q- C/ Y grid-x-inc ;; the amount of patches in between two roads in the x direction; p4 R- U o. ?& D) A
grid-y-inc ;; the amount of patches in between two roads in the y direction
& G7 c7 v" H/ X) y. }3 k acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 ^: Z2 h0 v$ t9 ?% q ;; it is to accelerate or decelerate: v3 m4 o. i" L' c# v, n% ?
phase ;; keeps track of the phase
+ J* |9 E2 x7 |$ `0 D0 X num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure' K; L! M4 y* u
current-light ;; the currently selected light
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) S2 C- ]& v3 _/ |% p4 C/ } ;; patch agentsets
5 l8 g0 b* E! K. S intersections ;; agentset containing the patches that are intersections- G. v* `6 i0 i# \/ o0 U
roads ;; agentset containing the patches that are roads
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turtles-own4 p: o9 B' A' {
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/ V D5 }) d& s" T1 | z speed ;; the speed of the turtle* P: d" Z n+ M1 Q2 B
up-car? ;; true if the turtle moves downwards and false if it moves to the right
9 U3 Q3 v; Z) B* W- Z wait-time ;; the amount of time since the last time a turtle has moved: ^+ {2 b: ~9 t: q* n
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads- E6 Z% e- e5 F
green-light-up? ;; true if the green light is above the intersection. otherwise, false.8 A- f' b# u( r5 p
;; false for a non-intersection patches.+ z9 i# _# u3 A8 b' }
my-row ;; the row of the intersection counting from the upper left corner of the
* q" H" r: W9 x: w0 q' Y) S: K* ` ;; world. -1 for non-intersection patches.
( O3 U# S0 s9 h my-column ;; the column of the intersection counting from the upper left corner of the& R c2 R, L. H/ ]) ~7 G! x F# q
;; world. -1 for non-intersection patches.
I) O4 j$ ?( @# v; R my-phase ;; the phase for the intersection. -1 for non-intersection patches.3 p8 F8 v8 W, H8 [" h" j' z
auto? ;; whether or not this intersection will switch automatically.8 h1 H/ l$ [$ ~, t! @# |
;; false for non-intersection patches.# f/ \! W$ F! ]& w: o/ p
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;;;;;;;;;;;;;;;;;;;;;;$ ^& Z/ Q2 H$ @# I
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.4 `1 o' s, S- e( P+ @
;; Create num-cars of turtles if there are enough road patches for one turtle to
. l/ ^" Q$ D0 Y8 X( d;; be created per road patch. Set up the plots.
! W+ u J9 }" a% j2 {, d0 }; yto setup
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0 J @' G6 u# C: p. Q) w setup-globals6 w* k, l6 i6 [( s& m
$ }6 X/ X E0 P8 y: y, [ ;; First we ask the patches to draw themselves and set up a few variables
2 c1 y- O! u" D5 V8 G, D) y setup-patches
# q0 Z# }! J( z6 n make-current one-of intersections; a B: A; `# D; R) k8 [
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)
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! _$ X" S! C/ Q3 ] user-message (word "There are too many cars for the amount of "
4 \2 ^, s6 G$ G" x) e! ~3 E6 J "road. Either increase the amount of roads "
7 \% m, N0 J/ G! @; E" |7 B "by increasing the GRID-SIZE-X or "6 S4 U' E% t. M$ t
"GRID-SIZE-Y sliders, or decrease the ". {, a% W- P& @9 [# r" U+ N0 R
"number of cars by lowering the NUMBER slider.\n"
0 ~9 W) L) c* p* p0 Y. {& o "The setup has stopped.")% f: x( ^/ |3 D( p! M
stop; t; C1 G# r+ D: R S! j5 `, f* P/ \
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color, M/ o' E$ z( \& \- t* ^ F
crt num-cars! w! Y# W4 ]" _9 H8 V8 ^3 Q$ b
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set-car-color
: ]* i" P; H6 S, J' S! E1 h record-data
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2 R6 {8 h; k0 z% {& F u9 Z ;; give the turtles an initial speed
# K" \! V5 i. L. H! D9 s ask turtles [ set-car-speed ]
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reset-ticks
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+ |7 j' X% n- r5 n: ]0 d' b;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
$ y5 U* ^ j% i: t1 u! o: S( H* q' n/ g set phase 0, z! J# \1 r; k/ f% l# i$ J' j, F. L
set num-cars-stopped 0
C* Z; j/ B( w; a& U9 G, P" N, } set grid-x-inc world-width / grid-size-x
8 ]! d( _" k/ U1 W$ O set grid-y-inc world-height / grid-size-y) D9 P; {3 v7 P) E5 d: `
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
, g8 r' ^" q0 x% {- `" Z9 \: f set acceleration 0.099
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/ ^$ G/ c* U9 V2 d;; Make the patches have appropriate colors, set up the roads and intersections agentsets,3 }) L/ ]; x C9 x, ^; r
;; and initialize the traffic lights to one setting' b3 P) i5 @& F
to setup-patches: x* T: e9 L$ k- ?
;; initialize the patch-owned variables and color the patches to a base-color# ^2 ~. ?0 o. r: S3 v
ask patches
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* t' O3 S9 c" a& G; Z set intersection? false9 C5 I9 W! p2 d& X: p! D9 ` ]
set auto? false! s$ Q& D# }3 {' M) V
set green-light-up? true8 Y u# a" A( P& S; J
set my-row -1 T. T" r1 X1 o4 G9 Z% v2 R
set my-column -1
4 t! }& V0 o C/ z9 b set my-phase -1
3 W- f4 L' O+ f& Q set pcolor brown + 3
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$ d, ?1 A: s3 q+ V" Q ;; initialize the global variables that hold patch agentsets. ]- w4 n/ Y3 K3 T2 |7 y
set roads patches with! J9 n3 o P: n/ x5 x6 i6 c' M6 l
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ z6 Y- K' p% X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& N4 F( p% p+ I* P+ U" A$ B- a set intersections roads with0 F3 S+ U9 T: L; [- t( j1 c
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; z7 |/ @! N3 X) h- d (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 @8 w* h# d8 }5 Z
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ask roads [ set pcolor white ]6 a1 ^. Q) S- l8 G: x5 @# G8 u( t, j
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?3 k$ K/ f9 K8 Z6 ^7 f
set roads patches with
/ C. M+ x+ F% f7 ^+ a3 B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( \2 ` F5 J# Y$ T) P( @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 c" A( i) Q. x4 _' |
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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