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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。
) a% r6 G7 G6 c* W) H# |3 K6 knetlogo自带的social science--traffic grid这一例子当中,
6 r# D/ Y8 d" J mglobals& u5 u Z; e0 c. L6 ?' n
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grid-x-inc ;; the amount of patches in between two roads in the x direction& L, D; \/ ` l# `# U
grid-y-inc ;; the amount of patches in between two roads in the y direction
0 q: k9 Q" f# ]8 r# m+ T' P3 a: f acceleration ;; the constant that controls how much a car speeds up or slows down by if7 i$ Y: k! B! l2 F1 [
;; it is to accelerate or decelerate' \- |7 k' t% K5 l0 W3 e
phase ;; keeps track of the phase' p. v" S5 Q% g1 S* Y
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure T6 C5 Q. K( m: e
current-light ;; the currently selected light) R; k( o! d5 i& c$ T6 O2 q8 _
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;; patch agentsets+ I0 w) w1 A* U% v( C6 w. _
intersections ;; agentset containing the patches that are intersections
% \. p! D8 U# j4 B- r- z1 p* |& V roads ;; agentset containing the patches that are roads
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; Q9 i) H, T q. ]: k Lturtles-own
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. n# G( o, f! t/ E" v5 A speed ;; the speed of the turtle( o" G8 I3 o- i; a$ K3 F F# s
up-car? ;; true if the turtle moves downwards and false if it moves to the right
8 L2 h1 f8 d; s+ p o0 w& E# k wait-time ;; the amount of time since the last time a turtle has moved
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+ U* u& j3 h& V$ Apatches-own7 ~9 X+ y7 S. }+ R( K& z
[
8 N; W& d$ q3 r intersection? ;; true if the patch is at the intersection of two roads7 M9 {6 \$ M+ b- W B5 B+ p
green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 \3 p9 `/ H/ j9 }/ s! Y1 U
;; false for a non-intersection patches.8 E/ ~# T0 I' X3 d
my-row ;; the row of the intersection counting from the upper left corner of the
7 _' ]. g" k0 g: G+ O; D, F ;; world. -1 for non-intersection patches.
* L% m- q1 M+ L# \ my-column ;; the column of the intersection counting from the upper left corner of the
* d* G6 n# `2 f- x! B ;; world. -1 for non-intersection patches.
5 J/ n5 Z9 |) J$ x1 U0 M2 y( G& q my-phase ;; the phase for the intersection. -1 for non-intersection patches.
$ B' K) ^/ N, E9 v auto? ;; whether or not this intersection will switch automatically.
& s3 ]1 A7 p' P# @8 @ z ;; false for non-intersection patches.
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$ t; I+ ~/ z% y' \9 m' S;;;;;;;;;;;;;;;;;;;;;;
- V. e; u! y& U' E" X, D. ]% H. |;; Setup Procedures ;;
3 S0 F/ S' ]3 d6 G- e6 |;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
7 I9 y7 y0 w, ]! m3 h;; Create num-cars of turtles if there are enough road patches for one turtle to9 M5 O9 S$ C" |4 X- ~! _
;; be created per road patch. Set up the plots.7 o- C& {" D0 r- }
to setup2 h* h+ f' v: _. R3 k' H2 k
ca
: t' w' D. G I setup-globals
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& T3 z2 @3 \' v/ e1 N2 U ;; First we ask the patches to draw themselves and set up a few variables0 Q. x9 p3 ]/ v5 U: y) ^6 p; d
setup-patches
& q1 {- x O. Z6 ?4 t* t3 y6 Z make-current one-of intersections6 k2 u6 P1 H2 P4 @+ @% F6 c% W
label-current
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set-default-shape turtles "car"$ X: w1 ^# b# w
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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 ". T s! z+ e! @- T N/ n
"road. Either increase the amount of roads "/ H. l4 C% j/ e1 W1 e
"by increasing the GRID-SIZE-X or "1 K) C6 z$ {/ W
"GRID-SIZE-Y sliders, or decrease the "% q' x# l9 P/ j9 n
"number of cars by lowering the NUMBER slider.\n": N: S/ f; ^1 V0 u1 l1 ^
"The setup has stopped.")! w8 {9 s& f" l7 i3 o5 }# z( a
stop
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: R' N s' }) \2 u& r ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color' q6 l" @/ v0 Y1 o) r6 D3 @
crt num-cars5 {" b2 [5 Y8 R$ _
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setup-cars* i9 Q4 O0 b6 d/ o6 D
set-car-color2 \" U7 Y& [1 H. O; p( F4 x, W) `! s
record-data# o7 o% K% k; a; B2 [# V
]
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;; give the turtles an initial speed
) ]! z8 i8 U/ }7 s: D ask turtles [ set-car-speed ]
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0 V. `; G" z& O, `, ~ reset-ticks
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;; Initialize the global variables to appropriate values
0 t& ~' R. [$ C% H- E" uto setup-globals( ?5 G$ ?; W# w) r; G# E
set current-light nobody ;; just for now, since there are no lights yet
) X. P5 T! O& J; P" u$ C3 v8 h set phase 0
" {0 x0 Q3 M. I1 R5 m& o set num-cars-stopped 0
1 S3 C3 q q' l9 j1 d3 I/ ^ set grid-x-inc world-width / grid-size-x* P( d% K5 w6 p( c& q/ x
set grid-y-inc world-height / grid-size-y
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5 i1 Y$ Y( M/ X6 D) k ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" Q' v+ k- M3 N. ~- G
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 Y7 i0 \/ r* g9 o; p! a# q;; and initialize the traffic lights to one setting
3 l: I: f+ l: w4 Mto setup-patches
1 |) D) R$ y" ^( S4 w+ [ ;; initialize the patch-owned variables and color the patches to a base-color- ?2 a9 k* W h E" M- R
ask patches
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set intersection? false. S2 i( P$ p# o: L7 I, q
set auto? false; z# i- C4 G* c F" w! b
set green-light-up? true/ H% T% g6 S9 b: r
set my-row -1
$ U+ d/ N/ M5 L+ i* m3 V# [) u0 x set my-column -1
/ k, R/ O7 h. p. y( Y set my-phase -17 `3 V) [$ ?7 h4 ?
set pcolor brown + 3) V4 ~' b* Z% G" v! Y% A
]
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;; initialize the global variables that hold patch agentsets
4 G4 k( y% v/ \9 n+ V3 K5 ^ set roads patches with
; o6 b- S0 o. v) r5 E* T% b9 j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 s5 J, _ g( q+ m6 _2 i1 }2 k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& U6 s+ x- ^% _1 W0 h set intersections roads with
1 f' w. r& P5 _9 M1 @" n' o t3 M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 X, ?1 y- W1 V8 a! L& _, H (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; ^# T/ s) R8 B; }1 y5 [
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ask roads [ set pcolor white ]7 a0 f$ F! a5 `) E% N5 k
setup-intersections: ^3 e' d3 P' A
end
' s- I, _+ s5 D7 `; z其中定义道路的句子,如下所示,是什么意思啊?
% r; p! { ~) S& _( x, s. z set roads patches with! s F% e% I ~3 [! m* ]+ O+ _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# U0 T* w. f# g0 h1 W: R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 e( W- k/ b7 t: V$ d
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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