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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。
4 A7 x4 }" Q% A# y. |$ w3 Znetlogo自带的social science--traffic grid这一例子当中,. V0 ?) @- h& e. C
globals
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* e& x2 T0 w% V8 O/ a# ]1 `7 u grid-x-inc ;; the amount of patches in between two roads in the x direction
' J+ T* X% `* w: w grid-y-inc ;; the amount of patches in between two roads in the y direction; ]* A& e$ f5 j6 U& Z8 q% \2 o
acceleration ;; the constant that controls how much a car speeds up or slows down by if
+ J) \1 B: l9 N7 t1 }7 k$ ^ ;; it is to accelerate or decelerate8 z* Q7 w2 Q2 \
phase ;; keeps track of the phase
8 ^3 Q0 c6 m# G* q num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure2 @( T; q* |1 I/ o
current-light ;; the currently selected light f$ @' A5 c5 ~1 o# N
6 t7 J0 t a9 [5 u. F" g ;; patch agentsets$ C5 L O7 K8 A6 u, i5 G: ~
intersections ;; agentset containing the patches that are intersections- n& u1 z; _3 \, X; |7 U
roads ;; agentset containing the patches that are roads
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turtles-own
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/ D) A3 F4 C* n7 _ speed ;; the speed of the turtle
& r% j$ D( M+ ]- ~6 {7 J up-car? ;; true if the turtle moves downwards and false if it moves to the right
2 F/ @) w) D* Z& E, M7 S wait-time ;; the amount of time since the last time a turtle has moved" w( l5 ^" c. y0 M. N: v) y6 U/ C
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
) f4 ?. Q, B) K \, X6 z/ Z2 G green-light-up? ;; true if the green light is above the intersection. otherwise, false.2 B- M* V, R( H Y1 \* R
;; false for a non-intersection patches., g* M7 A/ n3 ]
my-row ;; the row of the intersection counting from the upper left corner of the
% t, E+ y& E3 X' }. P ;; world. -1 for non-intersection patches.% d/ ?" L& j1 B$ W
my-column ;; the column of the intersection counting from the upper left corner of the
, S6 ]( p R+ D. P2 \ ;; world. -1 for non-intersection patches./ }: q& ^' G8 O) j$ c
my-phase ;; the phase for the intersection. -1 for non-intersection patches.4 w; K7 ]: V K5 h+ c$ z+ v4 B
auto? ;; whether or not this intersection will switch automatically.
4 I0 T& \) N" N ;; false for non-intersection patches.4 M8 q* n5 x6 t" U" C6 ~0 J7 H9 S
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;;;;;;;;;;;;;;;;;;;;;;9 K0 V4 u3 b2 |! [" s
;; Setup Procedures ;;
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3 R( t& l# F, {4 m% T;; Initialize the display by giving the global and patch variables initial values.
9 P. M# p+ t1 K: [/ P7 u3 p3 l- M% Z;; Create num-cars of turtles if there are enough road patches for one turtle to% Z# W, |) x2 N4 m9 G+ k
;; be created per road patch. Set up the plots.$ W$ e* i9 L& P& z' Y2 c7 ~$ K
to setup1 R- [! v1 l. f9 H4 i \
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setup-globals5 Y) f' @/ S8 m3 T
1 J. R( ]5 {0 K; C3 r& i8 O. ?9 r ;; First we ask the patches to draw themselves and set up a few variables
^" a3 v4 ?4 f# }# z setup-patches0 d/ x$ w; K- L/ F: A( P
make-current one-of intersections- x: B7 A9 d0 o1 X3 E
label-current9 b! R& X8 |+ n) A( I
6 ?. |0 d' a+ g5 }7 o set-default-shape turtles "car"2 q4 k& s6 Q9 o6 E3 R" _3 j0 N
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if (num-cars > count roads)4 U" V& g/ d! W2 I
[
; g6 o% v. _1 A7 T user-message (word "There are too many cars for the amount of "1 N8 T/ U) \/ b' H
"road. Either increase the amount of roads "' _' n: n( h, Z0 H) D* K. `7 z
"by increasing the GRID-SIZE-X or "5 F; V" ?2 w( L5 L& I6 _; m/ B! v
"GRID-SIZE-Y sliders, or decrease the "0 a0 C8 d' D% [ J' g& v, V# m% R
"number of cars by lowering the NUMBER slider.\n"4 P1 {$ Q3 }# C2 i0 c0 k* c1 @5 C
"The setup has stopped.")# M9 G# o& K; a) t5 \9 d
stop
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7 M7 w$ G; `; ~: o/ S/ u- ~. R* _ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color. C' X: N J; `
crt num-cars9 B* Z0 b: b' ]# j7 g
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9 Y. j8 v8 Z6 J setup-cars
. |( e% Z8 ~3 U% @- v% R set-car-color1 E9 T/ _% @6 R$ s9 o
record-data" L# i6 u4 n9 e; c
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3 k5 V9 }* o0 g0 b* o ;; give the turtles an initial speed
& b1 ^ r9 I6 u5 F, j/ X ask turtles [ set-car-speed ]
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reset-ticks8 \, t0 j( a' R: } |$ U
end
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7 n3 f. h: a# d& Y& |& ?;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
% t/ \7 x) R* v- e+ l" c' H, ~ set phase 05 H! z$ b3 d k! X$ \ Y, g
set num-cars-stopped 0" m' ~+ D* w0 T8 u5 v, b7 T* M
set grid-x-inc world-width / grid-size-x
k' ?8 O( r1 L2 T' K 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 boundary% y/ w3 ?% V9 i, @& `
set acceleration 0.099, A7 @6 p" A* {( E5 v
end
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% a) b* R! d, F o2 R. j+ e;; Make the patches have appropriate colors, set up the roads and intersections agentsets," z) j1 v8 X+ P& K
;; and initialize the traffic lights to one setting
6 j' y* G' c/ fto setup-patches
- g8 y& X2 V6 f" b9 A9 ] ;; initialize the patch-owned variables and color the patches to a base-color* \* v* }2 J: p4 W S/ j8 G
ask patches
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3 p; B& d5 w* K* h2 O+ u' { set intersection? false9 @( Z2 P e+ j4 }0 Q
set auto? false; |9 `/ l8 d+ I' E7 N
set green-light-up? true
* t |2 g' q$ Q9 Y# x set my-row -1
/ ~) A6 W; L( \, a2 u0 B5 o( \ set my-column -1
; E% z/ ]3 I. u! T5 c set my-phase -1$ y. N6 e0 r/ ] `
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
$ Z( ]% _/ h' M$ S8 U- v/ W# l set roads patches with
) A: i p1 _* l) k3 P& t- W! [, T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 Q3 ^& s1 x3 t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 v( W$ [9 u( n: ]* c set intersections roads with
* Q) w9 `% l1 M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& t$ |$ s% I9 I" f- c (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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/ Z+ [5 @/ V: K6 X' U' @9 ? ask roads [ set pcolor white ]
0 ?8 L, W$ W n2 c 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?
1 T; t) }0 {9 e4 y: ? set roads patches with
# A4 B, F6 `3 Y ]. V3 j) r [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ @. d6 b( A! C' s, T3 l (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 \3 {1 Q4 U9 p) A4 i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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