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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。
; P0 f; p7 q" _% X) K2 b* hnetlogo自带的social science--traffic grid这一例子当中,
1 x) M7 r6 o1 `globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
% ?$ J# }$ z3 K4 Q0 ~$ } grid-y-inc ;; the amount of patches in between two roads in the y direction
. j4 B- A1 ^- k' E5 @! L/ i acceleration ;; the constant that controls how much a car speeds up or slows down by if Y- o \; _, n. A5 k) ^8 D
;; it is to accelerate or decelerate
- d, I! R8 ^9 J! R2 ` phase ;; keeps track of the phase
R) \) q1 ~ h num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure' J# m1 [+ M# f$ G8 [8 q' \; k
current-light ;; the currently selected light
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4 J) ~9 y, p% O* { ;; patch agentsets3 j' z8 \4 K, d, |. V; }# V
intersections ;; agentset containing the patches that are intersections& r* K r* W- e4 B( J
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle6 D6 R8 ?' Q% m) f+ m$ S
up-car? ;; true if the turtle moves downwards and false if it moves to the right+ n* U+ B. e3 c% s5 `
wait-time ;; the amount of time since the last time a turtle has moved
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6 Y" W. M8 G$ I/ f6 A' Tpatches-own G$ C, z9 [2 w; N0 w( w
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8 C$ e, k8 x6 I$ \( R/ V( U5 r intersection? ;; true if the patch is at the intersection of two roads
- j- p5 `8 z, B& J+ R& \ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- z! D5 k g! t2 g( ` F ;; false for a non-intersection patches.- x0 n2 ?6 Q! x
my-row ;; the row of the intersection counting from the upper left corner of the
; }8 }8 G- J$ V n! M ;; world. -1 for non-intersection patches. j. I2 z. I. A; |9 e3 d
my-column ;; the column of the intersection counting from the upper left corner of the3 Z4 z2 e; w/ h
;; world. -1 for non-intersection patches.
* ]% a% o& Z7 Y. z" v' T& g my-phase ;; the phase for the intersection. -1 for non-intersection patches.) s5 {: \3 o9 \! Y0 K q
auto? ;; whether or not this intersection will switch automatically.5 C4 u H) v( {: `" W
;; false for non-intersection patches.9 L y4 B( b$ {! f2 W" G' Y
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;;;;;;;;;;;;;;;;;;;;;;
- p* e$ ?9 N- i8 `( o: S;; Setup Procedures ;;
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- w/ R1 C/ s+ N9 ~1 i;; Initialize the display by giving the global and patch variables initial values.
- _7 J) l) u; V;; Create num-cars of turtles if there are enough road patches for one turtle to
6 t3 U. \* y) m( t;; be created per road patch. Set up the plots.
& `2 Z! q& i/ j7 }& bto setup
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setup-globals
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7 o# K2 b. X+ p0 M, e8 U$ F ;; First we ask the patches to draw themselves and set up a few variables
2 ]' i7 |2 `2 m& @- P setup-patches9 c: c$ s3 c) h( T! \9 J
make-current one-of intersections
& G( x: i, |+ Q" m label-current
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set-default-shape turtles "car"( h- @. V5 `; g S n" E
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if (num-cars > count roads)
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' r Q9 m3 Z$ O& A+ K1 s5 T user-message (word "There are too many cars for the amount of "
+ f& e, J, I! v" T! I# B8 _- H "road. Either increase the amount of roads ") K; ?3 `, a4 f* N+ i9 f" O
"by increasing the GRID-SIZE-X or "9 B) u! W/ N: H6 m
"GRID-SIZE-Y sliders, or decrease the "+ x$ S. \) ~) d
"number of cars by lowering the NUMBER slider.\n"
7 F g- N& |, c "The setup has stopped.")
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& T1 R7 W7 b' F+ k: }4 ? ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% c3 e$ u9 C7 @$ A! {1 ^ x
crt num-cars8 P" E- I0 d4 b e3 {1 k' h! J
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setup-cars4 X" [8 g, E8 j& ^8 ^9 u/ m1 ?) l1 L
set-car-color+ L3 T6 e. r' W- Z4 E9 W# z
record-data9 a; F% v' M* C2 G: r# I
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;; give the turtles an initial speed' }* W( r" `- q M9 A
ask turtles [ set-car-speed ]
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* C7 Q; Y8 T; D reset-ticks
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* F2 X* u6 w# `% ]4 O6 v;; Initialize the global variables to appropriate values, L/ Y1 ~8 @6 x$ S1 s( S2 h
to setup-globals
: u( h9 f, n. ^$ _2 [4 z. B set current-light nobody ;; just for now, since there are no lights yet
- s$ v+ S& C8 S& j1 F set phase 0
8 a. u' T, d m7 w& r set num-cars-stopped 09 W: `3 l' `( s4 t9 ?
set grid-x-inc world-width / grid-size-x
1 U) q, j' U5 N0 x0 V- O4 l set grid-y-inc world-height / grid-size-y0 q# `+ ~: u+ @) p2 k7 ?& M
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 z& v; J4 q/ E1 p8 x: P set acceleration 0.099! u+ w+ A+ w- v9 {8 \. g. J
end# w/ W2 u T* }' @
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. B6 P+ [- [; U5 u6 k+ K;; and initialize the traffic lights to one setting- n2 k) s1 j9 L8 S( G/ E
to setup-patches
* v7 P* r3 Q1 o3 L7 m h5 R/ V$ L6 c ;; initialize the patch-owned variables and color the patches to a base-color& F$ J/ t) `$ K, E( x; I, g8 q# S
ask patches9 u- ^/ N+ M; V/ r
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) V) o" r' B8 j2 S6 \ set intersection? false) f0 X8 M# |$ _4 X. |2 D
set auto? false
2 N5 g+ U# ?2 a set green-light-up? true2 }/ y* H) z( W0 D$ v1 t ^
set my-row -1 R* o& l, V$ l7 O9 K
set my-column -1( Q' M4 S2 P# z% p7 n3 h4 J
set my-phase -1' c q k6 @) B G5 [) {; h
set pcolor brown + 3
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; H4 o# @) m1 m3 x+ w. o& B ;; initialize the global variables that hold patch agentsets7 C' I* x: U, r
set roads patches with
6 i$ ^8 |# K) n; _. M0 H. @ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 `4 u+ p" n g9 q& o+ p$ Q+ |; ` (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ w1 ]# x7 _8 m* [7 `" l8 ?9 F set intersections roads with
/ |$ D$ [0 Q3 f* _3 E [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 u9 g' w( I- H (floor((pycor + max-pycor) mod grid-y-inc) = 0)] Z- m" }8 {) T0 `2 i3 e
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ask roads [ set pcolor white ]. w0 ]. j0 o+ g4 T1 X/ _
setup-intersections3 B( j E; ?, p5 d, v1 ^/ X, j8 Y
end
- X" {; R y# D( ` I其中定义道路的句子,如下所示,是什么意思啊?
+ _9 E5 B2 B; a set roads patches with& B8 _! T" @4 |$ E) Z$ w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% N! D; q w p( _
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 y' {: j: F% U" E; p c$ v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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