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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。( ^- q( T j+ `
netlogo自带的social science--traffic grid这一例子当中,) r4 t" y5 j$ X5 e; u& z
globals! T. `; B/ _& B
[
% H! M2 Y ]# ^3 n, J% U1 h grid-x-inc ;; the amount of patches in between two roads in the x direction
; t8 T. F* S4 ?; |; Q grid-y-inc ;; the amount of patches in between two roads in the y direction
s2 t Y+ _8 B acceleration ;; the constant that controls how much a car speeds up or slows down by if( ?( ~5 i8 { j9 b. G }
;; it is to accelerate or decelerate8 d' _9 |8 O4 ?# u2 L% D' p
phase ;; keeps track of the phase3 M8 Q N( {8 R z/ i
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 P E' U& Z" L* }7 Y
current-light ;; the currently selected light4 C! L6 ~( g" S
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;; patch agentsets9 r) [1 d3 I* H0 _
intersections ;; agentset containing the patches that are intersections
4 @5 @) {$ w) J+ P6 s+ n roads ;; agentset containing the patches that are roads
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turtles-own) Q/ L0 y- |& _+ d
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speed ;; the speed of the turtle" Z1 P# L3 z" l% _! t" f
up-car? ;; true if the turtle moves downwards and false if it moves to the right
% M: B) F j8 Z6 B& m o L+ I7 E wait-time ;; the amount of time since the last time a turtle has moved
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patches-own Z$ j0 C- @+ w- C
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1 n4 m- p, E* ~( v" c intersection? ;; true if the patch is at the intersection of two roads
7 j& P% g' L* {4 t green-light-up? ;; true if the green light is above the intersection. otherwise, false.
/ c! A' U# F7 Q7 ^3 Q3 e: a7 T ;; false for a non-intersection patches.& z- [% R& M( ]
my-row ;; the row of the intersection counting from the upper left corner of the( r# o. ?: C/ _
;; world. -1 for non-intersection patches.! A0 [* j9 `. o( M) R( |3 m1 U- G
my-column ;; the column of the intersection counting from the upper left corner of the2 b. X" T8 e' S: U0 g+ i& T0 e
;; world. -1 for non-intersection patches.0 f8 f" w" ]' D% Z
my-phase ;; the phase for the intersection. -1 for non-intersection patches.: ^" _3 m/ _7 j) K' {% D0 d
auto? ;; whether or not this intersection will switch automatically.* d4 q2 a5 w5 s
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;. Q1 _6 V7 c) |! L) A
;; Setup Procedures ;;
/ D8 m6 P: y7 a. z;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.& D. u' U f0 l) G
;; Create num-cars of turtles if there are enough road patches for one turtle to6 V" G1 p' @$ V* O
;; be created per road patch. Set up the plots.
- E, A. X$ ]3 l. U* r1 o1 V+ Zto setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables- {1 v4 b/ a R: K3 C' G4 m0 N
setup-patches. I' N; C2 V% J) ^$ X. V; y
make-current one-of intersections W5 N: N8 d; L* s8 ^, w
label-current' k, M) j( A, \ i+ Z
1 W P1 q2 E* S3 m- C set-default-shape turtles "car"
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% ]) F& |' X4 K9 X7 l2 n( f# M if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
& H. b) ?: A; x! ~: F "road. Either increase the amount of roads ". m2 r! k8 R; [" j
"by increasing the GRID-SIZE-X or "
1 h/ T6 w- D: P3 x4 Q3 ~( Z "GRID-SIZE-Y sliders, or decrease the "1 j1 k2 g1 q" o3 z
"number of cars by lowering the NUMBER slider.\n"0 T+ B3 ?; A A5 w
"The setup has stopped.")7 ~9 [' M4 A& l P! ~4 d
stop* p: o1 q9 y2 G) h
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" Z9 O, Y2 B% U" e0 N% b ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 [# @/ U4 Q5 R/ u- P
crt num-cars
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setup-cars8 P N; b) U3 G6 O" e) X9 f
set-car-color
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) o3 x$ o% t+ o% G/ i$ A ;; give the turtles an initial speed7 [+ C& y. p' \: U/ C
ask turtles [ set-car-speed ]
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5 K3 I! S8 y6 g- q8 [ reset-ticks
+ o/ k3 I8 J/ nend: s k2 x& B5 k
6 o' l# N* c$ ^2 `( J- k;; Initialize the global variables to appropriate values& F( j, D) N6 q; ?$ M* d
to setup-globals+ a: m8 [/ h! g: d
set current-light nobody ;; just for now, since there are no lights yet! L5 g% K" T8 j$ [3 T
set phase 04 R% o9 @: S4 F8 _
set num-cars-stopped 0( ^! G# u7 I9 t7 p/ ?
set grid-x-inc world-width / grid-size-x
$ K5 h4 E2 @7 ]6 U4 E9 S 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 boundary0 k. U9 h% p) C- X% T0 e5 h
set acceleration 0.099
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& i2 i) Z$ @* c0 M$ g9 y7 H( J3 n;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 E; Y* E w2 u% K& P/ H4 d! @* S
;; and initialize the traffic lights to one setting
: h+ P; g2 s8 Y; U. a( w0 Ito setup-patches9 d# ~8 u2 ]# X
;; initialize the patch-owned variables and color the patches to a base-color1 t! G Q+ D, d# S
ask patches/ `, O9 d% T/ B
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7 u! ^6 u) X6 X' s+ m3 @+ S2 Y; ? set intersection? false
4 z6 `) ?* ?4 U6 P set auto? false& L9 t$ `1 o( e2 b
set green-light-up? true
* x6 p3 Z- J: W# Q. Q! W; V$ d, t set my-row -15 v) j* A/ A" v2 ]2 {
set my-column -1* A' y1 a4 N _2 s) D: V, Z
set my-phase -1+ x3 ?; k2 J7 L1 I3 C0 J+ M ?4 Q7 G
set pcolor brown + 3& w9 R/ m# {1 E( I( @
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;; initialize the global variables that hold patch agentsets, \0 k+ K% J" A/ N3 {9 F
set roads patches with
+ v, G/ C$ `! v' P) g8 d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! X$ p9 V5 l F1 \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% h4 L7 ~( }+ a) k) e. I
set intersections roads with" z6 D/ S, V+ O3 T; G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, V# ~+ i1 ?8 r8 H) S (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
$ r, c4 W# T8 r setup-intersections$ E2 E; b3 e3 j2 E
end
1 h1 @$ s/ h. ? ~0 h* i其中定义道路的句子,如下所示,是什么意思啊?+ N; q+ W" a& F4 V; B
set roads patches with) k" b* Z9 k# u8 t
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% ^' b/ o5 ]& ]! Z, [% A- t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 R0 d7 J# ]" D) S) u8 x$ Y" d9 A; ^
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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