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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。3 r8 M! {0 m" Q) p5 x A
netlogo自带的social science--traffic grid这一例子当中,+ l$ v! z5 K0 l I- V+ }4 S
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& q2 k( H5 A# G% d grid-x-inc ;; the amount of patches in between two roads in the x direction
/ U S1 I g2 H# }5 h grid-y-inc ;; the amount of patches in between two roads in the y direction
8 h# p7 z! k( o$ J% T- L2 o acceleration ;; the constant that controls how much a car speeds up or slows down by if4 J* f6 a; U8 E8 M
;; it is to accelerate or decelerate. r$ E3 u. b' t( X" `7 c
phase ;; keeps track of the phase
$ `/ s( I" m6 `' H num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 [0 n% M/ M$ k/ b9 z: U
current-light ;; the currently selected light
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& [: E- K( K' c5 ? ;; patch agentsets
$ h6 L7 [. x1 T; \+ ~& I intersections ;; agentset containing the patches that are intersections
6 L6 i2 l# |" e) T roads ;; agentset containing the patches that are roads
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turtles-own" R& x# `; V. o3 G( ]( _
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! f( l4 K" b4 B) a: A speed ;; the speed of the turtle7 o6 r+ P% ^: I, Q
up-car? ;; true if the turtle moves downwards and false if it moves to the right
7 B. w7 l& `2 `( \; A2 ` wait-time ;; the amount of time since the last time a turtle has moved
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& o; @9 B- z& n& zpatches-own! E" c( k% R4 K- b$ X; H$ a
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- M F/ m% S$ o% H1 j intersection? ;; true if the patch is at the intersection of two roads
9 @ E& Z* v, B( F2 N+ ^* ~0 i* ? green-light-up? ;; true if the green light is above the intersection. otherwise, false.
( N1 l% F! R7 h2 ~; @, R ;; false for a non-intersection patches.
# s+ p" T9 B/ |8 S! O& | my-row ;; the row of the intersection counting from the upper left corner of the
% B3 ?$ n% X6 d ;; world. -1 for non-intersection patches.
- h* I( a; ^' ?. t my-column ;; the column of the intersection counting from the upper left corner of the
a6 x2 \0 I; B! D ;; world. -1 for non-intersection patches.* u7 N& M: {4 @" P
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
# Y A3 [" y7 T6 o auto? ;; whether or not this intersection will switch automatically.7 Q( Y7 l3 \/ ^9 L! k6 I
;; false for non-intersection patches.3 }4 n% G5 F6 H
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! U: M! f2 z3 U8 z; f: r! M;;;;;;;;;;;;;;;;;;;;;;
8 M* I( n9 ]7 B7 e* p1 u;; Setup Procedures ;;. ^* n) }) j! P" n/ {3 {
;;;;;;;;;;;;;;;;;;;;;;6 v9 C, K, ^& @9 `: g2 M
% _: X8 f3 d$ I: c) i: q;; Initialize the display by giving the global and patch variables initial values.
* h. ~* D! w; b8 ?;; Create num-cars of turtles if there are enough road patches for one turtle to2 B% C/ `, j f" f( J% {0 L
;; be created per road patch. Set up the plots.
% M# t% g( `0 [% n4 s# C; W* tto setup3 z4 {% O- h$ V4 R& }/ U
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables1 t+ ]& ]* C2 _$ s
setup-patches
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label-current
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set-default-shape turtles "car"
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& f; k$ l! q9 E q: \ if (num-cars > count roads)
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" i& @- O* l3 S- f' K7 R user-message (word "There are too many cars for the amount of "2 g3 M3 \& Q4 M1 @
"road. Either increase the amount of roads "
- d" {' M% x7 }' L S9 j "by increasing the GRID-SIZE-X or "( Q' y9 l( j6 `$ e, s0 `0 X
"GRID-SIZE-Y sliders, or decrease the "
5 R8 m) J3 X4 I2 x "number of cars by lowering the NUMBER slider.\n"
( }: j1 G4 O" W( W8 g$ ` "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- @) |- G4 z9 R& `% ^/ M crt num-cars
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2 F/ m9 M Q6 }: Z& J4 a setup-cars" b2 q2 K* v$ t( b+ F
set-car-color
# a& C; g% \' V8 M$ r# V6 g& F record-data
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;; give the turtles an initial speed
7 w4 f Q( c& O( f ask turtles [ set-car-speed ]
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reset-ticks
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( D1 q5 s( H; e% T; q7 h- _;; Initialize the global variables to appropriate values o4 a; [% p+ F& y1 N! g4 L* s
to setup-globals
* w# t7 [+ B1 D set current-light nobody ;; just for now, since there are no lights yet: `5 G) o( S, m6 w; i# j* S
set phase 0
# j; d$ J8 s4 p( G" y5 x set num-cars-stopped 0( n C( D% D0 U- A1 a+ @
set grid-x-inc world-width / grid-size-x, G! C# h$ ~5 t# \2 v6 D4 l
set grid-y-inc world-height / grid-size-y
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- ^7 U6 A6 y: |' }( l1 L ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& ?3 h# m6 \8 Q' q( f7 x
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" \$ `: x3 z( p% v, C;; and initialize the traffic lights to one setting
0 E: v* E! q6 e0 s. K2 |) hto setup-patches5 U e1 a; [) x( e: u
;; initialize the patch-owned variables and color the patches to a base-color
% l8 v9 V3 `, a ask patches+ `- }! E! U z. P) b$ s h( u
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set intersection? false' o& }8 v% |0 \2 ~* r# W
set auto? false' c1 v7 H, \ A) ^) ?% V
set green-light-up? true+ _4 L+ F0 p3 Z. X" ]7 x
set my-row -1. y6 q% z6 U! I! B- M) E
set my-column -1
4 o8 j+ A% {! z/ @) q: l' X% { set my-phase -1. e* z, A! Z+ U+ R" J% n3 n
set pcolor brown + 3; w* g% o% p. z7 w, W; f. H5 l- d
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) ~2 d# Q d3 V& z0 T ;; initialize the global variables that hold patch agentsets( \- g2 I. P) A, m; X! w
set roads patches with8 T& c5 o3 Y/ t- d
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% ]2 A8 D g# y& s4 D; |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ }9 F8 Y4 ?/ |/ c6 \9 f% N& `
set intersections roads with
- R& K$ O' Y# t0 W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# a6 M8 Q* |: U1 M# V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]% w3 @4 m0 W4 q
setup-intersections
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8 o' E4 Q; i! p$ c+ b其中定义道路的句子,如下所示,是什么意思啊?* [2 c" {' V" {6 j% b, E2 a5 V
set roads patches with; I: G- e" N% @* D
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
x. C' H7 a' j. D (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. M/ E) m' U8 T0 M7 q! Q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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