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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 O, D# r& ^9 N9 o
netlogo自带的social science--traffic grid这一例子当中,
9 h1 ~) h! w1 J. o& aglobals
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6 p0 W7 y6 U- ?( V" I( x6 R J ^ grid-x-inc ;; the amount of patches in between two roads in the x direction6 O, A3 j8 q5 W* i
grid-y-inc ;; the amount of patches in between two roads in the y direction
# T* ]+ a* U0 D. C0 m; | acceleration ;; the constant that controls how much a car speeds up or slows down by if
& f4 c6 o- C2 S/ K1 d( x# v ;; it is to accelerate or decelerate
4 j) X6 U- \ }6 U phase ;; keeps track of the phase3 u$ H; O" G) |- |" v' j
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
# ~: D& F/ J" s; P5 T' b1 S current-light ;; the currently selected light
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9 m$ ]0 B( H8 ]: U- s ;; patch agentsets/ J$ [( `- b& W# s
intersections ;; agentset containing the patches that are intersections
% N4 [1 _: W6 ~8 J: l roads ;; agentset containing the patches that are roads' ]& ?% o; c' O& l/ k
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turtles-own% j) | a9 }& ~
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speed ;; the speed of the turtle
: m; c. Z: D1 H; |/ U up-car? ;; true if the turtle moves downwards and false if it moves to the right
! j% ?0 \0 w0 A wait-time ;; the amount of time since the last time a turtle has moved
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6 P3 i- Q( ~0 g+ npatches-own
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. l$ L* [5 C5 G3 [: h. \! f intersection? ;; true if the patch is at the intersection of two roads
6 K2 J8 i) ~6 l$ R: u green-light-up? ;; true if the green light is above the intersection. otherwise, false.
B' V. x* Q" ^- F ;; false for a non-intersection patches.; U# D2 k4 D8 |8 ], J% v' d
my-row ;; the row of the intersection counting from the upper left corner of the! {: g! f0 U0 \ v
;; world. -1 for non-intersection patches.
" B1 B& t* k1 S" ~: C1 ] my-column ;; the column of the intersection counting from the upper left corner of the
: q9 D+ o4 j8 z. a8 k6 S8 i ;; world. -1 for non-intersection patches.7 Z# l- l; e* Z/ Y2 W7 y
my-phase ;; the phase for the intersection. -1 for non-intersection patches.: u+ V5 ^* m, j& o# Y6 C c
auto? ;; whether or not this intersection will switch automatically.! P' M. Z" u# E* k& `( E9 u
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
) O6 J' }9 c4 T q+ l/ H;; Setup Procedures ;;* d! F* q9 P. w. N
;;;;;;;;;;;;;;;;;;;;;;
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: V# {5 D$ f) ~$ [/ i E7 v;; Initialize the display by giving the global and patch variables initial values.
5 v b* @# [% [+ d* |6 ^;; Create num-cars of turtles if there are enough road patches for one turtle to
4 V, l& T6 w6 j( \;; be created per road patch. Set up the plots.
: F, l* _. ]( H, Gto setup% u3 S* s; i5 ]; K- w6 j
ca
9 b6 `$ q" \2 i5 w$ z& q8 |- P+ K setup-globals
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! m D4 j' n1 u8 K, ` ;; First we ask the patches to draw themselves and set up a few variables
, C* K" k2 F1 H9 a5 x& M setup-patches
4 i3 W4 u- I* @% t1 c' a make-current one-of intersections
8 ^6 W7 N8 A( ?$ N; _ label-current' M% ^, k. ^7 K2 c3 B
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set-default-shape turtles "car"* L" {' @5 N5 _5 O- ?; n- l0 J- a
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if (num-cars > count roads)! b" D& {* r! d
[
( ?+ x3 [% m* h1 C* _/ w+ o user-message (word "There are too many cars for the amount of "4 U: r/ D; R" ?$ Q% p" W
"road. Either increase the amount of roads "
1 h- E' {) Y* ? "by increasing the GRID-SIZE-X or "& } `2 a' r5 U2 k
"GRID-SIZE-Y sliders, or decrease the "
) X- [1 g4 q+ q. [# F1 H: U "number of cars by lowering the NUMBER slider.\n"0 d' o, \0 }' Q; B4 O
"The setup has stopped.")
( B& h5 B: @: d4 f+ E% d9 r" f. t3 u stop8 [, {8 Z" R$ ? V% m3 r5 A0 ?* |
]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( h- p% I7 Z' ?9 S& T7 N
crt num-cars
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setup-cars! K' G- t( N0 U- a& Z: k
set-car-color
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;; give the turtles an initial speed
, i, {; U w/ L- u; S! Q9 W ask turtles [ set-car-speed ]9 C/ c6 R- k. Y. ?
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reset-ticks" W8 h) s Z z8 G {: v
end3 \( i2 h; V3 I
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;; Initialize the global variables to appropriate values7 \4 G( w8 E; U1 t* c9 j' \
to setup-globals2 w# r& `4 J" U5 p/ C8 k
set current-light nobody ;; just for now, since there are no lights yet4 g6 U! h- `5 D, a& T7 U
set phase 0
/ ?$ S2 g- U/ f set num-cars-stopped 0
7 Y1 F! `- p" R# S set grid-x-inc world-width / grid-size-x
! ~+ g3 M8 T, i6 k' U+ ?+ ^ set grid-y-inc world-height / grid-size-y8 z4 f$ c' O x% L
' a" [6 L7 [9 ?" ~; @+ c# T ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
1 V: U. ^9 s5 h set acceleration 0.099- e; F+ R3 |! x$ J; T
end* ?) Z! w+ f1 K4 N" g
) t8 U( C' @9 e" {& ?/ b;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 {, h8 K. M4 h7 b;; and initialize the traffic lights to one setting! C' k* `6 @* P; N
to setup-patches. g; L# [8 j8 p9 _# R. h
;; initialize the patch-owned variables and color the patches to a base-color9 n$ |% }, ]/ E! o6 {0 p
ask patches
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set intersection? false- g9 t+ S; B9 }0 a; A* B0 _# x/ f
set auto? false! A$ H* s! U6 V F
set green-light-up? true
Z7 D0 a% @9 w. g+ i set my-row -1
2 s) Y$ k+ _% o1 ?5 \5 r$ c set my-column -1# d3 M# K4 B' |( g# o) a: b
set my-phase -1
3 S% v/ k7 e. U" [7 W$ |& V4 `' L set pcolor brown + 3
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4 V' k* R; g7 q) r" h ;; initialize the global variables that hold patch agentsets( d, a0 B5 B8 S' O7 ~1 r& t8 u
set roads patches with2 @ N: p$ Q. D1 t# Y% E
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 ^. Q$ H: J6 V) u+ W8 G9 @' A) y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 K% o/ y+ v' ~/ l& Z set intersections roads with
9 G- M2 q* Y9 y7 Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 u! }& Y4 L. I6 }! u. z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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3 O) S* ]3 _3 s8 w ask roads [ set pcolor white ]* J w) d( i& x# u6 h2 |
setup-intersections1 H; ~2 [6 E% X! s0 j
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其中定义道路的句子,如下所示,是什么意思啊?
5 [" p' w) w1 o1 K* ~( U' c( G( p set roads patches with5 A$ U* Z! h. Z! m% Q* Z" @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" x# D& M. R* s7 Q; g# y8 r' ~. C8 u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( F. R- a, J, Z& S; w! |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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