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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。
5 }3 W% R6 e7 @* f2 ?2 Jnetlogo自带的social science--traffic grid这一例子当中,
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grid-x-inc ;; the amount of patches in between two roads in the x direction: U4 v+ Q4 u# x# Y* H0 m {( M
grid-y-inc ;; the amount of patches in between two roads in the y direction
, K; M6 Z. ]: ~0 r, }: V( a acceleration ;; the constant that controls how much a car speeds up or slows down by if
3 p4 D% V8 F3 ?) |3 Z H& }3 S& b ;; it is to accelerate or decelerate6 e1 k% M) D Q% Y
phase ;; keeps track of the phase# B3 M$ S9 P, G7 {
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure6 L) l# i7 V+ D* s
current-light ;; the currently selected light, }) ~1 _' S6 ]% r# d% j& p4 u
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;; patch agentsets
1 q1 d- |+ Q& Q6 v1 @1 w intersections ;; agentset containing the patches that are intersections/ R# t# h& A4 q9 C D& s
roads ;; agentset containing the patches that are roads B, a1 F9 E3 |4 U. H. k
]
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turtles-own; {; `3 j: x' k
[
. B# y, ]: u7 O8 {: Z" K% v" d speed ;; the speed of the turtle
0 o5 [" k" m( `! g6 A v0 k* @ up-car? ;; true if the turtle moves downwards and false if it moves to the right0 ^# B& v I6 U6 W! O/ ]
wait-time ;; the amount of time since the last time a turtle has moved, [" A" H9 B* O& ^7 h+ E
]
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patches-own
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0 F3 a: O$ |0 T( ~& X: ^% y intersection? ;; true if the patch is at the intersection of two roads! O% X+ v' L5 W; R, k& T
green-light-up? ;; true if the green light is above the intersection. otherwise, false.3 J" S6 ]- I1 w& S
;; false for a non-intersection patches.9 f* q$ D' O* C4 i4 e+ a
my-row ;; the row of the intersection counting from the upper left corner of the
! z, J, u$ Z2 H ;; world. -1 for non-intersection patches.7 ~6 s! r9 `4 D5 |: r9 S5 _# A
my-column ;; the column of the intersection counting from the upper left corner of the8 X9 S3 W& H- W$ w ?4 {$ p
;; world. -1 for non-intersection patches.
/ ]; K! D# i: j% o7 J my-phase ;; the phase for the intersection. -1 for non-intersection patches.
- s9 T0 ^- U# l, h auto? ;; whether or not this intersection will switch automatically.' T5 r- `2 u# M
;; false for non-intersection patches.
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3 y( {# T6 X+ S6 i;;;;;;;;;;;;;;;;;;;;;;/ n* t+ N. u: a. A
;; Setup Procedures ;;/ {0 R( \* c( a* S
;;;;;;;;;;;;;;;;;;;;;;
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}5 G3 ^0 V7 e/ f) h;; Initialize the display by giving the global and patch variables initial values.8 m! t6 O; ]2 D, {! Z1 D6 E& P+ t2 }3 D
;; Create num-cars of turtles if there are enough road patches for one turtle to
0 b" k! Z; R7 X1 i;; be created per road patch. Set up the plots.
7 a# {1 [2 }% t" l# i& Q- E. P$ tto setup
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setup-globals6 D; E2 f' a* k, F( ]$ y2 F
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;; First we ask the patches to draw themselves and set up a few variables
7 l; B/ A; I& X) h/ C# Z7 g setup-patches" ~7 a4 `% r3 h& j A" |5 I
make-current one-of intersections! P- H' Z' d x0 B- U: U, k8 b
label-current3 N, A; f8 ]; H6 c- T3 _
7 U9 i- r! v# ^& C! a8 |) T set-default-shape turtles "car"1 [% Q" |/ U0 H: k
9 m# X, B; m; X2 P0 o if (num-cars > count roads)
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% y1 c- K6 K( W user-message (word "There are too many cars for the amount of "
" n5 M/ a8 x E h "road. Either increase the amount of roads "( F( }: F) }; k& m' @+ g8 A; c2 e! r$ R
"by increasing the GRID-SIZE-X or "5 Y7 C; K. o& U7 d* i+ f8 H- X
"GRID-SIZE-Y sliders, or decrease the "! e- ~3 z* M& y+ V
"number of cars by lowering the NUMBER slider.\n"' u3 B$ U1 r# E
"The setup has stopped.")
8 b1 a2 }2 C1 d# M stop( M! G8 i' t9 W: C5 ]4 q
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 S% f" x. U& F. y
crt num-cars2 p, r2 M4 b* q
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setup-cars
- W/ H; Y( U" t2 L set-car-color
( S, S1 x% h# F! m record-data& r( }; b* X" z# ?
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0 R% t" L9 x1 B, \ ;; give the turtles an initial speed
8 K& n0 C6 O5 [ ask turtles [ set-car-speed ]
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reset-ticks, U* f1 K2 T* w
end, O9 k% [; x7 ?% g; n3 [5 L
6 I8 L7 K" z5 i% L! r. d: b6 q;; Initialize the global variables to appropriate values6 K0 |: M9 Z. [+ d5 s$ I
to setup-globals
7 t- i; j- ~3 i" n( R4 Q$ D set current-light nobody ;; just for now, since there are no lights yet6 F- O6 Z/ P. @, S0 [9 G* \
set phase 0
1 b* U) K! {" M5 V" a& f+ U set num-cars-stopped 03 p( ~# O5 j/ @& ^4 n" I$ e
set grid-x-inc world-width / grid-size-x r8 g3 L: p; J6 D) y1 X; l
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% u. |* ~: D1 {. l
set acceleration 0.099
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% S. n3 ]9 V4 x# i$ K;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; e" T f+ c2 l! Q# t7 o;; and initialize the traffic lights to one setting
8 u$ |$ ?8 j) {; Z2 C* w) |to setup-patches; V1 x* Y4 Z: ^5 U" X
;; initialize the patch-owned variables and color the patches to a base-color
" ?! Z# ?0 z7 q+ M& w4 {7 z ask patches
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set intersection? false
0 @$ a. t+ X! E4 W7 l set auto? false
6 b( R4 C: c; k' ~& S set green-light-up? true
R/ i; n, O" g! V set my-row -1
$ O0 w/ C: G) a# j: D set my-column -1
: e+ X$ @; l# k set my-phase -1/ O6 \1 l& _; V6 I/ E6 x9 F
set pcolor brown + 3
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. q$ ~8 u4 n( m7 Y h ;; initialize the global variables that hold patch agentsets" k! N( x: o7 K% x5 |* M5 J) l
set roads patches with
& v& t5 B! i. ]' |+ ?0 A [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ x p. M. c, O: b( X$ v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 x9 g" k# a# z6 g( j& q* T set intersections roads with) i% z6 L2 p( x( u2 _( K
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& @9 b" G2 H% `: o+ h1 k: d (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]9 `. O" L8 X: {
setup-intersections
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3 G! T4 P% Y/ t% |9 x+ Q& d c) U% U其中定义道路的句子,如下所示,是什么意思啊?
$ y5 o) E3 ~& ]# N, J: r8 y; P7 } set roads patches with
5 ?/ `0 l, F$ o! |: c" h [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; g- R& V7 \4 R( Y, V( P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' S, o: S! P# I9 {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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