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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。
& `9 U" N/ U+ _- `9 vnetlogo自带的social science--traffic grid这一例子当中,
/ ^! ]0 h; M; k# Y) y! Yglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
" g( O0 d: m8 h( ?5 B, W5 [ grid-y-inc ;; the amount of patches in between two roads in the y direction, J' K! O3 Z$ O, m7 N g
acceleration ;; the constant that controls how much a car speeds up or slows down by if
; L& O! U" `9 \- C ;; it is to accelerate or decelerate
3 K$ F5 x$ j& R phase ;; keeps track of the phase
6 B$ \% |; N4 F | ] num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure/ D- H/ l7 ?5 j
current-light ;; the currently selected light
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2 l3 A7 ~0 O" W! ]; d* ~6 S ;; patch agentsets W, J; z5 v: g6 u
intersections ;; agentset containing the patches that are intersections$ q3 X( C0 z+ w. H
roads ;; agentset containing the patches that are roads1 C, w! }) k" V% y$ y, z
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turtles-own; K# z+ K) J8 ?
[
# B; ~- }& k! s# t$ W4 b speed ;; the speed of the turtle% L% E$ ^. J0 J6 t; Q y' u
up-car? ;; true if the turtle moves downwards and false if it moves to the right
% U) m/ C# l5 w& W; w8 f; q wait-time ;; the amount of time since the last time a turtle has moved
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patches-own" E. ?' n0 i: t& p g, B4 b& k( Y
[
# R) ?$ Y0 `, M" L intersection? ;; true if the patch is at the intersection of two roads* V# e7 g' ~5 f5 q' K5 h, M
green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 E" ~8 {5 z- P
;; false for a non-intersection patches.
3 K/ k4 D* ]% f' c. q, Y my-row ;; the row of the intersection counting from the upper left corner of the3 e% T8 [" j$ h1 a# A( e6 i4 i2 B
;; world. -1 for non-intersection patches., }/ q% G1 V# N
my-column ;; the column of the intersection counting from the upper left corner of the5 \- [. U4 H3 W4 S2 {: p$ n2 m; }
;; world. -1 for non-intersection patches.
6 c7 O& Z+ m! V" L5 \ my-phase ;; the phase for the intersection. -1 for non-intersection patches.5 M( ~( T/ |" d1 p- l$ m7 l
auto? ;; whether or not this intersection will switch automatically.
2 `( [; e7 c3 [" H ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;' A6 k; p$ z4 E$ A
;; Setup Procedures ;;4 y3 T: A. W3 i# x- J
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.& `, P' \% I( H5 h) ?# X9 z, t2 h
;; Create num-cars of turtles if there are enough road patches for one turtle to; @% a: g# i1 W; X' G
;; be created per road patch. Set up the plots.7 R* O9 I$ r7 ~& J/ \4 S4 K% U
to setup8 \# o* V8 q% `/ b: ^" x* E8 K
ca
. E& Y7 G6 z5 F5 j R9 J2 p) J# I) { setup-globals- S8 p1 I1 p' e' k# e
" z" n6 d8 M, \ ;; First we ask the patches to draw themselves and set up a few variables
. E) ~( b# [, P* M5 e& H; g setup-patches
; V) m% R" M" }# ?, J make-current one-of intersections
8 O& ]% y+ p9 j* O0 _' L' c label-current9 [3 S& X, I) B
) k6 Q0 {8 F( c1 T set-default-shape turtles "car"
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8 K' m. S0 K0 _. \2 }; [, |& k) c if (num-cars > count roads)
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$ S1 o! i/ s0 l+ n, w( _3 c4 S user-message (word "There are too many cars for the amount of "7 P4 @4 l3 Y+ K
"road. Either increase the amount of roads "- k. C* d& A+ l- v( R
"by increasing the GRID-SIZE-X or "
- J# O& L [8 w "GRID-SIZE-Y sliders, or decrease the "
! Y+ _* C, G& S% Z9 { "number of cars by lowering the NUMBER slider.\n"
. O3 D2 _% E9 a l8 W4 u [ "The setup has stopped.")4 s, r! M1 W6 {
stop
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% T) I. u' u/ }! y9 I ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ W' i( r( Z \& B- d
crt num-cars
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setup-cars
8 _6 i& r* ?9 J4 n% V set-car-color: ?6 c+ S9 X; q
record-data
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& B) f5 s2 w! q1 ? ;; give the turtles an initial speed
- y/ w5 s& B: Q# w6 U ask turtles [ set-car-speed ]
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* T$ h% ~8 _1 \ reset-ticks7 Y; _6 @( r `. r" R# ] j- d
end" Z" s8 g( e4 Q# N
7 T) k, \$ S! ~) `' u- o;; Initialize the global variables to appropriate values
9 A, ]# |0 d I4 d( ^% f t0 S$ Ato setup-globals! m. t/ n! _* p' x7 W9 e. z
set current-light nobody ;; just for now, since there are no lights yet, f# r2 ], ~4 F9 s) K$ j
set phase 0/ O' X& f- L& n% I6 k5 m
set num-cars-stopped 04 C- \8 ?4 @( N' E% [7 @
set grid-x-inc world-width / grid-size-x, S3 s- Y1 z6 {1 ~( u# O8 `1 w
set grid-y-inc world-height / grid-size-y
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% I3 Z9 T9 a1 s6 e6 z) f w ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, ^. d& b/ `/ S- c1 W
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; y h1 Y2 j0 v$ o# I2 [0 J& R/ r
;; and initialize the traffic lights to one setting% C/ F9 v E& d" ]: C5 L0 ^
to setup-patches- O( x1 ?& y+ X8 t
;; initialize the patch-owned variables and color the patches to a base-color
1 J6 Q2 Y9 J9 z* N, u ask patches
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set intersection? false0 D! x% C7 P0 {- v" Y
set auto? false- K* q3 w4 S% F7 x# i5 ]
set green-light-up? true1 o9 M3 B! }7 V7 \0 `8 z. i
set my-row -1/ j; e! Z) L! ^$ @" `
set my-column -1
0 [3 {& `: `( D& x: A7 S% X3 U set my-phase -14 W6 R- J) }7 q+ y* r; O* {! J; T3 s
set pcolor brown + 3" _ D5 `' M4 g: R& V
]
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;; initialize the global variables that hold patch agentsets
5 x/ C$ @5 s2 W5 H5 w0 r set roads patches with
$ F) S8 v* i: Y! k4 h [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 H3 [3 ?9 P8 P$ [
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 |! s: q, Y3 q6 E
set intersections roads with- c4 Y& {9 m! X" H4 |" k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 P! Y5 y' Q: F% n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]# W9 S' i+ k1 J$ Z- r' ^, h, ?
setup-intersections0 o. E" L$ I4 C2 w; P1 [! B Z
end
, ^0 _ U! w2 X0 x其中定义道路的句子,如下所示,是什么意思啊?1 c h: j2 }1 I9 A+ u8 p( A8 \
set roads patches with6 I, V j% j; c
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 l% v+ T. P" m8 |* t5 s8 J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)] Q; J2 W/ P" @$ Y/ A; {. i5 g6 `
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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