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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。. M' f P- ^9 ]9 S
netlogo自带的social science--traffic grid这一例子当中,' V. y9 ^# d9 j/ N' K( h7 _
globals
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( [; l" q. ?' @1 S- a grid-x-inc ;; the amount of patches in between two roads in the x direction
: G( w+ V+ v! Y" P* t j2 Y8 c grid-y-inc ;; the amount of patches in between two roads in the y direction
: G! @* O% ^2 T, Z& [ acceleration ;; the constant that controls how much a car speeds up or slows down by if6 M# G; e' x0 n1 s" N: f7 }2 s% n
;; it is to accelerate or decelerate4 Q6 h7 _0 j+ x7 `8 ~5 L
phase ;; keeps track of the phase& n2 K2 m$ J4 W7 I) e0 k# w) Z
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ T+ y: w# H2 q! |6 u current-light ;; the currently selected light
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;; patch agentsets
% R. m. }& I0 M3 n6 M' A Q+ g# P intersections ;; agentset containing the patches that are intersections4 S0 e3 x$ M7 a$ U
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
# T I! p" g2 k% l up-car? ;; true if the turtle moves downwards and false if it moves to the right
, Z6 A) E( e/ ] wait-time ;; the amount of time since the last time a turtle has moved
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! z3 O) U# S, s) z- c, W' q5 E: C+ Bpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
+ U6 Y; K- ~0 b7 ^' j% Z8 P green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 F3 v2 U$ Z6 f$ d+ `4 Y) F
;; false for a non-intersection patches.2 i: L0 x; B( {3 ~% h
my-row ;; the row of the intersection counting from the upper left corner of the {6 L/ Q3 N$ v7 K s3 f5 E9 D
;; world. -1 for non-intersection patches.
, `5 ^% \& N% G# I& o2 d$ B my-column ;; the column of the intersection counting from the upper left corner of the
' E) {% ]* k* e) U9 d- ?3 n2 K4 Q* C ;; world. -1 for non-intersection patches.; g7 M6 e6 V) e, m
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 q( m; b. q G6 Z; s. [8 \ auto? ;; whether or not this intersection will switch automatically.
2 O4 O3 _$ P) Z1 \$ y% h! r ;; false for non-intersection patches.7 \7 c# T* F2 s D
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;;;;;;;;;;;;;;;;;;;;;;6 }" {/ E; v6 K9 E
;; Setup Procedures ;;/ G( h5 Q3 u j T y
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;; Initialize the display by giving the global and patch variables initial values.
4 K9 r- y+ m2 N' t2 v& ?2 b: {7 p" B0 f;; Create num-cars of turtles if there are enough road patches for one turtle to' C, h- o8 h% o1 O0 H
;; be created per road patch. Set up the plots.
6 G) |8 E: b% d, }to setup3 S8 i7 t' }! H: ^) y! i( x
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
8 ^0 ~, r) W, a$ i0 N2 T1 z setup-patches
0 a- N v9 s# N; d+ o H, O make-current one-of intersections
2 f t) w! d }. E label-current) K' T b9 z2 y
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set-default-shape turtles "car"1 X2 L' |' S/ i- i" O, T
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if (num-cars > count roads)# n6 P. e. p6 D* t0 G
[
0 q' Q9 Y( { o user-message (word "There are too many cars for the amount of "$ E% }% y- x! M1 _3 s% b
"road. Either increase the amount of roads "+ w0 O8 A( S4 p; U4 x
"by increasing the GRID-SIZE-X or "
! C5 U- Z8 l/ }3 \9 ]8 d "GRID-SIZE-Y sliders, or decrease the "% R# A- P# b( A7 C ?
"number of cars by lowering the NUMBER slider.\n"/ ]7 n9 M; ]7 Z; Q
"The setup has stopped.")
; }6 K8 v2 O1 h! A: a4 t stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
8 D3 E) k( y0 O, k3 j crt num-cars# ]7 @2 w6 ]2 r: c. U a& ~8 u* \, {
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setup-cars
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record-data2 c- O3 {) C% S6 H/ p. o. X0 d
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;; give the turtles an initial speed
% F! C* q! ^- c4 t5 f# n ask turtles [ set-car-speed ]
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reset-ticks' k. i! v- ]; f# L! [5 O" K5 A
end/ } \# V7 O6 Z! K. w/ H/ P
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;; Initialize the global variables to appropriate values
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0 F* u9 p% h$ [) i% ~ set current-light nobody ;; just for now, since there are no lights yet$ Y; A5 D# k, d
set phase 02 [* Y ^3 s3 b
set num-cars-stopped 0
q" a( P' Y; F set grid-x-inc world-width / grid-size-x
% H- N" K6 J$ d, q- C R1 K( ? set grid-y-inc world-height / grid-size-y7 R5 ]# p4 d* r* o+ u9 [
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: X8 X4 U8 u) n7 r, s- Q& y set acceleration 0.0991 ?' U" _% Z% C! L6 E0 k- S
end% q# H; J7 w' ? e
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# z [8 j0 x0 A# Z3 w+ f;; and initialize the traffic lights to one setting
; l* G$ {1 Z8 p8 F* cto setup-patches
& w4 f; b, T( ^ |# r$ I0 d ;; initialize the patch-owned variables and color the patches to a base-color
7 c. b: Z; I0 n1 k- t* g ask patches; ]" E" F$ Y6 F
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set intersection? false
& j X$ D0 {) T8 M. g! U; s set auto? false
0 ~) h3 r# o" z set green-light-up? true" }# M7 K$ B& ~! {. C; t" r% j
set my-row -1+ S" F' @- [& g' Q7 N, h8 p- y: T0 J0 e( K
set my-column -1) e# W: ~+ f n0 F
set my-phase -1
$ [' e$ D! w* s4 M7 s( ^* ?6 u set pcolor brown + 3
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/ U+ c: Y. O2 r q, ? ;; initialize the global variables that hold patch agentsets
+ U3 x4 a. z8 X8 K) o4 m set roads patches with7 T- Q1 j$ Q+ L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 ~: H/ `) `! W4 N7 _" I7 J) R) k" v1 |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 i+ M+ Z0 I- F5 L. r* T
set intersections roads with
* Y' F# f/ ]5 T: X' M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 L @- V7 h8 X* J1 i4 @, S (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]/ t. @9 V* J" M/ j% U& H0 [( N9 m
setup-intersections2 f( z) @7 p1 G
end
$ B/ b- b% u8 I) @$ E V其中定义道路的句子,如下所示,是什么意思啊?
' E3 x [* Q* V5 J8 D set roads patches with+ k- G9 } c% [$ x/ }" \' U, Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 `$ M' H0 T0 b8 F (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; I/ r* u1 g9 P
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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