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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。
8 \- o0 w5 ^' qnetlogo自带的social science--traffic grid这一例子当中,
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2 @9 d7 J) B" f" W8 a8 C: e' e grid-x-inc ;; the amount of patches in between two roads in the x direction
( K" B3 ^/ j8 I3 V# a5 y1 S grid-y-inc ;; the amount of patches in between two roads in the y direction& y, K3 O1 @' A* K7 M& z. h
acceleration ;; the constant that controls how much a car speeds up or slows down by if) g6 z; ~. d8 i9 Q" Z
;; it is to accelerate or decelerate: L& Y, C& C: `+ `( k) ?
phase ;; keeps track of the phase
, b" j6 S) }2 P( a& d$ K num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure0 X5 k/ E2 z7 B% b6 {* T$ e$ N
current-light ;; the currently selected light4 a( R r: Y9 R: Y% t7 u
, D/ G/ t& p: s) b ;; patch agentsets( A. f9 E. R( F: B# b" D3 C
intersections ;; agentset containing the patches that are intersections
5 q8 }# V0 t7 l( } roads ;; agentset containing the patches that are roads
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8 l* s0 D; l; _7 p y( a1 fturtles-own
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speed ;; the speed of the turtle" r; Q2 a8 k- ]( ^
up-car? ;; true if the turtle moves downwards and false if it moves to the right7 v" ^: M2 H- G. U `3 ]8 L; p
wait-time ;; the amount of time since the last time a turtle has moved
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5 X6 x8 b- |' [' {patches-own R$ I2 v/ ~9 |6 F6 H4 U0 R
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$ I9 C- Y0 N( u- e$ b intersection? ;; true if the patch is at the intersection of two roads
# [/ Z+ f) P* W- u green-light-up? ;; true if the green light is above the intersection. otherwise, false.
5 V( o4 M0 I: U$ ?5 d ;; false for a non-intersection patches.- V' }2 x9 [$ q3 _: r [1 y& ?
my-row ;; the row of the intersection counting from the upper left corner of the! M. N+ L+ \$ X$ s& S* t. [
;; world. -1 for non-intersection patches.* i% Q2 R" k* @2 |7 {( M' A
my-column ;; the column of the intersection counting from the upper left corner of the
$ A9 i) d& p" u) N2 J; i ;; world. -1 for non-intersection patches.. X& K% r j$ O6 U6 N4 w) H
my-phase ;; the phase for the intersection. -1 for non-intersection patches.! M+ V& } E5 o* [ r) n l: E8 ^
auto? ;; whether or not this intersection will switch automatically.( r3 m3 y! E: p$ l
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;) m- Y( v. d# }- x* c2 f
;; Setup Procedures ;;6 ]+ y8 F8 i. ^! @: t% S1 h
;;;;;;;;;;;;;;;;;;;;;;' o3 L- y; t# j7 f
8 o0 [% K* U% o4 [( V& s, Z- R! e;; Initialize the display by giving the global and patch variables initial values.. h7 F& A9 |5 U
;; Create num-cars of turtles if there are enough road patches for one turtle to1 C+ q8 s& `) |, f$ N- @
;; be created per road patch. Set up the plots.+ a0 T$ m# x9 `" V% j5 \
to setup# H6 s) f9 a: s# L
ca# b& m6 [5 \$ ?
setup-globals s" D" X4 U2 X- z3 M* [
, y; B( `: E9 a% D/ K6 n* L ;; First we ask the patches to draw themselves and set up a few variables
; u T4 A W0 }1 I/ V% ` setup-patches$ W4 B- }/ k2 P* B2 R# t
make-current one-of intersections! @, X! c5 @ E( }4 l0 c( Y
label-current3 d0 W/ ^2 o8 W
: {$ U& S- N& ?. _% g5 S) j: a set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of ") O& \# w+ z4 |: N8 D1 ~
"road. Either increase the amount of roads "
. @! G$ {) o5 \$ ~! j& J4 K7 e4 O "by increasing the GRID-SIZE-X or ", g: S* @" }9 W% S% D
"GRID-SIZE-Y sliders, or decrease the "
4 ^5 t% j; M& H "number of cars by lowering the NUMBER slider.\n"
& x$ I2 H( |8 l8 i, o4 p% c( A "The setup has stopped.")
- O$ c1 d) B* C stop4 \) F* h9 o5 u( D
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+ K' F1 e9 U8 R4 V T1 c! g# C4 x ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" Y9 C5 X# T8 g1 @: w3 T+ m0 T
crt num-cars
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setup-cars: a& d& |- ]7 `7 \, p( b6 w; v
set-car-color
B# G. g' t" k record-data
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& ~- X% h |, w( P) S ;; give the turtles an initial speed7 H* P5 P$ m( Y
ask turtles [ set-car-speed ]
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reset-ticks
: W2 N" t- @% b$ T5 u3 ^end
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: {: n- @8 @: L& w;; Initialize the global variables to appropriate values
; x4 P' n* g6 {5 [) }to setup-globals+ X @1 r7 `4 ]* F
set current-light nobody ;; just for now, since there are no lights yet9 ]( B" K5 w; q# Q( t- N
set phase 0) ~0 a0 d* N( d, T1 A
set num-cars-stopped 0
1 P3 k$ L! q4 i" ^# v( l% v set grid-x-inc world-width / grid-size-x
# }& `+ ~( s7 F+ r4 X 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
b$ b1 k9 u, O$ n2 u" w set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,! Z g! F) e( N1 h* y
;; and initialize the traffic lights to one setting
0 `+ ^" v6 d; g1 n7 ]* y9 Uto setup-patches$ w {# ]" E+ j6 W& I8 d
;; initialize the patch-owned variables and color the patches to a base-color' U9 c3 y& G# b
ask patches: L; [: Q B+ u$ ?
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set intersection? false
# N7 V$ Q. j6 z set auto? false8 ?% k: \ P& D2 k+ F
set green-light-up? true
* F- l* @* l4 ? set my-row -1+ J" S+ m8 l4 R& w) i6 n8 M
set my-column -1
k. q1 H% Y* [; s# Q" P& L set my-phase -1
2 ]/ u' [, _4 F& A# p$ f! O6 N set pcolor brown + 34 ]6 N3 m& w4 m+ T( z
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;; initialize the global variables that hold patch agentsets" n! b0 ?8 r/ V7 W& [
set roads patches with
% {4 M$ F) t. ^/ N% Z, q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 T6 ]% l5 y' T, B (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) }/ f: P4 z! |, g* v5 Q set intersections roads with, y7 |3 y- }8 N( m! Q: q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* N+ z" X# S5 s5 {/ ?6 A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 w. R% e! U' n( |6 o; h
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ask roads [ set pcolor white ]2 x/ m3 c* o: }7 W3 R9 i
setup-intersections
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$ ~6 ]5 Q5 `) J# \' b. p" c8 a3 x其中定义道路的句子,如下所示,是什么意思啊?
( ?. b8 P; z8 G2 n( h( v+ J# ~8 { set roads patches with0 A& ~+ v" m' {5 \+ r& u2 k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 q4 n, O) S/ C5 A6 h- a6 y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- T9 g7 Z0 s- ?
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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