|
|
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 W9 F- O7 q) r1 R5 }netlogo自带的social science--traffic grid这一例子当中,
: M5 {. ?, b- W. U( \, fglobals% U9 D/ ^/ ]& p3 L+ l( d
[2 L! X- V0 A, }/ s; Q. }: r
grid-x-inc ;; the amount of patches in between two roads in the x direction" Y3 K) b: v, Z! a$ o1 x1 g! _6 ~
grid-y-inc ;; the amount of patches in between two roads in the y direction
& Q9 j2 @7 r+ q, o) d, m- v7 h1 E acceleration ;; the constant that controls how much a car speeds up or slows down by if( i' n6 d9 s t/ N4 Q3 y
;; it is to accelerate or decelerate
: r. w/ t) n; _ phase ;; keeps track of the phase1 S( d7 q$ U$ K4 S
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 p! _7 i7 b! F current-light ;; the currently selected light
. h/ `' |4 t7 b' G6 C% o" C9 r
, U1 j; _8 @ m2 N% Z. i ;; patch agentsets- \! C$ h# z5 U5 v
intersections ;; agentset containing the patches that are intersections
8 H0 z0 P# k- u7 R9 z, p) W roads ;; agentset containing the patches that are roads0 E5 q( D) _: [3 N
]* v, T5 X" X7 T# S: w
- X) N3 {% A, }1 [3 |
turtles-own* x+ J- _+ s' [1 w7 K7 x \4 o5 R
[3 A* J1 p4 `) q8 {; f7 [3 h) C
speed ;; the speed of the turtle
- I% Y; B9 ?+ |# P4 d9 k6 z. S up-car? ;; true if the turtle moves downwards and false if it moves to the right4 b3 T( w8 \/ k/ @
wait-time ;; the amount of time since the last time a turtle has moved `& u* m" d8 w
]! \& c9 T7 ^4 J L u. t
3 v) N. |1 s; G# qpatches-own
% q( _8 t5 N8 v: M% o4 I( _6 C[/ S5 f) q4 K* T
intersection? ;; true if the patch is at the intersection of two roads
* p' ]5 g6 n0 z- x2 [% J green-light-up? ;; true if the green light is above the intersection. otherwise, false.
3 Q v s. ~6 c o5 M2 N ;; false for a non-intersection patches.9 ^+ R. Z7 q) O; p6 T
my-row ;; the row of the intersection counting from the upper left corner of the
/ T2 Q: W5 ?! c1 ?* c; t ;; world. -1 for non-intersection patches.: @! Q2 X# ]1 v8 R1 B
my-column ;; the column of the intersection counting from the upper left corner of the
0 f3 Z" T9 l" m( z- r1 p ;; world. -1 for non-intersection patches.
; j8 c- `* G! r, W+ ~* _0 d my-phase ;; the phase for the intersection. -1 for non-intersection patches.
- u6 P2 E# Y- o" a auto? ;; whether or not this intersection will switch automatically.# V/ U# w9 d; m
;; false for non-intersection patches.
. H/ @% \& N$ }]5 n: v+ m3 i7 J
7 q, W$ k% r9 e
+ J7 z& D+ W$ k \5 l% A6 @;;;;;;;;;;;;;;;;;;;;;;1 ~! s3 G4 L% U* S% I" {
;; Setup Procedures ;;
J9 i" D l3 }6 u" `+ e;;;;;;;;;;;;;;;;;;;;;;
4 e; j# d# {- p* N! b" g
. j5 e/ Q. N" d* t;; Initialize the display by giving the global and patch variables initial values.
/ O) u. M) _$ `* H& ~& W;; Create num-cars of turtles if there are enough road patches for one turtle to2 r! R, q2 `2 ~
;; be created per road patch. Set up the plots.8 {" D/ E9 A0 M/ J2 _! u
to setup
: y$ @: ^1 X" z& J! t; ]9 C$ s ca% h4 z g; M0 v; l" J
setup-globals
5 o+ K% W+ |: I' S! l; U# l# ^2 Q4 v H* }9 L
;; First we ask the patches to draw themselves and set up a few variables
3 |5 l- x* i* G( i6 \ f setup-patches
/ {. f4 V5 T! L& J2 Q2 U! J6 O make-current one-of intersections4 \& [, j+ E4 f, }
label-current! ]0 e# T; c- g4 U
& ~6 \, V3 P( P# G$ q+ \- V5 f: l
set-default-shape turtles "car" d0 X V8 x0 k3 F
8 P( O, o/ m) E. b
if (num-cars > count roads)5 o2 R+ y+ @+ l& i
[
/ l) o; f0 o# u" @( D+ M8 j user-message (word "There are too many cars for the amount of "4 ]& R$ m* @, z( [ C
"road. Either increase the amount of roads "
6 }" O' I, G4 [ "by increasing the GRID-SIZE-X or "
* ]6 \2 E6 H9 w% s "GRID-SIZE-Y sliders, or decrease the "
; g' G/ i% Y D# a, x& E! D/ j "number of cars by lowering the NUMBER slider.\n"1 w3 k' F$ H, b3 O! `9 c# `
"The setup has stopped.")% n" ~* i2 [( r! s
stop
/ E" R7 ~( r# b4 I$ h9 c4 i; W% O, i ]+ o3 o- [9 C G" J0 q& K
7 q. s8 \. z' m( r% T ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
+ q5 H6 ]! O) b2 U$ x crt num-cars; I$ R/ q. y n/ c
[) z5 v1 X3 O) b( g Y/ r3 Z
setup-cars6 ~! `* q$ a o5 X* {6 b
set-car-color$ i; X6 p1 U( \
record-data
" Y. u g5 q' i0 H# I% O ], c [* O. V8 S* c4 E- f
" a( O9 K9 V* E2 U3 H9 m9 _ ;; give the turtles an initial speed
% Q# `, z P$ C+ G% |) z6 L3 [" ]' \' ^7 m ask turtles [ set-car-speed ] ]5 v; C% P" B" [3 t0 i$ T
' J4 U0 A+ J+ B4 }1 X# {8 E
reset-ticks0 R4 a3 I! |& q
end( J- M2 p* l) M) Q% s$ C
( v( e: k7 `9 u+ P% k+ f
;; Initialize the global variables to appropriate values
% W( J; m0 v' g- p4 Oto setup-globals* i2 W& ^/ A" @
set current-light nobody ;; just for now, since there are no lights yet
: F- S7 B6 ~. i# ^+ k set phase 0
; Q$ E- j8 R# z' Y set num-cars-stopped 0
9 R/ e7 N: `4 ?1 p set grid-x-inc world-width / grid-size-x
. I% w q6 C( E# @ set grid-y-inc world-height / grid-size-y2 D6 b! S2 H* h
4 \+ [7 |9 W; N$ j
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! f+ t" w+ C3 U" S ~) z: H set acceleration 0.099' }+ c2 W" |* i
end
( e) b# ?4 c8 o- S3 K
7 l& r2 g# i3 [8 U ]) M( v;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, k3 C! p7 J" _8 o, ^
;; and initialize the traffic lights to one setting" h3 H/ l2 A0 @$ D: D# x
to setup-patches4 y W$ w/ p; t9 t- Q1 ^
;; initialize the patch-owned variables and color the patches to a base-color
. s3 O9 ^+ c5 T3 E: R ask patches
$ }# \- F# v4 I1 `1 w: Y7 P [
: w: c5 a! e! | set intersection? false' {4 m S6 S* J, ]: v" y, j
set auto? false1 Y/ V+ [7 y7 }" u7 X
set green-light-up? true
" _$ Q; _% F$ C$ W set my-row -1, U' n. l% e4 [! H3 y
set my-column -1
+ e1 J; {$ h! b- ?3 W# V4 G set my-phase -10 E& v' G! e4 [* S
set pcolor brown + 3% g" W7 A* D1 J- B- T
] X8 d" d# K2 B. D ]' @7 S9 A
' J/ |5 n+ d: K1 | ;; initialize the global variables that hold patch agentsets9 X+ Q# f5 J0 F$ j
set roads patches with w) ?0 @. f* i# c7 d+ P8 q& Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ s& S8 x$ E& _
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 | S, d8 p$ U
set intersections roads with+ _9 I3 ?; {. r! m4 f3 A9 ?
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 }/ ^7 N/ g# I; }: B8 U p" H2 Y2 ~ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, E" L5 p( `6 T9 K! ^4 L' n5 r- m0 r! c
ask roads [ set pcolor white ]! K7 u7 _/ U- l7 @2 n' o/ R
setup-intersections
/ V, `9 u7 R. a+ `! j( o& @- d+ dend
4 B3 F N9 d5 e# }其中定义道路的句子,如下所示,是什么意思啊?) p. d3 r0 g P' {, }3 |
set roads patches with3 [# l7 e$ h( A6 O+ |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 h1 ~* J9 |+ n. a# Q% c (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; K' v7 k5 b6 v- d3 A& j8 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? |
|