|
|
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。
3 u& k4 T8 k2 g: }5 \5 Z9 v+ P/ _+ fnetlogo自带的social science--traffic grid这一例子当中,
. k. W/ @0 H7 }9 L& x2 K! ~globals/ f# k6 D/ I: v% w. B" _( w
[7 H$ v, P u" ~
grid-x-inc ;; the amount of patches in between two roads in the x direction
2 I( h. u# h: M0 _6 b6 N grid-y-inc ;; the amount of patches in between two roads in the y direction
- z- ^2 J5 O! N acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 K1 i( x- u8 r% @/ B! O ;; it is to accelerate or decelerate$ v+ b2 O5 L: \
phase ;; keeps track of the phase
" e9 ` b% W0 h5 K num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% q) x" x4 V1 U) ^3 g4 ?) l
current-light ;; the currently selected light
# E) }. l4 A$ v K2 h
! V% `: y2 M0 Y# _& i ;; patch agentsets
/ n z' |/ M' l$ z; Q intersections ;; agentset containing the patches that are intersections6 k9 E p+ I7 f9 c0 y7 Y
roads ;; agentset containing the patches that are roads% V4 @ v% z( d9 E, D
], `1 K6 P. e0 R- R# F2 y# x
) g9 D5 _$ |. d0 _! R9 H1 e) ~
turtles-own. S0 Z0 j' T1 r
[1 M7 s* \- L& |8 D
speed ;; the speed of the turtle
$ S! P5 ~& q, ]2 T$ C. y up-car? ;; true if the turtle moves downwards and false if it moves to the right- e8 S6 \* x- T- b& s) a6 E, K. k
wait-time ;; the amount of time since the last time a turtle has moved4 \ t9 c6 S% L) I
] J" c# \4 p) Z" `! F
, U+ v1 _7 S& }; j$ o1 |: i
patches-own
6 ^3 y3 i& O; s; a3 h[
1 m' M6 G# a' ]6 W intersection? ;; true if the patch is at the intersection of two roads
& |' z( Q4 f3 O. l3 E4 I8 h% Z# @ green-light-up? ;; true if the green light is above the intersection. otherwise, false.3 b8 K M1 k; B" ]" P& t; c
;; false for a non-intersection patches.
+ N& ^1 Y) a, K+ o7 X! L my-row ;; the row of the intersection counting from the upper left corner of the+ U$ y; d7 l4 U5 i
;; world. -1 for non-intersection patches./ y* \# A6 b% _* h# @ M
my-column ;; the column of the intersection counting from the upper left corner of the- _3 A* M+ Y5 m3 w
;; world. -1 for non-intersection patches.
) ~! G! S0 Q# o5 a+ z5 F: ~8 h4 a& l my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! ~( M W. N2 E' B6 N! {( | auto? ;; whether or not this intersection will switch automatically.
' \5 ^8 Q5 [5 L; h% d% u& H ;; false for non-intersection patches.
/ D" H8 o9 t- U- x- T]( s: _- V/ l- e3 I: v
! h0 c) r1 v o6 w* C1 g. d
' L( d5 {5 ` Z& @4 ?$ A+ `6 r;;;;;;;;;;;;;;;;;;;;;;
- R1 W9 M' |6 r2 q3 V;; Setup Procedures ;;
- u1 }! H2 w Z! J;;;;;;;;;;;;;;;;;;;;;;
% L0 [: _9 [7 K+ A! B! V6 E2 h+ R8 s) d6 \& {
;; Initialize the display by giving the global and patch variables initial values.! q2 {1 `8 Q0 C- p9 w# J& g
;; Create num-cars of turtles if there are enough road patches for one turtle to0 d* j# B V+ y) @) J
;; be created per road patch. Set up the plots.
1 S) P7 x1 |# gto setup
) v+ N* {- }2 I' ?2 Y0 r7 ~- M ca; C/ F* M- h. U- j# n+ l4 W
setup-globals
$ j! a0 F) [ @' M1 d4 j; O0 q4 @# z; |
;; First we ask the patches to draw themselves and set up a few variables
( @" Q, d1 s! R setup-patches
/ r5 L: u5 g3 g1 o make-current one-of intersections* H2 W3 z9 {9 |. Q1 K7 C# q
label-current5 }6 H% V# _, |
8 ?- [4 X9 Y& {+ ~ v f( G set-default-shape turtles "car"" X5 K4 p! S0 H/ U6 R
% X% k9 y m0 v, s' D0 R: P- W
if (num-cars > count roads)+ j. O( c$ O" I6 n0 C
[% I/ _7 j; q9 n4 _
user-message (word "There are too many cars for the amount of "" @0 X% L! }9 l6 V8 |' ?$ ~
"road. Either increase the amount of roads "5 E- y. x. ^8 |+ M. ?: \
"by increasing the GRID-SIZE-X or "
/ P t$ ?7 S' @) [ "GRID-SIZE-Y sliders, or decrease the "8 o+ L$ l i; z/ s9 k3 O
"number of cars by lowering the NUMBER slider.\n"% h6 h9 ]2 p; D( [
"The setup has stopped.")0 `* G% c/ Y _
stop
+ Q s* i, y% ]8 L2 C4 n# _; c ]' d' M# X7 q' `( m6 g6 O) r7 V
# M$ T" r, w( P$ X: K$ _
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) e6 `2 j8 Z) j6 `& W6 s) ^* p crt num-cars9 o$ T* B, Q# k( r: ^0 R
[
; K$ b/ x! d3 I- _; } setup-cars
5 m% i" U) [: I' Z9 L set-car-color9 P0 W# K* t4 F1 o5 h4 ?# X4 M2 e
record-data. K! P0 ^# n D+ W
]
0 U: b }# h! |: u. T0 O o
: Y7 f: K: h: U" q) q ;; give the turtles an initial speed+ r& ], v- h- w0 h# t
ask turtles [ set-car-speed ]
* ?) Y, |( z- p& U9 |6 v: l! X3 ~2 i c+ ]" A
reset-ticks% H( I7 b. {" y8 @
end' w9 K# u3 m X- v1 O# z2 A
. l% \: e- J8 P1 T1 O/ ?. A;; Initialize the global variables to appropriate values
. o( K0 J6 ]& [3 wto setup-globals
- t2 Z7 I) {6 J6 Z7 q" G* _+ ^4 K set current-light nobody ;; just for now, since there are no lights yet
2 y* Z3 ]* j' F$ f. | set phase 0, D$ g$ t2 s' r2 [
set num-cars-stopped 03 K9 x6 `+ i% K- Z! j5 q
set grid-x-inc world-width / grid-size-x6 S; t" T7 L& D
set grid-y-inc world-height / grid-size-y: y2 m9 m' ]5 N9 M
/ i f2 n5 L6 F ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" L R9 S) l9 Z+ K
set acceleration 0.099
- g8 v! P* B0 }5 c. K0 Dend
m$ y% _6 E; N$ m" x( {$ O: U! M( s2 Z2 L' y5 o! Y
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- Z/ X. e. d0 l' }5 T
;; and initialize the traffic lights to one setting4 N; `: ]5 k+ V8 Q
to setup-patches
/ @- x, ^4 |* w: ^ ;; initialize the patch-owned variables and color the patches to a base-color9 d( ~9 o. _ _8 ~/ [
ask patches1 q( s1 ?6 T; G' ~ `( b$ C2 G3 g
[" G$ j( B! K& C$ O& E
set intersection? false) Y7 E' g+ C# S# Y: P
set auto? false$ B- E' N( X8 C+ Y- c
set green-light-up? true1 ]$ `, h. `/ F- ?
set my-row -1/ P! W* @5 S6 w
set my-column -1
: @: H0 F& x- o6 v3 Y# q C set my-phase -1
7 I+ n" T2 j" O1 x3 c set pcolor brown + 3
5 _: b/ p8 D- f p ]
. j" Y7 _7 `( R7 b
6 t& z4 V) G1 m7 ]& ~ ;; initialize the global variables that hold patch agentsets
p! |# B$ |7 {6 L% T5 b set roads patches with
; J0 i2 q# N: X4 _7 C, P" G8 V% \, f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& X! V$ v8 r" [4 C- q$ j, d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; j3 @. c) U: r4 v9 b
set intersections roads with
6 P1 x3 G1 a. X8 |+ O: a @- z$ O3 U [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 q/ k5 y# f k7 U$ X (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 Y0 I9 D4 m$ T5 M
4 N! [& x. s! `. f. S* u ask roads [ set pcolor white ]& l% B8 N( F6 p" E9 A4 F
setup-intersections' v+ Y& s, ~5 m+ Z! P6 A
end
/ \- T) ~3 v, V( O: C" ^其中定义道路的句子,如下所示,是什么意思啊?8 C" F# [' D( l7 `4 v5 Q4 x
set roads patches with
6 M9 K& f3 p# ]& D2 S, | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, f2 P c, `( b: M# ]! N/ C- X (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 z2 G# u' u+ W0 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? |
|