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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 p6 \# |9 s5 f" Z9 d5 W
netlogo自带的social science--traffic grid这一例子当中,
6 O9 C6 _$ C* kglobals% {5 E5 P+ R" M- y" l: s/ j$ A% {
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grid-x-inc ;; the amount of patches in between two roads in the x direction
' _! c9 r( R; z grid-y-inc ;; the amount of patches in between two roads in the y direction2 a/ y1 b+ V9 B4 b6 X- i; r
acceleration ;; the constant that controls how much a car speeds up or slows down by if) K; l9 Q. C/ A2 G; r
;; it is to accelerate or decelerate
) p1 h1 Z# ^" m/ [ phase ;; keeps track of the phase
! n+ Z8 N' X, T' G% l: S ? num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
2 g e, P T+ p$ b B' Q current-light ;; the currently selected light" c7 o: d1 N4 a: M0 \6 A _
3 ~5 `7 u: ?1 f3 a ;; patch agentsets9 I- V) k: y N" i1 d( Z- N
intersections ;; agentset containing the patches that are intersections
# q7 F/ g0 x% ^: Y roads ;; agentset containing the patches that are roads1 b3 D5 I+ {$ E$ x3 R
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turtles-own
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speed ;; the speed of the turtle) m7 H7 m/ D- R$ k
up-car? ;; true if the turtle moves downwards and false if it moves to the right* ^) k5 u: F, ^0 h/ M( b% J
wait-time ;; the amount of time since the last time a turtle has moved) [7 s( n, R( b0 V, |! L7 Z+ H
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- i$ H* v1 J+ O D& apatches-own3 }* m" D2 U+ O
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" y$ }; M* D* ^1 N1 y" O) r intersection? ;; true if the patch is at the intersection of two roads; v) t' n* x/ `$ r, `9 X; F/ o
green-light-up? ;; true if the green light is above the intersection. otherwise, false.& F5 h$ Y) S/ f4 x, ?( |+ O$ u
;; false for a non-intersection patches." M5 D& ]& P6 R/ A1 f3 B
my-row ;; the row of the intersection counting from the upper left corner of the
9 Y' ~# _0 k3 I6 m- K' T! b4 N ;; world. -1 for non-intersection patches.
0 l+ j: J# c! ] my-column ;; the column of the intersection counting from the upper left corner of the
- o. Y7 I( a* m0 s" ~5 P ;; world. -1 for non-intersection patches.! E3 S* Y6 Q/ ^' ^& K
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
5 H. F/ H( O" }' ^" a auto? ;; whether or not this intersection will switch automatically.
7 m$ L; T' T6 h1 n ;; false for non-intersection patches.
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6 V! ?& |& f, [% W1 N1 a$ Y;;;;;;;;;;;;;;;;;;;;;;
5 w+ z, ~* Y% s, {+ I# e- m;; Setup Procedures ;;% g% f! K4 |% j$ `" ?
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
4 `) O7 R5 C* \4 P;; Create num-cars of turtles if there are enough road patches for one turtle to
X5 d. `3 `; J. ^. w2 `+ }& m4 {;; be created per road patch. Set up the plots." R9 L2 b. }- N% a+ W9 E% D/ ~% J
to setup2 {# Q6 j$ `1 n. k; G- Q; }. U
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setup-globals( h8 ]$ c7 ]$ R
2 j: S0 I1 ?8 N* l ;; First we ask the patches to draw themselves and set up a few variables; h# _" z! Z2 r" J$ r( W$ U4 ^
setup-patches
4 u: o0 r A; v% I make-current one-of intersections& L, u% _; H/ G* @
label-current% e6 ~/ s- v& }$ |2 a
1 F7 k; V; g& Q) ]! O) a6 `; `1 ~ set-default-shape turtles "car"
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if (num-cars > count roads)
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1 u; ^7 ?: V$ j% O1 ?' b( K user-message (word "There are too many cars for the amount of " T7 _: \) \. @- i" {7 _
"road. Either increase the amount of roads "
; r* x' S3 {* R% m "by increasing the GRID-SIZE-X or "
$ Z" N P4 L2 F$ R "GRID-SIZE-Y sliders, or decrease the "
, U! C K4 K2 X, w: ~2 U "number of cars by lowering the NUMBER slider.\n"
( [& Z$ q0 c7 X5 `5 G "The setup has stopped.")8 J: L) @3 Y' y, S0 W" i
stop$ f9 X" k5 Z0 g1 [0 z
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% I# ]. ~0 l7 R; A9 |2 n ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 G7 r- [5 U8 J. C& o+ d0 X+ W* j
crt num-cars+ m5 Q- P) y" \8 h
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8 W7 P t3 `( l; I" o" k- p4 P( `& {6 v5 S setup-cars
8 G9 g, w/ J/ U( m# ^ set-car-color r; z( m$ Y% b9 Y; C1 U, J3 G
record-data
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, j$ h8 s% F) b3 \ ;; give the turtles an initial speed# z- ?) [" |, R. w
ask turtles [ set-car-speed ]
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% N, G: i! H# L2 N5 E reset-ticks) t! S9 v& v, {+ n. U) I2 t/ D
end% l( n; X2 f( a) }5 g
& R) n. L( m5 D5 V8 T;; Initialize the global variables to appropriate values2 o* v5 d3 `6 ~! j, S
to setup-globals# B4 G% F. E5 @) G0 S; ^3 \
set current-light nobody ;; just for now, since there are no lights yet& l% `" P1 T4 V5 l! p
set phase 0 Q3 L2 g4 }8 X' Z1 Z0 F
set num-cars-stopped 0& Q8 r2 S9 O- Q. |4 }' C
set grid-x-inc world-width / grid-size-x( I% b" H; x4 E7 I0 e' o0 O' v
set grid-y-inc world-height / grid-size-y+ X3 c. X$ A9 t1 b( _7 N& _
1 i/ i8 |0 T r0 ~ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& f7 N7 u' K; } N" D# W, w
set acceleration 0.099- I3 ]. G7 t' H
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets," w; [) Q$ o8 \6 ~9 S G* _' r
;; and initialize the traffic lights to one setting
- p( h0 s S* wto setup-patches
- E( ~9 v5 E+ j ;; initialize the patch-owned variables and color the patches to a base-color
- l' N+ T: x. ~7 h; b; K* g ask patches5 N: }' j$ ^" _+ V: u* C! w
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set intersection? false
3 E b0 j- t9 j0 v5 q set auto? false
$ ]/ f9 ]$ A: Y3 ~) o B7 z set green-light-up? true
/ y5 c6 |7 q: }9 b5 V! E1 _/ x set my-row -1$ o6 k& f4 c$ `* @
set my-column -1
$ `1 E- V& {9 Z set my-phase -1
, b7 l# M# O# s, R& x4 P, u set pcolor brown + 3/ D8 R# W7 x; v3 m- n e
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;; initialize the global variables that hold patch agentsets; I$ }5 @' o2 t9 |8 `( J
set roads patches with
. e5 e3 A5 y0 ~5 y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% Q [. S, y% T& p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. W. ]8 ?) ]: U. N/ y set intersections roads with
$ [* H! d5 b2 G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. b) h' ]4 x# _. N+ ^, f5 M: T9 G# `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 I& F$ p& w) s; k
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ask roads [ set pcolor white ]) O* k5 A6 w2 J4 s* |% A1 P1 Y
setup-intersections
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2 `$ I& O9 Q% n3 J$ q& x其中定义道路的句子,如下所示,是什么意思啊?
7 v# f1 D7 G/ t( B L* a set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 G8 y( g t5 G3 Z/ D5 V0 d
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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