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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。7 ^3 @" \& B+ C& {3 n6 F
netlogo自带的social science--traffic grid这一例子当中," ?5 o3 W E) K
globals) \; l$ x: ^) W# T8 D# |
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grid-x-inc ;; the amount of patches in between two roads in the x direction/ _% E, Z! e; I
grid-y-inc ;; the amount of patches in between two roads in the y direction$ N4 K Q) H& {5 Z7 n, c5 @( A
acceleration ;; the constant that controls how much a car speeds up or slows down by if
0 I/ s2 t' G* ?3 D$ W' F2 E) { ;; it is to accelerate or decelerate
* `( ^4 i, K- O' p% l/ _ phase ;; keeps track of the phase1 }; n2 Y( J% Y( P+ g! J N3 h
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure; I0 [: q9 E- y$ H
current-light ;; the currently selected light
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$ s+ u- @$ U4 A- n0 K: U, t4 W ;; patch agentsets
- O) E9 g. E3 P: j0 r# v intersections ;; agentset containing the patches that are intersections: J8 e( F4 d4 A
roads ;; agentset containing the patches that are roads; J( p; a# B% k
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turtles-own, g8 u% I' k% A, ~
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speed ;; the speed of the turtle+ O0 z3 `# R8 k2 H; U
up-car? ;; true if the turtle moves downwards and false if it moves to the right
% e8 g1 j5 P" w wait-time ;; the amount of time since the last time a turtle has moved3 f% w# Z2 S. O$ y% r
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patches-own. ?; k3 v* ^! j
[
9 D3 ?7 \5 v5 Z7 l+ U u; \ intersection? ;; true if the patch is at the intersection of two roads
! n8 o" L) G) j y green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' Z3 M# F( N! H$ N7 i3 w6 h ;; false for a non-intersection patches./ T1 X: J1 W( i# V8 N
my-row ;; the row of the intersection counting from the upper left corner of the- h v1 s0 K& G1 U
;; world. -1 for non-intersection patches.) J3 D4 D( H5 F2 k1 g
my-column ;; the column of the intersection counting from the upper left corner of the
" {: ?% X9 i, ], W' p1 ` ;; world. -1 for non-intersection patches.1 ?/ h, e8 j% m& p. b: ^* D) V1 c6 W
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
5 V! H9 ]1 \6 Z( f( ^, m3 `* a auto? ;; whether or not this intersection will switch automatically.
% i+ F. }0 `3 Y9 j$ _6 r8 @, b! {2 w* B ;; false for non-intersection patches.3 l# P/ ^ c" X3 @ b
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;;;;;;;;;;;;;;;;;;;;;;0 w& j- W0 w; j4 a' w
;; Setup Procedures ;;% H+ B- b* W8 @8 x! {7 ]" t
;;;;;;;;;;;;;;;;;;;;;;# Q0 E3 \2 `' n4 u; P- Z7 D2 F
# H( D9 | D5 l) q$ r, L;; Initialize the display by giving the global and patch variables initial values.
6 M: T/ H* Z9 b# _2 S;; Create num-cars of turtles if there are enough road patches for one turtle to
# O& n, B3 g4 _' x/ o! I- s% d( y;; be created per road patch. Set up the plots.
/ S8 \, A. W9 A t& l9 q) `. @to setup
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: X$ A# w$ J. ?# i& j setup-globals* \# Q9 l+ Y5 _6 X- X& O f s
- J" i; W7 k0 ^) r& f ;; First we ask the patches to draw themselves and set up a few variables: d$ I% O: s, R# I
setup-patches
% M# x1 ]" c# k9 B5 P% N0 e make-current one-of intersections! r1 K. ^: P1 V/ y' I* E
label-current
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set-default-shape turtles "car"; P2 i; x( X5 p
/ @3 M9 U/ R" p( \ if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
7 @* u: X4 o; a* s( c0 _5 l0 U "road. Either increase the amount of roads "
( n+ Z7 B, L" u "by increasing the GRID-SIZE-X or "
9 T2 V" |7 S/ E! ` "GRID-SIZE-Y sliders, or decrease the "4 a8 t& |6 _* q7 M( y( C
"number of cars by lowering the NUMBER slider.\n"8 z4 v( ?3 y4 z" W6 L
"The setup has stopped.")9 b% p- C( x5 Q
stop9 u$ v. [' f g- A" I, ?
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 {9 v( x& ?! z R
crt num-cars' H2 S4 ? G' F/ P x4 U% Y
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setup-cars
: n' L% J }: k( R- w4 K5 L set-car-color a0 M. ]! }* a/ g% n9 @" I
record-data
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1 ~! N- S& R/ _, N6 C! e ;; give the turtles an initial speed& u" T! l9 @. y( w0 e8 Y0 w! U1 _( r
ask turtles [ set-car-speed ]# A" D ?# h$ f% v
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reset-ticks
9 C o6 I& |% J6 {end
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: ?" f, j+ x3 a4 `& e4 |& A;; Initialize the global variables to appropriate values" p1 p# G/ ?1 b; V3 p6 M$ ^7 t
to setup-globals. Q- G# M* a2 Q/ ?
set current-light nobody ;; just for now, since there are no lights yet
, B- z6 M$ \* ?, R+ C8 E9 y# B9 ~ set phase 0
1 J& w0 ~& h4 ^9 z4 [2 N: `4 m set num-cars-stopped 0
2 D- P* u1 m% [, b+ G5 W" S p set grid-x-inc world-width / grid-size-x
& \% q, S: k; W0 ~; o: M set grid-y-inc world-height / grid-size-y( m3 X& ^- a7 v: D5 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+ [! e ?0 Z E: L; U: }
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- S- n0 [( U' S7 e* v
;; and initialize the traffic lights to one setting: M# h/ q. n1 u. X9 x7 Y! K
to setup-patches* ~4 f, ?- ]$ l* F6 D
;; initialize the patch-owned variables and color the patches to a base-color8 ]. k8 [3 N5 k: M: n
ask patches
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set intersection? false* x& n4 D7 B4 f, i- z
set auto? false
" g5 C( a; n! B2 I+ c+ S& O( c set green-light-up? true9 ]& W+ w7 Y. x8 S, z& d
set my-row -1+ _, ~' N4 G% c4 p
set my-column -11 q' g( a" U3 U: m# y# j) U2 u
set my-phase -1
9 b5 Y7 A# _! V/ z& q4 z set pcolor brown + 32 _. H J' M& A1 c: T7 @5 Y
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;; initialize the global variables that hold patch agentsets
4 W+ H+ t, X$ K! e% D& B set roads patches with
% v) B$ e! ?0 ^ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 v* b5 z' j6 `6 h
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ [# x; N& n- ` C6 Y
set intersections roads with; A& f4 Y: `% q" v; a% D
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and% P# G- y6 L: n- W( [/ m1 j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! A7 l% r) t" ^' D' B1 j" W
1 v' ~9 L$ M- g, t- N- r. B ask roads [ set pcolor white ]
! M: z8 J: z) X2 k setup-intersections. u( ?' F& `8 Z4 B0 k. D
end
# ]- B/ S! z, s其中定义道路的句子,如下所示,是什么意思啊?+ T: R) B; c2 g( [4 r4 r( C0 o8 a7 S
set roads patches with
( H s2 W3 f; A h [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. N; J3 M) b& V) v; _6 w
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; n2 X }; ^9 L( l: v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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