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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。
5 W( m4 r$ @. {; n2 Bnetlogo自带的social science--traffic grid这一例子当中,
' I+ V( W+ `2 X# y3 W& hglobals
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5 D5 A1 P1 i' u' T2 J/ m% c grid-x-inc ;; the amount of patches in between two roads in the x direction1 u! N, X7 D3 ~8 h% z! \& r
grid-y-inc ;; the amount of patches in between two roads in the y direction+ ~6 Z! y, H2 I/ z u
acceleration ;; the constant that controls how much a car speeds up or slows down by if ?7 C- }5 j3 b9 D( r. K; ~5 E
;; it is to accelerate or decelerate8 ]" I% j* v p" U7 r1 X6 Q
phase ;; keeps track of the phase+ s) y* ?" Y2 _1 g6 m& r. P
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( n9 H* P6 ^; ]; `
current-light ;; the currently selected light# @- ^" j' m- n, F
! H4 y' n5 A+ j ;; patch agentsets
9 g; k4 \( g% M& r% f2 q; m intersections ;; agentset containing the patches that are intersections
4 J8 ^0 a* Q1 ^7 R2 \ roads ;; agentset containing the patches that are roads
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9 H" s) V( [0 B$ h9 Iturtles-own
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speed ;; the speed of the turtle
. J' P0 t! P2 w5 Y: A8 ?* ^ up-car? ;; true if the turtle moves downwards and false if it moves to the right
3 C4 F* H) a: P! I) K4 U: {2 T wait-time ;; the amount of time since the last time a turtle has moved6 v; m0 ^) l: G, O9 _" {
]
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1 O8 \5 @: ]9 ^8 d5 kpatches-own
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2 c2 t$ p9 X4 }" _. z" v intersection? ;; true if the patch is at the intersection of two roads
* b3 T: C- j" s g7 V# w% H green-light-up? ;; true if the green light is above the intersection. otherwise, false.
: ~) P5 z9 M7 G$ Y ;; false for a non-intersection patches.
" z: {: r2 {1 v3 R" W9 V+ m my-row ;; the row of the intersection counting from the upper left corner of the/ ~6 j3 y* O# @5 D
;; world. -1 for non-intersection patches.
* U1 J! r! o5 R my-column ;; the column of the intersection counting from the upper left corner of the( n' E5 t% Z1 c/ ^! V$ i
;; world. -1 for non-intersection patches.
+ L2 Q1 M# E0 W" V1 M my-phase ;; the phase for the intersection. -1 for non-intersection patches.
# ~5 _6 F* Z \) h, i( y$ o1 l/ |. ^' ~ auto? ;; whether or not this intersection will switch automatically., ~" G" c- R/ f; ]9 ^' t" [1 i
;; false for non-intersection patches.0 t6 h, q+ ~" e8 Z3 a9 t) j+ M
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, ?) W: z4 V- s! t# X;;;;;;;;;;;;;;;;;;;;;;
6 V+ E2 x1 Y5 y1 S9 J: L, i3 j* g% |;; Setup Procedures ;;
7 A+ |6 w9 ]: a' ];;;;;;;;;;;;;;;;;;;;;;
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" r3 g4 v( t, |- R1 c# f3 R;; Initialize the display by giving the global and patch variables initial values.1 @+ ~3 a d5 T
;; Create num-cars of turtles if there are enough road patches for one turtle to2 l7 G% s4 k& }0 N
;; be created per road patch. Set up the plots.
/ U$ } L, H. F$ ?* bto setup
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' X8 y, |* C6 ^* m: } setup-globals) u% h) s8 @4 {3 C& M3 i2 ~
- X2 W+ _6 p7 w8 V ;; First we ask the patches to draw themselves and set up a few variables8 p C, L+ q7 O( E
setup-patches7 O, E/ l" w) g$ j% c
make-current one-of intersections
+ V- e1 ^. }9 K2 c6 Q5 _ label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)
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* B# G7 @. f" T X; W user-message (word "There are too many cars for the amount of "& v' D. G* i' a& C0 I- Y& X: K+ [2 n0 @
"road. Either increase the amount of roads "" M% z% _6 W* Y" P% W) X
"by increasing the GRID-SIZE-X or "
$ b% S: V2 T, o% e "GRID-SIZE-Y sliders, or decrease the "
2 x4 z: }* O$ U" c8 j! f4 g/ n "number of cars by lowering the NUMBER slider.\n"
6 n! Y% @( Y* h6 e' i "The setup has stopped.")
8 G. I- U$ K' W1 z& d: x stop6 v \4 ]3 l* Z6 F9 q" |
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( ]: s( q; v1 t* |' O4 Q4 G0 W ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 J a& t& m0 @8 |1 s. y& \7 _
crt num-cars" S3 [1 v4 i/ _7 C
[
% H; l5 P! L2 V6 O, _ setup-cars
& [' ^8 A* l7 s% w; z$ B set-car-color
- w+ x# `: Y9 e+ _. l4 _ record-data
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;; give the turtles an initial speed4 B( f" ^& t" w8 B3 M/ X2 }4 v
ask turtles [ set-car-speed ]! t- h5 p9 G& u! H. Z2 o0 O2 y
: e1 i. s0 B# j* p3 n reset-ticks, L' w2 w. N3 Q* c( A. f
end4 y! u& V, L& a- Z! @( S
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;; Initialize the global variables to appropriate values6 L9 ?6 b& k& g0 T; q4 I8 o
to setup-globals' j' m3 `9 u3 }( e
set current-light nobody ;; just for now, since there are no lights yet2 K. E% I! R i! `* `
set phase 0
0 r* l" x4 _7 R. g6 l7 u( L set num-cars-stopped 02 H% G0 l9 A: S" U: N
set grid-x-inc world-width / grid-size-x6 E: }+ K) u2 S2 u
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
( u3 ~& |& Q3 c$ ^ set acceleration 0.099/ G4 B* w o" ?3 g: k
end/ v o7 R2 p" F1 |
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) f. ?3 _& S' X" C$ `
;; and initialize the traffic lights to one setting8 ` S7 {! N. B/ Y" _
to setup-patches
+ B4 b- @% W. ^0 G; \8 {; u ;; initialize the patch-owned variables and color the patches to a base-color8 s3 W0 n' t' q2 Z4 _9 E: P
ask patches8 F7 f6 O0 G( z5 [0 I+ T
[
7 O: b: L) ]2 R) O6 w) M set intersection? false, }0 _4 U7 U9 Z/ W: _2 q1 |+ G
set auto? false# p8 M$ x! c& L+ _$ z: g6 C
set green-light-up? true1 x. ~. t F2 X |
set my-row -18 X1 u" d3 w+ I% H
set my-column -11 V7 q, K! N9 J @ {
set my-phase -1
9 w1 U$ | J$ B K. p. Y set pcolor brown + 3
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3 @' R- c! R* m7 ^ ;; initialize the global variables that hold patch agentsets
* P6 B" a3 |: N! a, E set roads patches with
8 W; x: Z; h. W6 J5 ? [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 J, J6 G; L+ b- C4 i8 L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- x* [# q' E! {2 w/ A) f; i set intersections roads with0 J0 L1 W' b6 d% f6 _7 s; w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
% I- P, Z0 E! [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
6 Q2 ^0 p! v3 y) @ setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
8 E. d0 E5 g. Y9 k7 Y% s set roads patches with
3 x- t! Y, n" A3 x% \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, F, J Q! m- S# s* h: [9 o( r (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& r9 Y) z' H- O# T* t+ ^' H
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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