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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。
) B5 P( [4 G1 R# v8 {+ ]netlogo自带的social science--traffic grid这一例子当中,9 o5 W% W% Q! h* v" p- T
globals3 H0 ^5 q2 F6 K1 Z: c) `) |& B5 b
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2 e/ F/ O/ N; S" ]% I; e; k& A8 q grid-x-inc ;; the amount of patches in between two roads in the x direction& ^, v+ _- ]1 o1 @
grid-y-inc ;; the amount of patches in between two roads in the y direction' t# P' Y9 ^( V- Y: w8 [
acceleration ;; the constant that controls how much a car speeds up or slows down by if# s5 T; Y) I, z% i6 a
;; it is to accelerate or decelerate
( i* u: ]0 @* k$ V5 u' u \ phase ;; keeps track of the phase
8 z! G) Q0 I0 F4 h9 V( H9 f7 k num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
3 Z3 G3 _) P" M8 u current-light ;; the currently selected light
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;; patch agentsets
8 |1 r9 F8 ?* H9 E9 T intersections ;; agentset containing the patches that are intersections# O; D% |" q: c$ P s) z |# U' E; X
roads ;; agentset containing the patches that are roads) G( V6 T3 W, ~
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turtles-own: r- _% `% S& f3 V& U
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speed ;; the speed of the turtle" m) |; c6 j6 t1 `0 H
up-car? ;; true if the turtle moves downwards and false if it moves to the right
h( R5 w+ n w& V5 r: H* ~ wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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; p! V N/ x3 y/ K- z5 ] intersection? ;; true if the patch is at the intersection of two roads
+ N1 n1 `7 |2 }2 j h green-light-up? ;; true if the green light is above the intersection. otherwise, false.
5 \: \6 h$ J( r! n ;; false for a non-intersection patches.
0 Q. @! {8 j: d my-row ;; the row of the intersection counting from the upper left corner of the: x( {5 G- E# |, D) K2 c
;; world. -1 for non-intersection patches.- w8 X# r9 C& x! ^( K w& F1 w
my-column ;; the column of the intersection counting from the upper left corner of the: O8 Z- p0 \/ a/ V* Q
;; world. -1 for non-intersection patches.
2 A2 @3 |" _) O9 x i my-phase ;; the phase for the intersection. -1 for non-intersection patches.( [7 |. v1 O6 k* |" y- a! R
auto? ;; whether or not this intersection will switch automatically. N- r4 Y9 {5 s9 s7 b% k
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
2 n8 d3 C. W( B/ i* m5 R;; Setup Procedures ;;! q; }+ m, q# N, w X4 f( H% k" H
;;;;;;;;;;;;;;;;;;;;;;# y( \' B% a5 A8 O. j9 x% O: l
9 S1 M! x, i) e) m% H;; Initialize the display by giving the global and patch variables initial values.9 t+ ?$ C' c. K) P) }3 O5 i
;; Create num-cars of turtles if there are enough road patches for one turtle to
8 E3 I9 D) c9 i% d4 B, a2 D;; be created per road patch. Set up the plots." Q. a$ j6 n' k) b& `+ Q, O
to setup
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" E1 ^( T' n5 G+ l! D: n, B setup-globals/ `/ s2 b+ |" K& p
6 [; Z. K$ e- L5 a. x ;; First we ask the patches to draw themselves and set up a few variables* _. N; n+ [0 e- ?# K
setup-patches
( ]/ [- s0 ?# W0 V% ^6 G9 a! f make-current one-of intersections
S1 B, S5 ^. s# G% @/ C label-current+ b+ T, [) |2 | I7 m9 G# D' Q
6 N8 V0 c) e0 K6 ^ set-default-shape turtles "car"
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if (num-cars > count roads)! h1 [# l6 \8 b, Q/ j+ s% v) p
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& G& ]( \: r- U. A% ^ `' Y user-message (word "There are too many cars for the amount of "
; }$ g" P# u, p "road. Either increase the amount of roads "/ M% S5 y7 A! F5 |2 ~8 l- v2 J! O
"by increasing the GRID-SIZE-X or "
. O& r/ L% W3 a. L/ Z q! T& ] "GRID-SIZE-Y sliders, or decrease the "! H7 @* \( V( M* y& j4 d: o2 V
"number of cars by lowering the NUMBER slider.\n") j8 ?2 _3 u' \8 U* g/ o- ]
"The setup has stopped.")
' r/ ?3 N6 a- k4 N2 r+ P+ Q: u stop
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( f0 I( J3 j4 C, U. V& z( { ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
T$ M; `' P, X crt num-cars8 ]* [5 l* P. N) n
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8 {5 T# Q: ^0 x# }: G setup-cars
' u8 v0 y* R9 v! l, J" ?4 a, _ set-car-color
8 o& K$ h* m; V- I$ ^ record-data# d% d! t" T8 ?' b' ~5 U ?; A
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8 Q! H* R6 V9 \5 }$ X ;; give the turtles an initial speed
1 a7 N+ X6 ]" v ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values1 W% h; r4 @ I% ?% t! y0 T5 z- d
to setup-globals
- Z1 ^7 j. _' v3 X set current-light nobody ;; just for now, since there are no lights yet, y/ x: H, O: R: w9 D
set phase 0
: Z' Z Y1 ]# c* v B set num-cars-stopped 0; {) [2 d1 g5 N6 g: b
set grid-x-inc world-width / grid-size-x/ @7 d8 m0 ]% u8 i
set grid-y-inc world-height / grid-size-y( l4 a4 Q: M _& p% z" L/ g
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' h& `$ U- R0 |
set acceleration 0.099
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( w3 L9 k/ e' k9 M+ o0 i x;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& Y! p2 {( ]1 U$ n, V7 ];; and initialize the traffic lights to one setting- n/ `9 D: Y+ v) T5 ]. S* f
to setup-patches
2 I3 {( i! }6 M; @) Y) H# F+ z$ G- v ;; initialize the patch-owned variables and color the patches to a base-color
0 E' E* r& o: ?& z ask patches$ M) n+ B4 Y2 b/ d8 D
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0 b5 @% y9 m4 j( E5 y, b7 r set intersection? false. W! s+ |% J) M* M/ R- f
set auto? false
. o7 l7 Q, C! K1 l4 @+ F set green-light-up? true9 m8 H) m3 Z; ]' }1 p( u8 b+ ?, j( {/ R
set my-row -1
/ h6 Q# U! e5 r# M3 D4 g set my-column -1" e8 p9 j( C6 ~! D
set my-phase -12 ]* v+ p8 ]/ L) Z: F: O- a+ @
set pcolor brown + 3+ _; f) J' D2 X! t& t
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;; initialize the global variables that hold patch agentsets9 a+ ~# p% B7 ~8 D
set roads patches with5 e! {% R9 h, V: @ X1 `- {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. ?: Y# P: q; f s: x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 A$ J5 n( y1 Y- T3 w7 h( J
set intersections roads with+ g$ X$ W t. I+ x% c( K, c3 O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( Y% v" E8 R$ W j& ]! D$ h (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?
' P9 t! q r: W q& D- ~: { set roads patches with) D7 P! x& \" f+ j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or N; S0 ?& t3 d% I3 {; S7 k$ p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 f+ f5 b' B; n
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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