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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。
i$ Q6 [/ @2 a8 d2 a4 Rnetlogo自带的social science--traffic grid这一例子当中," f& T) y6 r7 r: h* g
globals% w: Z0 A* W) O! E+ A
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: | @: s; @) r o- r2 ^ grid-x-inc ;; the amount of patches in between two roads in the x direction
; [$ p2 a0 g& e+ z' e grid-y-inc ;; the amount of patches in between two roads in the y direction4 Y H$ q; m, \
acceleration ;; the constant that controls how much a car speeds up or slows down by if
! Y9 Y# E# _+ C ;; it is to accelerate or decelerate
/ j$ d5 ^: {- Z+ O phase ;; keeps track of the phase
8 u; |% U( |+ C* P% p/ j num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure! ?6 S' M$ z- O: u$ y
current-light ;; the currently selected light
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;; patch agentsets. ]5 o) P( X: h
intersections ;; agentset containing the patches that are intersections/ [- S9 l9 J# {# z' G
roads ;; agentset containing the patches that are roads
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' x/ ]; n. A7 S! g8 Iturtles-own( l. e; q8 A- X
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speed ;; the speed of the turtle
8 `% b* s5 U4 O/ Q" h; ]9 k up-car? ;; true if the turtle moves downwards and false if it moves to the right
1 b- Z3 B! a4 P8 b7 s! d7 G& S: o wait-time ;; the amount of time since the last time a turtle has moved
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2 ], ~& Z& @( A* d% [7 @3 e3 L4 C5 dpatches-own1 L; k, X1 x- _5 ~
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$ u: l X6 i2 Z& T; ]! r8 N/ J" d intersection? ;; true if the patch is at the intersection of two roads
) K) F- P- ~: M green-light-up? ;; true if the green light is above the intersection. otherwise, false.( Q J: r8 X; c( K8 b, i
;; false for a non-intersection patches.
! s& }4 i: ^8 O my-row ;; the row of the intersection counting from the upper left corner of the
( d% C% o/ ?2 S6 G7 T6 a- w0 k1 y5 ~ ;; world. -1 for non-intersection patches.
" J! ]0 P p2 H% i- q- N3 _ my-column ;; the column of the intersection counting from the upper left corner of the
2 {: `. }: j/ b0 p ;; world. -1 for non-intersection patches.
5 n8 I" |) \7 c9 X my-phase ;; the phase for the intersection. -1 for non-intersection patches.
- j5 }' E* k2 h) o auto? ;; whether or not this intersection will switch automatically.
y! ]# Z0 E D2 v2 u5 h ;; false for non-intersection patches.8 [8 l% D* p. B
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;;;;;;;;;;;;;;;;;;;;;;
1 q( l: g% o2 h$ e" D/ F;; Setup Procedures ;;
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2 a0 e) H, R3 \# F3 R;; Initialize the display by giving the global and patch variables initial values.
3 m7 d8 u* N! s, C* N, J;; Create num-cars of turtles if there are enough road patches for one turtle to+ A8 E! A. y0 _ y* c. z. X
;; be created per road patch. Set up the plots.
0 p# ~6 p4 d9 cto setup6 _7 _3 [3 `5 Z
ca
7 W, m% J, b" G+ o setup-globals
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! @; K/ t: c0 _! Q ;; First we ask the patches to draw themselves and set up a few variables
1 H& {9 L( `2 o: x( l4 g# F setup-patches2 o& C1 c% l# N D$ Y+ r6 s$ P
make-current one-of intersections
+ |+ W) O( M2 h label-current# B: N) S% V7 a2 g: @
' S- u7 |/ Y8 X& |0 q/ _7 ^' Y set-default-shape turtles "car" [2 F- r7 Z) Q6 o. r0 x$ x
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if (num-cars > count roads)& Z( S$ L( h' N7 J7 H
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user-message (word "There are too many cars for the amount of "' @" X `- C. t; C5 f6 e0 Z, n' S
"road. Either increase the amount of roads "
8 L) `. q5 h) c. h$ g3 K9 G "by increasing the GRID-SIZE-X or "6 j* E8 T; Q& }3 w( d$ J" e4 Y
"GRID-SIZE-Y sliders, or decrease the "
* Q: q. d e: `: V l- p2 O "number of cars by lowering the NUMBER slider.\n"
) ~4 m7 G( H7 I9 g "The setup has stopped.")6 Y' g. D& m5 B3 X# b
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ [' F( t3 W2 ~# l. C8 _ crt num-cars
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; E0 q, g; o l' ~ setup-cars
E! C/ I: M6 o set-car-color ^; Z! m$ ~+ T. `
record-data
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;; give the turtles an initial speed
" }. n1 I- f- p; j2 w' Y6 _$ \ ask turtles [ set-car-speed ]$ Z s" d; o; _7 h$ G; C
$ X4 o& o2 _, i. @+ S reset-ticks8 Y% t* }9 F, ?2 N
end+ m9 v( N2 A2 J' P
- d7 K+ }4 n! w3 E. N* V;; Initialize the global variables to appropriate values
8 i7 \3 o0 t5 yto setup-globals
6 i, Z8 Y: ?& V' E set current-light nobody ;; just for now, since there are no lights yet2 _+ Y. L. o* ?0 [$ U9 @; w
set phase 08 F1 D* v- t! @ I- c" X
set num-cars-stopped 0
9 |0 W4 j" B; }2 W4 W7 z set grid-x-inc world-width / grid-size-x2 D1 L/ D/ [- ]1 E q
set grid-y-inc world-height / grid-size-y
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; J5 l$ j8 C6 p }) P7 z1 X$ ]' y ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( `, q( a& E. U7 _5 z9 |, v% s
set acceleration 0.099
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! Y$ L0 X3 J' e/ L;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 M+ k5 E) [ F) x% |; n;; and initialize the traffic lights to one setting5 x: ^) y# t3 }0 u
to setup-patches
+ u7 p1 J b3 x2 c X( N% j% h ;; initialize the patch-owned variables and color the patches to a base-color
5 }! _# }) j/ V) j% e ask patches) l# ^ [; ?$ z+ m7 a- O
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set intersection? false1 n" s7 e' l2 W
set auto? false
/ `( K" }5 U+ W set green-light-up? true
1 Z; @6 k+ A/ D( v) j3 t set my-row -1
, U" L) @5 ^& F: U. e set my-column -1 ?1 {0 P9 V) u6 a
set my-phase -1
7 M @" V$ J* V1 J3 R) b. b5 U set pcolor brown + 39 k8 I8 K" ~7 i& l/ A
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8 D M) d: B1 H% U" @- r ;; initialize the global variables that hold patch agentsets6 p, b9 @ ^0 a' |6 C4 ^, d# a% K
set roads patches with% E6 m8 O1 J/ k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 l1 ? i2 X4 T$ w (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ y1 c$ H$ M( Q& E1 J; d set intersections roads with
5 s: q, Y$ a- F/ n" ]: M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; l0 \3 ?4 I& e% s6 e, o+ F: F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% Q9 \; w& L2 S: o6 y! l
5 |. {6 I6 _! r( E4 ]0 ]6 A ask roads [ set pcolor white ]* z9 E- }$ x% V) F% Q
setup-intersections
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$ d1 j& g. [2 F其中定义道路的句子,如下所示,是什么意思啊?
" d- U8 K- M7 L; w: ~: P set roads patches with- ]8 }. b4 W$ r2 H( F% C. x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" H7 U5 Z' B P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' o6 w/ E6 U! o, L+ w7 T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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