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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。6 J' V& N- ?/ ~7 P
netlogo自带的social science--traffic grid这一例子当中,- N, S0 w- L* P3 M$ l6 X; p
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
4 f& L. m' ^' l/ e grid-y-inc ;; the amount of patches in between two roads in the y direction
% g( n0 \+ Q+ I/ r; P acceleration ;; the constant that controls how much a car speeds up or slows down by if3 u/ U8 n) c- X! ^$ ~
;; it is to accelerate or decelerate$ K4 X1 t% h- ]8 V ?6 Z
phase ;; keeps track of the phase
2 w2 R W* A. b2 }. F4 ^* R num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure2 [# F. r+ c+ H2 K6 H, T3 W6 Y9 J
current-light ;; the currently selected light1 x4 g( p# }$ ^$ R$ q$ ]: |# t
. V) }& h. B: q! t ;; patch agentsets
m8 i: W A) y3 V0 B) }9 r5 u intersections ;; agentset containing the patches that are intersections
; p. Y) |# K! P roads ;; agentset containing the patches that are roads0 h+ c: x0 V/ s3 N3 a- a; g
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- r; |# L. k8 f% G3 w7 ]% Y5 H4 `turtles-own
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: n3 b- C f' |) T speed ;; the speed of the turtle
$ l; M. f% ^. |' g5 B1 Y up-car? ;; true if the turtle moves downwards and false if it moves to the right$ o6 q" d4 q6 A* S, q1 w. b, \" _
wait-time ;; the amount of time since the last time a turtle has moved/ l. J# X- m& @% X1 H- K
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patches-own& X) Z" ]3 }, u- X' F. ?
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intersection? ;; true if the patch is at the intersection of two roads: C% X; t2 I/ K9 y' r+ b5 Y' y* Y4 W
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
6 F8 E" l2 [/ w$ [9 Q/ N, A ;; false for a non-intersection patches.
1 K) i3 T8 l v, w% R7 ? I' J my-row ;; the row of the intersection counting from the upper left corner of the7 l) L! W$ a6 w: J
;; world. -1 for non-intersection patches.- a' n" W+ t/ D- M3 p
my-column ;; the column of the intersection counting from the upper left corner of the. h2 e% j" w Z% ]; d4 ?- k$ y
;; world. -1 for non-intersection patches.8 h: W+ e& o+ U( i7 c9 H0 a
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: K7 w& T J I* ^5 r auto? ;; whether or not this intersection will switch automatically.7 A7 R$ A& X( x0 W) `
;; false for non-intersection patches.
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6 q0 _4 S \4 @" a( Y. v/ K;;;;;;;;;;;;;;;;;;;;;;
' t( }3 }( N( x$ |4 ^1 Q;; Setup Procedures ;;# W! S0 u: @5 y# f4 p( G7 [
;;;;;;;;;;;;;;;;;;;;;;' M2 b" S# l9 u" Y- Z
3 N C0 j2 Z4 i# V+ \+ g;; Initialize the display by giving the global and patch variables initial values.
/ g1 E: R; Q( h: r;; Create num-cars of turtles if there are enough road patches for one turtle to
2 ? u' r7 C# L4 L8 I; N! O;; be created per road patch. Set up the plots.$ C8 _3 N2 w% }: ?0 f
to setup
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setup-globals* n! |, u- K' b
- a: Q1 s. c% s; N0 a: u, Y f ;; First we ask the patches to draw themselves and set up a few variables
- I4 M( p3 H7 j: @3 z8 c setup-patches" Z' ^6 L. j" U$ S! j# f$ k/ X
make-current one-of intersections' T; W9 @- P% q- S% B
label-current
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set-default-shape turtles "car"
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9 B# i7 O& U! N# \; [& @/ A6 i9 N# Y if (num-cars > count roads)- W( ?/ p" a% u; j) j
[
5 ~5 t$ ^, {) q user-message (word "There are too many cars for the amount of "
0 E& s0 P6 V( a2 ] "road. Either increase the amount of roads "; Q& z9 ~2 k& U
"by increasing the GRID-SIZE-X or "& N2 w2 J. F" ~# ^. H6 v: A
"GRID-SIZE-Y sliders, or decrease the "( l) K) `3 Y, R% q2 g, y
"number of cars by lowering the NUMBER slider.\n"
, y% J9 `8 A* _2 o x5 P% A "The setup has stopped.")2 f* |% h3 a E" [7 x# S1 X# \
stop( j( k& j( |: b. b+ w: O
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color @% q5 s; R) g
crt num-cars
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7 l/ C5 n7 Z6 b U0 _3 K setup-cars
7 G5 R% m# ^+ G. A) g4 J set-car-color
: m3 z1 n* ^6 w4 T* T- u3 Y record-data
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;; give the turtles an initial speed
W5 v& r# s+ z- @5 {' K8 d ask turtles [ set-car-speed ]) i" N& [. S8 q# k, i
" ]# i7 V0 g8 N2 c reset-ticks
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5 s8 W3 ^/ x1 E% O, D& k4 H8 K;; Initialize the global variables to appropriate values
4 ], n1 l8 q, v4 [to setup-globals
% O4 `! X$ j0 A1 D% Y& z6 N5 c, v set current-light nobody ;; just for now, since there are no lights yet
- Q w; P# D0 p. g) p; L% u set phase 06 ?% l# {2 J% N; ?' u' B; v
set num-cars-stopped 03 N) j+ b" ?! x/ s& c
set grid-x-inc world-width / grid-size-x6 [! f" N3 b7 c3 _+ G, k$ j. ~
set grid-y-inc world-height / grid-size-y+ t& q5 x6 ~0 {8 h7 r3 e
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. t% R `& _" x# N
set acceleration 0.099
* e" \$ J/ H3 Z$ P7 N5 L; bend
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$ R9 S- l! U8 u6 S1 @+ o;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 E( _7 ~6 E. l3 u" ]! a1 T) j;; and initialize the traffic lights to one setting
- r0 a6 ?0 l( ^7 R/ J, Y8 R) u# Nto setup-patches/ d) A+ }& `5 q: Q
;; initialize the patch-owned variables and color the patches to a base-color
) a* q3 t7 ?. r3 j9 X5 q0 O- T ask patches! a; `$ [( ?) x3 s% D
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set intersection? false) {4 V, ^6 g* y! }
set auto? false& p7 o2 u" a4 Q7 ~
set green-light-up? true
; [ R* v" c1 V6 t6 }! t. P" h5 R: \2 t set my-row -1
4 P2 R' a% a r% X, t/ { set my-column -10 H7 M9 O' C' P) D. @7 X
set my-phase -1' O' @( X2 d W( \, j
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
. H5 i1 P; q7 {9 b6 q; r set roads patches with! q' I% D b+ v: Q# x- |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& P% q+ O1 @: Q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 N5 ^3 ?& ?4 F8 |" A+ h" c9 Y0 f
set intersections roads with" ~; Y6 u5 O# ~ ]) M1 f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; l: e, W: R) n( j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ y$ D' |3 b) n& N2 X) ^
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ask roads [ set pcolor white ]5 ]+ X' T% s# m' X
setup-intersections
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6 ~4 x0 B- J; _* i" f其中定义道路的句子,如下所示,是什么意思啊?
/ H- i3 F+ a; B. }6 i) } set roads patches with e9 d/ Y7 A2 d, R8 z. J% i5 @/ w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% b, [3 C& Y! O$ G3 g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 H0 t. e. V5 `% j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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