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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。
3 k, `+ H: [7 i& @1 u3 ~netlogo自带的social science--traffic grid这一例子当中,4 D+ |* b1 M, ^# y1 L
globals
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. r4 _7 r [8 s0 D% G grid-x-inc ;; the amount of patches in between two roads in the x direction
+ A3 T$ ~( D4 M: _: \( ] grid-y-inc ;; the amount of patches in between two roads in the y direction
. [. E. a; o8 s7 {- Q acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 I# t3 s" Q5 a ;; it is to accelerate or decelerate9 ^/ R; _7 D/ C! _3 Q% | Z
phase ;; keeps track of the phase) G4 d4 M0 `+ s
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure' j u, @0 H$ S' l3 s7 z
current-light ;; the currently selected light- P4 a4 P& |( J, J/ k$ s4 H
- J( N5 q$ m) V% V S# e) o ;; patch agentsets! G9 A6 O/ M1 U
intersections ;; agentset containing the patches that are intersections
F9 A" h& Z2 \6 u# s, e8 T roads ;; agentset containing the patches that are roads
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* f* ?1 B+ N6 E1 g% E, R+ r$ oturtles-own
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speed ;; the speed of the turtle. h& k% _% F' }' x- C
up-car? ;; true if the turtle moves downwards and false if it moves to the right) ~4 O/ ]% e4 E3 o( ^; i( K& t
wait-time ;; the amount of time since the last time a turtle has moved" `5 T/ x& Q: }
]
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4 t0 V# n# z7 {$ jpatches-own4 v2 p& N1 `6 N- _
[
. ]6 U. c/ ^4 \1 v% r/ }* S intersection? ;; true if the patch is at the intersection of two roads
) b" |8 P! X1 T+ m) H6 [9 f green-light-up? ;; true if the green light is above the intersection. otherwise, false.3 b- }" ?: l" Q: @" }. q" W D
;; false for a non-intersection patches.( ^" ~7 @/ x5 w$ v( s' ?3 m9 S
my-row ;; the row of the intersection counting from the upper left corner of the8 i; Q3 V- I5 p, y( o* Z0 T
;; world. -1 for non-intersection patches.
$ v0 q; q- Y* _5 E3 M% Z my-column ;; the column of the intersection counting from the upper left corner of the
/ |7 ^. }- ]0 w" _. h+ t3 z) g ;; world. -1 for non-intersection patches.9 `- m4 j; ^4 U
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: n4 C( l" N$ k; n. s5 P auto? ;; whether or not this intersection will switch automatically.
; V" G" {( G5 D8 |3 ? ;; false for non-intersection patches.
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/ N# H; ]6 }: p4 d" t$ x% Q( r" `;;;;;;;;;;;;;;;;;;;;;;* B3 n$ I5 l( h2 L! Q) X5 Y. p2 z7 H
;; Setup Procedures ;;# m. V/ S1 g) @. f6 N( ^" F2 h" q
;;;;;;;;;;;;;;;;;;;;;;5 z7 c1 N& n: W& s" d8 Y9 F
$ ]4 T, _' o5 s& z! ];; Initialize the display by giving the global and patch variables initial values.
% j1 I0 `! D6 E7 | F. B( P( v;; Create num-cars of turtles if there are enough road patches for one turtle to
- I- ?* X3 H! S9 s;; be created per road patch. Set up the plots.
, }$ \; N6 W; i" \to setup/ k9 I% ^5 U- |9 S+ M3 Q5 e- r
ca
6 Y6 f m+ z, c) U8 }4 \/ i setup-globals
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;; First we ask the patches to draw themselves and set up a few variables5 [7 W+ m* B* y$ t$ h+ O! K
setup-patches5 L9 [" n$ j4 v, i* s7 t
make-current one-of intersections3 w' |" I4 r! w$ @
label-current
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set-default-shape turtles "car"
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' m; B: [: `! {- U3 H: n5 y0 a if (num-cars > count roads); i! R$ s# ~, K
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% {0 f: n/ j: n8 D$ r user-message (word "There are too many cars for the amount of "* x0 Q" z' S/ D; d, W5 D
"road. Either increase the amount of roads "
* C4 F. c: j4 J "by increasing the GRID-SIZE-X or "% j- m" H, I6 W8 w! o6 g
"GRID-SIZE-Y sliders, or decrease the "
2 d: v" e4 k3 x0 [ "number of cars by lowering the NUMBER slider.\n"$ c0 }0 b5 T/ m& c6 I4 H- Y) C. ?
"The setup has stopped.")
. E4 A% V5 V' W7 g- d! {, b" L stop
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* P- s# m G2 u ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color0 C5 ?" R1 C, K: O% w
crt num-cars/ ^3 X6 x- D+ m6 n+ z, r9 J( V0 }
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setup-cars
. r2 Q0 \% r5 }2 ?* x" Y set-car-color* o7 W( Y! C7 g
record-data
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;; give the turtles an initial speed
u& [8 j: F- o: D, Z ask turtles [ set-car-speed ]
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! ]; C' @6 B H2 P reset-ticks
& Q" q# C) y u5 ~8 m+ eend
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- z, ~: Z# e1 D# i+ b6 }6 g;; Initialize the global variables to appropriate values$ a* Z7 \2 W. |
to setup-globals' X8 Z; k. _* ?
set current-light nobody ;; just for now, since there are no lights yet# C& `1 K; A$ R9 [# H
set phase 0
" P2 r& K/ Q6 C3 w' b5 J set num-cars-stopped 0- S$ _" a* B9 N& T P
set grid-x-inc world-width / grid-size-x. M& R: k( G. ?$ `1 [% Y1 F0 i# N4 ?& w
set grid-y-inc world-height / grid-size-y
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" C0 @4 t+ O' d" T( X4 w ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
1 B- T1 T, {. P. C1 J set acceleration 0.099
, s r8 R3 N9 M! wend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 a; i- j# ?; q9 e M
;; and initialize the traffic lights to one setting! w3 }* B9 ^/ p6 | |5 u0 D" ^2 } ?
to setup-patches) w2 t7 i7 t) o; _
;; initialize the patch-owned variables and color the patches to a base-color
; D5 R3 L' @% V/ i% c* | ask patches
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, R: K. `0 O& E2 x set intersection? false
) C7 ]( q4 V3 t6 T set auto? false9 C$ z$ @( x+ ?! S4 W6 q8 L
set green-light-up? true
k, V/ G7 X2 ]+ w2 T- c" ~6 \ set my-row -1$ {# n: k; k; |% T
set my-column -1; p/ N( p2 I! U; N7 p6 g* e
set my-phase -1
. k- \& Y9 K+ X( T set pcolor brown + 3
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9 C x, F; y) n# _ ;; initialize the global variables that hold patch agentsets: Y2 P! ~7 b1 x9 z9 \' M
set roads patches with9 B3 Y* o' J% \8 b8 D6 s$ I; X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 W( L. e) p1 w+ ?4 R1 X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! q- N( f R/ i; x set intersections roads with
7 Q" [+ n( p. J1 Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, I5 z6 f1 Q0 s0 [0 T' s- q) x4 E
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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1 F. [; H6 f8 {, N& ~/ r ask roads [ set pcolor white ]
; ]! y4 g% e7 b8 Q7 ^2 @$ `, J0 ~" Y+ a setup-intersections6 v; c. J0 E4 W- l9 J- z1 V
end
, _2 v4 ?6 D8 H) f1 J, c其中定义道路的句子,如下所示,是什么意思啊?3 \" Y( H$ \7 G9 Y8 Y
set roads patches with
8 _/ s% c, p9 F( w$ I [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, V7 A+ j, f* F; `& F: G! Z0 w9 w
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 n) e( W4 b8 {+ i7 u
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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