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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。
9 H: v8 o( ~/ I. Q4 vnetlogo自带的social science--traffic grid这一例子当中,
( [* `+ T9 x6 \. S$ zglobals/ n" y1 P3 w, C" [4 L9 _
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grid-x-inc ;; the amount of patches in between two roads in the x direction7 `* b2 n+ ]& i
grid-y-inc ;; the amount of patches in between two roads in the y direction
% w a w5 k1 Y" w4 R acceleration ;; the constant that controls how much a car speeds up or slows down by if. m3 \. V: Z6 K. h8 J2 z
;; it is to accelerate or decelerate4 i& f) t2 h/ S! R/ F) u
phase ;; keeps track of the phase2 O' @: F2 P" c2 }5 _' {( [; [$ k. E4 U
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
1 c) n S E2 h" E: W" {1 V current-light ;; the currently selected light
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;; patch agentsets
2 W7 S1 i0 d, z# |! A intersections ;; agentset containing the patches that are intersections* J; w0 x! J2 b3 O
roads ;; agentset containing the patches that are roads2 o2 m9 ]' b5 j3 z) M4 F4 q! q
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2 l( o# U: o; v Gturtles-own: g3 y' V2 g4 ]' x2 B" |
[
5 m1 C( X- x* d, o; f( e8 q speed ;; the speed of the turtle* y [% C5 `3 I) z/ S- c {
up-car? ;; true if the turtle moves downwards and false if it moves to the right
$ p* y; b0 ]$ t$ m wait-time ;; the amount of time since the last time a turtle has moved" ^3 x1 a# Y$ C% g7 L/ {% k3 F
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patches-own/ G9 n& ?6 Y q
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intersection? ;; true if the patch is at the intersection of two roads
3 |; s: G. a h, {# v green-light-up? ;; true if the green light is above the intersection. otherwise, false.6 N3 k: {; \ d, i9 A
;; false for a non-intersection patches.7 j3 z, u4 `# z# C W
my-row ;; the row of the intersection counting from the upper left corner of the
* t3 V" x7 U. b/ A$ ^ ;; world. -1 for non-intersection patches.1 R) F+ Y9 k5 j; O, \9 e- m3 B
my-column ;; the column of the intersection counting from the upper left corner of the& {8 }+ b$ r/ R) t! G
;; world. -1 for non-intersection patches.
7 j: c5 `1 y4 J7 j% @ my-phase ;; the phase for the intersection. -1 for non-intersection patches.+ [" e& u& U, [4 @3 Z+ ~+ A) g; K
auto? ;; whether or not this intersection will switch automatically.9 Y8 |( V( [! V: n" b) Y9 i( D0 L
;; false for non-intersection patches." W2 H4 T {! M% R
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;;;;;;;;;;;;;;;;;;;;;;( Z2 \/ }, a* n/ s2 _% z
;; Setup Procedures ;;
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1 B5 g- I i% ?- c9 ~;; Initialize the display by giving the global and patch variables initial values.3 H/ n# H1 P! G$ m X1 d
;; Create num-cars of turtles if there are enough road patches for one turtle to
- t9 {9 E2 A) u5 k; B! B;; be created per road patch. Set up the plots./ z( x7 u6 [$ s: F9 `' `9 }8 P
to setup' {! [$ w6 T1 [9 Y
ca
6 o1 a1 s3 C6 _0 O0 U. K setup-globals
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;; First we ask the patches to draw themselves and set up a few variables* }8 X6 M; H1 v7 S* X7 @0 u$ [) ]
setup-patches
/ J. W9 t! f5 b2 z* T make-current one-of intersections
9 n3 {" p0 e0 g% M+ T label-current4 e4 f1 C4 w6 o v$ ]3 j
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set-default-shape turtles "car"
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if (num-cars > count roads)
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3 v! m7 M, b' o2 Q& a7 S m$ n) q. C user-message (word "There are too many cars for the amount of "8 ~1 O y4 A# b
"road. Either increase the amount of roads "3 k9 u" U8 k! n5 _) f8 ~
"by increasing the GRID-SIZE-X or " i- L! |. e6 I* q7 E4 X
"GRID-SIZE-Y sliders, or decrease the "0 N) v/ `* z8 I2 O5 w9 Z3 T- p
"number of cars by lowering the NUMBER slider.\n"
$ r7 R7 t) }4 {* u/ C8 N9 ~- w1 R "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: v: z# T; v& \# [1 l3 J crt num-cars
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setup-cars" ]* n( E) O) Y& _7 v# w
set-car-color. c' L2 T6 _9 \0 Q& w
record-data
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;; give the turtles an initial speed: k' s; y* _1 }; g( J! m! M! c8 d
ask turtles [ set-car-speed ]
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reset-ticks- O; F7 ~6 b4 \, ^: T% X
end, X2 v! Q$ p/ E4 }
4 \# n. r' E* u$ b# C: O! V. o5 i;; Initialize the global variables to appropriate values0 r# [: l' U6 ~. J2 T! e
to setup-globals( h# R! q; p7 \8 L* m
set current-light nobody ;; just for now, since there are no lights yet
/ s& Q7 Q. ~! s0 |$ _4 j, I set phase 0
. N* z& _# s2 I( ?% r4 H set num-cars-stopped 0
A) {: n2 S( ^. l% o7 X set grid-x-inc world-width / grid-size-x. w' F* e( G2 ]2 G, s1 C3 W
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
! T# l4 v9 G/ _9 u* S, v set acceleration 0.099
: {0 }2 N) z. B0 T+ eend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 F C1 m: \3 {1 {: h' n;; and initialize the traffic lights to one setting
: F$ o I/ s& h9 f1 w) S; u- Ito setup-patches O! g$ `% f [
;; initialize the patch-owned variables and color the patches to a base-color
. n& f5 f. ?3 ?9 m ask patches% t9 o# }3 z0 ]( g) Y; O! A
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6 X1 u6 d- [9 P/ A set intersection? false
" I: Y: R+ ]0 B+ m+ G" P9 W set auto? false0 `/ c- q. Y# W% D
set green-light-up? true5 G8 K& z' S9 G/ E |. P1 u
set my-row -1
5 I1 J8 A9 o- N set my-column -1# _$ r4 L9 }& u, \
set my-phase -1
, S' ^6 M7 ?$ ^# w& c set pcolor brown + 3
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; Z; c$ ?/ k+ i/ D& u! ^ ;; initialize the global variables that hold patch agentsets' N" ~: |4 y) r5 K& F+ L
set roads patches with+ W% u. _, ]/ t8 X1 F' d
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# n- P) H) f$ h: _9 I (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 C0 X; j2 ^. i- n6 F
set intersections roads with
9 D t( `0 O: E. q+ P h. s, j: m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. s7 Q# W& ~) ]# x V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" B+ p* _- x/ F9 V, G
3 \2 Z7 l& m1 }, l ask roads [ set pcolor white ]
: p+ @6 A* O+ U3 t setup-intersections }5 ~# R8 v; |# Y3 g. u
end
3 g5 X6 ~8 l, `. [: X* m, S其中定义道路的句子,如下所示,是什么意思啊?' t5 O2 G( \0 t) }
set roads patches with9 C6 y D4 ?. B% x! S8 H4 P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ t# v7 q+ O' Q6 e+ G* K' k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
d( t/ C$ O g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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