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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 g6 Z2 x4 j: t) M- vnetlogo自带的social science--traffic grid这一例子当中,
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[
: c" `) `( [6 k4 w. I grid-x-inc ;; the amount of patches in between two roads in the x direction# [9 F$ n) Q/ r' w) \
grid-y-inc ;; the amount of patches in between two roads in the y direction4 C6 Y/ |% U( t" B: f" p# Z( N
acceleration ;; the constant that controls how much a car speeds up or slows down by if
. \" z( b3 e' m3 ~7 O! o0 N. N% D ;; it is to accelerate or decelerate. a3 @& C5 v3 N$ o
phase ;; keeps track of the phase
7 m7 [% X; C W- } num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
# a6 s Y( D1 n current-light ;; the currently selected light
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F, k t: b; J2 K2 W! Q1 t+ g ;; patch agentsets: [) h& r& j3 X- l/ F1 W5 Q& V0 B
intersections ;; agentset containing the patches that are intersections% f; Q+ {, j+ a! W0 {4 m1 a" s
roads ;; agentset containing the patches that are roads
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turtles-own+ ]% t) W1 D( `" f
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speed ;; the speed of the turtle
" h$ k- _9 K: R$ } up-car? ;; true if the turtle moves downwards and false if it moves to the right- P) ^8 [* x) u# d% I& r: z8 u1 ?4 ^/ q
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads8 U# d! [* F2 {& w% {- T! t. q
green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 C2 q0 z; O1 B8 o2 c1 T! m! S) P1 H
;; false for a non-intersection patches., I Z3 A+ i8 }; A$ F: Q7 V
my-row ;; the row of the intersection counting from the upper left corner of the
6 E$ g* b: y1 Q3 P2 i* Q) } ;; world. -1 for non-intersection patches.
# L( q; R) @! l% E0 R my-column ;; the column of the intersection counting from the upper left corner of the
* f. N& f2 i1 V8 y ;; world. -1 for non-intersection patches.
, v* ]8 e2 V. ` my-phase ;; the phase for the intersection. -1 for non-intersection patches.( h( ?0 W# U3 |9 z6 J% I4 a
auto? ;; whether or not this intersection will switch automatically.4 y' y0 u9 ?# }: r
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
C+ K0 `) Q& F) b- N;; Setup Procedures ;;
$ n( v/ C5 E0 M% x;;;;;;;;;;;;;;;;;;;;;;6 k. `* y4 X: G7 h
# w5 D. n0 p* z8 Z* @& S6 _;; Initialize the display by giving the global and patch variables initial values.
& {* R8 _1 a* L6 Y+ C;; Create num-cars of turtles if there are enough road patches for one turtle to
1 I; [6 x( @7 W) `' |" {;; be created per road patch. Set up the plots.9 I" H/ ~8 |) P8 b
to setup
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setup-globals
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' ]8 [, S3 V8 h9 E( o' j7 R; S4 N ;; First we ask the patches to draw themselves and set up a few variables
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make-current one-of intersections
) Z9 N) a" k7 S- [* B( c( m4 \ label-current9 x- F8 N: Y: w: ~5 S" G
- Y4 t5 S2 J$ J0 K! _6 ? set-default-shape turtles "car"; u' Q) t! r. K" ^$ K0 N" [
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if (num-cars > count roads)
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9 R, O+ ~& Q0 G' H, P a user-message (word "There are too many cars for the amount of "4 R" J) z1 H- _; n; Q+ P3 e
"road. Either increase the amount of roads "
6 G. n, q5 V! ?* | y7 L "by increasing the GRID-SIZE-X or "
/ E( o8 p% K" W3 n; o# C4 l "GRID-SIZE-Y sliders, or decrease the ") u9 h: z* ~1 ` |1 e
"number of cars by lowering the NUMBER slider.\n"! w' m, y& o4 y0 M4 A. V8 ~
"The setup has stopped.")
b% e" q7 d: _( W4 ^ stop
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- e- t- G1 N5 i' `0 S ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: a. _# u4 h9 M A crt num-cars
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set-car-color
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]
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" r1 D1 t. }$ x7 f1 X, u ;; give the turtles an initial speed9 O/ h6 }- g9 `7 V! J& w' d
ask turtles [ set-car-speed ]* I7 s7 C. B: s. ~' N% V7 _
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reset-ticks
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# g4 |/ g4 e% V7 w, l% E;; Initialize the global variables to appropriate values/ p2 r& Y2 Q# q# H
to setup-globals, F+ ?0 j' ~/ i2 E
set current-light nobody ;; just for now, since there are no lights yet
; i; X- U( I; S5 b* y8 O8 ] set phase 0
4 K* O9 b. N* K& K+ t set num-cars-stopped 0
; w; S0 O* G7 i9 H/ G! \6 e5 P# ` set grid-x-inc world-width / grid-size-x; H- w" b+ e4 p8 U
set grid-y-inc world-height / grid-size-y
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! K: K; N3 a! D/ e7 ?6 R" Q ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary* _+ I: g8 \0 e2 X: w. J+ s2 v/ n! C
set acceleration 0.0992 q1 r+ v( z8 D6 Q
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 q2 G, d Q- Y# w# `9 H- ~
;; and initialize the traffic lights to one setting7 |4 z% c2 `/ T0 @
to setup-patches+ _' s5 J. h1 ]& d1 H
;; initialize the patch-owned variables and color the patches to a base-color
- C/ b- F; w/ P9 p% i- s- {- g: | ask patches
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7 Q. S0 N7 n5 m! { set intersection? false
3 s# o1 B2 V0 \ set auto? false
9 x4 C( k: G0 U( b1 A set green-light-up? true
' o" p A, K6 k+ K- `, { set my-row -1
2 I% o% c, r. ^3 g* A! v# } set my-column -11 U5 t1 m# [5 [ {: F; V
set my-phase -1
0 J& C1 d/ r3 e; `! [ set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets3 F' {( j% K% e& l
set roads patches with
% x3 M/ f, B* q0 d3 r2 l7 S& E! H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 f5 a: R% K- h
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( d: c: m8 N, `% }9 x( Q6 ?
set intersections roads with
# @( b6 W. ?0 L- Q* N8 Z( ^: j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 q( R! V; f: z% F; R- L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ] B1 k. i: ]3 v9 q P* Q8 M- |( O
setup-intersections% H5 |9 \. m% \8 ]: u
end4 ^+ x+ ]& k4 A9 U, `8 u
其中定义道路的句子,如下所示,是什么意思啊?
, Q. }0 l/ c; x# L set roads patches with
. _' V0 k- a3 C' n8 Q' c( j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) G, h: n1 U# v8 K" L. H* i
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: O: P" f6 B! ^( b6 F+ l7 r, F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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