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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。
Z$ b Z& n3 I0 M" D6 X v4 Snetlogo自带的social science--traffic grid这一例子当中,% F' m; \2 ]2 c/ Y- w g
globals3 j# _( \' ^ z; k/ m: _5 {
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grid-x-inc ;; the amount of patches in between two roads in the x direction& A$ Y3 S( U/ U" T/ t" t
grid-y-inc ;; the amount of patches in between two roads in the y direction0 u0 o+ k, H) ~
acceleration ;; the constant that controls how much a car speeds up or slows down by if$ E( L& m% Y4 x& W( g
;; it is to accelerate or decelerate8 L2 Q1 g/ x& ~# ?2 Q
phase ;; keeps track of the phase
1 t% D* b! R2 b- W0 ] num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure9 @+ D! V# Q, N; {
current-light ;; the currently selected light
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7 Z! t1 Y. W* h7 w1 }2 n ;; patch agentsets
$ Y( g3 ^0 [9 b$ @. |* N. L$ I6 D intersections ;; agentset containing the patches that are intersections& g, v. K! \' S1 ]
roads ;; agentset containing the patches that are roads/ C- x# I* Z: F/ Z0 ~; r
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turtles-own5 Q* u: N4 Z% W% x4 {
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speed ;; the speed of the turtle
1 I6 ^! ?5 d' t8 ]8 ?+ R9 t up-car? ;; true if the turtle moves downwards and false if it moves to the right. m. p& k* s* `/ ]) k
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 roads J) _: q9 _* y; e2 \
green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 _" I8 q; Z: E I
;; false for a non-intersection patches.3 G0 I2 U9 C; s( a
my-row ;; the row of the intersection counting from the upper left corner of the) z$ o$ b3 {$ {: r8 C
;; world. -1 for non-intersection patches.. I1 P8 M, e( q8 B4 l, T
my-column ;; the column of the intersection counting from the upper left corner of the' l8 y' M6 a9 u6 r
;; world. -1 for non-intersection patches.0 E8 M2 x$ m) N7 p7 f$ ?7 \5 `4 t7 {
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! l. a- b) T" k* ]9 s" C I auto? ;; whether or not this intersection will switch automatically.
# I% o' j4 e! M3 j3 m ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;) N% M( a* r% x+ {6 n
;; Setup Procedures ;;! d9 }' S9 J2 t6 \
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;; Initialize the display by giving the global and patch variables initial values.
. u8 E) \/ c- d- \6 X+ W2 {$ ]5 a+ o;; Create num-cars of turtles if there are enough road patches for one turtle to
& d* X8 Y% e4 n* d/ L1 L, F;; be created per road patch. Set up the plots.
$ o. t$ U, v5 c* }! F: Gto setup' k, v1 c8 y3 |7 z
ca
) t9 c+ \. N& j9 P! M% E setup-globals
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;; First we ask the patches to draw themselves and set up a few variables1 o' O1 x% O7 b7 T6 V( V: T
setup-patches
* n& |# K, A, i make-current one-of intersections3 o G/ P" o+ s7 @) c
label-current
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set-default-shape turtles "car"
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7 m3 N" U* w! ?8 d# C w% @ if (num-cars > count roads) ]0 s% V: r) R9 B9 c
[
, b! Q& x; w" W G user-message (word "There are too many cars for the amount of "
# G. P2 k7 F$ b# U( s7 L; { "road. Either increase the amount of roads "
! V! M7 B! j6 C" N) _1 a0 y "by increasing the GRID-SIZE-X or "
% t0 X; p( N1 B4 [, i "GRID-SIZE-Y sliders, or decrease the "
7 N* i; H; U& Z- u0 v/ ? "number of cars by lowering the NUMBER slider.\n"
4 x& w$ h4 G W# \8 Q; | "The setup has stopped.")
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, t! j: e3 h. A) m ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
Z2 x9 I/ f5 d" M5 B$ H$ D crt num-cars
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! p1 C# X o& ^# E3 ^" Q+ b setup-cars
& M- k5 n1 i! M, ~/ S5 e* {. u set-car-color1 @ t7 p G1 O
record-data8 B9 R1 {( g: x# i. f
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+ T. i& |$ M6 r0 f ;; give the turtles an initial speed
3 \: r' A% e! b ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values: l" [% I- ~( H9 M' s0 f
to setup-globals
9 O: h4 U$ R) _% {, r8 v. Z set current-light nobody ;; just for now, since there are no lights yet# Z1 d8 x8 w' X% }. a: c
set phase 0 Y; h7 M3 G) G0 r E8 N- G! M0 u
set num-cars-stopped 06 V, c. C) X3 _
set grid-x-inc world-width / grid-size-x" s' ~. U5 L5 ?" E/ z+ U1 G
set grid-y-inc world-height / grid-size-y
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m& `9 t0 D$ x ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" h4 e( n- n! c2 D, K8 d
set acceleration 0.099( ]/ e) {: t) Q- C5 @8 w- d- [
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 g/ t j2 m: Y7 x/ i+ A! R
;; and initialize the traffic lights to one setting7 _8 O& K1 _, y+ J
to setup-patches
5 h: v3 V: d3 q ;; initialize the patch-owned variables and color the patches to a base-color l& H, u+ [4 f) l4 @
ask patches
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6 r( j0 O4 d, z y; G set intersection? false
8 A7 f9 W p0 V( M( { set auto? false4 Z; }* F$ c/ Y$ H2 Q7 ]
set green-light-up? true
* E( n' i2 M! |9 j8 v set my-row -1" E' Z9 u% J8 c. e
set my-column -12 j: o! k* c5 a( D- j/ t
set my-phase -1# f4 w" {* ^3 I/ P4 f) q$ Y4 i
set pcolor brown + 3
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8 h$ v. n0 j5 U7 A2 b8 _, g4 n ;; initialize the global variables that hold patch agentsets
2 ^0 z/ }4 O! r. R% W$ S set roads patches with+ L% C- n; W2 Z3 B6 e: {3 G Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 }0 q% N* X; c8 d6 o8 n (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 j# E. `& i8 O6 o set intersections roads with
# ?, H' {! {! r5 O [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ K; ?! w7 {) J( V* p2 D) R: ~, U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ], i1 ^& k9 g) x% \- c' i- L
setup-intersections
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6 K9 y3 H0 D, U/ |其中定义道路的句子,如下所示,是什么意思啊?
0 [' H8 }" J7 a4 T% _; P$ @ set roads patches with
2 x7 a7 v, `( d) y6 U" ] [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, y8 l( {* {3 p2 T+ o/ J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( z; `9 ]4 p' ^3 x' N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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