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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 z( A) d/ W5 Enetlogo自带的social science--traffic grid这一例子当中,
9 K, F( u8 s9 j: Aglobals6 t( k3 G% z! h; v+ G0 T, d( f
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% h( l! t8 h4 v* d# H; ` y9 M grid-x-inc ;; the amount of patches in between two roads in the x direction3 d8 D, X2 Y/ P/ h9 N
grid-y-inc ;; the amount of patches in between two roads in the y direction! f. x) s6 R5 w5 I' k5 R
acceleration ;; the constant that controls how much a car speeds up or slows down by if0 E: J* ?' O. m9 v* \
;; it is to accelerate or decelerate: g+ b" y J l$ p1 Q
phase ;; keeps track of the phase- Z2 x% a) }& Q5 {
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure/ i+ T! q0 N! u" v
current-light ;; the currently selected light
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;; patch agentsets
5 ?( [' [6 E2 y$ a3 d+ X intersections ;; agentset containing the patches that are intersections
& j2 w, r/ C) [ roads ;; agentset containing the patches that are roads: S- i; H+ Z2 |! N6 K
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turtles-own3 Q% @: q3 Z, S* T4 u9 M
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speed ;; the speed of the turtle
& z" j" B0 F- {7 B up-car? ;; true if the turtle moves downwards and false if it moves to the right
; z* b& [( G/ Q$ c 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 roads0 F8 I' K- u% B0 d/ B7 T) j
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
/ l+ X& L! X! C# M/ M# \( \, Z ;; false for a non-intersection patches.$ u6 D3 C# B2 L
my-row ;; the row of the intersection counting from the upper left corner of the
1 u: E Q9 k* y8 ^: A: w) v; X ;; world. -1 for non-intersection patches. c4 t" i# \: G: y/ t; a
my-column ;; the column of the intersection counting from the upper left corner of the: `8 b% c* z8 X9 Q! i! g) y
;; world. -1 for non-intersection patches.. W8 Z9 W: I: P# A
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 f- n9 R! B; q auto? ;; whether or not this intersection will switch automatically.8 a+ K9 | T! s# s2 N, b
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
' o) M1 z5 a* ~ R9 t, U2 n;; Setup Procedures ;;
0 _) Q U. b8 b( }+ x9 _* q/ G;;;;;;;;;;;;;;;;;;;;;;
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# ]; M; z( p9 |% J) l- X;; Initialize the display by giving the global and patch variables initial values./ J+ A- V8 n P# e3 ]! m) f
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 H% m0 O7 R' @. ~1 M;; be created per road patch. Set up the plots.- O7 [% M2 Z6 _# e$ |, l
to setup
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; v% a3 W3 Y2 N0 _4 M! s0 b setup-globals6 P `2 P% T4 z1 D8 @4 z. x
( |; d4 s7 O! |, B- \ ;; First we ask the patches to draw themselves and set up a few variables
9 X6 F7 S" J+ l6 l, \ setup-patches% ^% I( t/ C P% E" I
make-current one-of intersections+ B6 t8 R% l" D& ~
label-current
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set-default-shape turtles "car"' S: b7 f4 s, W b- ~' X) L
0 f+ H7 i2 w: z0 _# E! u if (num-cars > count roads)
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7 M; a# E# W+ j2 W0 v9 u8 D user-message (word "There are too many cars for the amount of "
( ~/ |# Q( l! u6 H9 i, c% ~ "road. Either increase the amount of roads "
; ~ k5 z+ I9 z. c/ z3 H "by increasing the GRID-SIZE-X or "- C5 ?9 v. Y3 o2 [9 ]$ f$ H3 j2 R
"GRID-SIZE-Y sliders, or decrease the "( r0 M' H: I$ P3 Y0 q
"number of cars by lowering the NUMBER slider.\n"6 ?/ q; R! Z! y! p
"The setup has stopped."), G2 `, o6 N+ |& G6 A! h* F. p
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color, K: m2 U; h4 { C
crt num-cars
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; T2 | K$ F: M | setup-cars
- m. s5 z5 C7 F set-car-color. B& s. q+ B0 n* s* n* P
record-data
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;; give the turtles an initial speed
; T0 ]3 U/ a8 k/ b ask turtles [ set-car-speed ]+ {6 i8 N# B# K- A$ ]0 |
+ O" }; x$ t, t reset-ticks
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
& g. V( U- U" g* V( q# S set phase 00 j) n) d6 _( [- x
set num-cars-stopped 0
6 e+ F, {7 ~0 [9 Y set grid-x-inc world-width / grid-size-x
' \- b3 `% T. H' G& h set grid-y-inc world-height / grid-size-y! p5 B- s$ W- p
7 r( K9 t2 F$ d& \; b) @6 I% V ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
" j$ \: ^0 r+ l set acceleration 0.099. l/ P2 m, k3 k2 y
end
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3 I! `7 y" l1 V. Z# H;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) o+ e; e. v6 y+ r2 F
;; and initialize the traffic lights to one setting+ g$ Z/ s. m/ r. x! o/ a) z- S
to setup-patches
% k* D! C! k$ r ;; initialize the patch-owned variables and color the patches to a base-color
$ @9 M- S3 o$ [% [2 R0 j5 Q, X# Z! U ask patches
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set intersection? false
, N# x# J: u* E I set auto? false
5 [# Y( D3 x3 B8 z' P. i# \ set green-light-up? true
8 P" b+ D# R6 T+ K) D7 S: P, R set my-row -1
' \6 \+ T) Y% P& e7 e set my-column -1
% g. c: J- \; P+ R) V( B; q' k set my-phase -1
# `; y) s' j# G* l$ k- k7 V9 Z& B set pcolor brown + 38 g5 J* p7 s0 ?6 q) _
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, t4 V' b. F1 V ;; initialize the global variables that hold patch agentsets
* j8 j$ R0 N8 r- h set roads patches with
6 G7 m) O# {1 i* C* |0 R1 Q) i [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ O& j4 c) D* L: P7 B
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% Z; P+ ]8 S4 N: S, N) w- Y
set intersections roads with
) J6 J6 n" I; W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 k% U- H* L V( a
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 } o) }% I9 _$ _% S; g. ]" j" e
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ask roads [ set pcolor white ]
, [ G* l* k. G4 j4 ? setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?' X0 z: ?8 ?+ X0 T
set roads patches with9 U# p9 y8 p6 [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, \/ P i; ~+ Y6 v) f, c
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- R9 ^. M6 ?7 ?5 ^9 ~6 W* |0 [* W# @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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