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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。& L: p! Q; Y2 ?1 i
netlogo自带的social science--traffic grid这一例子当中,
4 I0 I Z+ f, C: Dglobals( p5 J8 M5 D" q; R# Z5 i( a
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( T, [4 L4 E0 N6 |, c6 F grid-x-inc ;; the amount of patches in between two roads in the x direction* t) j. d* z/ H) T4 p; H
grid-y-inc ;; the amount of patches in between two roads in the y direction
3 \/ _& L0 ~, J" I acceleration ;; the constant that controls how much a car speeds up or slows down by if
/ f ^" ?+ e& q* d- \ ;; it is to accelerate or decelerate
$ u3 F( w1 J; K, p phase ;; keeps track of the phase
! W0 v U& S$ w V! t# J num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
& c; L4 ?( k# w6 f7 @ current-light ;; the currently selected light
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" u* q9 c0 ?" s- \; J# g8 h7 S ;; patch agentsets- n& w3 p) C, T7 K
intersections ;; agentset containing the patches that are intersections- a, d8 o |% U6 y7 Y- Y Z
roads ;; agentset containing the patches that are roads; r& b+ ^6 l5 ~) \
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/ l$ Q3 A3 O8 c1 ^& \turtles-own: O! b2 e; q0 b( `: S) n% c- K6 F& K
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speed ;; the speed of the turtle( S Q6 r; e. E& h, a& @
up-car? ;; true if the turtle moves downwards and false if it moves to the right
( C0 Z2 U2 e+ |+ d% i4 t- O; f wait-time ;; the amount of time since the last time a turtle has moved' k% w9 w' R# j
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patches-own% Y* O3 @- \2 L" ?+ Q
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intersection? ;; true if the patch is at the intersection of two roads
# h6 r8 D7 A& z0 h+ d: L8 ] green-light-up? ;; true if the green light is above the intersection. otherwise, false.# d3 c1 {" r1 q% F. N5 I
;; false for a non-intersection patches.2 y% H* V* u9 i3 A
my-row ;; the row of the intersection counting from the upper left corner of the
# w+ G, [2 i- s9 r2 ^$ M0 J: _ ;; world. -1 for non-intersection patches.5 A. c% J+ E1 i3 T
my-column ;; the column of the intersection counting from the upper left corner of the
. x8 l" \0 @: }' [2 s# X! ` ;; world. -1 for non-intersection patches.; \$ c# h, @7 U3 d+ g
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
; P z# U7 W# g2 N& M% J auto? ;; whether or not this intersection will switch automatically.
+ |5 |$ X! O2 x: ~+ ` ;; false for non-intersection patches.. P2 w) p0 g* [8 v1 {& T
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;;;;;;;;;;;;;;;;;;;;;;
7 z0 k$ ]2 h/ p0 l3 F3 C7 f* T0 d;; Setup Procedures ;;6 q5 v* ?4 i, ~' X7 B8 i$ r2 C& }
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
% ~% Y/ I+ O( t) U; l;; Create num-cars of turtles if there are enough road patches for one turtle to
1 `7 B9 Y7 j; G9 P+ l5 |;; be created per road patch. Set up the plots.
{1 U, \/ z# z/ O. X! sto setup
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setup-globals' w; p; v" z# Z/ v% O) l0 N% b3 f
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;; First we ask the patches to draw themselves and set up a few variables1 \+ _- M& E4 _5 P* g' A' C9 S
setup-patches! [ [9 Q O/ a) t7 x8 `% @. O
make-current one-of intersections. L1 p6 @0 A8 T2 H% ^
label-current
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set-default-shape turtles "car"
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j1 a* C4 {2 ?: h% J2 ? if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
3 q, g: w( _8 I" u "road. Either increase the amount of roads "- p6 T! A: L' S8 p
"by increasing the GRID-SIZE-X or "
0 d' t4 a6 _4 v& z& z! |, R "GRID-SIZE-Y sliders, or decrease the "( e4 U7 B! ^2 v' d0 K
"number of cars by lowering the NUMBER slider.\n". b4 n: t0 v5 p# V% c' N/ w
"The setup has stopped.")
1 L5 y# x! l Z# Y, t, d$ w4 M* ^ stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, }1 |) u+ X. i% y crt num-cars
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# @. K1 \' q4 T) G# b) R& Q5 T6 C setup-cars2 Y' B' Y. a0 A' L8 r
set-car-color
; R& |* [8 ^# t record-data
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;; give the turtles an initial speed
) W m2 n+ A# N; E" ?5 _ ask turtles [ set-car-speed ]8 J+ @) T8 y. O$ l6 L1 n
% S2 K# ]# P# b( r1 G reset-ticks2 |2 p- H3 W; `* }
end
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! R! x7 n* O% D& N;; Initialize the global variables to appropriate values
, D J2 A7 s5 d6 T! o, ato setup-globals3 b; U P- [9 @' a# a
set current-light nobody ;; just for now, since there are no lights yet
" b5 R8 y* L% \2 ~8 K set phase 0" g+ z, j% [0 |" n
set num-cars-stopped 0
$ k9 M3 X8 T" Q set grid-x-inc world-width / grid-size-x/ `" {2 W( G4 p+ Y o: l. c
set grid-y-inc world-height / grid-size-y4 i& a. |" i* K$ \, i0 Y; T5 }
' J- P% ]3 d4 V( D ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) \$ j: r7 y( |+ [
set acceleration 0.099' n1 s2 s0 N2 n# b1 d; O, B% W7 W
end
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! M2 |9 g8 i2 P; O1 r. c5 T. T;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, p2 x5 K4 F$ C/ q4 y4 I;; and initialize the traffic lights to one setting
# H; { x# D/ _9 [to setup-patches
; D3 w- E8 m6 ?+ |0 R ;; initialize the patch-owned variables and color the patches to a base-color
9 b2 f C4 M3 D ask patches* i% N' E( ~$ K) F/ v0 t- i0 i% F y
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set intersection? false; Y* B. I ?3 u* _! ~2 Y
set auto? false
0 |' l; q- P+ V: ` set green-light-up? true
" G( G3 G- O5 Y. @5 O set my-row -1- S* N1 m5 z% g$ {2 S, a
set my-column -1, `2 D) `: C& I# S
set my-phase -1/ ~+ Z& L& R6 M a; g) {. k
set pcolor brown + 3- {3 c+ S5 y8 V2 Z w* D
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;; initialize the global variables that hold patch agentsets
2 m* ^) C$ r3 C set roads patches with
: x. R3 R9 X' s; P( i' [$ J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 N: E: S7 t9 Z2 K9 T; ~
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# A4 U& H) h2 l2 i
set intersections roads with
* D, L. [: z9 M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
N! n9 n4 D' q9 E" P& d+ ~ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]- {5 B* k; C( ]! A: |; H$ O; q
setup-intersections
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" Q6 Z+ f* W* b; R其中定义道路的句子,如下所示,是什么意思啊?4 u. _0 O9 n8 r, R5 M5 W# k
set roads patches with( B2 N7 g2 o- W ~5 I% c5 N' j+ T4 W
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, K# S3 N1 m$ W, P' W, }0 ~ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 e1 n6 e5 g& m3 S/ Q
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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