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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。4 r/ j& q6 B9 q2 K3 p5 p+ `8 F4 }0 G
netlogo自带的social science--traffic grid这一例子当中,
" B6 N/ s' s5 |- M/ c5 {globals
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, Q) I) n( ~( r" |# F% o4 L& Z0 [' M grid-x-inc ;; the amount of patches in between two roads in the x direction+ Z, V! Y- X- |" |1 |
grid-y-inc ;; the amount of patches in between two roads in the y direction
; A" q. l) K6 r: B4 N" }% U# l acceleration ;; the constant that controls how much a car speeds up or slows down by if
5 ?$ S; a$ u. P6 h+ k ;; it is to accelerate or decelerate: I! i9 }: s+ f: q- c
phase ;; keeps track of the phase! t2 ?9 C% G2 g. t9 {0 _ }, G
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
: Y; R+ ~! n: w u current-light ;; the currently selected light
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5 @: W; K1 u, K ;; patch agentsets
- t2 H* E* M8 `! B! K% e- P1 _3 {$ x intersections ;; agentset containing the patches that are intersections8 {( {2 P; I6 b" k1 U) X
roads ;; agentset containing the patches that are roads
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/ A' t, Q6 t: _6 c q" n4 c7 vturtles-own! x0 S. H# A7 I
[
/ ]- k; c4 Y* g* r4 [ speed ;; the speed of the turtle# ^' F7 |( @ w( A9 j
up-car? ;; true if the turtle moves downwards and false if it moves to the right
5 T) X1 V! W" _* ]" r+ F' J wait-time ;; the amount of time since the last time a turtle has moved
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. a2 [! [7 n& G4 R9 {patches-own
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0 a; P6 B0 d: ~ intersection? ;; true if the patch is at the intersection of two roads
9 I, h# k m% y H: M green-light-up? ;; true if the green light is above the intersection. otherwise, false., N6 t1 C& n0 M" C2 v5 w
;; false for a non-intersection patches.
1 e% J, r, v1 \ my-row ;; the row of the intersection counting from the upper left corner of the
# D0 U+ H A+ A' J ;; world. -1 for non-intersection patches.
: i' F( t# [/ Y+ |/ @) ` my-column ;; the column of the intersection counting from the upper left corner of the+ ]% r8 ]# f3 p( l6 m
;; world. -1 for non-intersection patches.. ^; P; x, ~4 C5 R3 \' U
my-phase ;; the phase for the intersection. -1 for non-intersection patches.' c+ O& d% g& s6 q5 X2 R
auto? ;; whether or not this intersection will switch automatically.4 X9 |* n; J- C9 V9 }
;; false for non-intersection patches.2 h( A% I# D2 `( P
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! c7 X# \( Z0 x. I9 b- T8 @;;;;;;;;;;;;;;;;;;;;;;0 @) }0 U" `- @8 N6 O6 s
;; Setup Procedures ;;
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! R& n/ M6 H! g;; Initialize the display by giving the global and patch variables initial values.7 F5 P. I# Y/ }7 w! ]4 @+ J+ K5 u
;; Create num-cars of turtles if there are enough road patches for one turtle to( K; B) N7 Y6 N6 \3 U5 a( L
;; be created per road patch. Set up the plots.
5 O4 H Z3 N- i# xto setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables. h% h3 a3 I! d! k" A' Z$ u
setup-patches
6 A9 S" d# h2 }7 V. t make-current one-of intersections5 p9 j) X, O9 L
label-current7 a: P" N% h0 v# N5 d# o
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set-default-shape turtles "car"+ O2 h+ x# R& K! C7 X0 X# O3 |
& _! Y1 F# p" b1 ? if (num-cars > count roads)7 ~0 E7 C; m9 K) C" E8 ?. B/ h1 J
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& q. e9 ~$ w0 W9 q. z4 s5 U user-message (word "There are too many cars for the amount of "1 e3 K' m- B# r7 G D. v
"road. Either increase the amount of roads ": a9 O( }8 B& F
"by increasing the GRID-SIZE-X or "4 L) ~ R; H8 i% U: q, f, `5 ~. R
"GRID-SIZE-Y sliders, or decrease the "
1 L' d8 m7 a, I0 X "number of cars by lowering the NUMBER slider.\n") }' u- I" h6 O$ H6 Y
"The setup has stopped.")& y$ X- P0 }4 O
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
# @ o! d) |! Z6 Q2 n' r O+ E6 d crt num-cars7 L! `$ @" S) O1 S$ N' b: a# M
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4 e1 a W# `' x& v setup-cars
1 x. o: J" i# @7 |- c" Q8 | set-car-color1 z, i% z/ [6 p9 J( J0 |! v
record-data
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;; give the turtles an initial speed
0 `% w; t6 C2 ] ask turtles [ set-car-speed ]" j+ N# F4 |9 K1 c
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reset-ticks
) S) [9 Z! h2 T2 Nend
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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
# y# r) B8 M/ P$ e1 i set phase 0
3 r; \3 d0 u3 x& _ set num-cars-stopped 01 e' ?8 ^8 D7 I
set grid-x-inc world-width / grid-size-x
0 y0 d6 e3 p: v. n5 U% K8 F0 }& z set grid-y-inc world-height / grid-size-y# @* d4 [8 \9 m2 T: I
$ S7 t( q! d& R% s# `& _ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
8 @8 a2 o, {5 g5 O; j7 L set acceleration 0.099" Y# B! s" D" \+ ]" W6 _
end* Y* y6 k0 C v+ Z G0 Q5 j6 W" X
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, X, i: ^ i9 [9 N) ~! u, B% |
;; and initialize the traffic lights to one setting
) L: ?: h$ c: z* s$ \7 ^. jto setup-patches; I$ j' r# k/ K4 }9 B8 s" f" X7 p; s
;; initialize the patch-owned variables and color the patches to a base-color
$ t5 q; c* Y) O ~1 n" ?) W7 g& i ask patches
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6 m7 L7 r1 |9 ^$ i% ]. h; G( W set intersection? false: e$ C, G/ j1 D W% W; x
set auto? false, N7 H( r6 w& n) ^) ]* v0 A/ A
set green-light-up? true/ @( v& @- P+ h* N7 w' I
set my-row -1
7 F7 \& P" E( v set my-column -1
+ ^% B3 ^% c% R" [5 _4 P set my-phase -1% E2 y9 `1 s8 M( M) U
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets6 O3 J$ J1 L$ Y
set roads patches with
" I, o. C5 H& W( T# J0 k' O& ~6 [ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. |; b ]1 J3 I1 ~" |$ q7 N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) w9 ^5 o' ^0 Z9 f* G, S% K
set intersections roads with) `7 h" p. M* G1 ?4 f0 {) E& ^% L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ @# v" x M0 z# q' E% l6 R
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]( f4 L6 i% ]" Z" m8 G5 Y5 G
setup-intersections5 r; @) ~; F* I( m2 z) Y
end7 Q& y- d* D4 g; ^- g. l. _) A* R
其中定义道路的句子,如下所示,是什么意思啊?
( S. q( A! K3 L- f( y- B set roads patches with+ D7 }9 m. n/ ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ ?0 |5 X6 k3 @2 C) @: X (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! u: X% r' ]% Z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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