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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。
1 [4 F" h' L3 Pnetlogo自带的social science--traffic grid这一例子当中,; S* x$ Y$ o) n5 s& n& L
globals
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9 T2 Y! ?5 r/ ~0 B grid-x-inc ;; the amount of patches in between two roads in the x direction2 U7 u/ X* [1 J" K p
grid-y-inc ;; the amount of patches in between two roads in the y direction
* Y' |& x( \3 k& B* o5 o- J, s: l acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 Z1 a1 R& B" |" Z2 P ;; it is to accelerate or decelerate
3 e4 w8 a1 s: m- R, r' Z4 C phase ;; keeps track of the phase
- D6 J, y$ l2 b! T" ?# Y num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
( o) O+ U- I9 {& U3 s current-light ;; the currently selected light; B4 Z v9 `, N8 V; e
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;; patch agentsets& d3 ]* U+ o+ ]
intersections ;; agentset containing the patches that are intersections
5 t0 R( V7 Z. o5 w; X( C6 s7 r roads ;; agentset containing the patches that are roads
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- `* q0 O2 c N+ bturtles-own
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: W9 _3 Q. v) g" B) N* G4 N speed ;; the speed of the turtle
9 n8 B- G" g* K. w$ k1 g5 H* o0 j/ Z6 T up-car? ;; true if the turtle moves downwards and false if it moves to the right
% e: S+ U8 m3 S9 }$ L 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
' H* N f+ d) h1 M) W" G green-light-up? ;; true if the green light is above the intersection. otherwise, false.
Q* } \! Q1 G2 T7 n ;; false for a non-intersection patches.
7 X, k! l4 K: v my-row ;; the row of the intersection counting from the upper left corner of the
( p! h; G' m9 t2 p' e8 S$ @: S+ O ;; world. -1 for non-intersection patches.
: Y0 p0 d8 H$ g: F' X) G my-column ;; the column of the intersection counting from the upper left corner of the
9 X5 K$ h1 ?) ^; J4 F ;; world. -1 for non-intersection patches.
7 _2 [5 K. P0 D- t- e my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( _$ R- G7 W" y3 Z% D: r auto? ;; whether or not this intersection will switch automatically.$ [; P# b( e$ Y. y
;; false for non-intersection patches.: G1 o# O) E6 F9 |% a
]
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4 n1 v8 T$ k" Y- Y+ r6 O* [( e;;;;;;;;;;;;;;;;;;;;;;7 T0 E, F k8 |: G8 R5 P. U3 E# k
;; Setup Procedures ;;( Y4 L$ ^* D+ o1 y4 j
;;;;;;;;;;;;;;;;;;;;;;& ]+ t6 X0 E- X- U# g! X$ ^& I
) T, c6 Y! `- Z* G; k;; Initialize the display by giving the global and patch variables initial values.
( d& ~$ B: e: W; ?" B;; Create num-cars of turtles if there are enough road patches for one turtle to n( Y: f4 w. W+ u: p% Y2 W
;; be created per road patch. Set up the plots.1 p! T* s8 J; Q0 n7 a
to setup
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;; First we ask the patches to draw themselves and set up a few variables
/ b* W" @% P( `* c& ~, G# u+ G setup-patches
9 `" w1 q: ]; I- T make-current one-of intersections
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set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
) i" i6 W. ]4 U5 q/ D% m$ T "road. Either increase the amount of roads "! ?6 l/ Z r2 X! G. \3 k$ I
"by increasing the GRID-SIZE-X or "! t0 L' j% U: q1 d
"GRID-SIZE-Y sliders, or decrease the "' s4 N& h/ n2 S- w
"number of cars by lowering the NUMBER slider.\n"0 x' ?8 M5 \$ B' O$ X2 `6 g& ^
"The setup has stopped.")' Q) X; R F [& g& J4 b
stop
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" w& A$ b2 K6 k4 y! Q k ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% s% Z _. c8 D# O, Z8 K1 b. C
crt num-cars6 i+ \% n8 \; b8 d. Y; F+ @
[
0 p3 r+ U$ t4 I. S: K6 m& m% ~ setup-cars
: L4 M a0 {3 _/ l/ n set-car-color5 g- W* H3 C2 o0 O# g: Z6 x2 J
record-data8 Q8 t( l) u8 w% {0 E8 s! c7 ^9 N9 q
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% q$ }9 L6 Q2 f" { [' F ;; give the turtles an initial speed' C! `) _; S0 L; z
ask turtles [ set-car-speed ]
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\ h/ W$ ^, E* } reset-ticks+ y% h* k; u3 D P9 w/ [
end/ z$ i1 z1 _8 h: T
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;; Initialize the global variables to appropriate values1 Q6 \5 a7 p, i
to setup-globals
" E+ @8 |' q" I [! i set current-light nobody ;; just for now, since there are no lights yet- T) {# n6 D; D ?: a
set phase 07 h- D+ f8 o( X* q& n
set num-cars-stopped 0
6 Z: N3 z) B; u8 u set grid-x-inc world-width / grid-size-x2 B" J* e4 k; X" F2 b
set grid-y-inc world-height / grid-size-y! Q; B2 G5 u7 S3 t8 X
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! F+ n& [0 k% s/ Z0 R1 J4 ] set acceleration 0.099 k( g9 g/ ^5 i2 \. D) R
end, I p( y+ w$ f+ X) f
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ f& E7 x* Q2 w9 k0 n: n$ x
;; and initialize the traffic lights to one setting/ D- \: P' o2 e6 ~5 u) t
to setup-patches
: a8 o% P- \3 u# l4 x) ]3 Y1 ~) |/ N ;; initialize the patch-owned variables and color the patches to a base-color1 h6 r: \! e# T# p* Z8 _( Z
ask patches, N6 ~1 p* \. Z w8 Y$ s* P2 ^1 g
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3 L* g3 d1 Y9 s set intersection? false0 `3 @! y0 b; G
set auto? false
! U' [ e. M; P/ m. Y4 l set green-light-up? true
Z; |: X0 e1 F. E set my-row -1: D6 [9 V$ H; q O' k; k$ ]$ ^" E% W
set my-column -1+ K2 L0 C9 ^5 N' W/ E% O
set my-phase -1
" Z2 N2 I! b% j/ K0 s! \ set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
1 Y1 S0 U/ [0 _' `; l4 ? set roads patches with
! Y7 }# @$ K& _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ I' n+ H0 | m5 @- W0 @* s. s
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% D" ^4 b/ B! p/ t( t set intersections roads with4 u3 i3 \! e, w: K) f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) L" s* f O/ j7 I# e (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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9 t+ N$ C4 I0 H3 @" q% e3 ?其中定义道路的句子,如下所示,是什么意思啊?
; ]0 P! q; d/ o6 m! G set roads patches with6 x9 S" G' V. c. Z. M6 f, I h, l& q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 u4 {( W2 _3 s
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! v# u7 g: u0 d& \& O
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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