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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。
% U$ o' {7 \) v) ^" \; W& inetlogo自带的social science--traffic grid这一例子当中,- b+ L7 D/ C# A9 i) E
globals9 [4 t$ T6 q/ B. v, w% M
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grid-x-inc ;; the amount of patches in between two roads in the x direction4 y- x1 u1 h6 J5 ~: b4 S
grid-y-inc ;; the amount of patches in between two roads in the y direction
" {+ \5 C7 t, B2 \! r ~9 ]4 w2 F acceleration ;; the constant that controls how much a car speeds up or slows down by if8 P9 y7 ~; A3 N# [( c# u: ?
;; it is to accelerate or decelerate# ~2 p# t) f8 E+ D
phase ;; keeps track of the phase2 J% S8 x% X) a3 Q5 C
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 q" W- y6 X3 Z2 G current-light ;; the currently selected light7 i% F" [6 n$ ~0 J {
1 q, \1 r. t" h4 C: t7 v ;; patch agentsets; W1 n- ?) G) o# y/ ~& T0 s& ?
intersections ;; agentset containing the patches that are intersections q( L7 X0 K' h( ^' b, k
roads ;; agentset containing the patches that are roads
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2 g9 g D, I1 B- Bturtles-own+ m0 ^# r0 l7 u Z% Q+ f
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speed ;; the speed of the turtle
8 f+ N! ^$ l, @ up-car? ;; true if the turtle moves downwards and false if it moves to the right
. f/ c- U! ?8 W wait-time ;; the amount of time since the last time a turtle has moved
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1 o; k* r* S# e" F! y7 u" g( w# Ipatches-own
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intersection? ;; true if the patch is at the intersection of two roads- U9 K/ t2 Z8 g7 |( B
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
, L9 W( B! l$ D, G ;; false for a non-intersection patches.
. h# b( A1 Y& {8 I my-row ;; the row of the intersection counting from the upper left corner of the
: r0 s! c9 u4 J9 h9 Z7 h9 h ;; world. -1 for non-intersection patches.2 o' n' f- D0 l! L. E- @& T$ W4 r
my-column ;; the column of the intersection counting from the upper left corner of the1 o/ d) @# ]) U- [9 |) i
;; world. -1 for non-intersection patches.
* h5 d: c/ |7 |! r. `8 l my-phase ;; the phase for the intersection. -1 for non-intersection patches./ B* t4 K6 c4 c0 y% v- u
auto? ;; whether or not this intersection will switch automatically.
$ Y3 V3 r) C$ G8 n1 r ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;2 |& H0 x( e0 d5 d) L( E8 C
;; Setup Procedures ;;
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: p& d7 |$ a# [6 h2 C;; Initialize the display by giving the global and patch variables initial values.
7 j6 g7 j+ A1 j+ H; }# X2 s;; Create num-cars of turtles if there are enough road patches for one turtle to( {& V0 B' W9 e& n3 a7 P
;; be created per road patch. Set up the plots.
0 T! E1 S8 U( Y. bto setup
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setup-globals+ q) o9 A" @+ i; L2 B3 m2 |" `2 E1 V
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;; First we ask the patches to draw themselves and set up a few variables! t2 S k& v% _9 S1 m( P2 F0 U
setup-patches y4 I4 ^4 B+ p' k( k
make-current one-of intersections3 K0 P. s% m( o" K& p0 |9 p; h
label-current4 x! {# L% z4 g
! F8 G& w* F4 B3 v" z$ t h3 a set-default-shape turtles "car" I% ^* G! T, ?6 S# {- U8 w
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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 "
! Y( {- Z& A5 s4 I" S "road. Either increase the amount of roads "
|; {7 k/ i' y, T/ \1 D6 D "by increasing the GRID-SIZE-X or "
( a! e2 m- F U$ y7 Q "GRID-SIZE-Y sliders, or decrease the "1 n ^2 p0 m% Z1 v/ D7 `4 J
"number of cars by lowering the NUMBER slider.\n"- A, t9 U( ?' I, ~8 q! Q( \$ {
"The setup has stopped.")
3 M: l4 R$ a1 r( m stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ s9 G( Y4 h( n3 x+ }; l2 { crt num-cars
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setup-cars
% }3 H$ _$ N! J6 T: v% H1 x+ j set-car-color( n( v; t6 p+ k
record-data6 O) J5 w4 R. f
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;; give the turtles an initial speed+ g/ J) o8 P$ u: K( X% V" T
ask turtles [ set-car-speed ]
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6 U4 I* W, I: N+ r+ ^ reset-ticks
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3 @' s, C+ e8 G" Z/ M4 }$ l4 P;; Initialize the global variables to appropriate values: m$ j1 B+ {9 [( P# E
to setup-globals
. R5 M+ _" H g. ?, J/ B set current-light nobody ;; just for now, since there are no lights yet
( C3 t V# b2 O. K# T set phase 03 |- U, a+ J# O- F1 Q$ n
set num-cars-stopped 0/ m6 s4 Y% D9 e# z! l& m: H) ^
set grid-x-inc world-width / grid-size-x6 j0 }: J5 I' ~0 d2 ~8 p
set grid-y-inc world-height / grid-size-y
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" R% {, {! c; A: ~/ k- y$ Q/ t ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary4 g0 N- s! ^: n7 `0 A+ t
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 a, T9 p! A4 ~! `8 T( P;; and initialize the traffic lights to one setting
) U* S1 X: L; ~& |4 wto setup-patches" W, h& K% z' P+ u3 F
;; initialize the patch-owned variables and color the patches to a base-color
* Y& ?8 ]/ y ]! w0 G4 G! O ask patches
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( @! T; m" I" m2 z set intersection? false% |: Z4 @5 L5 u! V7 i
set auto? false* [) M! N( I2 `/ d3 y7 _. K) \
set green-light-up? true
) K" t3 v2 ^+ X' G: K* W set my-row -1
9 v' z/ y8 y! R% n% A set my-column -1/ G4 _+ k& f! O" L# A7 p
set my-phase -1
( Z" c* X- }" C/ [ set pcolor brown + 3; _, L+ A1 J* V4 q1 o$ Y
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;; initialize the global variables that hold patch agentsets
4 _2 r Y/ A( y# R, V set roads patches with0 @% s4 R1 o7 x3 ~9 A5 p8 @- B7 f5 M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 ~0 X" k; w0 l* q* X5 A( G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; P8 a i2 f+ h( c/ I set intersections roads with8 H0 t1 z3 t6 f$ g* Q/ @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 z1 k: t" z( \; r% o8 h
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?. {) I% p' B# o; Z* Q5 T7 F
set roads patches with
8 Y9 {/ L4 b0 L- \- `( W+ c# ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 f, p; T' |9 A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 z% S5 k; B& u3 C$ t' m; f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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