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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。
" b: n, `0 Y( V+ p$ Wnetlogo自带的social science--traffic grid这一例子当中,2 F L. {6 @! H+ l+ Y
globals
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) X# p0 v, |$ F' g. m+ b5 l grid-x-inc ;; the amount of patches in between two roads in the x direction
5 a# e# L. C" g6 h1 k grid-y-inc ;; the amount of patches in between two roads in the y direction
4 ` ], f4 m/ B6 l' D2 A3 } acceleration ;; the constant that controls how much a car speeds up or slows down by if6 _! c a, `& w' Q# \% E$ w) Z
;; it is to accelerate or decelerate
) i& [ a* V0 U. B$ Q5 ~7 Y ?$ u phase ;; keeps track of the phase8 c* E3 x1 j% K+ m) s" y% c6 @9 j( D/ M( u
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure; h* n2 u2 p( U/ O% j; Q! s1 M
current-light ;; the currently selected light
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;; patch agentsets. a0 ?, K& k5 Q& `1 Y2 s q6 u
intersections ;; agentset containing the patches that are intersections
+ d: d7 X% Z% @" J) x" n5 ~, n roads ;; agentset containing the patches that are roads
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|. r: V- k$ _. n2 ~3 ~5 rturtles-own: k. O( v! a# T5 T; d$ x4 M
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! h) g# r5 C/ Z. i" b speed ;; the speed of the turtle
) a' P/ t" J. d6 q" k+ H; D& i# X up-car? ;; true if the turtle moves downwards and false if it moves to the right, x4 N* ~9 \2 T: G" @( @
wait-time ;; the amount of time since the last time a turtle has moved
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* S( [/ |. {% @ ^patches-own
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intersection? ;; true if the patch is at the intersection of two roads
i" w; J( T* H% r6 n" w4 J8 h) b green-light-up? ;; true if the green light is above the intersection. otherwise, false.( \6 Z0 @% u9 W- J
;; false for a non-intersection patches.8 A# b! F) ?, ]/ J8 D% A& [( n, E8 [
my-row ;; the row of the intersection counting from the upper left corner of the
% `6 q1 P- I; Y( c1 k ;; world. -1 for non-intersection patches.
/ t& X, T5 ?+ ^8 M9 n: t& g+ i my-column ;; the column of the intersection counting from the upper left corner of the
- _8 m" r. I$ R! a7 Q* \. L ;; world. -1 for non-intersection patches.
! _1 B/ [( ^3 O* j my-phase ;; the phase for the intersection. -1 for non-intersection patches.8 X; k! I4 E' Q: u o
auto? ;; whether or not this intersection will switch automatically.! t4 S2 y# |% K& S
;; false for non-intersection patches.! `) x* P' G2 v! e# g
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;;;;;;;;;;;;;;;;;;;;;;
8 I1 D x; N8 a' ^7 ^! m;; Setup Procedures ;;
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- G( |" l: N% b( j& Y;; Initialize the display by giving the global and patch variables initial values.' `9 q5 ^7 H9 Z0 B; D" w8 D8 L
;; Create num-cars of turtles if there are enough road patches for one turtle to
7 F1 v3 {* _8 ?% j m) k; P; f;; be created per road patch. Set up the plots.
, s4 K% H( i* x9 ^& Ito setup
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4 P/ z$ i" Y* Q% ?* P) I* o setup-globals
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# ~3 i8 R3 p# c3 l! u ;; First we ask the patches to draw themselves and set up a few variables; Q& d& s$ y# E s$ H
setup-patches% L0 {; m6 H# Z( i% P& Z) B
make-current one-of intersections$ u, i" ?/ ?3 H' C
label-current
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6 x& X& k% B, f! j6 j* T" R* f set-default-shape turtles "car"
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if (num-cars > count roads): k6 P' ]" K' C! a) a
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% B) T2 i/ N) f1 c/ m- s/ | user-message (word "There are too many cars for the amount of "# K# x6 n* E. A) I9 a" n
"road. Either increase the amount of roads "
/ ?% |3 X, P& V3 [ "by increasing the GRID-SIZE-X or "0 Z* n! e4 ~8 i6 J3 r
"GRID-SIZE-Y sliders, or decrease the "
( ], l3 U5 y! n0 M: j9 ~ "number of cars by lowering the NUMBER slider.\n"
& K$ v B% U# _. i- r3 f& B1 A "The setup has stopped.")
, U, Q$ H3 ]* k" y1 k9 O1 S c stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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setup-cars# o' V. \' s" L$ m
set-car-color' F. I2 p' {1 Y5 o
record-data
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;; give the turtles an initial speed
3 q" |" L C. p, V6 A6 { ask turtles [ set-car-speed ]
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reset-ticks( I. P" l- @) ]2 E& j7 w
end
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;; Initialize the global variables to appropriate values
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4 {1 C& |/ I+ t: ] set current-light nobody ;; just for now, since there are no lights yet
; a# A* j/ z8 F/ k% J; z. F set phase 0
+ h6 T0 H$ e, K7 E' \6 V set num-cars-stopped 0
8 D" O0 D+ ~7 ]8 L6 w d: i5 c set grid-x-inc world-width / grid-size-x
1 P4 H: T2 H4 L* i set grid-y-inc world-height / grid-size-y
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# d) ?) `4 e, ~( S' _& r ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ W) n/ w: i( c, f" E* ~ set acceleration 0.099. n3 _0 T, I$ C
end: u5 {; L: y, r3 J
: P( S7 C0 U: |6 |4 _9 K4 ?7 I;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
?( \8 o( g6 t0 W, A5 N;; and initialize the traffic lights to one setting
, H7 ]' ~/ K7 M" [# \4 q& a9 Mto setup-patches. {7 V, t7 K2 O6 {% l2 j$ o
;; initialize the patch-owned variables and color the patches to a base-color( U- z9 Q9 y0 \% m( M# X2 A. L
ask patches$ k( O9 d2 D b0 R) m$ R1 P
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set intersection? false$ w d9 r. G# i0 J; p; r& `
set auto? false
' a/ y( _& b5 b& H4 T$ W set green-light-up? true
8 o8 c/ p1 M# s2 [8 k1 K set my-row -1( U. [' K2 C' k5 K' _4 A) q" P6 F6 A
set my-column -13 z! c. e. z/ m0 I3 X5 U4 O7 e) N- M
set my-phase -1- W+ L6 g) j' u, ^7 X% j x$ B
set pcolor brown + 3; i) f" _6 Q2 Q" c( q
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+ P0 {1 s' ~6 W# e9 v ;; initialize the global variables that hold patch agentsets
0 M, ?9 F t) m: f7 e set roads patches with9 e# k" J+ y0 d( w5 ?" m, `9 _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or M1 P: {( N n M# R
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; G( w, l! c, D( S
set intersections roads with$ a, O( J( \! ^2 f3 |, r! s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and' K: C! e: E n0 H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( y4 G! H8 F2 F
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ask roads [ set pcolor white ]9 [9 m* A5 {# `1 D9 t
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?
: K# ?: |8 K, N3 `5 N9 j set roads patches with8 Z3 Z j: Q1 ~# N0 Z: ~$ z( F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- _9 J4 e! O! X8 a7 \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)], s0 }$ H: v0 _
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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