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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。# i8 w" U" i, k$ v
netlogo自带的social science--traffic grid这一例子当中,/ ~, D6 @- P7 K1 z6 {4 l" L) m9 s9 M: D
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction2 p# v/ l' i1 E) f$ X
grid-y-inc ;; the amount of patches in between two roads in the y direction- x% Q$ e1 q1 F! P+ G* f( a
acceleration ;; the constant that controls how much a car speeds up or slows down by if
- M# X8 P2 `9 E ;; it is to accelerate or decelerate* m7 u( I0 f/ U; V. f
phase ;; keeps track of the phase
) L I( Y) L! w# ^% p num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
3 d" Z( k- L5 f$ ]8 w, z) V7 [( z, ^ current-light ;; the currently selected light3 W! e4 I& Y- r) \) _( l k
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;; patch agentsets
6 H# @+ {' Z( }( C4 a2 \/ t$ j! Y intersections ;; agentset containing the patches that are intersections* x# E8 \* I( p+ Z4 a$ c
roads ;; agentset containing the patches that are roads# Z0 F' {! w4 @" @" b7 p
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turtles-own; Y4 l) I; f6 Z% e
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speed ;; the speed of the turtle; l7 S; m$ s( P! j0 k {
up-car? ;; true if the turtle moves downwards and false if it moves to the right( d% t* k7 X* t5 V+ h. D- ~9 p0 b( Q
wait-time ;; the amount of time since the last time a turtle has moved9 Q- a6 w0 J$ I! x5 t
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" J* f- U0 A$ L9 W, tpatches-own
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1 d. ^6 H$ e4 f intersection? ;; true if the patch is at the intersection of two roads
* ]9 S" h( X" b/ k) P, o4 G green-light-up? ;; true if the green light is above the intersection. otherwise, false.
8 U) I. l$ I0 x( C: k! ^1 f ;; false for a non-intersection patches.
2 q$ a: u! p n0 v+ d my-row ;; the row of the intersection counting from the upper left corner of the9 d; v T$ K2 x" j8 `5 r- T% @$ U
;; world. -1 for non-intersection patches.. R. k# A- b6 o( U' ` m
my-column ;; the column of the intersection counting from the upper left corner of the H" f5 L6 g3 k. w6 Z& h' [6 _
;; world. -1 for non-intersection patches./ o* x& S+ L+ i
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
, l. I [# ? u% T$ @ auto? ;; whether or not this intersection will switch automatically.& `5 F1 r5 [# z. I. z' ~
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
% ?6 i& m2 t0 ~;; Setup Procedures ;;
# f0 A0 M; R) [5 p;;;;;;;;;;;;;;;;;;;;;;
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. H. k- ^% p8 c9 A% m;; Initialize the display by giving the global and patch variables initial values.$ f1 T* D& @3 H) |9 X/ o
;; Create num-cars of turtles if there are enough road patches for one turtle to
, h/ @ Z9 e7 {9 B5 v: y: X% z1 P;; be created per road patch. Set up the plots.' @ @# L' z! o; d p3 \
to setup
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setup-globals, H3 p/ _ }3 G& ^+ k+ G2 v
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;; First we ask the patches to draw themselves and set up a few variables
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make-current one-of intersections! ]. v3 V& X8 t, w0 N7 T2 l4 C9 t
label-current9 C( \. ?9 Q2 \: n
5 \0 L7 h: d! k- d set-default-shape turtles "car"
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/ A0 h* u0 Z/ w9 C0 ?1 Q) y% C if (num-cars > count roads)3 y$ O2 m) \4 o- { e
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1 `/ }1 o" C( ? user-message (word "There are too many cars for the amount of "5 Q! B; o/ q; g& Y, a
"road. Either increase the amount of roads ", _5 {+ {7 H! c8 d0 S
"by increasing the GRID-SIZE-X or "
4 J2 B9 P( A, F% Y7 T) n2 {: P f! O "GRID-SIZE-Y sliders, or decrease the "; g6 c4 l# A0 \- U. |
"number of cars by lowering the NUMBER slider.\n"
" f1 i: @ i* h4 I8 ? "The setup has stopped.")3 J/ Z A7 F2 t* E0 Q
stop& y7 j; [- h+ w' v# D
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ z6 I& g, l# f" `7 M2 I crt num-cars
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setup-cars1 F" d$ x [3 V# y
set-car-color1 n$ n W/ c, G, n4 D$ m+ b" z
record-data
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;; give the turtles an initial speed/ i$ I* d( m0 C$ q4 n3 U
ask turtles [ set-car-speed ]2 q8 U8 P% X; U _
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reset-ticks
- q7 X! {& N' ^* b$ E' t$ j7 ~( b9 W# Tend
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;; Initialize the global variables to appropriate values
' @: {3 a( f* H$ \( U$ D! @to setup-globals
+ f9 u+ r2 R: r, j& L7 u2 T7 g, B: P set current-light nobody ;; just for now, since there are no lights yet
9 O. M+ k1 i* M9 C set phase 0
/ ]2 I8 b/ ~5 u0 k5 ` set num-cars-stopped 0& X$ I1 h( G: E# ^! ]
set grid-x-inc world-width / grid-size-x, ]& o* T- B7 e9 e
set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. y9 s- u$ w& t6 i. p+ b p& X set acceleration 0.099
8 c8 @/ I, K: Z( F1 yend
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2 ?6 L, o: h' e( R0 s;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
) @) }) ~+ o6 C# |. c;; and initialize the traffic lights to one setting8 W. M1 }& o4 ^" Q/ G2 j# \4 l/ `
to setup-patches
3 e$ b* l: Q- N/ L: C ;; initialize the patch-owned variables and color the patches to a base-color
" F: E. a+ S" U- z& N" a1 m ask patches
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2 s" K I; Z7 P9 X: w9 {. _' Q set intersection? false- |+ O O$ T( x8 T- a
set auto? false
b ?1 e/ t: P; B) B; o# t set green-light-up? true
?- ~, x) h. y3 U3 T7 j; a set my-row -1
6 m8 V. I' f, R% T4 Q set my-column -14 P" E, W, m$ Y' O
set my-phase -1* [3 A9 ]( @, p6 Y
set pcolor brown + 39 H. y7 H) V" m5 b7 F& s
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9 q& \' ]- U6 ]; q ;; initialize the global variables that hold patch agentsets8 `# d( X% g' `, |
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ W/ ^# L9 q8 q set intersections roads with1 A7 j, ~+ V6 v2 P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 r# c+ g4 P+ w. ^ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; k! x0 _: ]7 S2 }5 e
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ask roads [ set pcolor white ]/ F- `/ \ x: B9 d- P3 u
setup-intersections
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! u( R& |% {; {3 V3 D5 [其中定义道路的句子,如下所示,是什么意思啊?, Z3 l! ~' b$ ?0 I& k
set roads patches with
, X6 r# B' N, { u$ m9 a [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: t- p2 w- f* n9 @3 T (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ V! P* f( c( `/ g0 j3 }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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