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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。 c+ F0 O! W$ s& C
netlogo自带的social science--traffic grid这一例子当中,1 w- f8 p6 z" s* d4 U( b7 }
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction+ m3 R# ^! H6 B) o, S( @, v
grid-y-inc ;; the amount of patches in between two roads in the y direction
9 e* l4 W2 g* p2 ~, w& u7 Y acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 f/ d2 V6 @# _0 M ;; it is to accelerate or decelerate
' {. R; P+ Z1 I. ?& C phase ;; keeps track of the phase
/ q% u9 n+ x" b8 p4 t& Z2 V0 D num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 s5 K& ?7 y- H
current-light ;; the currently selected light4 K6 E2 t* J9 H
, l2 Y; e( L9 n* o0 Y+ w; I6 [ ;; patch agentsets
& S6 \ U/ t* |2 r: x9 B6 `" j intersections ;; agentset containing the patches that are intersections
" o, o8 y4 r; V% w roads ;; agentset containing the patches that are roads- y$ x' K# F+ g
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; C5 w# Y$ f; c4 ]- o! Eturtles-own. z+ Y, O# Q6 c8 p* D
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speed ;; the speed of the turtle- J" f) M+ V$ Z
up-car? ;; true if the turtle moves downwards and false if it moves to the right
; l+ r3 X% O; K: V$ \) U wait-time ;; the amount of time since the last time a turtle has moved; f0 e. ?% ?4 }8 u/ x3 Q
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patches-own. p6 t* k5 I$ C: C" C$ L d
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r3 z6 D7 n: Y/ ~6 i3 G7 z intersection? ;; true if the patch is at the intersection of two roads, r) f' g! O& U8 ^& G; e& u
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
; Z3 v& B3 Z. n; d1 w3 x ;; false for a non-intersection patches.
u; p- ?" ]' h; b$ S my-row ;; the row of the intersection counting from the upper left corner of the
3 d, v$ |) A7 O( t ;; world. -1 for non-intersection patches.# o1 J: p6 w$ K: o( B! S' A
my-column ;; the column of the intersection counting from the upper left corner of the; L# E' S$ b% k, d3 W' H) X
;; world. -1 for non-intersection patches.
6 c3 `# W6 W& p3 I5 |6 B my-phase ;; the phase for the intersection. -1 for non-intersection patches.6 L0 M( K, i9 Z: F
auto? ;; whether or not this intersection will switch automatically.
2 A; @( z. I/ T% \; K7 z ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;1 Q0 W, l! c! l& r. ]) H
;; Setup Procedures ;;' \* E H+ {3 Z ?% u( |
;;;;;;;;;;;;;;;;;;;;;;4 Z4 w1 O) ^: q) K. P: J
7 U; O7 b- X3 w; g4 b3 `;; Initialize the display by giving the global and patch variables initial values.
# o- Z4 F. |, g; U/ U8 R/ H;; Create num-cars of turtles if there are enough road patches for one turtle to& J9 \ |# k+ p5 H
;; be created per road patch. Set up the plots.
( N3 @- W$ D9 L# Gto setup! E/ ?) H" s# ^+ o
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setup-globals
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0 d) @+ w g9 n; o9 J ;; First we ask the patches to draw themselves and set up a few variables* h" U5 i6 {" \ t
setup-patches5 k6 w/ u2 d1 a9 c {
make-current one-of intersections
4 r$ x, P) y/ O9 u9 S- @* V% k- a label-current
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set-default-shape turtles "car"
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; Z5 _+ j9 C' Y& t+ F; f, X if (num-cars > count roads)
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2 U1 E" u: N9 I user-message (word "There are too many cars for the amount of "/ [5 |: h' X3 A5 h
"road. Either increase the amount of roads "
W; T2 B* @5 r( y0 L F# }9 B "by increasing the GRID-SIZE-X or "* O1 n# S1 Z" d k8 D* j
"GRID-SIZE-Y sliders, or decrease the "
9 ^) d( b! S" r# g; S: p: E( w! O7 l "number of cars by lowering the NUMBER slider.\n"
, h- p- h( w/ c4 }6 u5 C "The setup has stopped.")0 b& d% F6 g% P, s( n" c# b8 z
stop: v3 I6 T$ R/ d
]
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. ~4 }8 ~+ |- q1 F$ H+ q0 }4 d1 x- E ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ f) p. }) ]9 W9 Q# L$ \
crt num-cars4 X" m( }8 ]9 Y
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/ F% t8 t9 d2 ~3 X setup-cars4 A0 M4 p3 w; w$ r4 O1 R
set-car-color
7 [2 [( }% b2 S; d) R3 [ record-data
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;; give the turtles an initial speed
+ ]4 Y; ]$ T* Z4 I. a ask turtles [ set-car-speed ]
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) b& n3 @, B# f: o8 m- R reset-ticks& B# T2 N# Y C" Y7 d* r
end
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1 C; m- \! O! t( }5 T! q;; Initialize the global variables to appropriate values
! H* \ F4 \; v8 c2 a! ~to setup-globals
" t+ f3 d' [: D& g set current-light nobody ;; just for now, since there are no lights yet+ g9 R! f0 Z) P2 S A4 }: h, G6 g, [
set phase 0
+ \5 a9 q2 Z4 }, S" a! P set num-cars-stopped 0( L; ]2 r1 X3 v8 C
set grid-x-inc world-width / grid-size-x
+ ]5 O4 K/ S7 g set grid-y-inc world-height / grid-size-y/ }2 U+ \6 i- V4 f
! @$ s' `3 c, [, W8 H! O- P ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( t, o. u- h5 ]1 t+ n. [
set acceleration 0.0990 A/ o7 O/ n" h9 P- f& x- K X
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, a; v- |- Y7 [' |8 |; E: F;; and initialize the traffic lights to one setting
, N0 k* I k2 L- t. v; |to setup-patches, p! b) ^; T5 y8 @
;; initialize the patch-owned variables and color the patches to a base-color3 U7 P( c1 `, m& [8 O) ^
ask patches2 s- Q% X0 @$ f6 y0 E g
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$ @4 H+ v" z3 z: e: _$ L$ H* u* C0 u set intersection? false3 N) @( x i* x9 f. N' I
set auto? false
2 c* D `5 V' y: d( r) D: j0 t0 V set green-light-up? true" u1 C$ e0 O. ]/ S' ]/ M
set my-row -1
6 e7 ~8 N0 Z9 ?! m( h( S/ A+ ] set my-column -1
6 [# A& v6 l* s% U$ j! n set my-phase -14 n- n) B% T2 h# h3 Q4 y& W( p
set pcolor brown + 3. L: y0 M i# D4 c1 }3 Y- S
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% q, b/ k# K( @* V# }- Z4 S7 [ ;; initialize the global variables that hold patch agentsets
0 `( e8 g5 I5 ]1 ~ set roads patches with
' @& D1 `$ H, j" P1 Q5 B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# d$ L8 Z" A1 U2 j0 c7 d% Z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 c) [. _; M" o- P/ C" V) r set intersections roads with+ S/ X& t) |7 b7 s. @' U
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) J1 n A: o- L7 e' s- G5 j$ r { (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( m7 B0 G* j3 d7 o9 x
8 U7 w Y3 }# v6 k0 i/ l6 ] ask roads [ set pcolor white ]* c4 v( Y+ z6 Z, H, \: J' z2 o
setup-intersections
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* n3 p$ I7 `, T' d) H; q& s3 X2 h其中定义道路的句子,如下所示,是什么意思啊?
3 E3 X0 _6 c+ |/ ]0 F set roads patches with) J2 R8 Y" P# Z9 {/ S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: `* C% N" |0 B# b3 B/ _1 H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ f) d+ h+ \( z, w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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