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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。
?7 @! W& E' V8 P1 J3 ~netlogo自带的social science--traffic grid这一例子当中,
! I) j! l$ ^# Lglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
& R" V* I. w) }3 ^% e( l$ r grid-y-inc ;; the amount of patches in between two roads in the y direction
$ V* O& }7 K* a4 i) o acceleration ;; the constant that controls how much a car speeds up or slows down by if
( B$ D$ [) ?3 R: H ;; it is to accelerate or decelerate
5 p2 t9 p$ h' F' H1 H phase ;; keeps track of the phase
$ c# v$ S- P, V0 B: C$ R1 B% y num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% j! L* X8 g2 c current-light ;; the currently selected light
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;; patch agentsets
* l- X; [' ~) h8 i intersections ;; agentset containing the patches that are intersections
0 u' E( ?: d$ O0 O2 | roads ;; agentset containing the patches that are roads, s0 o. y* F! `# _# v; d- X
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: F0 P1 r2 K2 d7 C8 mturtles-own
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speed ;; the speed of the turtle
, ]% N' {/ V, Z! Z6 q up-car? ;; true if the turtle moves downwards and false if it moves to the right
2 ~2 }* @8 s7 B; l( ?7 e wait-time ;; the amount of time since the last time a turtle has moved
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/ K' W% o. e5 s! Fpatches-own& r* k, B3 @6 ^) y- f j
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intersection? ;; true if the patch is at the intersection of two roads, C1 e* Z) x% }' ]' W# j5 H3 v6 a
green-light-up? ;; true if the green light is above the intersection. otherwise, false.( w; Q! r( F9 W: |# S1 l5 w
;; false for a non-intersection patches.0 \* v% U. \/ E* I% a
my-row ;; the row of the intersection counting from the upper left corner of the! m$ a. U2 j5 Q
;; world. -1 for non-intersection patches.+ {0 p, N% l$ J3 Q5 l' w- j
my-column ;; the column of the intersection counting from the upper left corner of the$ q; e: j. g( k! M& }; u
;; world. -1 for non-intersection patches.5 T5 e2 j9 a8 \+ ]
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
; M# q" U6 p/ i3 V, r auto? ;; whether or not this intersection will switch automatically.
1 C# o' b/ O7 i s& \; y* e1 Q$ h ;; false for non-intersection patches.
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9 ^+ \ f. I. l;;;;;;;;;;;;;;;;;;;;;;
6 {' c( R5 z: P/ U$ X;; Setup Procedures ;;* r1 z% b2 ?/ k: }5 p1 ^
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; v0 o) |3 `0 q+ K# _;; Initialize the display by giving the global and patch variables initial values.
$ D- @# d, P3 P& z8 W3 ];; Create num-cars of turtles if there are enough road patches for one turtle to
) }0 C. E4 _. C S/ q) X;; be created per road patch. Set up the plots.
' w! o5 V& b: H$ j5 ?8 l% O, h# |# _to setup7 g+ q+ D8 t/ @8 |) |1 [
ca
; X- y9 e |! }" L" o! i setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
: Q6 H5 u1 K4 V* k setup-patches0 r0 I( p& f- X" C+ e
make-current one-of intersections
( b* G) y1 V" O% l8 C! B% u& O label-current
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set-default-shape turtles "car". L4 |& u. D, w+ U, q! F
& Q! g7 Q8 u2 K if (num-cars > count roads)
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6 Z! }: {+ F3 z- t* P user-message (word "There are too many cars for the amount of "
! L6 N' r$ i7 \2 x& Q! U, q "road. Either increase the amount of roads "/ H$ G, E# Y1 d
"by increasing the GRID-SIZE-X or "$ g% B% c8 t& c! y) Y" N
"GRID-SIZE-Y sliders, or decrease the "
2 @6 N( r7 |$ [1 c$ H: Y "number of cars by lowering the NUMBER slider.\n"7 V6 j6 R' M y J7 b
"The setup has stopped.")1 I& b0 r& v& i8 u0 F: D6 B
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color4 {- ]* o. }0 T" P8 Q
crt num-cars
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setup-cars
! {6 h4 ]& J: Z% }3 ~, U set-car-color
) q# h1 J; ~! _- ^, A( `, S record-data
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9 U e- u, g+ g" S ;; give the turtles an initial speed
: {3 ^# j& l/ Q& \ ask turtles [ set-car-speed ]
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9 F0 }2 _, N2 `, W+ d$ w, K! I0 i, ` reset-ticks
) t. r6 l) }" ]4 wend
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;; Initialize the global variables to appropriate values ~$ G7 P, H0 k( }2 N
to setup-globals
; m$ j0 m4 \& l- E4 ]- ] set current-light nobody ;; just for now, since there are no lights yet
K8 m: y* F/ R" [1 S8 U+ d9 v set phase 0' w7 V; o# M: E) e
set num-cars-stopped 09 n6 b0 W$ k* l6 @
set grid-x-inc world-width / grid-size-x) C$ o# T4 n) y3 [ E4 [5 H
set grid-y-inc world-height / grid-size-y
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5 [4 z; P% m& o ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 l2 q0 Q T0 ~4 s5 @9 v1 V. {
set acceleration 0.099
& N. E7 ]& K9 ^4 F. k5 w4 Yend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, L5 u8 R" m2 Z% Y9 F;; and initialize the traffic lights to one setting8 M6 r4 L# b" j
to setup-patches5 i$ S1 Z; D0 f/ Z
;; initialize the patch-owned variables and color the patches to a base-color
9 U" Q% @' V, e: U0 h8 x5 l1 h ask patches
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set intersection? false( K* Q. H3 N1 y( M" y
set auto? false
% O4 [8 M7 w7 i5 h( v5 r; E6 L set green-light-up? true
1 }. L; f1 ~0 m5 H set my-row -1 H/ T( |2 i$ L' a# X/ D
set my-column -1; K5 T4 [" p7 [( `' r( v& o6 b
set my-phase -1
: P5 X* x# Y) E) H set pcolor brown + 3
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* _' ^3 r1 ?# m$ b9 b1 ~, G8 [ ;; initialize the global variables that hold patch agentsets
& A# y' p: r: {3 p set roads patches with$ v2 d; }" M; t& F% c; g9 H: ~+ k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 X+ J) D. f- F2 x8 A" l! Z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) H( h. \/ w, q2 g& E
set intersections roads with
' d7 A! A$ @5 W6 f6 W) I6 X& t5 A [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' y- {" s9 V n! [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" d4 @' V. ?0 [
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ask roads [ set pcolor white ]9 R- ~0 T/ G& d' ^- w* A; @
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?. A' ]2 G! r4 Q# |7 n
set roads patches with" e! B$ B! g- Z0 d2 B e' o
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( S: U" }& {! w: p- H! v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ z! \! x/ X, Q7 i
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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