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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。
/ Y, s- M7 X7 `$ Y) h7 }netlogo自带的social science--traffic grid这一例子当中,) X- D% `& d: j+ w
globals1 l; m' t u: v6 x: v- ~( g
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' x6 `, ?0 [+ W8 f0 h% O' F/ q grid-x-inc ;; the amount of patches in between two roads in the x direction
4 n, I) Y: W: Y9 T! K) a0 C2 Y, M- } grid-y-inc ;; the amount of patches in between two roads in the y direction
0 S" N- D, _- |3 S: | acceleration ;; the constant that controls how much a car speeds up or slows down by if
: ]/ {. J& P+ l9 e9 w: C$ a8 j! r ;; it is to accelerate or decelerate5 W3 h, n9 s8 X0 l$ A
phase ;; keeps track of the phase
8 O$ W6 y8 j! A8 Q" M8 W+ F num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ w7 |4 p9 D' e4 r5 z current-light ;; the currently selected light
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;; patch agentsets
( e3 v( a4 k. u2 b3 j2 ?" \: b intersections ;; agentset containing the patches that are intersections
2 U2 V, t( [, k8 D+ M8 T4 `1 U roads ;; agentset containing the patches that are roads
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turtles-own
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7 @% x, {' }4 J% p$ \% o speed ;; the speed of the turtle5 h) P, t% T, j7 B T
up-car? ;; true if the turtle moves downwards and false if it moves to the right
1 Q6 S9 z& x5 @: _0 R2 y4 z$ G) l wait-time ;; the amount of time since the last time a turtle has moved
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2 v, v% d5 c" g; ~6 w: h* u+ r7 `patches-own, r8 v3 V# `$ D0 l
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intersection? ;; true if the patch is at the intersection of two roads6 C" _0 N, o+ q4 _ @8 Z
green-light-up? ;; true if the green light is above the intersection. otherwise, false.' P" w% D1 |+ ^6 q
;; false for a non-intersection patches.: M! Y: ~. Y/ u: x' \" O
my-row ;; the row of the intersection counting from the upper left corner of the
) [7 d0 p6 Y. ` ;; world. -1 for non-intersection patches.
' Q9 e( x* E: H7 P- L7 l my-column ;; the column of the intersection counting from the upper left corner of the; R; b0 P) W- V
;; world. -1 for non-intersection patches.! {3 D, Z( r: T4 c
my-phase ;; the phase for the intersection. -1 for non-intersection patches.* u0 j& F& H: @5 i6 A2 e
auto? ;; whether or not this intersection will switch automatically.- a& [7 `+ {4 [: s: i
;; false for non-intersection patches.
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) Y8 e/ ]! b* a b; z;;;;;;;;;;;;;;;;;;;;;;: p3 X, L0 h' X
;; Setup Procedures ;;6 G# w+ K. }0 j* O6 x
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.* d4 K' O# F- i* F4 [
;; Create num-cars of turtles if there are enough road patches for one turtle to
5 k: s: ~0 M; j m;; be created per road patch. Set up the plots.
: H2 | [: C1 O5 ]" O4 A6 S; zto setup
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. O4 m: w, w6 w: j) x4 e, v setup-globals, I3 i! _# M1 `- ~& N. m8 Y
0 {7 {& A1 |! Q ;; First we ask the patches to draw themselves and set up a few variables
+ l8 u) Q" k. J setup-patches6 e+ o* K: r$ D. Y
make-current one-of intersections: G: X3 V( |# O& \0 }* ^
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)$ t! u( L1 B( C- G
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user-message (word "There are too many cars for the amount of "0 T4 j7 Z# n6 M8 [
"road. Either increase the amount of roads "
: }! N+ x3 p1 @! |1 b8 e( ` "by increasing the GRID-SIZE-X or "7 ~6 G3 m* F. I- @' q" E# V
"GRID-SIZE-Y sliders, or decrease the "
6 e& q8 Q8 V* n. _/ s "number of cars by lowering the NUMBER slider.\n"
0 h* j+ a1 Y7 w. a, F$ t "The setup has stopped.")
% p/ s) L3 R4 N1 T stop: G& q% G4 n% C
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 R9 T+ d4 _9 \( n/ \ crt num-cars
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setup-cars
; ^6 A1 t: h' L2 G- n set-car-color
# U+ z) f1 {7 I- p record-data" {# ~( P$ X5 b# f
]
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;; give the turtles an initial speed
9 C6 o, v ?0 f2 L ask turtles [ set-car-speed ]
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6 [# B# m5 W4 _6 U* E! [ g- h reset-ticks
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! u- s, B5 f) F) G& P" K* y;; Initialize the global variables to appropriate values& ?* r- f& F4 N* L `+ ?& d6 B
to setup-globals4 X# @9 |6 Z3 y" w6 }8 @% B
set current-light nobody ;; just for now, since there are no lights yet
O8 d' ^5 d9 k- R: Y) Q5 ~ set phase 02 [( r: T) t+ T3 K
set num-cars-stopped 0
7 f! c3 h& ?2 }, w7 t3 i set grid-x-inc world-width / grid-size-x
9 U6 {" l" ~9 s set grid-y-inc world-height / grid-size-y2 V/ z5 F1 ?* ^) h# g9 u9 W* K# l, ?6 m+ |
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 Q- N- I& E Q( w8 j/ S
set acceleration 0.099
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|% Y5 q- U7 y, n5 s% N7 o;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 C( y2 H- A6 P6 w. E
;; and initialize the traffic lights to one setting( B9 o0 v7 B( U5 J7 J* [. J* j
to setup-patches
$ z7 ?1 t0 t. }; S ;; initialize the patch-owned variables and color the patches to a base-color
0 J9 u# r3 S6 ` ask patches* p0 t3 w) f! D+ O. C8 _4 F7 z2 q, Y
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set intersection? false8 W9 N" y/ u) [* p" I) M
set auto? false
+ E: I6 |: s, }2 Z set green-light-up? true% T; L# g! i: l* Q) n
set my-row -18 [$ j8 g! u9 g( \ F6 y
set my-column -1! l1 m* [1 x; ^0 n b# z
set my-phase -1
% {5 E( _" q% N& f$ O% |1 C! k ~ set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
; M! Q0 h" d; O* ]5 j set roads patches with
1 Y& b1 A2 p, q4 b7 C8 s5 X/ X [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 c8 c' d& c1 y% C: F* @ }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 I" R; z0 k t" x8 U set intersections roads with. z# j1 a) F' j. h" x5 l8 g8 u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ U3 Q0 f: O0 g/ n" c3 o5 {1 W
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 \0 v4 R9 y- g: e: A7 m) I
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ask roads [ set pcolor white ]" \8 W1 Q1 ~& x9 b
setup-intersections- ]0 S! b# _' V. A5 H
end2 n4 M4 a9 Y* p/ b& @1 j
其中定义道路的句子,如下所示,是什么意思啊?
" @; q1 h6 p( g9 Q! M set roads patches with: {/ u. q9 v% T$ D3 i: C4 }2 _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 E4 c+ T2 n# W8 O9 L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 B2 I+ A1 i/ F- @6 e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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