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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。
" F1 a% u ^$ t6 `% S9 @6 r/ |8 T" Y7 nnetlogo自带的social science--traffic grid这一例子当中,
( ?1 G6 w- s5 m; d1 A. v- yglobals; ]* J& _# a& r8 [* X) U3 a( D. G
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grid-x-inc ;; the amount of patches in between two roads in the x direction! P9 t; Q# }. q$ R' z
grid-y-inc ;; the amount of patches in between two roads in the y direction2 D$ C6 c3 _' r3 z+ G) D
acceleration ;; the constant that controls how much a car speeds up or slows down by if0 G- m3 v9 V3 V8 U3 ^2 O
;; it is to accelerate or decelerate! O' v2 ]8 _- p" U0 ?. I9 X; s3 s
phase ;; keeps track of the phase' x: S! _! }9 I' P P; P3 m5 M
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure' S* b. z( Y- G& w" e( c2 N
current-light ;; the currently selected light4 H6 P/ w9 A9 r2 j( X
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;; patch agentsets
4 ]3 r( p9 [2 x2 V) G intersections ;; agentset containing the patches that are intersections
$ L% b2 [& U$ c' w roads ;; agentset containing the patches that are roads
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* {" o1 c0 ?) H7 v0 wturtles-own
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speed ;; the speed of the turtle; Z: N4 q$ i }4 X0 L
up-car? ;; true if the turtle moves downwards and false if it moves to the right
6 }9 h" o! e, v9 ]0 K- h) ^' N9 N wait-time ;; the amount of time since the last time a turtle has moved
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patches-own6 |! {4 x2 j6 X; E( ]
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intersection? ;; true if the patch is at the intersection of two roads. }0 o- a- c8 S7 u
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
0 ]% u3 _. C4 p( e" ^6 k ;; false for a non-intersection patches.
# L7 G8 b' X$ e& w9 |4 v" _: s my-row ;; the row of the intersection counting from the upper left corner of the4 ?# B* z& p! i+ p# u
;; world. -1 for non-intersection patches.
" l1 x4 y% r3 h my-column ;; the column of the intersection counting from the upper left corner of the
) v% ^. r. B/ _" R% C ;; world. -1 for non-intersection patches.; i: g2 a5 m9 l! H3 b8 p) t
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
7 y, `8 c8 ?5 T M8 A2 O auto? ;; whether or not this intersection will switch automatically." q0 o) [! n& K; q
;; false for non-intersection patches.9 W9 \0 s( M* g* [
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;;;;;;;;;;;;;;;;;;;;;;
( K* a$ \# S1 r; T0 a2 w1 m;; Setup Procedures ;;5 y9 }" `' L% W$ L' x! O' o; F d) P
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;; Initialize the display by giving the global and patch variables initial values.# a. E# {; G" A, {2 L+ _3 Q' Q
;; Create num-cars of turtles if there are enough road patches for one turtle to
- K, i J9 e" P; r3 P, P;; be created per road patch. Set up the plots.1 |" ~. P E4 l2 W
to setup
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setup-globals
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0 \0 o! k- b3 I& J! [ ;; First we ask the patches to draw themselves and set up a few variables
( G- a; V, Y$ P( o5 L0 N+ s2 C5 V setup-patches9 a6 v. z' W* @- f4 j
make-current one-of intersections
; d+ `: H' g2 P- i: K3 P& H6 e1 D label-current
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set-default-shape turtles "car") l/ \, j p \; `3 _
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if (num-cars > count roads)& |1 z) @' q6 N- a( F
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user-message (word "There are too many cars for the amount of ") s" g5 t- C. }. p! ~
"road. Either increase the amount of roads "
# N, T) N1 p& l$ m6 x "by increasing the GRID-SIZE-X or "
3 l3 ?- [& `0 f1 m5 s "GRID-SIZE-Y sliders, or decrease the "8 x2 @* k7 N5 H6 ]" K+ ], ?
"number of cars by lowering the NUMBER slider.\n"
6 d5 o! I0 D3 X' u "The setup has stopped.")
+ U; K; i1 Q0 u stop
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( ~/ Z+ e8 q2 i+ c; E; j ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 x! K) m; @/ C" ?% V: j% n crt num-cars
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" x, I: d$ T0 H+ Q+ }0 C; \8 l setup-cars
( M( E: z! X* e set-car-color4 l8 j; F e5 E& I- T+ I" `
record-data
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, l9 s1 M6 J* H l. E. T" U ;; give the turtles an initial speed
2 Y5 X D7 l+ \8 x, U, @, W ask turtles [ set-car-speed ]
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; X6 E W" q$ j3 w4 W reset-ticks
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;; Initialize the global variables to appropriate values/ V# O2 A! B, u7 a
to setup-globals& n& o" H, m8 m1 |- Y; ~
set current-light nobody ;; just for now, since there are no lights yet |6 Z) O9 |0 d$ ^0 l
set phase 0& `) u9 K, B0 C6 V
set num-cars-stopped 02 a0 }: D0 L( H! E0 a8 g7 C1 j
set grid-x-inc world-width / grid-size-x I% \4 m6 }- i1 a7 c, G- x
set grid-y-inc world-height / grid-size-y
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+ }, J# i5 f1 {" Q ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! H! _7 `+ X1 ?$ z set acceleration 0.0991 B2 i4 d) p! |8 y* A
end3 X; n% k6 a- F5 v
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# k# |* {9 V; P8 I: }
;; and initialize the traffic lights to one setting
! a# P* Z. W9 y5 x% c6 q* T! sto setup-patches
4 B* f2 }6 L5 \2 V- Q0 { ;; initialize the patch-owned variables and color the patches to a base-color
8 t7 I9 X* E7 ?5 [8 b" H, g1 t6 @ ask patches D, I" ~$ y) N% m
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set intersection? false' B2 I! o' j0 e) y/ h
set auto? false
9 t$ j2 C2 k3 }) e3 b/ o. S set green-light-up? true
: m; f: u; s* r; q% r/ T. V set my-row -11 Y% ]" I' T0 y7 K- I
set my-column -1( d* S" u& E7 y2 \ c2 g6 y$ _
set my-phase -15 f4 a6 f. N& r, c8 P y* j
set pcolor brown + 3* [) f! U0 j2 n% u
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;; initialize the global variables that hold patch agentsets
0 g$ x: L& M9 d+ `1 o+ V7 ^4 z* V set roads patches with
, s- s% j2 |. F. { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 e& L; h0 A5 O$ t: W( Z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% Z$ O1 C2 A6 i, @" F: N
set intersections roads with
! c8 Z! m+ [. a5 [3 J5 I+ O5 N5 n [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. |" f8 s. l) ^: Y: H# s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 T, \! {% e& y5 X! a$ w
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ask roads [ set pcolor white ]
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: w+ Y+ U/ m/ U4 m, D+ [其中定义道路的句子,如下所示,是什么意思啊?
3 c( B0 x6 ]; u* u' K& \ set roads patches with
7 w7 G; X; _5 ^ D s5 L: e4 } [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% w% D' a) {! W, L, X' p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% ~3 c, d+ k+ J8 c: L$ s
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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