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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。0 Y! i+ l1 Y" \) E% E
netlogo自带的social science--traffic grid这一例子当中, \4 I, O) H3 l5 P; X: {5 M$ m/ y2 r
globals6 v6 p* e L9 |/ E8 I. V1 X
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) H$ f4 L- A6 o2 V grid-x-inc ;; the amount of patches in between two roads in the x direction" t0 \# O" S$ k1 r( c0 X* S( D
grid-y-inc ;; the amount of patches in between two roads in the y direction" Z* h. ^0 w/ k2 U0 \7 L0 O' A
acceleration ;; the constant that controls how much a car speeds up or slows down by if: U7 F& w# s2 H
;; it is to accelerate or decelerate
1 o6 z; o0 u" h% z7 M' [ phase ;; keeps track of the phase
: w8 I4 M* c0 j7 j' t num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
& D' H' j) r$ N* E: I; L current-light ;; the currently selected light: S9 r7 l2 D8 f/ d
* n: _& p# s) Z$ j8 x2 M+ T* }% H9 G ;; patch agentsets: ^9 J. d6 p' Z9 | W/ O
intersections ;; agentset containing the patches that are intersections
: C8 x; N0 T4 U! h. i roads ;; agentset containing the patches that are roads
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turtles-own% J5 Y4 C: m8 D, _- S4 e: x
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- d/ \. C$ I, W* | speed ;; the speed of the turtle# h& J4 h9 I. b/ a# f1 c, u
up-car? ;; true if the turtle moves downwards and false if it moves to the right
. D0 l& O& B/ [8 {0 G4 B wait-time ;; the amount of time since the last time a turtle has moved4 p1 P' C4 }8 z9 Z! r G$ H
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) S: n4 M- q& r* P# M5 T- tpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
! q" [& \: u# Z9 `5 E5 f3 v9 V green-light-up? ;; true if the green light is above the intersection. otherwise, false.
( V2 J5 }/ g9 P# M M4 _ ;; false for a non-intersection patches.
; Q7 ~! Q3 M9 Q# j5 }1 t$ L7 J) E my-row ;; the row of the intersection counting from the upper left corner of the
/ H9 \7 ~6 Z, Q, s8 I ;; world. -1 for non-intersection patches.
5 M& j( a0 L- z3 j- e" o my-column ;; the column of the intersection counting from the upper left corner of the
# r+ R" ]- z. X0 a* s7 p$ \0 Q ;; world. -1 for non-intersection patches.0 Q% V, V9 D- ~! g& y% D4 h
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
w$ ?& m9 X! R y7 } auto? ;; whether or not this intersection will switch automatically.6 @9 ^* ]# w3 h4 ]+ E! k! R
;; false for non-intersection patches.
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2 m: r/ |, U2 A, c;;;;;;;;;;;;;;;;;;;;;;! Z' e# s: g2 m# p
;; Setup Procedures ;;- y2 E7 @! d3 S* m' t2 P" b
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.5 K& ?0 |6 K$ D# q4 E
;; Create num-cars of turtles if there are enough road patches for one turtle to; G0 o8 j6 B `6 O6 H7 V$ p. U" X( U
;; be created per road patch. Set up the plots.% J( d& n! O9 K( _9 l5 ~
to setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables* U6 ?. f% g7 b4 l
setup-patches
: X/ }# r7 v& F/ f" Y( v make-current one-of intersections" ^: e& f( M: \0 G5 l: a
label-current* y" D. [; M: B4 A/ h' C0 t
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set-default-shape turtles "car"; C; O2 h0 B$ s5 d! j7 }% H
- B% w& p) K% H. p; r( G, y1 |% M if (num-cars > count roads)
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& |, l9 x! Y' x2 X) s+ R user-message (word "There are too many cars for the amount of "
' L, S1 K- ~. ^ "road. Either increase the amount of roads "* j* J, B, s) h; V9 d
"by increasing the GRID-SIZE-X or ". g& \% R" }2 E2 Z5 v
"GRID-SIZE-Y sliders, or decrease the ": ?# Z: Z+ h; ?6 ~- q
"number of cars by lowering the NUMBER slider.\n"
& d, y6 K" a T" b "The setup has stopped.")
4 z. l; _! p1 _8 p( R1 ? stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! |* e4 L# z C2 m- q% ~9 k crt num-cars
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: f6 C: T6 F5 t! G" u v R setup-cars
# U* p' l3 l" P9 D* D$ K2 j set-car-color, u" C- x2 q% p6 l4 \
record-data
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;; give the turtles an initial speed% m5 }6 a* u. J# L
ask turtles [ set-car-speed ]
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`% W4 ~+ A2 b6 d/ L7 } reset-ticks$ ^, [# P: a/ F i0 n6 u
end
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;; Initialize the global variables to appropriate values9 u p$ a& k1 _+ \2 G
to setup-globals
/ r. m" B9 j; C* A set current-light nobody ;; just for now, since there are no lights yet
5 T" D% b7 v+ m6 A) q+ k) Z set phase 0* q: F b( \- U- u
set num-cars-stopped 0/ R" {+ G; p; ?$ x7 G2 Z3 d. G
set grid-x-inc world-width / grid-size-x. C' W$ y; K. d9 ]0 b3 ~2 i
set grid-y-inc world-height / grid-size-y6 _; _ h5 k3 G! l8 L; q8 \8 \
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 S- m+ ]- c6 I set acceleration 0.099! v# |% Y, c9 ^' T. }. h; M1 C
end
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0 f, d4 t& [1 w6 u8 r;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: v+ k7 E7 T+ I. O; v
;; and initialize the traffic lights to one setting9 f) \# X; N- v+ Z
to setup-patches3 b* y6 H" [3 Y# @
;; initialize the patch-owned variables and color the patches to a base-color
7 B4 b+ `- s. b4 O0 c0 C ask patches
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6 H, I @7 q1 N; J9 p4 n set intersection? false5 z- ]( B- s( d( `
set auto? false
, D, ?- }% j& j set green-light-up? true: @4 {- j* b0 v+ y' u1 M9 B6 l
set my-row -1
3 L) l# }! S% M" ?: _3 l: n7 Q set my-column -1% _; d1 F% I) q, d3 A6 M0 I- _. A
set my-phase -1
- u5 P6 D9 w( s; A# e set pcolor brown + 3) |# N- V* G1 q0 c0 u5 \5 D% n
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;; initialize the global variables that hold patch agentsets
. ~! ~3 P6 J! N( j& y$ t N' U! P set roads patches with* A# F0 |8 ]$ a+ o; x* [4 |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. S2 N9 ^1 |' e* E
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% ~' u" g+ s5 ?
set intersections roads with3 X, l1 F: {. i% I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 n$ e1 I- }4 L4 Z- V J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]9 Z6 X6 o4 ~0 M: T5 \7 x4 r, ?! V' b
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?
5 Z7 r- |" [; ~- a set roads patches with' @- [7 I, T" v6 M+ F1 {3 x5 m
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. F8 b5 A- G! M; b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 p" ? o3 W0 v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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