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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。
. E+ c2 [/ t9 j) i! r0 gnetlogo自带的social science--traffic grid这一例子当中,2 _- L) A+ R7 r: \# k
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction$ q1 s0 H7 L, F2 n7 ^2 e/ Q1 W
grid-y-inc ;; the amount of patches in between two roads in the y direction
4 r1 _8 v) G/ T acceleration ;; the constant that controls how much a car speeds up or slows down by if
3 ~0 e5 U, w0 ` ;; it is to accelerate or decelerate' y! q# t6 f0 d9 y
phase ;; keeps track of the phase
: o& c5 Q+ J/ ~8 z9 C- v. D num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
8 R( g9 w$ Y1 f+ u/ F current-light ;; the currently selected light
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;; patch agentsets$ r& n# p" B* z. z" D! k. v
intersections ;; agentset containing the patches that are intersections) A" R! }; R, X' J: B
roads ;; agentset containing the patches that are roads
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9 R* a1 B" e# B+ t% L' c8 bturtles-own
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speed ;; the speed of the turtle v/ L' z8 e1 B' J6 g- D7 g( D+ x
up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ h/ g/ m& T: k! j0 x8 s/ G5 I, A+ g wait-time ;; the amount of time since the last time a turtle has moved
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patches-own0 ^' z1 Q2 }: D" w
[
1 ^+ B9 U% n6 d/ j6 p \/ T& y intersection? ;; true if the patch is at the intersection of two roads1 ^0 P* @; G0 y4 u
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' H' d, D( z* _8 _, C ;; false for a non-intersection patches.
6 D" C& n1 A% h% b my-row ;; the row of the intersection counting from the upper left corner of the3 ?4 t% q! ]. Y. Z& Z* u! @( H- \
;; world. -1 for non-intersection patches.
{' J5 M" [1 ^5 } my-column ;; the column of the intersection counting from the upper left corner of the! @! ]' `" w1 f7 T
;; world. -1 for non-intersection patches.
! z3 V+ ~( p$ J; S4 ?/ v my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! D2 J5 K6 P G) i2 y auto? ;; whether or not this intersection will switch automatically., r5 a: p( _3 h8 J$ s0 r
;; false for non-intersection patches.9 n2 r1 R3 P; j: T1 }
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6 j& E5 f: e9 d8 s;;;;;;;;;;;;;;;;;;;;;;6 g. k1 V4 z; N; C2 d3 K+ W; d
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.) ^; {6 a1 o2 I3 i3 Q
;; Create num-cars of turtles if there are enough road patches for one turtle to, `- q; b8 j1 z3 b$ D8 b
;; be created per road patch. Set up the plots.- |) j, U9 U/ Y# J
to setup
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setup-globals
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, q* j! W6 y/ ^9 [9 I; v1 P5 `5 B% h ;; First we ask the patches to draw themselves and set up a few variables
) A5 a2 ?0 {+ c5 ~ setup-patches" M7 F, P2 Z, p0 {3 ?
make-current one-of intersections3 g- P% V3 @: n3 p
label-current6 T; E% O; U+ f7 b
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set-default-shape turtles "car"8 a, M/ s8 s" C( ^) U! x! n
8 q- b C! w1 o# ?. W if (num-cars > count roads)7 V6 P- J0 m6 z. [2 \
[
9 M: z V2 G1 h; W- d$ c user-message (word "There are too many cars for the amount of "
( P! x2 N; Y2 W% [, a: k) m "road. Either increase the amount of roads "( [; X( F5 W" e" I; w! ?
"by increasing the GRID-SIZE-X or " R& I: @ |. d$ T* o
"GRID-SIZE-Y sliders, or decrease the "
, X h8 Z1 m* P "number of cars by lowering the NUMBER slider.\n". T* |$ C0 Z; X, R9 z
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 e9 S) N9 j* w" g& d+ v; }
crt num-cars
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set-car-color0 {+ C' }9 a8 a3 g8 i2 ~
record-data7 j! b% ]+ R' N0 \! k1 F+ y
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$ t6 u ^9 [" b ;; give the turtles an initial speed
% |% s3 |* c% y. J. x ask turtles [ set-car-speed ]+ T6 T) R9 y+ \8 K2 \
/ P1 ~- f; ~6 G' D$ ^$ x7 D$ W. K reset-ticks c* ]. [: Q W8 f# U& L
end' m, \5 ^; q& j# N, i
" b4 I- i# x: i# R! w* ]' L;; Initialize the global variables to appropriate values- v# c6 B+ {/ d2 a( J
to setup-globals9 c1 X5 v# g0 C9 k* A
set current-light nobody ;; just for now, since there are no lights yet( A1 X- d0 R3 x. S5 t0 s' }
set phase 0
3 l& E" _! b [ set num-cars-stopped 0* z; u/ S; V$ f8 o9 \' X# e
set grid-x-inc world-width / grid-size-x
3 T: _4 x. _$ j( c2 T9 n& ~$ f set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 ~' U0 m4 g7 f$ M2 v/ N
set acceleration 0.099
4 N: M+ h' m8 J' k M1 f* z& _end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; G* I+ z( t% F& c; |3 I/ a;; and initialize the traffic lights to one setting
# r C/ K6 O8 H+ I: H! Uto setup-patches
: Z; B# \6 \& f$ m7 @( x- s% { ;; initialize the patch-owned variables and color the patches to a base-color
; p! C5 L# F2 A7 S Q+ k% M; Y+ A ask patches! W( w* ^! W+ S8 j, y" C
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set intersection? false
/ l2 C2 F1 \ Q" P; N; | set auto? false$ B6 u+ A, ~+ \
set green-light-up? true
+ j* j6 r! i& x( W" K7 K- s) ~ set my-row -16 L0 B% W/ M* j' m
set my-column -1- m' J8 W- n$ q0 \
set my-phase -1) ]3 t9 X6 O% E4 X: B
set pcolor brown + 35 B* w% k, D7 K( n& r' P: y: ~
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;; initialize the global variables that hold patch agentsets
# I8 q& Z' l) J5 u3 ^' R. Y set roads patches with) y0 V! z6 q: o/ G- x& W
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( h" c5 C: L; C3 x5 Q! v) O
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], {- D6 S& Q' m% E/ L
set intersections roads with" y7 [ a* D5 ]; ?, b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and Y/ g: J( V: j9 |, G/ N' N3 _! u8 x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]7 j6 h# P" i; Y# q0 n
setup-intersections2 a( B8 O. Z5 P! U, B5 F. o
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其中定义道路的句子,如下所示,是什么意思啊?; A5 k2 z& X$ m' l
set roads patches with* y4 t0 Z! ]. ?1 U$ h& u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- s0 {. {9 Z6 p+ i: [5 V: F+ ~6 R
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 p ]( B; J% k8 _' C8 l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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