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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。
( I4 M0 X4 b* ?' knetlogo自带的social science--traffic grid这一例子当中,
* I1 H) n/ b* F* @& x1 Mglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction' ?. e( N) H8 j/ ]' j+ O
grid-y-inc ;; the amount of patches in between two roads in the y direction
0 q4 Q6 [; y2 S0 Z1 } i5 t, ^ W acceleration ;; the constant that controls how much a car speeds up or slows down by if
. P9 t9 A6 T; i1 W4 M; ?9 I2 J3 C ;; it is to accelerate or decelerate
: A# h3 D% }2 [, R phase ;; keeps track of the phase
) q" t. @, j: G. t num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( J- m8 x2 O# }' D8 S) D) s
current-light ;; the currently selected light
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1 \& P/ ], c7 _/ p Q; q V! G. a ;; patch agentsets/ n' t2 @# p3 g/ C7 C- X
intersections ;; agentset containing the patches that are intersections4 Y( L8 X# `# |
roads ;; agentset containing the patches that are roads. l( T7 T: V1 T, i! a# _: E
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turtles-own
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7 b& M2 u- H( B- N/ Q speed ;; the speed of the turtle
, G( T9 I, M( {& ^! @ up-car? ;; true if the turtle moves downwards and false if it moves to the right6 c2 n6 f6 S: J+ j5 b3 V6 g
wait-time ;; the amount of time since the last time a turtle has moved0 A4 x7 E/ f' H* e
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads0 }& K" }+ k9 S' b4 C, R: r A# ]
green-light-up? ;; true if the green light is above the intersection. otherwise, false.- y2 n# u* P1 {9 Z) W
;; false for a non-intersection patches.
3 k! e" `' V! S/ |- C! M my-row ;; the row of the intersection counting from the upper left corner of the6 c/ P5 _& b# Q* H. b
;; world. -1 for non-intersection patches.5 r3 B; r+ t$ N6 U$ g
my-column ;; the column of the intersection counting from the upper left corner of the. R& H/ G2 B- f0 G' B% h9 g
;; world. -1 for non-intersection patches.
# z5 E1 v# W2 H1 L1 [6 q my-phase ;; the phase for the intersection. -1 for non-intersection patches.
7 }8 @2 R' ~2 g; ^: X! x0 L5 @ auto? ;; whether or not this intersection will switch automatically.% J! f) p) k* h+ s e* x
;; false for non-intersection patches. ~6 T! s% O9 R$ n) m
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;;;;;;;;;;;;;;;;;;;;;;
% b" d2 h$ l( A8 V( V3 R4 a;; Setup Procedures ;;
$ P1 |' V" s& g A4 x" z/ M;;;;;;;;;;;;;;;;;;;;;;
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& }/ t8 F% `3 o2 J5 V9 V;; Initialize the display by giving the global and patch variables initial values.$ [" j$ D& r4 i9 n
;; Create num-cars of turtles if there are enough road patches for one turtle to
& F2 @' _ d% x0 t8 _# t;; be created per road patch. Set up the plots.) t0 ]: g* P! ?$ [' K! V& x7 D" i5 I
to setup
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setup-globals" _+ U, B3 B& ]
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;; First we ask the patches to draw themselves and set up a few variables
2 z/ N% T: f- f5 @/ P+ p setup-patches
& X: o. d! W' k. w4 m' N2 G make-current one-of intersections
! J. q$ f# t* S ?& A/ E0 O+ E label-current @$ |! t. E6 j# E$ \; u
5 i; {( J+ f6 K4 t" ~$ @. _ set-default-shape turtles "car"
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if (num-cars > count roads)
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5 f* T4 V; k0 I A user-message (word "There are too many cars for the amount of "
9 ]) c. d9 l. l5 _$ v% L3 v; i "road. Either increase the amount of roads "
1 S" O9 l- O. Z+ U "by increasing the GRID-SIZE-X or "
/ c% |4 Y; P1 y5 G& M "GRID-SIZE-Y sliders, or decrease the "
6 t. {7 C6 p4 E8 N( U. W "number of cars by lowering the NUMBER slider.\n"; s+ v. F* C4 J% 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-color
( s2 Y8 t" b" k* |) G2 ` crt num-cars
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setup-cars
! ?9 a' T1 s6 M4 L- y set-car-color
6 F) ^5 \' d( J- H1 z5 [6 K record-data
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;; give the turtles an initial speed5 L( a' l3 B! z3 K& Z- u
ask turtles [ set-car-speed ]& N: R0 [8 z+ G6 G5 ?
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reset-ticks0 ~7 s) p+ A; ~
end2 F! I5 T& Y" C ?
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;; Initialize the global variables to appropriate values
: |- U# \) D9 y; e' tto setup-globals. ^ `% L, y3 t) y, k
set current-light nobody ;; just for now, since there are no lights yet
% z( m! W) O X0 o: z set phase 01 S9 \; ^5 |3 ]1 j1 w7 S) E
set num-cars-stopped 0
5 U7 k$ R O: ?* V& v" r* g set grid-x-inc world-width / grid-size-x5 ~: C% q" Z; J/ g# l2 K
set grid-y-inc world-height / grid-size-y+ e, R+ a+ Y) d, j1 d0 d3 l! D* ]
& T+ A; _5 Z) X ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
% K, u/ `, p! D0 u( `" ?, } set acceleration 0.0999 S3 _0 n" [' I) _$ L4 _
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
) F4 _2 S ]: G& q0 [;; and initialize the traffic lights to one setting8 z1 ]" y# U" y0 b: P
to setup-patches
" c$ F& i- f, r* F- }3 F6 z b ;; initialize the patch-owned variables and color the patches to a base-color5 M0 J6 @ F9 S! Z8 s; O, ~
ask patches
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set intersection? false0 x3 Q$ |4 v0 _1 @
set auto? false J, r, v# I# K+ C) L" [
set green-light-up? true S+ x' P; W) \$ Z9 f8 c
set my-row -1: w3 {6 i$ Y( q0 A
set my-column -1
" U' A& ?$ c9 s: E( T set my-phase -1
% E# B H% m( \! }4 [& e/ h set pcolor brown + 3' ^ U5 i: M8 S A! u% q
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;; initialize the global variables that hold patch agentsets
7 D0 D( i& j" S$ g set roads patches with. j6 I4 r8 [0 @2 B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 Y. i5 U+ b& G/ P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 U9 ?7 O7 @5 q& Y
set intersections roads with
* ?0 M! K% k+ p7 l6 R, A [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 p' Z9 y$ K9 O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- |) c6 C# T: K! q. T3 {# H
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ask roads [ set pcolor white ]* j' z# k0 k5 V6 g* A/ [ d% t; N
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?
/ Q Y: ]2 A* J! ~. D4 e3 e set roads patches with- g5 y% E+ J# O1 i
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 r. ?- c2 ]! S# |! x0 X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], K* v+ t5 J. C& A
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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