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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。
. t+ j3 g9 N8 lnetlogo自带的social science--traffic grid这一例子当中,
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: F+ e7 m, s+ _8 l grid-x-inc ;; the amount of patches in between two roads in the x direction4 @0 I f$ Y$ E* X' p
grid-y-inc ;; the amount of patches in between two roads in the y direction
2 Z9 \/ c9 `% ` acceleration ;; the constant that controls how much a car speeds up or slows down by if5 C1 I, d( q0 C& d) C
;; it is to accelerate or decelerate. K; q* a3 u, {
phase ;; keeps track of the phase
4 D+ e0 Y' Z) S. d0 a5 ] num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( A- N9 n+ k k* T% N- x# _9 l
current-light ;; the currently selected light
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) W$ }: L4 _$ M- o( `# D ;; patch agentsets
& w. q5 \1 i E& N3 R( W; B6 m) g intersections ;; agentset containing the patches that are intersections n" h ~( v6 y) C/ _% U4 B; ?
roads ;; agentset containing the patches that are roads
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turtles-own. K* C" ^: T! @
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speed ;; the speed of the turtle
+ }' c U1 @5 }# @2 N up-car? ;; true if the turtle moves downwards and false if it moves to the right2 w4 r2 x, y- q7 {2 d7 B
wait-time ;; the amount of time since the last time a turtle has moved& L! X$ H( `* t
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7 H, q& K, O9 j& Q1 Z9 Bpatches-own
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$ ~! F; ^% r% {9 v! k, a5 m. j intersection? ;; true if the patch is at the intersection of two roads
7 ?& c9 n4 r b3 l, w, f& G# F green-light-up? ;; true if the green light is above the intersection. otherwise, false.7 a1 ~; h' h% r* V) u
;; false for a non-intersection patches.3 q+ ~! {6 t L" D' k+ A
my-row ;; the row of the intersection counting from the upper left corner of the
3 k1 X! T( g) \/ V ;; world. -1 for non-intersection patches.' ?% t( o3 l) |! E2 V( j
my-column ;; the column of the intersection counting from the upper left corner of the& y8 b% Q' `4 d7 \0 w
;; world. -1 for non-intersection patches./ D. a5 g0 i' s
my-phase ;; the phase for the intersection. -1 for non-intersection patches.7 C2 N e$ | h B7 Z# [
auto? ;; whether or not this intersection will switch automatically.
* P8 j6 g/ R+ T9 y6 m, N ;; false for non-intersection patches.* S- y0 b9 q; s( J# B
]
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;;;;;;;;;;;;;;;;;;;;;;
9 k' c) y. ^3 |;; Setup Procedures ;;( f) h& y P0 ?/ o6 v _; k, o% q6 ]
;;;;;;;;;;;;;;;;;;;;;;6 W* @% G/ A! I7 p
, L3 X' P* H- g, D3 e" a;; Initialize the display by giving the global and patch variables initial values. ~( Y8 [( w+ u$ _5 Z) @8 q0 o2 F. _3 |
;; Create num-cars of turtles if there are enough road patches for one turtle to
3 E& f! _9 a0 Z! X# u& T5 k;; be created per road patch. Set up the plots. C2 J: Q# }; l7 G, E5 ?3 l
to setup; a4 P: @7 _( c. n
ca
7 X$ h! p: c7 v+ V2 O% I2 b setup-globals$ n! G9 _* V4 m0 X; Z
! ]8 g- o/ S1 |* b ;; First we ask the patches to draw themselves and set up a few variables
; M3 Y6 x# i6 ^ setup-patches
3 z4 _# K; v. B4 \( Z$ s. X; d% |! V6 V make-current one-of intersections
9 @( m) ^5 @. j! v( T4 Z, Z4 | label-current
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& K' V/ ~1 h+ \ set-default-shape turtles "car"
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& o! i! F. }* M8 l" v if (num-cars > count roads)
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. T" i5 }, S5 B2 N( y* Y user-message (word "There are too many cars for the amount of ". I6 g* g0 I& p; ?1 x) Z3 x, N2 d
"road. Either increase the amount of roads "
4 V; b4 g- p/ ^9 R6 ?% n4 z5 g "by increasing the GRID-SIZE-X or "
7 V+ Q6 e" }4 Z' J8 T8 p "GRID-SIZE-Y sliders, or decrease the "! N# _9 @/ Q! Q- M6 ]
"number of cars by lowering the NUMBER slider.\n"9 O& N( _) J, m8 B; [
"The setup has stopped.")
% O. A* |. Q- a: g4 b stop
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9 z U2 y0 x# T& Z ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" W* ~: h2 h- X* `
crt num-cars
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setup-cars
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record-data
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) h& n; A* P; }3 E ;; give the turtles an initial speed. W" U0 s6 w. S& k8 F
ask turtles [ set-car-speed ]
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) }' ]6 q7 J s2 e; @2 b. }6 q reset-ticks$ U1 Q. D7 d) Q
end
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# c, W: J6 ~" J' R1 A;; Initialize the global variables to appropriate values3 n2 _- T0 o7 K: M& o9 @* A7 A
to setup-globals
/ O, x& K6 m, V7 p! z set current-light nobody ;; just for now, since there are no lights yet, G! e W& \' L6 k. U' w
set phase 0! o( p3 ~8 i5 `+ k2 j& A
set num-cars-stopped 09 |' x* \- I- n" s! b" k, q
set grid-x-inc world-width / grid-size-x+ [ B0 E' v/ t0 E1 L
set grid-y-inc world-height / grid-size-y
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7 W6 Q2 q2 h4 j, d4 A5 j3 M% Z4 z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
- O! F3 E. P5 S/ b# R; |6 k% j* N: w, y set acceleration 0.099
7 M6 G/ a3 u4 K0 A0 }; r1 Pend( J3 h y J. V O( {+ t" j
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- y# m. ?$ I7 _" I$ o+ U3 A
;; and initialize the traffic lights to one setting* k1 L" U" G1 x# u4 P7 T X
to setup-patches/ Q1 s- N# \! E9 n* Y
;; initialize the patch-owned variables and color the patches to a base-color- R% _ a7 S9 m! G, a' i5 u
ask patches
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set intersection? false
! K- d: ^+ c6 \$ Y, h. {+ a! r set auto? false0 P9 [4 b9 ?4 c2 g* @. u2 ]
set green-light-up? true
4 B& ~/ f/ z8 l set my-row -11 F' b$ b9 q& X/ }% N" U1 C
set my-column -1: H% N2 F/ Y6 E# a
set my-phase -1
) R0 O) F! {) w; o set pcolor brown + 3
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9 L+ N* P; ^: o7 o ;; initialize the global variables that hold patch agentsets+ l& j1 _9 F3 K
set roads patches with
9 R* r' O) |% j6 s [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: l: t9 k) o: A6 o5 [3 }( |; s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 N+ G, E y! e. f; s7 y+ k
set intersections roads with
, a" f) D4 f/ n" Q$ u& |1 e [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and( M! j0 J7 ?% l9 s: g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- P; \: ]3 j$ c0 ]/ R
: Y" J7 D/ r6 {! v- G2 P7 R$ L ask roads [ set pcolor white ]" N' Z0 a* G# }8 {; F
setup-intersections( |. G1 T* L) V5 h$ m# ]
end
4 d e% l4 n, f其中定义道路的句子,如下所示,是什么意思啊? `( Y w6 j# m t& L0 Q" e* b! ?
set roads patches with2 M" v% ?# M1 W) o4 a% c2 m
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& Z1 G7 V9 G f" t; n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, O k- M! M% b. Q, N3 `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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