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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。
\! [/ W+ G+ P+ C9 ]& o% }- F& u+ ?netlogo自带的social science--traffic grid这一例子当中,
; X1 r* z/ B& l8 g) [9 n2 oglobals
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}; F# R* H: r7 k grid-x-inc ;; the amount of patches in between two roads in the x direction
1 O/ e& M. T* ?5 o. {8 k& j0 z; ~9 U grid-y-inc ;; the amount of patches in between two roads in the y direction
; ~5 w- Q! m6 R$ E" R1 }* v acceleration ;; the constant that controls how much a car speeds up or slows down by if
; O* X5 g. w& M9 a$ ~( m J ;; it is to accelerate or decelerate
( |6 t1 o% K1 V5 U. M' E phase ;; keeps track of the phase, z- J# L; q" w) k, _ z
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure4 y Q8 L+ F$ A1 h9 s$ \
current-light ;; the currently selected light
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;; patch agentsets
, ^8 y" Q; Z' l1 U/ h7 U: Z! a4 V intersections ;; agentset containing the patches that are intersections
: _# b6 }/ Z) A5 O; V$ x3 x, h3 Y roads ;; agentset containing the patches that are roads
9 p- ?0 U4 S7 c0 U9 M], U' Q/ s; s; J: ?
8 d$ B6 e$ M6 a6 d" F# [turtles-own5 L- i2 i' o) ^3 `0 j
[
, f9 f, J$ K- b. w ]! T speed ;; the speed of the turtle9 g/ x( r% K% b) ^
up-car? ;; true if the turtle moves downwards and false if it moves to the right
, f5 p1 c; D9 U% T7 q wait-time ;; the amount of time since the last time a turtle has moved- H- O: `5 `0 |8 a/ D. G* j/ r; `
]
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3 R( F, L2 k% P, ^3 Ppatches-own
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intersection? ;; true if the patch is at the intersection of two roads) n% A; _+ F7 C$ s
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
0 N, T6 j4 h* d$ y2 H: F ;; false for a non-intersection patches." y3 U' o4 N0 U y& l
my-row ;; the row of the intersection counting from the upper left corner of the
+ } J( P* q2 Q7 d- O) Y* b ;; world. -1 for non-intersection patches.. O% N) ?- |0 b. w/ d: ?* r
my-column ;; the column of the intersection counting from the upper left corner of the
5 x+ |" x6 d$ z' y ;; world. -1 for non-intersection patches. c% m5 l8 n8 |! P' D
my-phase ;; the phase for the intersection. -1 for non-intersection patches.) z9 e( e& _8 R& V# }
auto? ;; whether or not this intersection will switch automatically.
1 m( \) ~0 q0 R$ e6 b ;; false for non-intersection patches.
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1 w4 g' L5 S5 f" t* @;;;;;;;;;;;;;;;;;;;;;;- ~1 \. c. b1 j' J) ]; t: p
;; Setup Procedures ;;
& j# u1 o9 X2 e;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
$ E+ k- h* }8 u7 _& ~;; Create num-cars of turtles if there are enough road patches for one turtle to ]' c! t& f( ?' z3 }; b; g
;; be created per road patch. Set up the plots.. Y; q9 ?, D* A% U7 y
to setup7 Q, G- q5 v% a
ca
0 E8 c. E. ~& v, K; V O setup-globals9 T. U: d4 I3 \) x9 ?" f7 q
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;; First we ask the patches to draw themselves and set up a few variables. t S5 r" U% d
setup-patches
& j9 y, z. ^0 e5 R make-current one-of intersections' o) [0 ^4 t5 s) M! N
label-current( h% R8 I. c; d: m* Q: x8 T3 H- ]
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set-default-shape turtles "car"
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$ A1 }7 U1 B7 p8 y, S. K. P if (num-cars > count roads)
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$ S) s5 G' {3 F2 T user-message (word "There are too many cars for the amount of "# f, X. Z! ~' N& N
"road. Either increase the amount of roads "7 Y8 K0 c' B7 w8 _
"by increasing the GRID-SIZE-X or "
, m" { Z! X* [4 J3 r, ^ "GRID-SIZE-Y sliders, or decrease the "
# e$ n5 q: p: Q3 n- O "number of cars by lowering the NUMBER slider.\n" N* z, X. n4 R3 r& |2 O/ f
"The setup has stopped.")
) ~/ z0 ?0 z5 g% c1 [; j5 Y# k, y stop
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) [8 w2 c0 w! X( c! l* E ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 x2 O/ h1 s4 W crt num-cars
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setup-cars7 Q4 t: P" n7 m( Y. Q
set-car-color' n h9 C4 n0 F9 m- W
record-data
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;; give the turtles an initial speed' ^. [! Q3 C9 |& ^, n
ask turtles [ set-car-speed ]5 T: s: v$ ^9 r8 w+ @( P
, g/ n! s$ A/ P, g% o% G8 ~& | reset-ticks. P/ P! [6 K7 a5 r: V; h
end
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;; Initialize the global variables to appropriate values+ o3 m" B0 M1 T& z
to setup-globals9 ?) u# B$ k) K7 C
set current-light nobody ;; just for now, since there are no lights yet8 |. V& O8 V: f, q: K6 W
set phase 0
! t/ i- W# n2 e2 A; ] set num-cars-stopped 0
' Y( p. M) y9 M set grid-x-inc world-width / grid-size-x
, C$ G4 @0 u: j c% b 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 boundary
1 k. `6 C* i+ L+ x7 J set acceleration 0.099
' @+ @+ K; U" C6 r! @1 D9 F3 l% q9 _- cend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. x: N& g& g" B. ^: [; a( L9 e- L- T
;; and initialize the traffic lights to one setting
7 w8 k8 i: `3 R* g0 X, L. Hto setup-patches
5 r- {2 i* Z9 U; x$ E. D* s ;; initialize the patch-owned variables and color the patches to a base-color
9 C1 d% e; s: y; N7 X# e! J7 a6 f ask patches
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set intersection? false9 S5 D+ c6 p9 K* Q" a5 k
set auto? false
5 `* [; i, J7 V set green-light-up? true
5 D+ _/ y0 N& l- M% |4 ]: k set my-row -1: @. I, l+ \* L$ \" U) V: c8 L) p- ~
set my-column -11 Q$ A, Y5 z6 P
set my-phase -1
) K+ j' O5 ]1 O% b( D set pcolor brown + 3
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( x ^) T3 ?4 Z {( h, A8 ?3 R- K' R0 I% X+ }) f3 v
;; initialize the global variables that hold patch agentsets
1 z! c/ {. w' j7 B/ e- Z set roads patches with+ S/ f' ] R8 i# l
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 F- X/ c5 e. L9 o( {0 M7 Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" b$ ]/ k7 Y' N. a' g. z: y9 A+ z& W$ x set intersections roads with9 z3 N* j8 ^# n. y' j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ t! b& X, f/ x4 Z" n: T- N (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 |5 Z: b# A2 J3 \1 T$ Q
/ l; r5 Z: t* @4 |/ S1 q ask roads [ set pcolor white ]
# Y% M8 k! [- `4 Y& ~; I& U setup-intersections
. ] t/ a1 j4 a: b& t1 [end
4 ^7 h4 d# x/ p0 A9 r3 U) o Z其中定义道路的句子,如下所示,是什么意思啊?
3 u5 @1 m5 U% V- X set roads patches with% N9 n. n3 R, y+ J1 V8 W% Y) y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) Q2 N4 z' a9 j% f
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! [3 p6 ^8 d! G3 [9 x4 q
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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