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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。
4 l9 [9 F+ T1 {0 X4 cnetlogo自带的social science--traffic grid这一例子当中, G7 G) i8 ?- t: v
globals
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4 R9 O+ a4 N! U' w" ?' G grid-x-inc ;; the amount of patches in between two roads in the x direction
7 p: V; ~) R# A: S' p9 w d grid-y-inc ;; the amount of patches in between two roads in the y direction* A5 H$ M w1 f7 n: p6 U1 G7 j
acceleration ;; the constant that controls how much a car speeds up or slows down by if
. M# {) l2 p* p) @& ^2 ?) ? ;; it is to accelerate or decelerate
" k" c8 b) B7 t% s( H7 e5 P# g phase ;; keeps track of the phase
3 u7 i' A5 e7 [ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure* M# A, q# @/ ?0 B* _+ ^6 d
current-light ;; the currently selected light
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( z& z: g! V: M- o/ d! r, q ;; patch agentsets
8 A: o! k- p2 ~( {5 f intersections ;; agentset containing the patches that are intersections
1 z; A6 j( |' K& P8 d2 @ roads ;; agentset containing the patches that are roads
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4 ?/ D O% @$ ?* l/ P6 fturtles-own9 B" G* v2 f$ n- g/ i0 b
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speed ;; the speed of the turtle, r1 i" { n# l7 c
up-car? ;; true if the turtle moves downwards and false if it moves to the right& u7 a4 {/ M; J) L) U' ~
wait-time ;; the amount of time since the last time a turtle has moved
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( o. i; K8 k; F# ~" dpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
% C, R6 D( H5 F' v& ^ green-light-up? ;; true if the green light is above the intersection. otherwise, false.2 D3 P' S% k, O8 \3 ^/ p% u
;; false for a non-intersection patches.
! h5 }( ?. O" n! d3 C) c my-row ;; the row of the intersection counting from the upper left corner of the. I. L2 P2 W5 f/ h! `2 g2 g
;; world. -1 for non-intersection patches.
: T! Z% ]2 O2 g; @" E/ l$ \ my-column ;; the column of the intersection counting from the upper left corner of the3 K2 A4 Z+ a4 E
;; world. -1 for non-intersection patches.
! C. m/ v* k) V9 v; b% Q my-phase ;; the phase for the intersection. -1 for non-intersection patches." F. {( p$ s9 L. k
auto? ;; whether or not this intersection will switch automatically.% H% o% {" p4 [/ T1 g4 y
;; false for non-intersection patches.2 p$ W) q7 S& l' K% F# J" B) C
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) s% q m# @6 q7 E) K4 U% H! x, n# m;;;;;;;;;;;;;;;;;;;;;;
; x& x1 `! Q* F+ |" O' r* _. A;; Setup Procedures ;;5 V' z% b% m, y6 n g
;;;;;;;;;;;;;;;;;;;;;;
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7 K2 z0 D1 x, r: h;; Initialize the display by giving the global and patch variables initial values.! q8 ]. e' U7 o
;; Create num-cars of turtles if there are enough road patches for one turtle to& m8 z* z, t/ a
;; be created per road patch. Set up the plots.
& I, k, l/ |5 P) B2 }' B6 Yto setup! Y3 u! g+ V7 U8 |5 e( `
ca
6 Y% P) M: @2 X, P1 J- S setup-globals" b l$ [* L( e9 U. u
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;; First we ask the patches to draw themselves and set up a few variables
4 N5 R x! p8 z1 K# P setup-patches7 T/ `9 S) \% P2 [7 L/ x
make-current one-of intersections7 \, j3 i, N. ]. A
label-current
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set-default-shape turtles "car"% P+ ~# h. z, V- S. k8 D
3 \: x8 @! C* ^/ Z# B' q if (num-cars > count roads)7 o M8 `8 W# t& i2 ?$ z
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user-message (word "There are too many cars for the amount of "
5 D1 N% a' U& j8 I1 q1 A b "road. Either increase the amount of roads "2 n' x. A% t: P
"by increasing the GRID-SIZE-X or "
& r/ `9 M2 |4 F+ F9 y3 { "GRID-SIZE-Y sliders, or decrease the "" [- E2 k) i$ Y
"number of cars by lowering the NUMBER slider.\n"
" I4 G6 H; R+ }6 C+ l "The setup has stopped.")
' Q) t$ W7 _7 [4 g: o$ [$ u- o stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
0 r9 r$ ~/ h+ r }% E' E% n crt num-cars0 `& V( S7 D1 Z# W' R
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setup-cars5 J1 g9 a! c4 C# \. |3 @0 y: G
set-car-color
I3 H2 r: b! c# \+ k% v5 |+ ` record-data
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;; give the turtles an initial speed
; ` g- c/ _0 A, C* O4 c$ ~ ask turtles [ set-car-speed ]/ n, m+ W) p. c: y/ O* u# X
9 I! ?" D @/ l reset-ticks4 h" e( X5 ]( j7 n, t
end) k3 d. N5 ?: p4 g; Q+ ^( n, L
) ?1 N/ G7 R0 ^/ D7 _* q W;; Initialize the global variables to appropriate values: [- m# l2 s. O: t6 @9 n
to setup-globals
U/ `8 ]- Z. d- [# D/ t9 \3 L. U set current-light nobody ;; just for now, since there are no lights yet( F% y7 g0 J# S. b9 _& ~
set phase 00 B; Z8 v: S. ]* w. Q
set num-cars-stopped 0
& H4 g8 x! r# b, w% ?, Z set grid-x-inc world-width / grid-size-x ]; M5 C' {7 R3 p' R% J2 m
set grid-y-inc world-height / grid-size-y* R5 X) f, ?' y4 I) I% N
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) l/ e6 m! ~2 H set acceleration 0.099% ~2 I2 w* Z$ w* B4 }
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 J, J1 O4 Z0 h
;; and initialize the traffic lights to one setting
4 B- f" V5 i3 z/ Nto setup-patches
( q, ]. U/ a: J& D ;; initialize the patch-owned variables and color the patches to a base-color+ C7 a5 [( o3 D9 I
ask patches( H5 ?7 M& V6 [. p6 t+ L
[
5 ~: ~1 G+ D$ F! U' D: y) W set intersection? false
% C9 A3 w8 ^- h/ x1 s+ L) L2 H6 { set auto? false
1 a6 A" d: j1 }. y' L3 _) I1 ?1 s set green-light-up? true
; m& l* i" F: C! q6 [8 A. o6 e+ k set my-row -1; \2 z( Z' }% ]' Y# x9 ^
set my-column -1) n9 i: a: }' G1 c2 K. z* S
set my-phase -1" b: V+ S% o: Q
set pcolor brown + 30 E% A+ N5 z/ g5 W0 p
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( [" R% r6 C6 l5 H$ M* \' R ;; initialize the global variables that hold patch agentsets9 q2 f" f% q h7 ]
set roads patches with; }! e ~* D7 r1 ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' R( J# B3 e, }* _% g5 E (floor((pycor + max-pycor) mod grid-y-inc) = 0)], q% V# Z# `* U- }7 {+ h
set intersections roads with
0 R" \% \7 q) T$ J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) n0 X0 N! c+ X# W: q5 M! i- h3 r. x (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 `. h0 [" ^9 q1 r. \. ?4 H
( f' e; z5 S: W" i( Q1 o% R* ] ask roads [ set pcolor white ]. v/ C6 l2 ]) I u, Z
setup-intersections" M9 W- R0 q1 y3 |! K! R% a
end
6 o! u% [6 \( `! w) |. z其中定义道路的句子,如下所示,是什么意思啊?
; ]$ u- X7 U6 m: m5 \+ y set roads patches with1 Q9 M7 y( P2 T$ l( }/ J$ b9 j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, |6 C& a) m5 T% T7 v% R7 v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% M. j3 |% ?9 x6 }/ {! O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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