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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。9 j3 D5 ^) w% k3 B% z2 W
netlogo自带的social science--traffic grid这一例子当中,9 x$ n5 S4 L5 O. u, g
globals
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' i& a& g9 L# V8 y# s* E1 S7 z4 H grid-x-inc ;; the amount of patches in between two roads in the x direction3 M. R% C1 C+ y6 O7 u- g3 }
grid-y-inc ;; the amount of patches in between two roads in the y direction
: i! j1 G+ P [* X' i acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 G- e( Y8 {8 d& ]$ k* n ;; it is to accelerate or decelerate
2 M: g R. N6 B phase ;; keeps track of the phase
: R; r5 ]% \" W" Y num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
. n5 `6 c! k* w2 W9 c5 ?) Q current-light ;; the currently selected light: d9 k$ G6 D/ L/ a
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;; patch agentsets
' v( \5 T0 W6 ?' W. U4 _ intersections ;; agentset containing the patches that are intersections& E# C; Q$ Y( q# @1 g- E$ @. Y
roads ;; agentset containing the patches that are roads
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" s" P9 W3 u* T# G) |turtles-own; k$ a* Y3 y9 A- i* `* x( m' x
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speed ;; the speed of the turtle
, ]2 d7 S' z5 X* F& g) f; v b/ Y" c up-car? ;; true if the turtle moves downwards and false if it moves to the right
) Q2 ^$ {( Q/ G. Y+ y1 J, }' _ wait-time ;; the amount of time since the last time a turtle has moved( |1 L$ _* X4 T
]
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patches-own
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" o; C$ T+ v7 s) T intersection? ;; true if the patch is at the intersection of two roads
6 _& |8 m0 Z! o/ } L green-light-up? ;; true if the green light is above the intersection. otherwise, false.
, i4 O% N1 K5 n( K* Z; e9 Q* r* G+ u+ { ;; false for a non-intersection patches.
: I5 S6 ~1 a) J6 C my-row ;; the row of the intersection counting from the upper left corner of the
9 y6 K6 D0 J. q: ~ f ;; world. -1 for non-intersection patches.- t( g% b5 l! [) }; D. b" J0 u; r# ~
my-column ;; the column of the intersection counting from the upper left corner of the- q# J7 R" m) T& s
;; world. -1 for non-intersection patches.5 _' d! L: u# [9 a9 N7 J
my-phase ;; the phase for the intersection. -1 for non-intersection patches.3 d. k% b$ c% \, A& {( [" e
auto? ;; whether or not this intersection will switch automatically.* b8 t# X! U' Z5 J+ E
;; false for non-intersection patches.) p% ^+ Y% e0 k
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; I- O: R* R0 `7 Y' E: `3 S' |- ~;;;;;;;;;;;;;;;;;;;;;;3 e2 m, c$ |0 \' s; R; k4 k
;; Setup Procedures ;;/ M, _, S1 l: f; {; |8 G
;;;;;;;;;;;;;;;;;;;;;;: I% D0 \* S" C( g4 }6 w
2 w; ?! L/ {' `;; Initialize the display by giving the global and patch variables initial values.4 u- B- @& K# b- y
;; Create num-cars of turtles if there are enough road patches for one turtle to' l% L7 E4 a+ F. I2 Y) y, e
;; be created per road patch. Set up the plots.* D+ @% t( O$ k4 U
to setup7 S. D' Y) S3 X1 _& R' v0 l- U; z8 c
ca
! P, c* S# ^: f- d: _ setup-globals+ j1 _% \. J4 o3 ~7 F. \
% \4 A( ^* v ~( c ;; First we ask the patches to draw themselves and set up a few variables
5 ]1 j( ^5 B3 W. _& j s setup-patches2 g' h+ G8 m9 ~
make-current one-of intersections6 s- c7 U- j! G( P3 u4 r X# _0 I
label-current
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! @! V4 T. a" n, r: X; M set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
5 U: R. c; K4 f+ j; W3 c "road. Either increase the amount of roads "
3 [0 J: M T5 h1 { "by increasing the GRID-SIZE-X or "
# R( U/ c( g# t4 w3 T# ` j "GRID-SIZE-Y sliders, or decrease the "* J! R1 q5 q, n, I0 S. m6 A( [
"number of cars by lowering the NUMBER slider.\n" E# p4 r$ T% e! R; z0 V/ k
"The setup has stopped.")& X1 l b5 f$ Y' Q \
stop
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: L' n( h& Q1 k" m0 q2 } ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( u4 i1 C- K% J0 N+ I# [/ y crt num-cars8 @0 v1 a" _) J) L- P8 O
[
5 K: e" D( q8 `) b2 e6 o9 a8 k/ t setup-cars
% u Z. W; W6 ?7 i set-car-color
4 u, z1 V- b3 G9 g4 C record-data! z7 s" P0 ~: ]& |9 A
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" C r7 U. v8 Y( j; c l ;; give the turtles an initial speed% x$ E6 s3 g0 g7 ?% P
ask turtles [ set-car-speed ]
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reset-ticks M8 ]3 D; H% b2 h, { G( ~' A7 e
end
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;; Initialize the global variables to appropriate values6 C- G3 ]8 ~* G: m0 T
to setup-globals& l: f; Z3 J+ t; R( f$ i' z. H
set current-light nobody ;; just for now, since there are no lights yet& x- I) k {0 v8 ~$ d
set phase 0* K+ J! s; J0 w. o; i. h6 x. }
set num-cars-stopped 0
7 L H" m$ k* u set grid-x-inc world-width / grid-size-x; |+ c, e* R1 P
set grid-y-inc world-height / grid-size-y# R7 k7 H. V. x( m6 v
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary- H# s3 z: P+ G8 |
set acceleration 0.099) X2 N7 T: n* M$ S: a! K% b
end
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! G( t6 x& O- a$ d6 B5 f. };; Make the patches have appropriate colors, set up the roads and intersections agentsets,- O1 v. u; K, ?7 h6 y; s
;; and initialize the traffic lights to one setting" V7 `% ^; g! [5 z7 G
to setup-patches0 w/ N9 K8 m! ]$ b! t# ~% `
;; initialize the patch-owned variables and color the patches to a base-color; m, d/ k/ p( H! {1 y
ask patches1 J5 N" e; F( p; ~ b2 i+ Y2 T
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set intersection? false& U0 U9 ~4 F! t$ T5 Z& c6 }! q; Z
set auto? false
4 R/ _$ r g: O1 J' @! F a- c) Q set green-light-up? true
B6 v* G) L' k4 r* n4 x set my-row -1
/ U# @8 M7 ~9 V set my-column -1
- a ~3 k0 a5 Z; H3 j2 s set my-phase -1) \2 J: c& C, s& r2 r& u& I8 Y! I
set pcolor brown + 3
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) i! L; C4 ^& ] t9 n7 a! j2 i$ j ;; initialize the global variables that hold patch agentsets
, I# q$ l/ F+ e9 k2 Y. M4 h set roads patches with( M8 t1 j8 J( a; n+ @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# \4 X0 F2 @$ G0 P+ B0 }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 x4 b. {% A6 Q- y6 |. B% j
set intersections roads with
; J2 ?: p4 u6 `6 }4 h [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- q' U6 M, [3 n$ i* U* O
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 C/ j# N- d7 L+ |2 h4 _! o
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ask roads [ set pcolor white ]5 O2 @' G4 D# R6 E( q. N
setup-intersections& s2 m; L' g; E
end
. D$ P) s1 @. L3 \, f% ?其中定义道路的句子,如下所示,是什么意思啊?! |& D7 x) T" X; H. x3 m* {2 \
set roads patches with1 n& E0 E! B5 q' s; E4 t
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) a4 e b Q" r- Z6 d* E
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% u8 l0 z' W% L1 b- N3 e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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