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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。
# _; ]+ K9 q: f5 f% [2 Mnetlogo自带的social science--traffic grid这一例子当中,( ?# Z+ Q2 y- p/ L) W# w/ D* \
globals* q1 J; U A9 |, K8 Q3 `
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4 t% |- y+ {4 @. W% I, G grid-x-inc ;; the amount of patches in between two roads in the x direction8 Y4 n7 u# q( f7 Y/ c% O. d
grid-y-inc ;; the amount of patches in between two roads in the y direction; S, ]' N. r* V
acceleration ;; the constant that controls how much a car speeds up or slows down by if
" r0 l6 O6 x" ^) M9 q [ ;; it is to accelerate or decelerate
7 E9 L( o3 P V# e% T1 [ phase ;; keeps track of the phase9 E7 E! x8 x! X2 S0 ~% B) a
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% Y5 B9 U( g8 B
current-light ;; the currently selected light
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;; patch agentsets) ?, A1 r+ w b/ s% y
intersections ;; agentset containing the patches that are intersections
$ v5 Y5 W$ Q) d% R3 Y. A roads ;; agentset containing the patches that are roads- ]( U- H0 v$ D5 v- v, U
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turtles-own
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" f$ T. U z* {7 x; E* z" d speed ;; the speed of the turtle* A, [" P, J; E. M; Y' Y# l' @) y
up-car? ;; true if the turtle moves downwards and false if it moves to the right! S) B* m9 f% k3 A
wait-time ;; the amount of time since the last time a turtle has moved
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2 @* O2 r8 a$ O( ]- k) ?2 ~, z ^patches-own
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- s0 ?. Z4 b$ h; p intersection? ;; true if the patch is at the intersection of two roads' C. _4 V7 ^- O! _4 k9 N
green-light-up? ;; true if the green light is above the intersection. otherwise, false.( V1 t# v! v$ T: y% V
;; false for a non-intersection patches.1 `9 n5 c. V( G- X* X I
my-row ;; the row of the intersection counting from the upper left corner of the
4 W; r$ k: L+ U ;; world. -1 for non-intersection patches.
) M' w" j+ T2 H7 s+ |' v& @& o4 @" N my-column ;; the column of the intersection counting from the upper left corner of the
2 h- I9 [$ f A) j- A& l$ p1 W ;; world. -1 for non-intersection patches.! n4 D5 R6 C/ U; p/ b
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
* I& c/ q: ^; F2 S% C. l3 F) f auto? ;; whether or not this intersection will switch automatically. Q& l1 F/ V& h1 |/ d
;; false for non-intersection patches.9 ^2 _* M6 Z8 s9 ~1 T
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/ Z7 d6 z; `! z! E;;;;;;;;;;;;;;;;;;;;;;
8 o; ]# @3 z" J; `: u% `9 M9 K) @;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
2 e& ~* A) ?0 ?* p9 {: Y; S: c) N;; Create num-cars of turtles if there are enough road patches for one turtle to
7 `8 ]6 L3 Y* N6 U;; be created per road patch. Set up the plots.
+ ]( o% \& H' K2 ?. Qto setup
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, {4 x' W, m: X& a1 u# x setup-globals( I. Q1 Z6 ~- a$ T2 L- g
" w, t5 R" E- }+ \ ;; First we ask the patches to draw themselves and set up a few variables; ~0 p8 g* _( s
setup-patches
3 ]1 \2 B# J. \ make-current one-of intersections
! M$ A6 I* \: ?+ d* Q0 G) \ label-current* i6 Z$ z: M" l: J5 @) |/ d( P
# f5 l6 j, C% }% T1 v7 W4 C2 J set-default-shape turtles "car"
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if (num-cars > count roads)
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+ _) l- e' H) ` user-message (word "There are too many cars for the amount of "" F/ j+ J- p2 }' l; V5 e
"road. Either increase the amount of roads "+ s3 o$ P! j: ^6 b! Q" Q1 p
"by increasing the GRID-SIZE-X or "1 }5 X* g# M) f( v8 M! r7 f
"GRID-SIZE-Y sliders, or decrease the "
7 f+ }' L2 t* C( \7 y, h "number of cars by lowering the NUMBER slider.\n"& r- V1 H8 C* {
"The setup has stopped.")6 K9 H8 ~- D1 @- L. D! c8 D
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 m: L5 e4 `& g" G) X( D
crt num-cars
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. _) \/ ^, ?7 \! }# z( w setup-cars; s0 }, w; L( O, S$ G
set-car-color- h9 a$ J" P0 v) F& W9 e0 S% h! Z3 |5 Z
record-data; m, x; a$ I7 W% s; Z/ T
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;; give the turtles an initial speed
9 |. [0 t8 m+ ?; a) F ask turtles [ set-car-speed ]% T. q) Z- Y1 l
% b9 a1 V4 M3 z6 M" W9 b reset-ticks/ @( g8 z1 c: [' o# _# o& Z
end: h1 ~- n1 W. Q& d
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;; Initialize the global variables to appropriate values! l4 h7 [0 {3 Y) Q. @. g
to setup-globals/ e1 p8 v9 m* H( I+ l( b% m
set current-light nobody ;; just for now, since there are no lights yet
) n# Q7 t0 |$ u: w4 B- p5 ? set phase 0, C7 n! C9 S& A( y' E8 S! M
set num-cars-stopped 0
, c$ v, a+ Q! K# z V6 \, _* h) x set grid-x-inc world-width / grid-size-x
+ L3 C1 h& z/ v- F" P; k 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
" B( I4 k; K* C* e5 @ d set acceleration 0.0991 V- A1 a$ z( S
end
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3 |. K+ c5 f' z0 p: H' e r;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 I# n4 `, F8 R F( Z) m4 P/ C" ~;; and initialize the traffic lights to one setting
! g( i1 ~6 o; V' Jto setup-patches; f+ O' L( d3 o
;; initialize the patch-owned variables and color the patches to a base-color
( L# v8 l3 y. E+ r: t# W+ Z- g ask patches! Z. q- c. H; F+ \. E/ D, F
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9 {. d* r. c& t+ a0 Z) v set intersection? false
! E. Q& a3 z4 w7 T, ?& m set auto? false
( l, S! }4 E- i- c/ | set green-light-up? true
; _7 ]$ q& s; S% i set my-row -1
5 [- ]; V( ]0 P+ { set my-column -1
! J$ q7 N" I2 U. z( j set my-phase -1. a9 R: ^7 D' T& U5 I8 s7 H' z" X& B
set pcolor brown + 3
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! ], `8 H4 ]- m" G4 k. y3 c ;; initialize the global variables that hold patch agentsets
; o" n! H" V$ f" o; q/ x! \, C' f set roads patches with4 R2 f) [+ l% w8 A* W9 k$ C" c: H4 t5 j9 ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 h2 S; ?2 H1 n0 j D3 G) z2 ]
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ `6 h: m/ V$ ~ set intersections roads with
1 y5 Y7 _# Z8 ^- Z% i" \$ \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* K, D6 e; G' `/ @/ z2 m- x/ N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
2 g0 G! |% Z! W J* S; c5 f setup-intersections
. r$ ?/ u& M7 ~% } O; r$ jend
/ x# q% ?2 D% s6 c' |( r* u其中定义道路的句子,如下所示,是什么意思啊?$ O P, f# _3 Z$ m$ K- ]+ ^5 a s6 G& ~
set roads patches with
+ E$ I6 n' Q1 m0 F0 S4 T- r( P+ O [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 [+ Q6 j6 l1 j ]
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; Q2 X" y+ J+ G% f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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