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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。
$ S1 a6 V" p! W" q5 Vnetlogo自带的social science--traffic grid这一例子当中,: H! c6 |! N+ h" x
globals; M( c( D! a9 P6 j& P: {3 Z- z% R
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grid-x-inc ;; the amount of patches in between two roads in the x direction
6 \7 l# b7 z/ D grid-y-inc ;; the amount of patches in between two roads in the y direction
8 `( X# Y+ B: w! |) [& Y5 S( a acceleration ;; the constant that controls how much a car speeds up or slows down by if. b9 l% F0 a, F2 M" |) D. f
;; it is to accelerate or decelerate- I3 o) C( r/ w) S9 y' Q3 ?$ ]
phase ;; keeps track of the phase' S. ~7 y' x8 e! s0 s! Z' i, e
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure! u. x- O8 A4 {1 {3 S- L4 k
current-light ;; the currently selected light
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% N O1 M4 R2 h9 W* i0 q/ _ ;; patch agentsets) ?$ F0 C- m* G
intersections ;; agentset containing the patches that are intersections
8 k7 W2 E% \5 { roads ;; agentset containing the patches that are roads0 x, Q4 u9 v' I5 f
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% D% s/ `# [3 z; V/ N* {/ Oturtles-own0 y4 ~4 u! q: e
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speed ;; the speed of the turtle0 C+ d, A0 G6 I2 V& l* r8 N" f. B
up-car? ;; true if the turtle moves downwards and false if it moves to the right
5 v. J5 D5 u y8 P wait-time ;; the amount of time since the last time a turtle has moved* g+ x: I9 h/ G! P. P
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0 @# @$ X4 _/ `1 D: Cpatches-own9 P6 {" @) C8 R: b3 M- s
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intersection? ;; true if the patch is at the intersection of two roads: ~8 W' V r! J& b
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' e3 [3 l. ~, r* W, F ;; false for a non-intersection patches.* \; t. o0 j J
my-row ;; the row of the intersection counting from the upper left corner of the
( x1 c8 f+ ~7 X ;; world. -1 for non-intersection patches.
6 ^8 Z0 x4 k# f- t8 ?3 k my-column ;; the column of the intersection counting from the upper left corner of the
5 w l: E; {# b8 g9 H6 f ;; world. -1 for non-intersection patches. b% b$ p. e5 p7 M
my-phase ;; the phase for the intersection. -1 for non-intersection patches.9 e3 Z& r9 u4 V. V% R d
auto? ;; whether or not this intersection will switch automatically.( P& }$ t* r8 t
;; false for non-intersection patches.5 a7 W$ \0 e. q# o& X6 o/ Z
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;;;;;;;;;;;;;;;;;;;;;;8 R! [0 W2 T+ m* r: q
;; Setup Procedures ;;! j. R) G) e( Q# ]
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;; Initialize the display by giving the global and patch variables initial values.
. C5 L) {/ V: s( };; Create num-cars of turtles if there are enough road patches for one turtle to
* [. b, M( t n( O3 D9 E. } @2 Q;; be created per road patch. Set up the plots.
$ w$ Y, D4 N* D P5 Xto setup
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& O. z7 ^# D+ Q2 x setup-globals9 y6 W0 {: K# p( Y5 e. {5 G
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;; First we ask the patches to draw themselves and set up a few variables! Z) B" c- ]3 X
setup-patches
- g% s: V! x0 c make-current one-of intersections8 s. d# c7 B& n" T3 a! H! ~+ b
label-current
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& ] S% [; M$ U% w set-default-shape turtles "car"
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; |$ F2 m2 g6 l6 T if (num-cars > count roads)& A- t& V1 e" S9 ]
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user-message (word "There are too many cars for the amount of "
$ x$ t% J$ v6 @' G. s2 R g# | "road. Either increase the amount of roads "
1 r) x2 ^& B) G# @! [; o" B; r1 k "by increasing the GRID-SIZE-X or "
+ |( v6 ~ o( V& @# U( o w "GRID-SIZE-Y sliders, or decrease the "
, S+ I5 A6 x$ ?9 j6 a) I [ "number of cars by lowering the NUMBER slider.\n"' W$ C \/ d9 L! ^* i: q
"The setup has stopped.")
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& G4 B0 B) J' k% x ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% W$ ?$ K- {& P* ` crt num-cars
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setup-cars
* k; i0 B$ @8 v4 z set-car-color
4 p+ z, D: t# i R, j- n record-data
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;; give the turtles an initial speed* ~6 E+ T2 d$ S+ o1 X6 @$ x
ask turtles [ set-car-speed ]/ b" }& j* U; D# H, r* O
' A! s/ v/ I* z3 F6 q! { reset-ticks3 }' o7 J! Y. _/ w2 q* S( n/ h
end
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;; Initialize the global variables to appropriate values' @( P5 H$ X+ W @& ?' D: c9 k# \
to setup-globals
1 M/ o2 Y. }: j2 d* w9 Z$ @ set current-light nobody ;; just for now, since there are no lights yet4 W" P/ C2 F) Q Y* j
set phase 0
4 r. b. ]& P7 d$ u% W# R% ~% Y1 W set num-cars-stopped 08 T1 F$ i/ {: M1 @ q# `! \
set grid-x-inc world-width / grid-size-x
3 F# B; _1 e) ]4 o& j- O 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
6 \$ G# F4 X$ X. \" p+ { z0 x set acceleration 0.099& H* x6 h3 Z4 \$ \7 c
end. P! _! K" R& n) S. Y: E3 Q0 s
( F. B) Z+ @# N$ M;; Make the patches have appropriate colors, set up the roads and intersections agentsets,4 r& ^' n% T, r. T* q" V
;; and initialize the traffic lights to one setting
: d, t! e" g M' Vto setup-patches
' w; k8 |) b; S4 p ;; initialize the patch-owned variables and color the patches to a base-color
3 |& d: |* L% n2 q) w; H8 s ask patches
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+ W7 \6 G$ M. r4 p, i2 d set intersection? false5 }; o7 l2 l: h; Y
set auto? false( h7 W; c) z7 H1 N7 z, l5 h( q
set green-light-up? true
' b* _! ]/ C, ^% F' g6 c& Y7 i set my-row -1
6 J5 ?+ B! N s/ V set my-column -1! H# a& L& Z, p. ?) N
set my-phase -1
; N/ q& w- ~) A# {, s set pcolor brown + 30 D) n. j+ m' M" q1 k' g7 l- p
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5 |6 G f: z# `% u. d ;; initialize the global variables that hold patch agentsets2 J8 O( G, W9 I! g& f: S! y
set roads patches with
' l4 ]9 R' s% _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% d s) e2 `' u% f (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: ~ e$ B' e0 i0 ? set intersections roads with
% s- G {9 r, C, o7 Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! U; C7 b7 t6 D* F2 {! U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
' b# ^% g6 X2 T8 j8 m2 H/ M setup-intersections
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5 C h. {% ]9 w# D2 p其中定义道路的句子,如下所示,是什么意思啊?
2 X6 W2 J$ {% }+ |5 G: E3 u set roads patches with8 W( e2 j: Y# [' a& w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" K+ R" x% H d: [& Z( e R2 M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ W, f) a* X2 p8 }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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