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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 b, @% F& W& z3 e0 C- v1 j5 lnetlogo自带的social science--traffic grid这一例子当中,
3 \8 H8 e( X: L6 Q: c) I% yglobals
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$ X3 J8 F+ o4 U7 S7 R4 } grid-x-inc ;; the amount of patches in between two roads in the x direction z M: _4 p0 e5 k
grid-y-inc ;; the amount of patches in between two roads in the y direction
2 A) J( `$ c' o8 a* o2 a acceleration ;; the constant that controls how much a car speeds up or slows down by if5 d9 U& {" m3 c
;; it is to accelerate or decelerate
: U# M0 M5 |8 _3 A- K7 o phase ;; keeps track of the phase5 K g- z; z. B6 R b+ {
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure; T* J P. j! ~( c3 J" K6 G
current-light ;; the currently selected light
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4 K- k, r3 U: ` ]0 g ;; patch agentsets8 d7 I$ u: \( \/ _. {
intersections ;; agentset containing the patches that are intersections
7 w7 D9 g$ J5 G- ] roads ;; agentset containing the patches that are roads9 B9 e- g- z# t; ]: g
]
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4 X) x& m" j) q! @: Pturtles-own
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& F/ d! \2 f. C* `' O speed ;; the speed of the turtle# F) Y6 k+ l8 Z( q
up-car? ;; true if the turtle moves downwards and false if it moves to the right" r6 L; \2 s% [: l' A) q l
wait-time ;; the amount of time since the last time a turtle has moved
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( T A* c; e3 p: P2 [patches-own
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intersection? ;; true if the patch is at the intersection of two roads
. C* ~. k( H/ z green-light-up? ;; true if the green light is above the intersection. otherwise, false.
/ j- Y9 J5 { \% z8 C' O ;; false for a non-intersection patches.
2 G' J$ c; @& G) `/ G0 ^ my-row ;; the row of the intersection counting from the upper left corner of the; y+ y! w$ q6 Z( V) J" H0 c
;; world. -1 for non-intersection patches.0 E0 f! M. v3 r" [
my-column ;; the column of the intersection counting from the upper left corner of the" u4 U/ `6 t3 U6 M" N D0 M ^
;; world. -1 for non-intersection patches.3 d% S. W: s+ ?% E# A" A7 \
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
5 v( a8 d- v3 ?9 ^ auto? ;; whether or not this intersection will switch automatically.$ Q1 o9 s0 \1 V" @# E, y
;; false for non-intersection patches.
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1 ~' S. V% m/ k: O7 b$ Z- c; I;;;;;;;;;;;;;;;;;;;;;;6 w) D/ j- b% `! G
;; Setup Procedures ;;' M0 x. @0 g s! S" |
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.* }: t2 W1 n- ~2 l- X$ U3 V
;; Create num-cars of turtles if there are enough road patches for one turtle to
, B ^% N* A @% T; N. M;; be created per road patch. Set up the plots.; H/ w8 p2 v$ |. |* b0 t9 z
to setup1 B' H, k! G6 K- H8 T
ca
( [2 u& m( @) ]6 R7 W6 U9 ] setup-globals
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8 q' N" y, H+ u; Y- O ;; First we ask the patches to draw themselves and set up a few variables
9 ]9 C( f0 n; W# m7 `: @( m% Y setup-patches
' P( ?5 s9 m" I. Z& d make-current one-of intersections
V. j i! b" |8 C2 e Y1 L( [: C2 r label-current1 d! X7 Z# b8 w7 u
( `0 W k o( p# o set-default-shape turtles "car"
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* @: H5 m0 ]4 \0 u8 x O if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "7 e+ ]( S. n' t( K2 W
"road. Either increase the amount of roads "* M P7 n0 N0 _) v+ Y
"by increasing the GRID-SIZE-X or "/ m0 N- K0 @, P% H5 P& w
"GRID-SIZE-Y sliders, or decrease the "1 \+ i+ J0 L$ a$ o6 U
"number of cars by lowering the NUMBER slider.\n"
" @/ b6 I. }3 L "The setup has stopped.")4 J4 n2 ?; f# n1 K3 F% W b) G+ k
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 |9 e* u2 g/ q, Y3 m: U, K
crt num-cars
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setup-cars* n. E) x# w3 G
set-car-color
! B) O" p! U8 B* O. n1 i record-data3 _3 b8 K* \* Z! D2 @
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, y: V* U8 |1 L, r$ c5 z u ;; give the turtles an initial speed# L) E/ [0 p: S
ask turtles [ set-car-speed ] w# n4 S! z, C) v' y
% N3 ^+ J; C0 w: f+ A2 m4 ~ reset-ticks$ C1 ^- u2 C8 Y6 f) R& `
end' l3 c0 A s) m8 g; ~
' f* a/ k. X1 U' \* D, H8 F/ o$ \;; Initialize the global variables to appropriate values v4 Y! S( I, N/ H" n& t. ^4 B P
to setup-globals" C% Z% e# V: P& |1 B
set current-light nobody ;; just for now, since there are no lights yet- H# J) k/ x' N0 P9 _/ w8 A
set phase 0
$ w& O2 |2 }. C set num-cars-stopped 0
6 `1 p' C8 r0 A$ A* N set grid-x-inc world-width / grid-size-x1 i1 D4 m1 r( h; M
set grid-y-inc world-height / grid-size-y
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0 s7 ?* }6 n+ |( y1 k ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; q1 X1 f$ M% F+ O9 b set acceleration 0.099/ Z& T& E4 C1 W' o1 A
end- n+ H. A. A4 J; y
( g9 b8 q7 `2 Z4 Q: ` r8 z8 v+ e0 {;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& X0 g i+ R' _$ N4 N) ] c& S" d;; and initialize the traffic lights to one setting
q9 V' u8 f9 U4 y2 qto setup-patches& S7 H- z1 F; \% S
;; initialize the patch-owned variables and color the patches to a base-color
$ l$ ^9 U; N) T. {1 ~! @ ask patches" X ^3 v( r/ M8 m
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set intersection? false
. }: z5 ^6 k. f! f3 O/ F) @ set auto? false5 C( l4 j" i; f; h1 Q7 s2 C
set green-light-up? true
: f) g. p" ]9 I0 Q: Z set my-row -1
; I# K. `0 S% O! b$ D6 A( W$ ] set my-column -1) S: x' G4 Z: S K! |8 P) H
set my-phase -1) J: |# G, A* G' B" L1 m' b6 d! z
set pcolor brown + 3$ W& I1 U9 v, t* F, J. c
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2 x) Z+ L* d; W: a ;; initialize the global variables that hold patch agentsets" ?5 ?: X5 f7 h+ ^. t
set roads patches with7 _! n2 H1 K" {! N8 k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ B: L' p, S' T (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 O# L% ^8 H, r( B# l& U1 T' X9 r" O
set intersections roads with$ N/ _3 c3 R# @4 y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: A6 u9 D, W' t6 S! ~+ F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" l o+ v8 l( S
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ask roads [ set pcolor white ]
" L4 r. i% w# y- q setup-intersections$ O. L/ g9 t& \
end
& G: f( A( C' E其中定义道路的句子,如下所示,是什么意思啊?
3 ~$ h# c, ~3 M- p7 S# y0 T" w, n set roads patches with
2 i) C- K5 o! K# Z* S [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 _6 E, y( Y9 @0 I& N \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. S/ ^- G7 h1 H* w' S) }! |' v1 N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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