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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 Q+ N$ D7 m1 Onetlogo自带的social science--traffic grid这一例子当中,9 f" n) @# T- T. n/ x! n! t- f
globals; G7 A, X8 f- @: z6 e# O
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grid-x-inc ;; the amount of patches in between two roads in the x direction3 Z0 D4 r/ n, v$ x2 A2 `. t4 b1 v' K
grid-y-inc ;; the amount of patches in between two roads in the y direction4 O! |! I' Z y2 I2 V( r: D
acceleration ;; the constant that controls how much a car speeds up or slows down by if
' }# G' l, @& `* b5 Y* D3 O6 b ;; it is to accelerate or decelerate Q9 Y V7 t9 ~0 J* N9 n7 U
phase ;; keeps track of the phase
+ w8 E! H | ]" }4 c. [ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure+ D) r( E* j5 y4 s7 ~3 k. R
current-light ;; the currently selected light! E* y# i% O; [9 Q
+ D3 T k8 S* \7 i0 O2 r* u8 j ;; patch agentsets
6 O* j) [, { i! { U i intersections ;; agentset containing the patches that are intersections
4 ^3 Z6 i% y( u" P roads ;; agentset containing the patches that are roads* B2 q* P/ w S5 b1 j4 R9 V
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( X) r, q* m. x1 |" T- V1 Zturtles-own7 Z# R; \2 G( R3 L# Y
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speed ;; the speed of the turtle( i, g& x3 G1 ~8 L. a7 C2 z
up-car? ;; true if the turtle moves downwards and false if it moves to the right
. S2 t# Z( ]5 ^+ r8 f. M: a wait-time ;; the amount of time since the last time a turtle has moved
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patches-own; E" C/ r& a b v: d
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intersection? ;; true if the patch is at the intersection of two roads
: _4 V5 E# ~# ?4 [0 y green-light-up? ;; true if the green light is above the intersection. otherwise, false.: _3 A: [# K4 j: J
;; false for a non-intersection patches.2 o" a/ X9 C' |7 ~. _/ c
my-row ;; the row of the intersection counting from the upper left corner of the" h6 {- x. f7 h H! Y$ o
;; world. -1 for non-intersection patches.
; U4 T! B4 a! g8 ` my-column ;; the column of the intersection counting from the upper left corner of the3 N$ g' z# \- t5 a+ s+ t8 r
;; world. -1 for non-intersection patches.
2 T2 t9 V( d6 E/ N my-phase ;; the phase for the intersection. -1 for non-intersection patches.
9 M% e6 j6 ^) q$ c# M0 U auto? ;; whether or not this intersection will switch automatically.3 ?5 o' s4 n1 D9 t" o# M
;; false for non-intersection patches.6 f# V/ U) A$ \ U2 P' d
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/ |5 x4 o6 a8 j& v! c;;;;;;;;;;;;;;;;;;;;;;
/ |; P; d4 r5 [2 s Y+ r;; Setup Procedures ;; j& t2 \2 ]- \, _9 ^
;;;;;;;;;;;;;;;;;;;;;;
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6 W- A- `1 b$ c! \. U5 S;; Initialize the display by giving the global and patch variables initial values.- y" |6 [' {( Y* b' X4 j
;; Create num-cars of turtles if there are enough road patches for one turtle to
C4 s' w3 w- x0 U;; be created per road patch. Set up the plots.$ u* ^' o/ ~/ E9 W/ H! H* r1 ?
to setup$ t: R. D! Q, F( q4 R/ S% P9 N3 ]
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setup-globals: U L7 R- d3 l$ U) N
* E8 F! p1 N- d7 O! _3 Q ;; First we ask the patches to draw themselves and set up a few variables
( G1 T$ }/ O, Q+ S$ B: y, F2 Y setup-patches7 y+ r7 r( K: L2 G
make-current one-of intersections9 ?5 I' I( ]# Z; `+ U
label-current
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set-default-shape turtles "car") Y8 z" d6 q( p+ q- ~. ]
! |7 `( Z( c6 N0 X if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
1 c- k- C! }: H9 m4 A# F "road. Either increase the amount of roads "
' c' G+ s/ ^/ E) L4 P3 p3 T "by increasing the GRID-SIZE-X or "2 b1 r K% n/ u6 K, e/ a
"GRID-SIZE-Y sliders, or decrease the "' Z W8 }# w8 Z+ g
"number of cars by lowering the NUMBER slider.\n"+ ?: K. J* X+ Y# ?, W% D
"The setup has stopped.")4 \7 a: t2 x" i& m, H6 w
stop
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# O# c, X, g3 q5 I$ i+ A1 l ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 \& |) @# N( v% e crt num-cars7 N+ H6 q5 H$ Q: |4 x" Q5 [- X
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setup-cars/ n t. W$ ~' b* c1 H2 r' E. I& ^
set-car-color
9 P) e# `3 f% w' H: c7 a record-data
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. r. V$ y! v4 c+ |8 |$ H ;; give the turtles an initial speed
, z+ i6 s6 N8 ~* I6 ]7 _; c, n$ O$ n ask turtles [ set-car-speed ]' _" C/ a! H& B/ e V# c, \$ s
9 G0 Y: H/ ?6 ]; d) {9 S4 L reset-ticks. U9 @/ l9 E) ]; p! P. o
end
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- L& K5 }7 x) G0 l, W, [; J( }1 z;; Initialize the global variables to appropriate values' h1 @: C' o A- @
to setup-globals
$ K; n3 n1 }! b o- J8 E5 D% i8 y set current-light nobody ;; just for now, since there are no lights yet+ ], I" v3 q1 L- A; x2 g
set phase 0( Y, b7 z1 {$ F( V
set num-cars-stopped 0
1 Z/ i3 n: [$ w9 K; k! B! W( ^ set grid-x-inc world-width / grid-size-x
/ c9 Z9 G$ N' V9 Y% D2 g 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
* U {3 i6 @# M( }5 b- h# P( D set acceleration 0.0998 j, T5 `+ S9 M) R* y; c
end
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, ?" S3 R5 \6 z; q& L, V) t;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ h/ v8 g6 c6 x( L3 t;; and initialize the traffic lights to one setting
- Q) ^# U" B/ G# a$ n: U+ Mto setup-patches
_0 _, R/ g" K, I o ;; initialize the patch-owned variables and color the patches to a base-color
% R+ w x: M0 f ask patches' Z) N; k6 T* _& X' T8 F
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set intersection? false
; l, V6 D, j/ m set auto? false9 F7 [" ]6 l. e
set green-light-up? true
" W' f) R, a! Y set my-row -1
, V [* M7 o0 m8 C+ e set my-column -12 K( s/ ~/ C& w, T7 ^
set my-phase -15 k K; ~5 i3 N
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets& E) N4 p( O" h& E- z. J/ s6 f6 I
set roads patches with
+ r. I5 U% Q3 T+ W% y' } [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ @0 a/ i; Y' o+ i3 m/ r (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 R. c! z, i. u7 j, n
set intersections roads with9 F5 h" T' x8 @' n: L" X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( k4 A4 D% v H. d3 @: T. g- K# x (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ P+ H" |9 }( B# e0 H L
. C& z8 s8 u) w8 }7 N6 S( d9 C5 u ask roads [ set pcolor white ]
6 r7 G, p9 b" z1 O. [9 A setup-intersections6 G9 g, {9 ]! X! H! r) R( V4 h5 i( {
end
6 [5 Q$ p1 B4 e7 h t9 I其中定义道路的句子,如下所示,是什么意思啊? \! u" @: U& _
set roads patches with9 g* H* T3 ?# Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 D! C2 A9 @& U+ t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- {/ D# K5 M0 |; W2 c' F8 R1 \
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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