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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。2 p( T( G( E: ?' a$ j; |; w
netlogo自带的social science--traffic grid这一例子当中,
; F" Q8 X' m8 t" c- o7 Wglobals
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" g5 [* E7 `& S6 ?8 Z% C grid-x-inc ;; the amount of patches in between two roads in the x direction; G# M4 ?+ v- Z
grid-y-inc ;; the amount of patches in between two roads in the y direction
' x# g) v( V, O# m& l: ^ acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 [! i* L. z) Y* c, b* j ;; it is to accelerate or decelerate
$ Q" \: Y3 T5 T" y! }2 p phase ;; keeps track of the phase6 b4 Q& m& s% a0 S. W0 }/ s4 C9 y) G$ H
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% \# x/ f' d- T5 U current-light ;; the currently selected light ]! y6 I8 r% `9 u. V
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;; patch agentsets
9 l- L P' r' h- Z- H' }' E' i9 f intersections ;; agentset containing the patches that are intersections4 _" t1 c* B, l" |
roads ;; agentset containing the patches that are roads1 ^- Z+ _ H5 a% Z- f
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turtles-own
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* X' W! L2 u2 z2 i speed ;; the speed of the turtle4 A* U. D: F' O- B
up-car? ;; true if the turtle moves downwards and false if it moves to the right% i5 }8 b ^- Q" ~+ I
wait-time ;; the amount of time since the last time a turtle has moved& b: J/ k; ` a( T* @6 _
]
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2 R2 A. |* v+ P, dpatches-own
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& d: A' h5 ~7 U intersection? ;; true if the patch is at the intersection of two roads) f, R/ c w* `! ]8 Y* P" S
green-light-up? ;; true if the green light is above the intersection. otherwise, false.5 u; E |' u# m. K# s% O$ j
;; false for a non-intersection patches.
) }& ~) }# | N K& c+ p) e my-row ;; the row of the intersection counting from the upper left corner of the" @4 V+ ^# }5 Z* ]1 Y
;; world. -1 for non-intersection patches.
& D( s* f* h8 g6 s3 P @& e+ {( q my-column ;; the column of the intersection counting from the upper left corner of the
5 o2 Y. @ I s% A ;; world. -1 for non-intersection patches.
: j: O6 z0 i# p my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! E; e9 A" J1 I% O# O auto? ;; whether or not this intersection will switch automatically.( `* W0 h0 k! M `4 k. E( e
;; false for non-intersection patches.. O, k: N' k) S" h
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) \& |% o& w+ N1 R( @5 x6 z) _3 R; G;;;;;;;;;;;;;;;;;;;;;;
' R! T' C; W3 a. c. v: G;; Setup Procedures ;;
. b4 m' O2 P7 p4 z; i8 e;;;;;;;;;;;;;;;;;;;;;;* v& ^# s( m) Y# R6 T
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;; Initialize the display by giving the global and patch variables initial values.
1 X; r- T& E* P& z& H;; Create num-cars of turtles if there are enough road patches for one turtle to
2 o) S1 H6 ]0 G- m3 k) Y;; be created per road patch. Set up the plots.8 W j3 y: u& L/ b) y' [3 N
to setup
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" w" a Y) p9 e setup-globals: r% }% P. k6 h! p w
4 c; X+ e g: d# K ;; First we ask the patches to draw themselves and set up a few variables& V. T& A5 i3 L u
setup-patches
( u, U" m2 E+ T make-current one-of intersections
8 b# D0 h8 g$ N a/ e6 f) s label-current
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5 y8 l' u% J; o: p+ S set-default-shape turtles "car"
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) O& x2 P) l+ o if (num-cars > count roads) c' E5 Q/ C& C" {$ C4 _, c
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user-message (word "There are too many cars for the amount of "/ q6 W+ P5 ]% B; J# \: M
"road. Either increase the amount of roads "! Y, m+ Q. V: w" L* n- |4 F
"by increasing the GRID-SIZE-X or ", F3 X5 x* K. K/ ] q
"GRID-SIZE-Y sliders, or decrease the "8 M% W& f9 Y$ {
"number of cars by lowering the NUMBER slider.\n"# m/ @2 o. U V, a5 q" v% q
"The setup has stopped.")
+ {. u. r$ t0 k/ P6 r stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color' o! b3 R+ K7 A# i
crt num-cars
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setup-cars
, W5 \& m1 B0 P! v3 _7 a# r set-car-color0 a" R; \" D6 Z4 Q% K/ A
record-data. O7 v ]/ h* N! v& m
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+ J7 }( a5 M8 a' e! p3 U0 a( E1 g ;; give the turtles an initial speed
( H0 i( m1 s. ?8 b: z# D ask turtles [ set-car-speed ]1 w+ ~( v' T- v
8 s# _4 r" G+ B7 m' } reset-ticks3 J. z* l& @. G! y9 M
end1 b4 W9 |5 B0 |- U+ g
( H$ M3 ^$ U- T" U1 j$ |: }2 b U;; Initialize the global variables to appropriate values
8 Y, P; H R0 S/ \9 i4 ^) wto setup-globals8 ~9 ]- K C" Q7 A: s! K, @8 Z
set current-light nobody ;; just for now, since there are no lights yet9 q, j, x& E. w) e
set phase 0
; b7 m$ [6 H. t* [9 i set num-cars-stopped 0
% l% o. t z& p& x% I* Z set grid-x-inc world-width / grid-size-x
+ A3 x+ l" ]) `9 i 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, k7 R! o8 v* k# w" ^( v0 c8 n
set acceleration 0.0998 t% o& {( c. M& c, e, U4 Y' Y6 `
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 B; B% d5 R. u3 l, s5 Y a
;; and initialize the traffic lights to one setting
, O: j- z0 v5 s0 z' `. F9 Q; |) fto setup-patches
6 D/ ~6 L! q) u2 @% A; F ;; initialize the patch-owned variables and color the patches to a base-color
1 V- K/ t( t2 g0 h ask patches
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set intersection? false
, i' D5 |1 C" G; [5 d set auto? false
" n# O# r8 W0 n G+ M+ p set green-light-up? true3 R( s |+ i6 l. z0 p# P
set my-row -1/ X( V$ L9 n* c$ x* a
set my-column -1
; ?, ?! x; Z* ^+ S* _ set my-phase -1
; ~, H4 @2 {- g8 \% G) } set pcolor brown + 3! H Y$ q/ Z/ c9 {1 l' _6 W
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;; initialize the global variables that hold patch agentsets
+ a: d' B& U: y( N" M set roads patches with( b& k# Y H0 r! ]% V8 N/ C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- ]( ]$ _. {% u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( h$ h/ C$ Q. o' ~$ p
set intersections roads with
9 \( F5 K- \% }) E$ K* x% T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and% ~; s3 s6 E" J0 u- y4 Z) c3 ?! X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
+ _2 x& J. L; d5 r, N setup-intersections: k% N$ k+ _4 O, h; M t
end& W# W" ?0 m. R6 {" W, c# R( }( r s9 s
其中定义道路的句子,如下所示,是什么意思啊?6 \# H" |& |7 S& N( I m
set roads patches with/ h9 _3 j' s6 I; j' ]8 R
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 J0 f* O5 m# c5 t* X! u9 l
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 p) ~$ i$ s" w1 l" L
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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