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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。
) x& i! O- F7 ^3 A9 M$ Pnetlogo自带的social science--traffic grid这一例子当中,
! n8 P# Q' P. T& Iglobals' }6 Y/ @0 m5 o. Q2 V" U
[
; X4 D7 ?/ g- z grid-x-inc ;; the amount of patches in between two roads in the x direction
. K: t, s- Y; k* X( Z7 c grid-y-inc ;; the amount of patches in between two roads in the y direction
# v( _! H- F; R5 n0 H6 y0 | acceleration ;; the constant that controls how much a car speeds up or slows down by if( R! b# b* K! Q; r9 j' n
;; it is to accelerate or decelerate
. n# F6 |6 f; Q+ g/ ^ phase ;; keeps track of the phase% G) ~6 [( v( V3 u5 H
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 ?. r" ~& m- ^" P current-light ;; the currently selected light5 t, L! A" d, p* k
$ M9 L! }* X5 p: f6 x4 G ;; patch agentsets
' ~% f' ?8 X% a8 F. [" F( N intersections ;; agentset containing the patches that are intersections+ E, {6 \; l! Q' U: w
roads ;; agentset containing the patches that are roads- K1 }; G+ {4 j' G
]
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turtles-own S+ t5 d" T2 ^; q
[
' k( w4 }( T/ X speed ;; the speed of the turtle# G1 z! ~$ E/ q9 [* R
up-car? ;; true if the turtle moves downwards and false if it moves to the right( F9 T7 e! A% M4 e
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own, |* H: x- v4 T' M
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intersection? ;; true if the patch is at the intersection of two roads
7 o- D: {4 c' O7 Y' f green-light-up? ;; true if the green light is above the intersection. otherwise, false. X. G4 r& b. g$ [& {# C9 g9 D1 Y5 E
;; false for a non-intersection patches.
4 X% }6 q6 A" N& x my-row ;; the row of the intersection counting from the upper left corner of the
: w8 w& I( o/ }$ O! `3 D& ] ;; world. -1 for non-intersection patches.
+ d0 L& y, u/ w4 |7 j- ]. C! X my-column ;; the column of the intersection counting from the upper left corner of the5 a2 H. [* H ~% h* u0 v
;; world. -1 for non-intersection patches.. \2 p' m# }4 ?5 `/ ]
my-phase ;; the phase for the intersection. -1 for non-intersection patches. `6 B! }" D. `8 F
auto? ;; whether or not this intersection will switch automatically.
% \+ {# C. y* @) u& }. n ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
/ j* w# ]9 y/ k8 P& r4 f5 M7 M# @% P;; Setup Procedures ;;
9 l! O; G) R. D: ^- F5 [;;;;;;;;;;;;;;;;;;;;;;. B2 `6 d! J) D# b/ ? _
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;; Initialize the display by giving the global and patch variables initial values.
/ F: Q2 i, O0 o+ L;; Create num-cars of turtles if there are enough road patches for one turtle to' W8 T. E# f& l3 l. V
;; be created per road patch. Set up the plots.
' T% s; F! R6 _8 a1 h; s/ T! Q$ ato setup
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setup-globals5 y* k9 ?7 K8 P7 X6 Z0 f- f
* k8 R N) f" i; q ;; First we ask the patches to draw themselves and set up a few variables+ B0 l) v' V1 Z" @! V3 S8 v; V- W, _
setup-patches$ t, n7 e1 n$ `& s' }
make-current one-of intersections% |% n( \! D; Z3 K' |* U0 @ b5 I
label-current/ D0 M3 A* Z1 ~
" [7 P F4 \0 O5 r5 P set-default-shape turtles "car"
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; o- ^7 _) x" g" ~ k# N. Y if (num-cars > count roads)2 E; O& y% a$ T1 J# j# D
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user-message (word "There are too many cars for the amount of "
) Y" f) V( L P9 X5 b& b) T "road. Either increase the amount of roads "
- R( z% e! p* @7 l+ b% p "by increasing the GRID-SIZE-X or "
8 m3 t9 X, K# ~: [ "GRID-SIZE-Y sliders, or decrease the "# M+ ?1 S# K1 W5 D8 T' { L
"number of cars by lowering the NUMBER slider.\n"
7 o8 ?0 k5 r; z: i* B* ?/ R4 o "The setup has stopped.")3 q1 V; A+ O9 l# r! A; l" h
stop
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, C7 d9 L }5 |# J ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: `! a0 ?( J5 @/ F9 z/ q crt num-cars
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setup-cars7 t* y9 F9 Y2 o4 R M8 ^
set-car-color
7 t- w2 |. w; R! [& w p/ M) r0 G record-data
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;; give the turtles an initial speed
9 z0 J4 H( P7 p# B* @ ask turtles [ set-car-speed ]+ G" u3 ]' H- c# Y, m% n- f, p. ~
* m! p4 f7 |4 |8 S0 f7 B2 k! v3 H reset-ticks
1 p! l! @$ E) P G7 j" Pend
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;; Initialize the global variables to appropriate values4 K8 O4 Z- }% r. h' q; L
to setup-globals9 R; b$ P. x' w. p7 ~; W
set current-light nobody ;; just for now, since there are no lights yet2 X8 l( C9 K! w' T; i
set phase 06 ?0 j' e3 u. M; b" @6 V
set num-cars-stopped 02 R+ {8 U* y- d- E3 r$ q
set grid-x-inc world-width / grid-size-x2 ]# z( O5 |+ d# y
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+ }: l0 t' w% d5 U( y- H
set acceleration 0.0991 O2 l0 [+ T1 T1 \; u% ?9 ^' T; _
end$ |; ?; }3 f/ N1 N+ @' c2 J5 C
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; J- V+ a" Y& S
;; and initialize the traffic lights to one setting
5 b3 c- u( b' @0 Wto setup-patches" L* b8 q( ^# L; y4 V
;; initialize the patch-owned variables and color the patches to a base-color) A% E$ p1 u) y% Q! w* d- |
ask patches
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+ y! O3 j; m; | set intersection? false# c* z- _" F; Y. m% v8 K; V4 j8 t1 k
set auto? false/ Q4 j8 u. r" Y" t
set green-light-up? true/ L. q! z0 C% I1 P" c! O
set my-row -1
. q4 v1 `, ^9 \6 C }. b- e set my-column -1
@) V1 j& M9 u6 D+ K2 F' s set my-phase -1
* _4 Z$ B+ C& V4 |+ o! f6 i/ C v set pcolor brown + 39 s2 m1 s" {- M) j
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9 B: v, x6 F9 o- a7 ` ;; initialize the global variables that hold patch agentsets9 R0 S: L% `* `4 N
set roads patches with4 G1 [* T. M7 I, S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% C( `2 f; T. F' N) J: f8 }" v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 @2 v" W$ s8 Y set intersections roads with
+ x" _& D' `* Y( i' w8 z6 j+ t [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ w) p8 \0 f! A% j (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
+ L" @3 Z1 v0 P9 Z8 s setup-intersections
) P- T5 P( s) i: k8 Kend
0 T1 M. a; Y4 t2 w% r/ Q5 M其中定义道路的句子,如下所示,是什么意思啊?
7 i5 k" D$ I7 `; y; Z set roads patches with& ^7 W- h* ]' v6 H8 x7 W
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( F* I/ |$ h& z) D3 r# u: T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: [; n# l4 _$ W/ L, n- P
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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