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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。
+ n6 ~2 P3 f4 O2 J4 ]netlogo自带的social science--traffic grid这一例子当中,- o6 ^1 `4 e8 A
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction& u- ?( {3 E8 J* y
grid-y-inc ;; the amount of patches in between two roads in the y direction
5 x; ^: L; _; y9 { acceleration ;; the constant that controls how much a car speeds up or slows down by if9 J: [. u m. J! l- |; I
;; it is to accelerate or decelerate* H6 X* N# d! y
phase ;; keeps track of the phase2 j* o8 H J8 R- w- X. O1 Z) m/ }
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure, C b8 Y g3 D9 B: S1 T. D9 @. ~4 ]
current-light ;; the currently selected light
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;; patch agentsets
% D7 S* k2 L/ O intersections ;; agentset containing the patches that are intersections; H5 N9 b7 ~; ~ T1 s
roads ;; agentset containing the patches that are roads& @; _, ^ b; M
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( Y5 `1 Y7 y' w8 ]0 d! Hturtles-own, [; \1 F: A. x4 A+ K
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5 C6 f( T" O" J% e# R$ E3 T speed ;; the speed of the turtle
+ K8 F4 O6 s) f& J1 P0 w9 r( _ up-car? ;; true if the turtle moves downwards and false if it moves to the right
' t* t2 q6 Q L wait-time ;; the amount of time since the last time a turtle has moved. r+ q9 P+ x1 h
]
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* f3 M( g9 ]. s% l" Opatches-own
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intersection? ;; true if the patch is at the intersection of two roads
& F, L5 x& h5 N) T green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% I; m1 X+ l; C3 w: V4 p ;; false for a non-intersection patches.
3 t9 i+ b) P2 I- m z9 U3 r my-row ;; the row of the intersection counting from the upper left corner of the
0 D1 o# {/ W( l( m) x, d% x ;; world. -1 for non-intersection patches.
: p$ C1 \* L4 F! X3 ] my-column ;; the column of the intersection counting from the upper left corner of the
3 @' U, Q) E2 j( a5 x: O ;; world. -1 for non-intersection patches.
1 E" g+ g/ }- p2 [" a! v; M( z' ? my-phase ;; the phase for the intersection. -1 for non-intersection patches.6 }7 N& }/ R! X
auto? ;; whether or not this intersection will switch automatically.
+ J* W6 r" H6 C" i ;; false for non-intersection patches./ R9 h. b. M' I/ o, {5 y# K% V
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;;;;;;;;;;;;;;;;;;;;;;
, ]! x* n7 K1 |( H1 v, r( D9 A;; Setup Procedures ;;8 C4 u* d) e. I2 ]
;;;;;;;;;;;;;;;;;;;;;;7 }4 f2 @" \: J( n& u# r. H3 a, l
4 x \1 n& t& m$ ? W* K;; Initialize the display by giving the global and patch variables initial values.4 k q Z( k/ T2 E( t
;; Create num-cars of turtles if there are enough road patches for one turtle to
# |: y8 F0 c6 y! R$ f: ^4 C; e0 y0 ]4 c;; be created per road patch. Set up the plots.
% k2 P2 s# n; c: |& u* Vto setup
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6 }5 z' T/ x! [ setup-globals* y9 @8 v; @) u' i/ u' k
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;; First we ask the patches to draw themselves and set up a few variables
" x5 X( n# e2 n setup-patches
3 n! Y3 y9 w3 F0 u make-current one-of intersections( y+ f* F* v$ ~3 H% e' r7 V
label-current
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/ w3 c7 `. h" y2 [ I3 z6 w set-default-shape turtles "car"
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6 l! {% E$ {" {- ?8 s, J if (num-cars > count roads)7 E0 i6 j/ P! a- {$ ^& H
[
4 s7 I- _. v, g user-message (word "There are too many cars for the amount of "4 C" ~& `$ @( o; {8 ]0 H
"road. Either increase the amount of roads "
) y! ^6 r6 f5 b "by increasing the GRID-SIZE-X or "- ?! N8 I; R& A5 D
"GRID-SIZE-Y sliders, or decrease the "2 @' i3 b9 Q! i' p5 x# Y
"number of cars by lowering the NUMBER slider.\n"' n" N* B4 t, W( ^" v+ O
"The setup has stopped.")2 B( e$ K+ t# U7 t0 h- W2 G! M
stop
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0 ?$ s. V) k0 s3 W& ?" x ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ S5 e6 d7 S: v6 a$ S# b2 _3 K9 y* c
crt num-cars# M1 s ~; o0 W, ?7 |
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) V8 Q' c) J3 I2 g6 C, I- \, O setup-cars
! V. Y8 w% [% K/ G4 s, c set-car-color( M e. a b( h. P/ h
record-data+ ~+ {4 J' x* V5 w1 M# u C
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' P7 ]0 N; V& J+ [: m; D; w$ ] ;; give the turtles an initial speed/ L7 l/ T# S) f
ask turtles [ set-car-speed ]
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6 Q$ q; h6 z8 T) N8 Z! F+ e; t reset-ticks
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?9 K" O: B' D$ p' O9 |& y, {;; Initialize the global variables to appropriate values$ y: V0 c$ K1 x
to setup-globals( [5 [5 N5 f, T1 k) T* G
set current-light nobody ;; just for now, since there are no lights yet
5 \. B; G% N7 `# O set phase 02 L- h4 l! J" g8 I ]/ N1 \. H& B
set num-cars-stopped 0
9 J, P7 l; l" A% r set grid-x-inc world-width / grid-size-x8 s1 |8 Z* n6 E- b( d
set grid-y-inc world-height / grid-size-y
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) h( U' O. v5 I0 K5 F5 s ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ Z. g0 B' g) j" u- z" ] set acceleration 0.099
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; y7 X+ p0 v+ \" |5 C# A;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% y; Q+ b- b# d6 y- \ z7 N;; and initialize the traffic lights to one setting
6 W p C0 R+ i0 x9 _! e: d3 T. b7 F" yto setup-patches% y* r8 v4 t& w1 W
;; initialize the patch-owned variables and color the patches to a base-color+ Z v# {4 @/ B, O
ask patches
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7 [& M, J6 ?- Q* m( O: s! \) w6 A set intersection? false) @0 C: M' q( N* R6 j2 a
set auto? false
" d* @# N7 O. G5 B0 { set green-light-up? true w+ ~/ A/ J' b7 X1 Z
set my-row -1
- }0 k; l4 I- R2 E1 ?0 P: A" Z7 S set my-column -1% j( X& q# b( ?, z
set my-phase -14 i5 C/ e+ J/ t5 L' Q1 x7 F7 j
set pcolor brown + 3) \ ]$ n. }7 b6 I) h2 }
]
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- i3 a& ]. p4 X, g) C y ;; initialize the global variables that hold patch agentsets
' B' H4 a- J' H9 h4 k/ S$ e( R set roads patches with
+ w+ J+ }4 @" o1 Y; L6 O) U [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 m. B% M' { `. @& h" z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( B' B8 D" _8 X2 k1 y0 A
set intersections roads with: d$ H& M( u) ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ T$ ~! M2 v$ S2 t* N6 S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ n/ F9 z& }3 j: V8 x) y; B
( K( I5 O4 f- H- H7 S C ask roads [ set pcolor white ]8 }7 p# @; l! C- m% P, F+ ^9 T
setup-intersections1 k, q. k: J4 n% t# m9 {
end
' y% {% t @! h* m4 ]其中定义道路的句子,如下所示,是什么意思啊?/ e8 k9 i( B8 g; I4 i
set roads patches with" X7 t1 V4 S0 x0 Z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. q" e# o# f' P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 x7 x4 O) O3 L5 H* Q
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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