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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。
" ~6 V! K/ |% W* P5 _, T: Hnetlogo自带的social science--traffic grid这一例子当中,/ ^1 B" y5 a1 a& c4 s: V0 H
globals, b" j- |0 I* T( m' W ~
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grid-x-inc ;; the amount of patches in between two roads in the x direction
5 F# w. F8 {) _0 O/ z/ {6 \4 z# V) [ grid-y-inc ;; the amount of patches in between two roads in the y direction
% o, O3 T+ A& | {5 a% ~. _ acceleration ;; the constant that controls how much a car speeds up or slows down by if, N- ]7 b' k* n; X" V
;; it is to accelerate or decelerate) y" z1 `# |2 V! X6 A9 h" s
phase ;; keeps track of the phase. @" C. }6 M7 ~+ `$ r7 V6 w! M$ b
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure" c# H) e# Z$ ?2 L3 L( b) P
current-light ;; the currently selected light8 L4 b% g4 n/ ?4 @, U' }- z: W
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;; patch agentsets
' o' I8 A' Y; }- B( C4 v intersections ;; agentset containing the patches that are intersections
0 p2 r8 `6 J+ _2 Y0 o2 A7 k roads ;; agentset containing the patches that are roads
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turtles-own+ s- m: y8 l7 _1 V) H2 {7 I0 O
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speed ;; the speed of the turtle
/ r0 t/ C/ D- W! W0 u up-car? ;; true if the turtle moves downwards and false if it moves to the right
3 S \6 E9 N9 x# ^/ u( F/ L wait-time ;; the amount of time since the last time a turtle has moved
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patches-own7 Q; F# q- T7 c. {$ V1 U
[
- i; R; O" b7 m1 g8 Q6 T/ M intersection? ;; true if the patch is at the intersection of two roads3 o# o4 @' A8 j" S/ o
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% Z4 N' D/ F- i& p: } ;; false for a non-intersection patches.
) ~& G: S4 J9 Q5 a" D7 ]# Z my-row ;; the row of the intersection counting from the upper left corner of the# e3 c! }6 s7 ]7 Z
;; world. -1 for non-intersection patches.9 N/ Q3 L6 V0 U4 [
my-column ;; the column of the intersection counting from the upper left corner of the
) b) ^% R9 W/ S; D ;; world. -1 for non-intersection patches.
8 R9 b: `2 ~# V' r my-phase ;; the phase for the intersection. -1 for non-intersection patches.* V' w# B4 F2 o( c
auto? ;; whether or not this intersection will switch automatically.
( T# O( ]4 u, N( y ;; false for non-intersection patches.
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3 \& `3 \6 {: f;;;;;;;;;;;;;;;;;;;;;;
$ g5 _ i0 Y2 A# y/ S( ?' K;; Setup Procedures ;;* p' x+ d5 V: [. L
;;;;;;;;;;;;;;;;;;;;;;, z( F: U9 _- ]% t/ l2 N, Q
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;; Initialize the display by giving the global and patch variables initial values.* F, P$ N. V& P; z! r
;; Create num-cars of turtles if there are enough road patches for one turtle to0 D% l# R/ U3 u
;; be created per road patch. Set up the plots.
1 S+ S d0 c9 V4 Gto setup' V t. O/ s p" @
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setup-globals$ ]2 S8 x. }6 S R/ s6 T; P
* V4 X: @2 X6 Z$ a. X7 ^ ;; First we ask the patches to draw themselves and set up a few variables# ~& F6 ?' g i4 R- n
setup-patches
4 s' ~3 l" A( `5 v! s make-current one-of intersections
; ], a7 {6 V: G& w7 P4 \- s label-current
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/ t5 U2 ?1 a5 V4 B/ c set-default-shape turtles "car"
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if (num-cars > count roads)6 R t. Q3 O2 G+ m& ^* s5 m
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user-message (word "There are too many cars for the amount of "
* T8 _" \: M, r, c% N: K8 | "road. Either increase the amount of roads "
6 @* X1 T/ m# R* A3 ?0 b "by increasing the GRID-SIZE-X or "
( O6 h0 a8 B2 S0 ` W "GRID-SIZE-Y sliders, or decrease the "5 \! P) `6 V; E; u/ N" _! z# {
"number of cars by lowering the NUMBER slider.\n"
+ Y; f3 B* u* B* l: j: Z e "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) R5 t( y: b, f1 S8 ~* [: \ crt num-cars0 V" ^ S( I0 d9 W9 C
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setup-cars) |2 J/ b* K- d' H
set-car-color# Y8 F" [/ Y+ F' Q4 K# j
record-data
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0 ^# o6 N; u+ u2 z) E9 o5 U ;; give the turtles an initial speed9 X, g3 n; ?8 _! O
ask turtles [ set-car-speed ]! ] d% B9 |' T2 n. m
/ A# l+ V- p0 @/ d2 b reset-ticks* N0 I8 @* `8 Q+ A- l1 x6 M
end
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% Y7 |7 ~, l8 s( F* v! m;; Initialize the global variables to appropriate values' a8 s+ w6 e$ p
to setup-globals# Q) `. K2 V! [7 c! g
set current-light nobody ;; just for now, since there are no lights yet
$ N# a, ~, P; v& }& Y set phase 0; G1 }6 q$ q! A3 n9 k
set num-cars-stopped 0 o$ `3 `/ j3 h; u+ f
set grid-x-inc world-width / grid-size-x
`; C4 R1 ?9 p7 z4 a; }' D set grid-y-inc world-height / grid-size-y" R4 N" P$ C3 h* ]- v" d
t' |9 m/ D( ~1 r2 T) a+ D ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ n4 E. ]: G4 r1 k/ p8 d; W* B8 K- J& J* z set acceleration 0.099
" D$ k# A- g4 A) a2 p! v0 Vend" N$ {, _- k9 M7 i
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ ~* Y. v1 m7 Z3 Q;; and initialize the traffic lights to one setting
9 U! \. H- y/ { Hto setup-patches4 [+ r8 d, N5 k0 G' h( A
;; initialize the patch-owned variables and color the patches to a base-color
/ V3 B F9 m6 f( k9 w ask patches7 n) l8 Y, ?: H9 r. E! M9 i6 \
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set intersection? false
) l6 i% e B. j2 x6 T+ f set auto? false
6 {! i- G4 {" H; j2 ~ set green-light-up? true
& T# ^: s/ _' O0 t set my-row -1
. U2 ^8 J; N$ `. j$ t set my-column -1
% f+ s- w/ J% H5 H) ? set my-phase -1
# ^! K I& d' [' t set pcolor brown + 3+ Q1 j1 l" n, F2 K* L
]
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2 T5 r% T8 K# T- [6 ^ ;; initialize the global variables that hold patch agentsets
! p5 X) O( V- |: y set roads patches with
K+ B8 p1 a4 g( c/ w5 P& G9 { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# E1 y' X, l- z2 C, { (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- q g g3 I) S: F$ ?$ k- Z set intersections roads with
$ m5 r7 V& ~4 i6 F2 m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: z0 a% Z/ E5 {" c2 u- t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" s! O# W+ j, m* j6 Y
) E0 l8 N& f& Z- q. g ask roads [ set pcolor white ]
8 T3 W6 n [; R# H: B setup-intersections7 ~! J# L8 G: O% p" e# Z
end
" N+ G' P% Y# ^9 I0 y; `8 d其中定义道路的句子,如下所示,是什么意思啊?
9 ]' S& }) z: G4 v% f7 F' k; U set roads patches with
. H- ?& V# A( D% y- C( B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ ?% q* F6 a4 B, P" L7 | (floor((pycor + max-pycor) mod grid-y-inc) = 0)] Y. A& k0 l+ a: e' s9 A
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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