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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。
$ q( X2 n* n- i" v' `netlogo自带的social science--traffic grid这一例子当中,, D! k+ d7 l) F: [) K [) ^9 ~
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( D7 L4 T3 W3 M: r* Z grid-x-inc ;; the amount of patches in between two roads in the x direction, P' _2 D& j7 l; z
grid-y-inc ;; the amount of patches in between two roads in the y direction
' F' f( v% `, Z acceleration ;; the constant that controls how much a car speeds up or slows down by if
r& x' _1 x6 [/ @; `: r' D ;; it is to accelerate or decelerate
2 J6 d. @2 k, r phase ;; keeps track of the phase
* _2 I/ x2 T) w( Y. o+ [/ y" V2 b num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 z+ _6 k% B: o- f/ r current-light ;; the currently selected light
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;; patch agentsets' W( O4 f$ f, i+ O
intersections ;; agentset containing the patches that are intersections
0 m5 g. M. f% i( [) k; _1 B roads ;; agentset containing the patches that are roads4 R6 d) W# Z+ r# g
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2 d- _% r; H( ~* |2 oturtles-own
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, K" |& \% s q& Q( ^4 S speed ;; the speed of the turtle
$ ?3 k7 N: N: o8 B! r up-car? ;; true if the turtle moves downwards and false if it moves to the right' [/ S3 w* W" A$ z4 Y D8 d
wait-time ;; the amount of time since the last time a turtle has moved
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" V3 q0 f$ _ ]8 v9 Q, ~patches-own/ \ u' l$ ^7 X
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9 D2 O% H# l) W; L* @ intersection? ;; true if the patch is at the intersection of two roads9 \! _* y' ?/ U' I
green-light-up? ;; true if the green light is above the intersection. otherwise, false.& i. ~" X' t5 d, B
;; false for a non-intersection patches.& w% i& ^" g8 Q! b, q
my-row ;; the row of the intersection counting from the upper left corner of the
- w/ p. c# l$ }3 T+ A ;; world. -1 for non-intersection patches.5 N& j" l( Z( G0 Y. X2 V
my-column ;; the column of the intersection counting from the upper left corner of the! o: }; h4 H& ~' ^
;; world. -1 for non-intersection patches.
7 v7 I; R1 W0 C6 P; l6 t: u, \% n4 {4 ` my-phase ;; the phase for the intersection. -1 for non-intersection patches.' E% [1 N- T* o+ i$ K4 d/ N' \
auto? ;; whether or not this intersection will switch automatically.
9 }' h2 k4 X7 f8 @# i ;; false for non-intersection patches.
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, n2 F4 k3 n, N; \7 _;;;;;;;;;;;;;;;;;;;;;;: K3 m6 L$ {' |6 J2 W1 B; z
;; Setup Procedures ;;, W" y2 _, k" Q
;;;;;;;;;;;;;;;;;;;;;;
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3 q6 R1 b* O' G f9 c;; Initialize the display by giving the global and patch variables initial values.6 j0 q$ x. }! d3 R
;; Create num-cars of turtles if there are enough road patches for one turtle to l0 i0 l2 g$ S* p
;; be created per road patch. Set up the plots.6 x5 L2 S: {6 |- Y) |# \2 _: v
to setup
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+ b; Q" @% e( D- ^5 ^( u setup-globals7 y# ^, i/ B- M* E* F* z+ E! f0 [5 q
- c! a e- e3 D! ^4 l ;; First we ask the patches to draw themselves and set up a few variables: e$ W/ @# C$ S$ D# r
setup-patches, I5 x' R* t- g7 V2 n
make-current one-of intersections( o% ~. p% t N; g% {3 x* f
label-current! X) j1 P5 Y" Q
# W" v5 K: O# {: A" }7 a set-default-shape turtles "car"2 q" j# G2 k4 d1 |7 }: z }
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if (num-cars > count roads). S3 f0 a/ K* Z4 M3 i t' ]
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user-message (word "There are too many cars for the amount of "
3 Q4 z& {. C" F, _ "road. Either increase the amount of roads "
6 i9 R8 K& g6 m. r7 k "by increasing the GRID-SIZE-X or "7 n6 i& v+ s6 y# B
"GRID-SIZE-Y sliders, or decrease the "
8 f+ {+ Y6 A" B0 M" V, A* r& a "number of cars by lowering the NUMBER slider.\n"
4 r6 j) R. N% a4 | J! E$ _ "The setup has stopped.")8 U2 c9 J8 X# m7 r* q4 F- e
stop
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9 ~8 _3 A0 {. ~4 z ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
0 M, |: o# G' b4 Q9 Z8 a7 d% d crt num-cars. l6 r2 H. w7 F$ e6 k; N+ ~8 x+ V/ P. c
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setup-cars F: V' j4 |6 M [7 R: f b
set-car-color
4 b- O4 y+ l! G( k record-data
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;; give the turtles an initial speed
! B# l) v. D7 ~+ o' |# M/ J ask turtles [ set-car-speed ]
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6 s h) n3 g! w1 Z: S. U' `& M6 T" n, N" X reset-ticks
( U* O, E( Q3 Z o% oend
3 D/ w6 i% k A- H" m, A4 A# T) x
" v( c% @+ W( {, s' g9 q;; Initialize the global variables to appropriate values; R1 r, \& P$ N1 _
to setup-globals
4 b6 O% @ j3 m0 d& U Q) C& h set current-light nobody ;; just for now, since there are no lights yet7 M5 j% D9 E; h' T8 o- |
set phase 0
1 `. v' g. p' w set num-cars-stopped 03 _ u* J# A. X- `" ?* f. k- }
set grid-x-inc world-width / grid-size-x
8 }7 g$ G2 Q* ] set grid-y-inc world-height / grid-size-y: n7 }, W! V- E0 b. l
- f% J" Z$ ~% V# k! V3 n ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary! m& F7 N3 f4 Z7 B! _. z! p
set acceleration 0.099
4 s( }: s9 S( O3 c N: }: ^end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ |1 F. l: l0 b' s# o# A
;; and initialize the traffic lights to one setting
) @0 ^8 a" |6 B) X Wto setup-patches5 g6 b" Y: ^- l
;; initialize the patch-owned variables and color the patches to a base-color
+ V' |4 F7 Q d* _6 ~5 c: h ask patches$ h* q9 o- q( D) p5 u
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0 `& Q& c1 _+ L0 P# z. o3 O set intersection? false
& }, L# @. Y7 A2 N- D* B; P set auto? false
4 m6 ?0 g: e/ k9 H1 v9 w6 f set green-light-up? true% K+ z) `/ D+ j0 [- Y! q
set my-row -1
" b" v1 l. Z9 I2 Y set my-column -1
& T+ z1 d# l/ Y set my-phase -19 f2 m& I4 h6 q$ E: a1 B8 }, J
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets: w; {- t+ h2 j: z/ D
set roads patches with
; ]& p$ K6 j$ p' ?# I# h [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" x5 ~( s0 C4 { (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 k7 Q) J e ]1 w" l& x set intersections roads with1 l6 t, S- o% |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 d/ `0 V" D$ H+ G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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8 Q8 S' Z) Z6 d' ]" ] ask roads [ set pcolor white ]
0 _! l$ M& n2 D- L) M8 M# } setup-intersections* T: J! e1 [& m# l# q
end
: C; t* `5 {8 O9 M8 s其中定义道路的句子,如下所示,是什么意思啊?
8 Q2 ` v* M0 }4 t+ b/ H7 Q% ?$ R( ~3 x/ } set roads patches with" t" T. r: I! w0 G! p
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. X8 @; K& H1 v3 v: g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* O" @$ j. t# |+ F! J) y- e% S, 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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