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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 o. T; L; s6 {$ T! o- y! tnetlogo自带的social science--traffic grid这一例子当中,4 @& D2 `- `7 S. Z
globals7 e z8 J8 w8 [. l8 ]. K2 Z: n
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0 `) p4 ?9 M8 H% Z/ q: ]; @* z# g grid-x-inc ;; the amount of patches in between two roads in the x direction
; ]) f1 b& m( V% J9 b grid-y-inc ;; the amount of patches in between two roads in the y direction
; ` ?: \. Q% o$ i* l acceleration ;; the constant that controls how much a car speeds up or slows down by if. g1 t' j- @# D2 `# {0 X1 F/ s# q
;; it is to accelerate or decelerate
* S% |! V5 j. j$ b phase ;; keeps track of the phase
8 k5 {' y& W) `4 T: h num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure/ f S2 c% I4 H7 T+ ]
current-light ;; the currently selected light
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;; patch agentsets
, N5 q6 K( ]( O intersections ;; agentset containing the patches that are intersections, F2 |( r6 q& l0 W4 q: D
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle$ O( U8 E$ X+ a% i/ c# ]- q% {
up-car? ;; true if the turtle moves downwards and false if it moves to the right5 a4 }: u( n$ u+ L4 W/ y( N# Y3 J( H
wait-time ;; the amount of time since the last time a turtle has moved: d+ Z% b& L H9 D# p) A1 K
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6 m5 d: l+ v; O) g/ z8 @+ fpatches-own
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. T/ r& e& P3 D6 m, c, ~, v intersection? ;; true if the patch is at the intersection of two roads9 }) `/ r3 g7 \( k5 o' F/ X
green-light-up? ;; true if the green light is above the intersection. otherwise, false.( _$ J E0 o$ S5 x4 O
;; false for a non-intersection patches.
- d; y# o" D* Z, W4 a# ?# H my-row ;; the row of the intersection counting from the upper left corner of the
1 R9 X5 q4 K( \ ;; world. -1 for non-intersection patches.
$ ^% Q3 O% q# D7 a5 A. t my-column ;; the column of the intersection counting from the upper left corner of the3 a J/ e" c- F3 Z
;; world. -1 for non-intersection patches.4 T5 o' e. ~9 [" s" Z- t
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. _0 p2 H, e/ q7 J2 t& ] auto? ;; whether or not this intersection will switch automatically.
$ Q: z$ a3 k& J ;; false for non-intersection patches.' {% l- l6 f8 W+ M/ W, C6 x
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0 e$ ]* C5 I8 o/ W$ k: g8 y# N e% m;;;;;;;;;;;;;;;;;;;;;;
, ?, |" {4 a2 P& z- l. ];; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.. E7 w- F9 n! \. a; I! }) ]1 a- R
;; Create num-cars of turtles if there are enough road patches for one turtle to
* @& C! K1 H0 \2 W. U;; be created per road patch. Set up the plots.
: A! l1 J! W! ~8 G7 k5 x% Pto setup- I1 e. x$ |3 _8 Z
ca
1 Z+ F- U7 \2 O! h/ ]3 x/ g% ] setup-globals& S }! B: P, q
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;; First we ask the patches to draw themselves and set up a few variables
& \) e, m- l- O setup-patches
2 p+ ]: ]) Q- K' F& k# P make-current one-of intersections, g4 b9 S3 `9 k2 y
label-current
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set-default-shape turtles "car". f m: ?+ [' \1 e& ~* U
! k) e r( V1 d; h if (num-cars > count roads)
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# u( b+ W: D" k7 a user-message (word "There are too many cars for the amount of "/ S* C9 y6 r! D6 _
"road. Either increase the amount of roads "3 w' i- A3 W8 V8 M1 V( v9 M) b
"by increasing the GRID-SIZE-X or ": K# j2 ^: z' N# @+ }2 I$ S% Z
"GRID-SIZE-Y sliders, or decrease the "
% l' s5 n( z# N. e! b' i' U "number of cars by lowering the NUMBER slider.\n"
3 K5 I b( S: K: l) X0 R1 Y6 r "The setup has stopped.")
& t5 [. q2 t. D/ x6 H, l stop9 [+ Z$ X& f. g. J$ I! L
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 o4 q8 R9 z4 N: ~' s/ n: u2 x crt num-cars3 z N* G y' B" x
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Y: @1 w0 ?, X5 Q! @' h* T, i t6 E setup-cars7 t" A* k8 `! ?4 {
set-car-color
: X$ I( _/ u: X7 R; C record-data; R* R9 X |/ w9 `
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4 p; U/ g: f1 M$ _4 c6 Z- v ;; give the turtles an initial speed0 o1 p* q% o6 W" l1 X8 W( Z
ask turtles [ set-car-speed ]
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& w7 f3 f7 g9 N: A. J) D. \, | reset-ticks
: L2 C5 w- l% N$ j2 m6 H+ aend
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;; Initialize the global variables to appropriate values
. X8 _; e' V: ]& E; tto setup-globals
% r0 B" x! `/ c3 ~ set current-light nobody ;; just for now, since there are no lights yet
/ w! p% M. Z. I" \0 h/ f set phase 0
8 s" R8 J2 D, f6 q* F( W set num-cars-stopped 0 Q& T( r- I8 O
set grid-x-inc world-width / grid-size-x
, c0 @& U: }- |! Z5 Y4 b- M/ c) C 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 T8 v( H% C+ F ]1 Y4 [4 D
set acceleration 0.099% w# j" }- h$ Q& M7 h8 _6 H8 l1 |
end
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) [& J }2 |! T;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ s% b5 f1 @; d( a
;; and initialize the traffic lights to one setting
o; s! Q7 F U- Bto setup-patches
' i6 O( A) A# u) N1 Y ;; initialize the patch-owned variables and color the patches to a base-color
5 ~8 N# n8 A) H2 p) i0 Q9 n( p1 H4 Y ask patches
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set intersection? false
1 t& S t; N. Y. y- D% V set auto? false
z+ o h8 G2 }3 w set green-light-up? true4 m2 k8 {0 m- i8 j m) ?5 j
set my-row -1* |; r$ I! L# K/ N/ A/ Q
set my-column -12 N' S# L4 w9 h6 Q
set my-phase -1
4 y6 K5 H3 g. Q8 C# h set pcolor brown + 3" K4 l/ f& ~/ D- E9 x8 J- R/ C
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;; initialize the global variables that hold patch agentsets7 P4 }$ @. p( k; V
set roads patches with
; P) E4 `5 r2 ^) e9 {5 `4 G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- M& E; A0 f& Z: f5 v( | (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 h* \) h" j5 E" r9 X$ o9 e* H
set intersections roads with
: Q2 M9 p4 Y Z! g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, M/ Q/ b6 }2 N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 R. ~. j. B' T7 U) ~" S/ O, l
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ask roads [ set pcolor white ]
0 U8 v+ k3 ?3 i4 {. I& O setup-intersections) |! h( \6 _' G' ]$ p
end* s% [& u, ^' W+ S
其中定义道路的句子,如下所示,是什么意思啊?1 n) F! z0 l* ]) ~
set roads patches with5 w) G" y5 [$ a/ M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. K0 G5 e' m0 Q* r
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% `3 N! N7 \$ e/ f/ v
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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