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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。' f+ _/ _( c9 Y0 t* `9 b; e
netlogo自带的social science--traffic grid这一例子当中,
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grid-x-inc ;; the amount of patches in between two roads in the x direction4 h' z; g# | z0 H0 Z; A) b
grid-y-inc ;; the amount of patches in between two roads in the y direction1 `1 t$ V+ } u/ S- s
acceleration ;; the constant that controls how much a car speeds up or slows down by if) y% U7 }0 P5 d1 D; l
;; it is to accelerate or decelerate
% e4 R' k6 E u2 J) M# K phase ;; keeps track of the phase
# M a% D d# K+ [, S l& I" D num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
; o2 O/ d" E) H current-light ;; the currently selected light) p9 S l# C1 c8 M2 f j* ^/ H$ ?
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;; patch agentsets
0 g0 P- S! Z. G4 H. }+ N9 R* X intersections ;; agentset containing the patches that are intersections
- f: e8 `3 \& m/ Q1 h) h% \* x roads ;; agentset containing the patches that are roads
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turtles-own/ g3 r& h! G; r, s" w5 r
[
& }5 F" ~% d' W3 e# t! c! ? speed ;; the speed of the turtle# }# K- P: v1 }7 j/ I
up-car? ;; true if the turtle moves downwards and false if it moves to the right
0 U3 K8 n- m o z' j* N wait-time ;; the amount of time since the last time a turtle has moved! y/ m0 {$ @4 n
]
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' ?* I+ Q Z% ppatches-own s2 x* Y0 i* \ W( W
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$ n6 W% y) t# @' T; r% B intersection? ;; true if the patch is at the intersection of two roads
- K4 K/ j; \1 n green-light-up? ;; true if the green light is above the intersection. otherwise, false.
( t* ]5 z" ^/ p# e$ v1 g9 V$ s ;; false for a non-intersection patches.# p3 S9 {9 x2 f2 n1 u' D7 Y' K6 c
my-row ;; the row of the intersection counting from the upper left corner of the' t; u4 U' r, I; v# S
;; world. -1 for non-intersection patches.
0 j% X4 M/ U& E+ ?. G my-column ;; the column of the intersection counting from the upper left corner of the
5 D9 H# s9 ?, A& W ;; world. -1 for non-intersection patches.
$ a7 n7 D7 V/ Q$ p& L my-phase ;; the phase for the intersection. -1 for non-intersection patches.
3 R% U& `5 I; d auto? ;; whether or not this intersection will switch automatically.
0 ^( Y* t0 M* K" V8 a ;; false for non-intersection patches.
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+ O# ?! O9 J! h- I3 Y0 J: B;;;;;;;;;;;;;;;;;;;;;;
" ~2 O! U% [5 w) z1 B;; Setup Procedures ;;* d2 z: K! a( L. n
;;;;;;;;;;;;;;;;;;;;;;9 ?! _0 K1 @) c7 v1 u/ {: p. R5 o
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;; Initialize the display by giving the global and patch variables initial values.0 @9 p! f) F, f* _* h. i( m: U; }
;; Create num-cars of turtles if there are enough road patches for one turtle to0 }6 p# y0 j+ o$ K: ^+ j% \7 d
;; be created per road patch. Set up the plots.
9 L) y) U: f, Z5 wto setup1 Y- s# S+ ]3 r- ]+ C; ^
ca
/ \6 C Q$ h2 W8 ?0 m5 n! o/ ?" b setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
+ c% r! I6 D/ L setup-patches
7 m! h; ~! V9 W; y/ Y make-current one-of intersections
7 S: ~8 X c4 i* v: A label-current
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q' d7 I+ F+ v. ^ V set-default-shape turtles "car"$ q- \; ]( o4 J2 f5 t
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if (num-cars > count roads)3 j6 R9 }* M- i- q/ Y
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user-message (word "There are too many cars for the amount of "9 q6 A' Y$ h- t) l) `
"road. Either increase the amount of roads "
/ F. ~" S* d' ~& L& m) m7 r. f! R' d "by increasing the GRID-SIZE-X or "
6 l `: n' P) u# P: N+ K "GRID-SIZE-Y sliders, or decrease the "
" i* v+ S; R+ z+ y; e2 E "number of cars by lowering the NUMBER slider.\n"
% R1 w, }& n1 r9 i2 ^; a G& Y w "The setup has stopped.")
* A7 ]( ?) g; ?9 u; _ stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 t' c8 g5 I8 ~ crt num-cars0 V/ c/ a2 l8 M6 y. ~( k
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2 `# c8 y& @- e# n' U( l setup-cars
; u# o2 C/ ]" v r" ^, H& R set-car-color1 ~( }( _: O' x/ l/ [" J/ o
record-data @$ h. h* E& e5 N; o; u
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;; give the turtles an initial speed5 i+ t( L/ N3 C: @ T/ O% @6 Z) T7 s$ Y
ask turtles [ set-car-speed ]
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/ X/ \2 g9 i8 ~7 V8 ~ reset-ticks7 \9 ~: h7 F0 [3 y7 [
end" A( w2 m2 @/ j9 B! i. @2 H
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;; Initialize the global variables to appropriate values ~! p& F1 z# s( W' [$ {
to setup-globals' K; \) H0 P; S% c+ ?7 g$ f5 {
set current-light nobody ;; just for now, since there are no lights yet
9 v$ n( Q& x/ T, I set phase 0+ D0 m! c( }6 l# c, K
set num-cars-stopped 0
7 E" M) ]. N! N7 `% y set grid-x-inc world-width / grid-size-x% g* p' }! e0 s9 }
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# U; D0 c8 b$ G/ `0 W: l) N/ o0 ^
set acceleration 0.099
y( H0 a8 f! U0 t# ]* N6 c& i3 Bend
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7 R$ V$ ~: _* ]& Z3 v) I# m;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: C5 A+ g9 r ]3 Y
;; and initialize the traffic lights to one setting
% Y3 L. F: y8 Q2 ~8 s0 r' Ito setup-patches( t, T C# c$ R
;; initialize the patch-owned variables and color the patches to a base-color
) E8 }; |( _: o3 g2 g ask patches
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1 u ]% `) y3 l- o/ G- Q# H: U set intersection? false
i& E; g! s( j) u+ j1 C9 E set auto? false/ h0 P9 j9 X) I5 K5 g. ]% g8 _
set green-light-up? true
- p& O( l3 ^' m' _7 q" l' V set my-row -11 R) H! V2 h8 M* C( x+ v
set my-column -1
$ @. F% X' c- ?% r# z1 e set my-phase -1
' I9 b, `; X6 k; v. L0 y set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets \& w- X* `1 @# V2 S6 l8 ]
set roads patches with9 x6 a/ ~) z) G- {- ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% {- M- j6 M9 F5 L4 q0 t: D' S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 f8 R+ y/ J% C3 c
set intersections roads with" p( i$ @1 Q! E" y! y% ^- o
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# Y' |8 }/ z% K! O+ Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; r/ m4 Z) u+ ?) C! R5 x% i
0 X' f9 B2 I) q% t5 G) w* ^ ask roads [ set pcolor white ]
' L! M0 ?- {, Q4 b7 C6 L( y D setup-intersections
1 Y1 e# _7 E& Q) a9 }- qend
" u) E' F4 A1 I其中定义道路的句子,如下所示,是什么意思啊?
3 m1 ^+ P" ?# u; a set roads patches with" Z7 x3 K2 V }
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, {5 w- b1 |# d2 j& o
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& l1 P3 O* g. Y# h6 ^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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