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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。- z0 Q7 `# y5 l; k S8 l$ f! h
netlogo自带的social science--traffic grid这一例子当中,
! P: V6 n6 m2 N& y1 Z1 s' u% q6 Q8 tglobals* J1 a& [, q; A. g
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- n" a* Q1 ~) Q grid-x-inc ;; the amount of patches in between two roads in the x direction/ ^4 v8 Y# j2 _. Q, l4 m9 V0 _$ P
grid-y-inc ;; the amount of patches in between two roads in the y direction8 I% i4 m. \& V }8 Q
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 A8 g; S K! A8 v7 C* Z3 U* w6 F ;; it is to accelerate or decelerate' _+ _& t' c. I% s4 c& k( }
phase ;; keeps track of the phase. W9 `5 Q: d4 t. ^
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure. S' c ]' T% a' p% X" T1 s
current-light ;; the currently selected light- B3 t B4 W( X
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;; patch agentsets) E0 A. b. J1 S# i0 j! f0 T5 c# ]
intersections ;; agentset containing the patches that are intersections
+ Y: \7 o3 K) W roads ;; agentset containing the patches that are roads2 O r8 U: h" b, `
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8 @! n8 F/ U, v8 r& m) f' f' _turtles-own
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5 J8 a) C, h+ X% O+ O. t: r- g speed ;; the speed of the turtle" L) z) Z4 m n
up-car? ;; true if the turtle moves downwards and false if it moves to the right7 B& @9 ]& `6 a6 ?% t: c
wait-time ;; the amount of time since the last time a turtle has moved2 }) u" T0 G i4 ]; m4 L! q
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& S% {8 O8 I1 ^, z* @' Q- Q1 jpatches-own
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4 P* f. G1 L$ o, { intersection? ;; true if the patch is at the intersection of two roads0 s3 t2 i' ~& \4 ~0 D1 v! L4 \) J
green-light-up? ;; true if the green light is above the intersection. otherwise, false.7 \/ M: Y) I2 x1 E
;; false for a non-intersection patches. U( K* y1 `. G4 M; r
my-row ;; the row of the intersection counting from the upper left corner of the3 ~/ t {, O% f2 a$ z! W+ a
;; world. -1 for non-intersection patches.
8 `5 C/ D4 d; k1 h# X. |. q4 c my-column ;; the column of the intersection counting from the upper left corner of the
' ?! ^# E, u: V1 s6 C. _; D ;; world. -1 for non-intersection patches.& n# l/ Y% ]8 n. H% z0 C5 G. x
my-phase ;; the phase for the intersection. -1 for non-intersection patches.9 _( U1 @! {4 j9 e
auto? ;; whether or not this intersection will switch automatically.( z0 C$ N w3 f H" i1 a4 {
;; false for non-intersection patches.& Q4 H$ }0 k9 n- i& O3 `0 A& a
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;;;;;;;;;;;;;;;;;;;;;;
( w% N( C# R t6 h1 H;; Setup Procedures ;;9 T' Q2 d9 Q) Q% R! _
;;;;;;;;;;;;;;;;;;;;;;
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5 O/ V0 g! t( e, D4 Y" t;; Initialize the display by giving the global and patch variables initial values.
) ?. @2 Y: S8 |# o/ Q$ ]0 k;; Create num-cars of turtles if there are enough road patches for one turtle to8 ]1 ^, X, O% F% O L9 o
;; be created per road patch. Set up the plots.
. H" D" A- p5 M# W4 h0 G) t0 Xto setup- N& I& G; c& z
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables, ? L9 |& X3 C, b4 h
setup-patches9 s1 V( r7 V# X, r9 e" x
make-current one-of intersections6 R, ~4 e) r3 y* i& J6 a
label-current
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set-default-shape turtles "car"& H4 s% x; d. o3 b- v+ s+ g; [
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if (num-cars > count roads)# l- k: G/ G8 l1 L8 R& {. a
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7 J: c7 ^6 r5 e" U* V. R, T user-message (word "There are too many cars for the amount of "
2 b/ F9 n/ y; Z0 f5 [ "road. Either increase the amount of roads "5 _& M/ U3 k, D, A$ v
"by increasing the GRID-SIZE-X or "
5 f) p1 a8 P5 p "GRID-SIZE-Y sliders, or decrease the "0 N) f0 S9 x2 }" Z
"number of cars by lowering the NUMBER slider.\n"
6 J5 x) b, d4 r1 t# S: s) @ "The setup has stopped.")% A3 ?1 W! a4 i6 Z+ B! D
stop1 w1 u3 x- f6 b& P
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% p; O# N3 t+ X: y ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color g2 Z5 Q+ e6 T# f
crt num-cars% G0 k; D% M- X5 z: u- j8 ]
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setup-cars( ~0 L& f" U" e0 W8 b
set-car-color9 ~& |4 @9 x" h+ y$ b) {
record-data
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" S, V" j* `2 e+ d1 _ ;; give the turtles an initial speed
& `; S- N* R* c G! ~9 J ask turtles [ set-car-speed ]
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% y" s6 S& x- D. Z. Z+ e reset-ticks
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;; Initialize the global variables to appropriate values
# k/ t! P7 L+ b2 _to setup-globals5 B# n% q) r3 z3 v# c- I/ m
set current-light nobody ;; just for now, since there are no lights yet
$ I0 |6 v+ ` q [) g set phase 0
E/ C! I. l, u. P G0 M, O9 M set num-cars-stopped 0
' K3 W) h3 o$ J set grid-x-inc world-width / grid-size-x9 X- f, h! s; |6 l( ~! J3 n! U& r0 p
set grid-y-inc world-height / grid-size-y
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! M% S6 N, m- h( D ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; r. f% O; U, L0 }) P set acceleration 0.099
* o9 E$ j d4 z& cend
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+ R0 j ?* I& m- z;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& \2 F. t, _ _1 E( f$ B+ L$ \6 v6 i) x;; and initialize the traffic lights to one setting
: F" ~: P( Q% ~to setup-patches+ e. ]+ H: x7 h6 r5 I6 f( D
;; initialize the patch-owned variables and color the patches to a base-color
V x- n ?/ V. c ask patches
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0 v5 [0 F& m: X) h set intersection? false
' s/ M- u2 `. ]% T- ^9 [ set auto? false/ d1 d9 n# Q5 b
set green-light-up? true+ }& ]. D1 ]3 t6 N
set my-row -1
" E4 \8 e7 R# ^, u set my-column -1& J3 }& Y% D0 S( V4 F" N6 Q
set my-phase -1
8 N( F6 S# l7 \6 P! e/ { set pcolor brown + 3& d9 r' F9 ~& h: c3 |- V2 X/ V7 G
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- N5 w5 o/ U' E ;; initialize the global variables that hold patch agentsets
6 Z5 j: ~. x* J9 g' I( n m set roads patches with% F3 T7 p1 l _0 b9 _( @, l5 I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 M; V) a5 b% p, _7 H+ q" Q( `* u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" C5 F0 [2 T, K: n( L
set intersections roads with" u3 L4 r- T. ^. i' t8 N; Q* `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' ], _; o5 S# [7 \- N! r (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 `3 d$ ~% q8 Y) i N, N- ^- ?
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ask roads [ set pcolor white ]. O* }) |* g# G/ c0 G
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
; Y, i# H, p. a5 Q* D set roads patches with7 \1 [) r) U3 y% E
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 v6 Z$ g' \3 m% s# T$ { W
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 _8 c6 c1 i5 Q7 O0 J; 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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