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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 p7 U! N3 H0 H( M! A1 m* c
netlogo自带的social science--traffic grid这一例子当中,
- r& j1 y3 o5 P9 e* }6 |, Xglobals' v3 \/ L) j" T" J/ f3 _
[
- _0 ]+ N% _8 r" ?- h( w grid-x-inc ;; the amount of patches in between two roads in the x direction Q# K9 D4 L( ~/ S* A$ N
grid-y-inc ;; the amount of patches in between two roads in the y direction
' m/ Q% A1 ~7 j \- c* I( M- x acceleration ;; the constant that controls how much a car speeds up or slows down by if
+ X, y6 l6 a2 J6 e ;; it is to accelerate or decelerate- n- B R" M) s! K5 y- u
phase ;; keeps track of the phase
* k7 w+ w6 j4 Y. F, [, G num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure8 w1 a* P, @3 V# T( n
current-light ;; the currently selected light
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1 @0 c6 @- M/ e- _1 e v ;; patch agentsets2 }7 a, e1 ]+ w8 R# B. o. O8 V7 K& w
intersections ;; agentset containing the patches that are intersections6 ~ ]; _% v5 a& g3 X' p4 p, V
roads ;; agentset containing the patches that are roads
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" o! i3 E# n" r$ B( q/ r* eturtles-own- D5 a9 ?5 b- `
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, K' r# _' Q' q$ m0 K2 v0 i speed ;; the speed of the turtle
W' C0 S+ y! j r5 \( A& u9 G up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ W1 d5 M' ]9 k* A2 O wait-time ;; the amount of time since the last time a turtle has moved) G& O0 u7 \9 E6 \! G
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patches-own# Z. _1 T4 j5 ?3 y+ b+ @# o9 E
[
, @% R& Z! w/ e, X intersection? ;; true if the patch is at the intersection of two roads/ f7 x6 a9 R$ h+ j( a; d
green-light-up? ;; true if the green light is above the intersection. otherwise, false., H; j7 Z4 U, V
;; false for a non-intersection patches.
5 v7 t8 V8 S) ]1 u; D p% L my-row ;; the row of the intersection counting from the upper left corner of the
; S2 f$ a( l) b) c: [& P! Z0 f/ ` ;; world. -1 for non-intersection patches.+ Z% U# i2 g/ ^
my-column ;; the column of the intersection counting from the upper left corner of the1 w% J8 v! q4 x7 V: v
;; world. -1 for non-intersection patches.* h4 K$ [. k, w* k: D4 O2 j5 [+ _
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
3 K2 {8 j2 u" q* j% R; { auto? ;; whether or not this intersection will switch automatically.
, B0 x* j& m9 g ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;" y; ^5 T. D( O8 }
;; Setup Procedures ;;! ~2 R! H0 v; P# d
;;;;;;;;;;;;;;;;;;;;;;
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/ ^- G8 y; X% X# S;; Initialize the display by giving the global and patch variables initial values.
Z, v0 ]2 T" L# s;; Create num-cars of turtles if there are enough road patches for one turtle to: ?3 R; Y; S- s* U, U
;; be created per road patch. Set up the plots./ t$ k) F& ?/ B. W/ {$ ~: ~
to setup# o% H( u' q" s7 V! F
ca
( [4 C3 X% _4 O setup-globals
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+ D8 E) o& }( h) P; D ;; First we ask the patches to draw themselves and set up a few variables
: J3 c- F. _2 B# h! i0 Q2 d setup-patches
* z% T' J. {4 G8 y/ d9 M1 S make-current one-of intersections$ W" G ^) @3 H3 k- I
label-current- k% ?3 Q' w7 D' f. Y
+ m* K) A' f0 B; ` set-default-shape turtles "car"
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if (num-cars > count roads)& a g5 z0 p8 b) R
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user-message (word "There are too many cars for the amount of "
R- v0 N& h9 { "road. Either increase the amount of roads "
8 T" o$ Y2 Q* u/ }( v6 \/ N "by increasing the GRID-SIZE-X or "
0 R3 w9 I$ e0 X "GRID-SIZE-Y sliders, or decrease the "
$ V W5 K! p- [; o f! `8 n8 R "number of cars by lowering the NUMBER slider.\n"2 _: v$ {$ R# ~! K
"The setup has stopped.")
) \6 y6 P2 |% E( O& @ stop/ y4 d7 c5 \' ?& l5 X( w, ^
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! l1 C7 w5 C: l; n
crt num-cars
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setup-cars
+ C* F: Q# U B4 y set-car-color6 D6 b* o2 z' |- }$ X
record-data7 b; a' b; y3 L g# K
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;; give the turtles an initial speed
5 W8 B ^+ I) z- b, C1 F/ a2 R, x" l+ p ask turtles [ set-car-speed ]
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reset-ticks0 _3 s: p1 n+ `; Q+ G1 X% G3 D
end
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;; Initialize the global variables to appropriate values
) _2 H5 z6 w P t+ Yto setup-globals/ Y3 h3 F. a8 o6 b5 i* X3 h, U* Q
set current-light nobody ;; just for now, since there are no lights yet
, B7 _5 @1 R3 C( @, n2 g% w set phase 0/ L* w% V1 o w6 i
set num-cars-stopped 0
- S" Q3 d- }- b |* F' x4 a set grid-x-inc world-width / grid-size-x
* g2 `( g# H* y+ b( g' B3 w set grid-y-inc world-height / grid-size-y
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+ @" O6 [% C' Q& a ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary; m. a3 [; S5 ^
set acceleration 0.099
& L1 N/ _ i: t b2 uend" ]; a2 V6 O8 e; x9 X0 e3 E/ F
) d# J2 k# t& u, N- b! ^;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# |& `- @, j: q$ L9 ~, Y, [;; and initialize the traffic lights to one setting
- U8 i9 A/ w& x, e" Nto setup-patches
$ y! X9 d; K, S: c ;; initialize the patch-owned variables and color the patches to a base-color
$ }0 D e m0 S( L5 ?) Y2 O ask patches
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- o$ F/ z8 x: J set intersection? false
! H/ k5 `! L4 y" m: | set auto? false; G' ~4 f0 S- R6 D( P
set green-light-up? true. ], n* I* J, m
set my-row -1
w8 A( P- r3 e4 d set my-column -18 h K4 I; i% u5 G: N
set my-phase -1
& j' ~! F+ u C7 u7 ?" u set pcolor brown + 3
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& O4 ?# ?6 l, R# O ;; initialize the global variables that hold patch agentsets
% u: m& Q5 g4 [' q% U set roads patches with
& D' A" ^4 }$ S# R3 `6 A5 i [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ Y2 L2 C; y1 Z$ i" O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
S. z! r! ]7 [ set intersections roads with
% x) p( g1 t% ? ?% ?8 y0 k [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 p0 t* H1 Y0 C2 w (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]. d* h+ @2 J; W# S
setup-intersections7 M6 [ L/ x7 M0 E
end
3 f4 r& W Q. }, e3 r6 k! G其中定义道路的句子,如下所示,是什么意思啊?( K& G6 h# D0 j& I& F$ m
set roads patches with
$ k# J+ }; K/ Q% b2 e- e7 i) J% i [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ E* J' z2 W9 t$ h (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; f) G4 d- l) _3 Y3 z/ B
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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