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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。
/ L; x- C Y6 M% g! jnetlogo自带的social science--traffic grid这一例子当中,2 r8 Y! N# s8 N( ~8 a
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
; w7 N6 t: h7 |( B% ` grid-y-inc ;; the amount of patches in between two roads in the y direction
; ]$ }" W2 x( \ E acceleration ;; the constant that controls how much a car speeds up or slows down by if5 v1 |( C. ]1 `- ~# y- p
;; it is to accelerate or decelerate9 t' u! y5 ^( O3 q3 Y4 q( R& }! B8 Y7 o! F2 z
phase ;; keeps track of the phase
( |% i1 K% G" S num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
; _4 l: H2 G% Q# k, w7 G O current-light ;; the currently selected light8 m3 x4 o$ A2 O$ T" e
' B& q: v9 k' w# F, }; |, \ H, P ;; patch agentsets4 K0 C @& S7 Y% l9 x* a8 H
intersections ;; agentset containing the patches that are intersections
8 _9 O3 J, @! ?& [% u3 f roads ;; agentset containing the patches that are roads& B( v: f3 B) {6 U
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$ K, o$ J6 D( Zturtles-own% m- `5 I4 Z. N$ J6 h3 [$ t3 o
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speed ;; the speed of the turtle
' J; Z- ]! U3 [& |1 O8 s/ C up-car? ;; true if the turtle moves downwards and false if it moves to the right
( H, m" H) l8 G5 L; T5 j wait-time ;; the amount of time since the last time a turtle has moved9 N+ Z- D- e- y5 O1 p" R) v, g
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) W. [; Q+ K. dpatches-own
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, T1 x1 p+ U8 V* { intersection? ;; true if the patch is at the intersection of two roads7 u0 T7 `1 l# U5 F6 a
green-light-up? ;; true if the green light is above the intersection. otherwise, false.- q/ [: ~6 W+ B# u" O2 c/ M
;; false for a non-intersection patches.
8 t) \ r& c k( a) x9 g5 A my-row ;; the row of the intersection counting from the upper left corner of the5 O$ ]- R& D5 S9 H
;; world. -1 for non-intersection patches.
7 ^) {2 I1 @; {' w6 z# v my-column ;; the column of the intersection counting from the upper left corner of the
) {1 Y# H; E; y" N ;; world. -1 for non-intersection patches.
, M4 J" \" ?/ N* G, u my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! i8 `3 v7 \, X7 m auto? ;; whether or not this intersection will switch automatically.
1 Z' m9 h. z) s ;; false for non-intersection patches.+ T4 O' g, A; w4 K' l
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6 w' [7 O) Q. ?& c1 d! e, e% u;;;;;;;;;;;;;;;;;;;;;;
O2 {+ q H2 m; j0 V) N;; Setup Procedures ;;
& e4 j5 I6 Y8 I- j' Y& a! n. e) E;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
+ T2 r, E# n& g+ v6 d' _;; Create num-cars of turtles if there are enough road patches for one turtle to
h* c. s6 R; |5 ~; \1 h9 v;; be created per road patch. Set up the plots. c7 A0 P; c# ? T, R
to setup
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# C4 h3 U. `) x8 h( K setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
, H8 Z! I& J/ I3 S: j& B4 I setup-patches
2 {: c4 a$ _+ Q: B, k6 [ {7 z make-current one-of intersections7 a* A! F# q# ?0 ?9 t0 g
label-current) h1 _* a4 `: E7 k
8 h1 [6 q9 C/ Y. x set-default-shape turtles "car"
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if (num-cars > count roads) h: _/ ^0 c7 q p# Q* g# i: }
[
, S, u% w3 Z+ p/ p% J/ n) f user-message (word "There are too many cars for the amount of "
% t. q. ]7 N* c4 ?1 b "road. Either increase the amount of roads "$ ~$ T8 O6 H4 F" d2 ~/ C& W
"by increasing the GRID-SIZE-X or "8 C" p |( E4 X* x, U- s' S2 Z p3 _
"GRID-SIZE-Y sliders, or decrease the ": b* C, I+ [9 h( q3 [: C
"number of cars by lowering the NUMBER slider.\n"
4 L) j, {: h$ C0 e, l' C "The setup has stopped.")
4 W6 J8 O! k. ~1 y: s stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( e4 F. y: `6 Q' ?5 ? crt num-cars
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setup-cars' k! s# Z1 \; N& l
set-car-color
; [' {$ c6 d. F8 s: i. M( `! Z record-data
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;; give the turtles an initial speed( W) w+ m5 w1 S0 w( J9 N
ask turtles [ set-car-speed ]- U: _' i$ S2 V5 `4 _0 L
7 D2 f7 ]* c8 _: n7 H. ]4 X reset-ticks" i: n5 ~( c ^2 N9 ?
end% T' R2 |) G; I X2 r
6 E; t# L" Q5 B;; Initialize the global variables to appropriate values( t3 _5 y9 I: r; J) X
to setup-globals( A- b$ f- L, I. l9 s. u! f
set current-light nobody ;; just for now, since there are no lights yet
. D" N! C5 n) D* r. ?: r3 T set phase 06 ^0 N/ O8 u: a7 g0 V
set num-cars-stopped 0
0 t1 A9 N- {/ P$ O& T) V5 B2 e set grid-x-inc world-width / grid-size-x
+ F1 B8 j$ T2 j% h 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) [2 g' h9 \1 I" O. N' l
set acceleration 0.099) D8 q8 z3 v3 V" I1 a% K7 {/ q
end! \ Q3 M! w+ J8 S
9 n" ~) Z. q0 d; X% ~! Q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,4 \' ?- V9 n; |! q4 r; }' |2 s
;; and initialize the traffic lights to one setting
, l* _9 [8 H3 \4 ]! Gto setup-patches$ L2 @5 A+ r% k* H% X- |3 Y4 M
;; initialize the patch-owned variables and color the patches to a base-color
; `# ~/ ]: J# z5 G. a" v$ } ask patches
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* ]8 V4 K: o y set intersection? false
2 A+ `5 D: ]* R set auto? false
% } b- r! `$ B set green-light-up? true- d# i! }( K5 K
set my-row -1
% m) l9 W- i/ ]' Q% }# p set my-column -1* {6 a7 K+ G+ }/ A- H8 M |
set my-phase -1
" R! o# J9 K- p$ N- F/ l6 Z set pcolor brown + 3! o2 F3 x; w, I* J% T" p Y
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;; initialize the global variables that hold patch agentsets
5 |6 [9 Q9 m& E6 l" X$ z# V1 @ set roads patches with7 q3 J7 u. P1 u% E% A# b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 M2 v6 m& ?" k+ S (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 J: x! X* _; \% p9 ^. {1 ~! Z& b set intersections roads with
" p3 c4 r5 R# r( g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- z; w$ ^) q8 ~# {4 I p (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]: \- ]+ a( `8 ~; Z; r
setup-intersections& c' t" X' U2 o
end
/ r' v: a+ F$ r# W$ U其中定义道路的句子,如下所示,是什么意思啊? r+ p3 i% [0 b$ I! B
set roads patches with
5 K1 Z0 k& a" ^ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- q/ [/ {% O4 \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. E5 z# o9 F3 N( t+ K, \( u) J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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