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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。
: ` g3 O4 S% enetlogo自带的social science--traffic grid这一例子当中, O a" O3 \8 c8 R1 Q
globals/ [6 e& d& K; u/ ]
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grid-x-inc ;; the amount of patches in between two roads in the x direction( q- D, C. h0 ?2 y* K1 G
grid-y-inc ;; the amount of patches in between two roads in the y direction
* d! X& V" l$ \* @- Y acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 P! V6 L! g$ `# c ;; it is to accelerate or decelerate* h) O' r. w1 W/ n. c
phase ;; keeps track of the phase) p0 x+ ?% u) d% L$ B7 X
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
: L" m7 x* p2 u/ H2 y4 { current-light ;; the currently selected light. x( E }" @9 ]2 z q+ P
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;; patch agentsets5 [! h. {- d9 }1 X7 t) q3 i% H
intersections ;; agentset containing the patches that are intersections: w9 d6 Y+ g( @
roads ;; agentset containing the patches that are roads$ i2 C9 _+ Q! n9 B9 \$ q2 }
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/ H% m1 K. F$ [0 | s; uturtles-own) z& U5 A$ C; v' Z% X7 A; D8 h
[
$ Y+ S/ I( Q: n speed ;; the speed of the turtle
9 p: z9 e; [4 Z% r4 I9 v) L i up-car? ;; true if the turtle moves downwards and false if it moves to the right1 @: u+ k% O: d
wait-time ;; the amount of time since the last time a turtle has moved
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2 y# I7 g9 G1 j. K& `patches-own
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intersection? ;; true if the patch is at the intersection of two roads
2 m" b, a1 V6 E p6 i6 |& X green-light-up? ;; true if the green light is above the intersection. otherwise, false., T! n& \6 i! u9 f- k: M2 l
;; false for a non-intersection patches.; i( {9 O5 U9 S' T9 S
my-row ;; the row of the intersection counting from the upper left corner of the5 \" B+ b; N9 k7 S1 c
;; world. -1 for non-intersection patches.1 Z: M. S3 h6 ^- V
my-column ;; the column of the intersection counting from the upper left corner of the
/ g9 d! W( w: V) E$ W7 X' O ;; world. -1 for non-intersection patches.& E0 t d# E( V' z# z+ P# x
my-phase ;; the phase for the intersection. -1 for non-intersection patches." n* d2 ^) F, s& y8 m- I2 c
auto? ;; whether or not this intersection will switch automatically.$ Q7 u$ l+ I& N- x( s
;; false for non-intersection patches.
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X b9 D. u5 D9 u( w/ W;;;;;;;;;;;;;;;;;;;;;;
( z5 y0 b2 H( `1 R" Y0 K& }% ]0 I1 B;; Setup Procedures ;;
7 D, h. [! K" e. G;;;;;;;;;;;;;;;;;;;;;;
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( Y9 L# e! c+ W% T1 n# J) W4 q;; Initialize the display by giving the global and patch variables initial values.
- A4 a; x3 |3 l;; Create num-cars of turtles if there are enough road patches for one turtle to$ [9 T9 X( x, Z7 i
;; be created per road patch. Set up the plots.! {" F4 ?/ K: a( K8 ]
to setup
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% n" t- ~; q- l% A# K* Y setup-globals
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$ h8 J" Q& f4 l* f ;; First we ask the patches to draw themselves and set up a few variables
/ K: H- n0 \; k0 e3 A b- g setup-patches
; K! F* y% ?. A make-current one-of intersections2 D1 F$ x) Y/ z8 C; `: D/ r+ e
label-current+ I/ j s/ q3 v. k# p
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set-default-shape turtles "car"$ k( t2 `+ H1 Y5 L# j
i% @9 n \2 ?! a, R v+ e& A- N if (num-cars > count roads)* [) | i$ X* T( j7 i0 |0 X
[
U! O! X# C5 b/ G. F7 y8 e user-message (word "There are too many cars for the amount of "8 Y8 C. D' q! m% q/ L
"road. Either increase the amount of roads "
2 p; J1 ~. K1 c4 ~1 e "by increasing the GRID-SIZE-X or "
) ^( R% Z7 A1 D "GRID-SIZE-Y sliders, or decrease the "
; E2 f' I' u% ^& T "number of cars by lowering the NUMBER slider.\n", a: u" B0 n' M( y% ?: v" V
"The setup has stopped."), C1 l, [6 t1 f2 p+ y7 {( e
stop
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* g$ s! h1 J' d- S6 l g, v ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color- ] k* q7 L" `$ j9 l# l
crt num-cars! U( M) ^: @+ j
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setup-cars [( U7 ?) E- s* x6 N) F
set-car-color
0 y7 k, \$ M+ } record-data4 i: }% P7 v: H) s
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;; give the turtles an initial speed' {+ {& N b+ U2 ~* D, Q; K0 k! l6 v
ask turtles [ set-car-speed ]
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7 l8 _5 E1 k4 l1 `7 K H+ R- K reset-ticks
; c7 E/ A/ Q4 k, mend. B$ ]/ N6 m5 X4 i t& b$ R% _+ F
- q& K5 g, J9 P;; Initialize the global variables to appropriate values$ m, f; `/ v# r% M+ c
to setup-globals
9 V3 Q) H k1 p* W( t set current-light nobody ;; just for now, since there are no lights yet; |4 H" z6 z0 x) a7 F; R$ E4 X
set phase 0" ^& l7 g6 z, y; m9 W# _) X
set num-cars-stopped 0% i3 g0 \, C. s3 @0 E
set grid-x-inc world-width / grid-size-x/ c& o/ S0 L, L$ S
set grid-y-inc world-height / grid-size-y% A& H$ v% Y1 c
+ r3 R8 x, R& s3 l- { ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary E. A+ w; E$ t5 Q+ h; V% w
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% g7 Z+ `% i6 [2 f: @
;; and initialize the traffic lights to one setting
1 Q0 u, i: a* u% G. A: _to setup-patches% g8 E3 T% i; k
;; initialize the patch-owned variables and color the patches to a base-color
2 ?% F+ s1 p% W" F6 y& | ask patches
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. l0 M4 d# N R, X set intersection? false6 J' M2 ^& E) I9 {
set auto? false( |; [* S2 q" g* n& c' E5 y
set green-light-up? true9 j E' ^0 G0 R9 J M1 a% h! m$ {
set my-row -1
5 U5 j/ B" { `* v set my-column -1
- H& Z) i+ h/ z% K [ set my-phase -1$ B6 L/ \: Y/ @" S7 @ G
set pcolor brown + 3
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- q8 m6 U' U- g# M* g0 A ;; initialize the global variables that hold patch agentsets/ H5 v2 Z: b. T& T* E
set roads patches with
) t' D4 y7 x& N: F, k9 A8 Y, Y% Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- c1 c) k/ Z+ I9 Z/ j9 w+ s' [& K (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: r. _' o: D4 ?: P! u& A
set intersections roads with' `7 I( e; }1 G7 p& Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 I% ^. n2 r/ S. x3 C0 d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. o( e- L: ~, y7 U& m
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ask roads [ set pcolor white ]
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1 @" N6 t4 w9 D) C% mend
5 `2 [5 q% n9 A9 R其中定义道路的句子,如下所示,是什么意思啊?8 e% A w1 W& R' P+ |3 _, O
set roads patches with
- R+ ~' S4 l7 A& m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, R& Q/ I! ?: G4 _# Y( v, }6 c (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ d9 h) J2 U0 B) r: W1 ~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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