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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。
1 h! s/ K: H: O& @& U1 rnetlogo自带的social science--traffic grid这一例子当中,5 j$ r! \# V; }$ K
globals T- O* M0 p7 i) L2 P/ m4 c
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% h4 f1 z0 S% x2 E9 c, D grid-x-inc ;; the amount of patches in between two roads in the x direction2 [8 U5 D8 w% f7 C# r, |; Q, H
grid-y-inc ;; the amount of patches in between two roads in the y direction" ]+ P7 o4 i$ l, m. g
acceleration ;; the constant that controls how much a car speeds up or slows down by if V6 D2 B# k, D5 ]7 o
;; it is to accelerate or decelerate
9 {+ l& V+ O) n1 r7 t7 C; ? phase ;; keeps track of the phase2 @* c' R" o6 M
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% Q" R3 Z6 `4 r' R current-light ;; the currently selected light" T5 L' k; `( L" j8 k! a
+ V7 r) S [( Z1 X ;; patch agentsets9 q! w* C5 k/ M
intersections ;; agentset containing the patches that are intersections8 B( L; F8 f- A2 v
roads ;; agentset containing the patches that are roads
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turtles-own6 H. i0 O7 G. W1 [* h
[
0 i: B H$ Q/ h) {8 x" \) p- x speed ;; the speed of the turtle' b# \# F1 E( n \" H3 e- l
up-car? ;; true if the turtle moves downwards and false if it moves to the right
. Y2 F- _0 d( S4 w/ U- T wait-time ;; the amount of time since the last time a turtle has moved% T2 ?9 ^$ v, `2 p K
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patches-own
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/ D2 E; r% q2 ?+ w5 k5 x intersection? ;; true if the patch is at the intersection of two roads" H$ A3 l, R# \) U/ c9 J
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
5 Z- `- M2 @2 E, [ ;; false for a non-intersection patches.! K: z. i; s. |4 j! R3 r
my-row ;; the row of the intersection counting from the upper left corner of the6 t; ?% o: |% t0 f- L8 f3 R& e
;; world. -1 for non-intersection patches.
! y3 k7 _/ D% {1 H my-column ;; the column of the intersection counting from the upper left corner of the
+ k7 B+ \5 i- k0 d ;; world. -1 for non-intersection patches.
. o$ [7 u. D9 c- c$ _ ]: P/ o, ~0 E/ Y my-phase ;; the phase for the intersection. -1 for non-intersection patches.! g( w& v, K& O( B$ v
auto? ;; whether or not this intersection will switch automatically.! f/ G. f* [. Z8 V& c0 K' u
;; false for non-intersection patches./ p& f; h1 H! ]' f" D$ q
]
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;;;;;;;;;;;;;;;;;;;;;;
" d% ^8 D4 u6 [- ~: n# e& i;; Setup Procedures ;;
+ M. M) q% o" T# K;;;;;;;;;;;;;;;;;;;;;;5 N$ L2 O* `! I4 V& y. ?
4 t8 [, C F4 N; ]' r/ f;; Initialize the display by giving the global and patch variables initial values.
7 a9 b4 v* P* z' e;; Create num-cars of turtles if there are enough road patches for one turtle to: w& X4 x4 y0 A* u
;; be created per road patch. Set up the plots.& V* s+ L& A5 U( O2 _$ O
to setup
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( N* z* y; u: J! C: d! T setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
/ b7 A0 W- ~, \. M! [: c/ j setup-patches
7 ?' F- c% m% [) b& N1 a$ N4 v4 Y make-current one-of intersections5 d4 J. R5 K+ x( S2 U' {
label-current. y/ s: r! t. h. o! I: }& j* y
! p. b8 m3 [7 V0 g" J set-default-shape turtles "car"
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' m3 a) _3 J0 c* V- V5 w if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
* N( `* ?" \, x$ Q6 t0 W "road. Either increase the amount of roads ": z6 Y& M4 i# \+ F3 L$ E$ Z* N
"by increasing the GRID-SIZE-X or "# o# J( F+ {: n6 j- i; L3 m& d
"GRID-SIZE-Y sliders, or decrease the "
: |2 g' S7 g3 t "number of cars by lowering the NUMBER slider.\n"
: o5 l2 Y2 K, @* [4 t "The setup has stopped.")* c# J# A9 c( N4 b8 f, q
stop9 W9 Z" ^0 w$ a+ M& I, ?# i, | m. s
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* o" o5 Z4 I4 U* y ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 r" t: X& t* A: A
crt num-cars' U6 `: @# m6 G2 f _
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setup-cars& G% t8 L: t0 v9 O
set-car-color
* D: S# X3 u$ T1 ^ record-data
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;; give the turtles an initial speed
' _! M+ u9 E6 A5 T8 | ask turtles [ set-car-speed ]
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reset-ticks. x* m+ \1 D( b9 E
end
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) w& P; Q* A+ M- L9 J;; Initialize the global variables to appropriate values! w4 E8 }9 U2 x& y
to setup-globals
$ ?) r! l9 ^6 k# G, t4 K0 A* t: ~ set current-light nobody ;; just for now, since there are no lights yet% d# K U6 s5 d/ W" Y: X" L4 V+ d) x
set phase 0
) ^3 A( r1 A$ s; @8 P set num-cars-stopped 0# S! `; e5 i" _; K8 d
set grid-x-inc world-width / grid-size-x( \/ P8 e& e5 \& `
set grid-y-inc world-height / grid-size-y7 h3 V) f' W) C% a5 D* u" V" [
& i9 Y. F, o |& u4 r0 C ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
* b: U0 S- `; _& l5 w0 c8 b set acceleration 0.099
7 `+ v% h: v$ ?8 U2 t kend
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( F6 X! P2 S& U. \;; Make the patches have appropriate colors, set up the roads and intersections agentsets,4 `5 W, m# y y8 M6 w7 D- T
;; and initialize the traffic lights to one setting
* t4 D! o& c, u {6 vto setup-patches
7 \& }4 G; G2 ?, N ;; initialize the patch-owned variables and color the patches to a base-color
! L" T7 m& e5 v) ^0 e8 J; D4 L ask patches
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set intersection? false
6 S4 S4 D) [+ Z( x, l set auto? false) l( t1 i3 \$ F6 C2 w
set green-light-up? true
9 T- e# ?) j# b$ D# q5 @- B S set my-row -1) k. o1 e7 g& J7 `9 T T
set my-column -1
# f u/ o! c- Z1 x$ E/ g( { set my-phase -15 p _$ k3 g% T; [
set pcolor brown + 3
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% _! B& K$ o w# O ;; initialize the global variables that hold patch agentsets2 w( a) j4 D/ t" \
set roads patches with3 t1 X4 T* c2 S1 L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 w. o: W) D* @9 Q9 n (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 V6 T9 J/ n! N7 {1 a* Z1 y* X set intersections roads with( n7 H/ o: |/ V4 q: `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
5 V+ D. `' m% B' h1 E9 f7 m$ x (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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2 F7 c$ D5 p/ ]% U8 M ask roads [ set pcolor white ]
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& N w& v9 [+ cend
) s2 f7 b, | E) D其中定义道路的句子,如下所示,是什么意思啊?
1 b. U6 O# e- z. d) @! Q set roads patches with8 H: ?, f8 B, [: }! D, c
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% H1 e& W$ R1 |+ G; U (floor((pycor + max-pycor) mod grid-y-inc) = 0)], u" g. o9 h% {% x7 |( w `# i! z
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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