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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。
0 ]$ o# v: F' Y2 U& ~, l+ T' m, Pnetlogo自带的social science--traffic grid这一例子当中,
1 L5 P) h: _# p6 M4 w0 Kglobals. e" F+ h0 Y5 T4 N+ M0 c
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grid-x-inc ;; the amount of patches in between two roads in the x direction
$ p( M6 z3 x% _. J t4 G* j2 O$ F grid-y-inc ;; the amount of patches in between two roads in the y direction$ E+ F# c- s; s$ b1 l
acceleration ;; the constant that controls how much a car speeds up or slows down by if2 o3 B* _# E3 b
;; it is to accelerate or decelerate+ Q$ i _+ j% C; [
phase ;; keeps track of the phase( }5 x) Z* X8 G2 t5 F
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
' G% e4 S* l4 X% U0 a3 A8 i" Y current-light ;; the currently selected light
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3 i( D6 G: X( v$ ^! d4 e0 _ ;; patch agentsets2 W' W) G7 G8 U3 w# w
intersections ;; agentset containing the patches that are intersections9 x1 Q& v4 m l) z( x( c2 q
roads ;; agentset containing the patches that are roads
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$ v! d2 T0 o9 G, d- v0 x( `turtles-own2 }' Z& h1 B: C# N
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. \2 m. H7 q, b1 |( ^. j& Q1 {# H speed ;; the speed of the turtle
' Z! A4 ]9 ]$ Z# b R: i. F: r* P up-car? ;; true if the turtle moves downwards and false if it moves to the right
5 N1 g4 T) e9 L- K wait-time ;; the amount of time since the last time a turtle has moved
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6 ?! i; ~' h. Y& ?2 N4 F4 gpatches-own8 O, {2 c2 [+ n( c+ {/ z1 U; e
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% M6 |1 [% J: Z0 |1 h( z intersection? ;; true if the patch is at the intersection of two roads/ D4 n. W% t7 R$ z
green-light-up? ;; true if the green light is above the intersection. otherwise, false.! H/ j! ^' ?' i6 x! D) x
;; false for a non-intersection patches.! O0 ?1 l: U9 t& w% ?+ e' Y
my-row ;; the row of the intersection counting from the upper left corner of the
0 c' {. i8 @( b7 @' X+ F+ ] ;; world. -1 for non-intersection patches.
2 e# a) D7 T0 m5 ]7 U8 c my-column ;; the column of the intersection counting from the upper left corner of the+ M3 b* J1 P* B; a' P* {
;; world. -1 for non-intersection patches.
, Z& y( S' V( w8 W, q! o% ` my-phase ;; the phase for the intersection. -1 for non-intersection patches.0 M: T/ |9 o6 ?1 L
auto? ;; whether or not this intersection will switch automatically.
, _- r. u9 [) j) v& G2 w; d ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;" b, A) ]6 J8 E: I+ V/ a: T* M
;; Setup Procedures ;;
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- C9 l5 h4 M& f- u' c4 S# G;; Initialize the display by giving the global and patch variables initial values.1 l$ x9 @6 r5 D4 E' Z
;; Create num-cars of turtles if there are enough road patches for one turtle to# ~+ ]; _0 o) S. E; N$ Q9 `! W S
;; be created per road patch. Set up the plots.; F& P) i0 F7 h! b7 ^+ }9 E
to setup
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! ^# o4 m4 L8 ]: J9 Z setup-globals8 b0 f7 v! ~# h+ n) x, |
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;; First we ask the patches to draw themselves and set up a few variables
: U O$ [, _8 ~: ~# H0 T% i5 l+ x setup-patches
8 @) g. i: r- f* [0 W& `4 z. y. r$ I make-current one-of intersections- r0 I$ z1 E K) ? g2 b+ J; q K% f
label-current8 b# Q7 i3 B, B# A
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set-default-shape turtles "car"5 ]% `6 L9 O: T" W3 b$ }. V* `
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if (num-cars > count roads), ^& v8 Q3 E' r/ {
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, d' X' |3 [! C9 C% c$ w5 A user-message (word "There are too many cars for the amount of "
. i: Y& A# O) Z "road. Either increase the amount of roads "/ y' I* r) X6 |7 y3 A" l% S. O
"by increasing the GRID-SIZE-X or "
! j1 e: d' l: o. p "GRID-SIZE-Y sliders, or decrease the "
8 _$ ?) n. i1 @6 ~* `6 O "number of cars by lowering the NUMBER slider.\n"
\) }( d, G* z! E9 o4 L7 ]4 S% L$ }; o "The setup has stopped.")
& ?7 M" I% w# }: i stop
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- n; b6 S+ @2 K1 f' [- d E8 L ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color. t) ?& k4 J$ l9 `* B
crt num-cars
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( p1 e0 Z% w" Z: e, ] setup-cars
) P0 s% U/ U1 U1 Z set-car-color( @1 M% R. E9 p2 c& t. l- g
record-data' {; I5 k! ~& z
]
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1 f5 ] E8 u( T. [ ;; give the turtles an initial speed
3 ]! E. t) I/ w0 p! c- k ask turtles [ set-car-speed ]. ]2 ^7 z( |: _$ O( X! O
# Y- ]% h8 Y. b' B, G" b4 U+ H reset-ticks D) m3 N! A( h* k( D j) b
end
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;; Initialize the global variables to appropriate values6 @, _: v& a ~5 j9 O7 b
to setup-globals
4 {* H! o; i8 ~* X* W# q I3 c set current-light nobody ;; just for now, since there are no lights yet
* n& d5 [' S& W$ z1 e, J6 Q set phase 0
' r" l% q! f9 v+ D/ u2 L( N; b set num-cars-stopped 0
7 @* f, u! F4 ` set grid-x-inc world-width / grid-size-x
^# X1 ?. ]3 [( x2 ? set grid-y-inc world-height / grid-size-y$ w. p& S1 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# D8 j7 \2 }, @8 P9 H( a
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, k' I7 t6 s* l/ B7 \* d8 p;; and initialize the traffic lights to one setting2 V. u( N4 d4 t$ R1 @0 T$ Z( u! U
to setup-patches7 z$ R5 o1 K0 p$ f1 A# O
;; initialize the patch-owned variables and color the patches to a base-color4 Z, o T+ A, o6 K$ \: Q
ask patches
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set intersection? false
8 b! F3 ^; r$ {6 e( L: R% k9 z0 u5 S set auto? false
; m- a e$ r: x' P set green-light-up? true
! K+ k. l9 X6 Q' t0 |+ I& k3 j3 Q set my-row -1& Q F1 N( }9 F/ G
set my-column -1
6 q- S f7 K! ?+ E0 o set my-phase -1! d/ u' u3 E6 ~, i. ~2 F
set pcolor brown + 3
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4 p+ e S b' ?- i! R0 R) ] ;; initialize the global variables that hold patch agentsets
( w) Y6 ]7 H# N6 M set roads patches with
7 ?( K# _$ v4 p& X: f% D- }: n [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" K2 H; I' s! L3 `5 G7 P2 T1 B
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 k* x; i2 q0 \& s# u4 V% v
set intersections roads with
/ J; E8 A2 u7 d* X3 ^/ k [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 ?7 P. i2 a: P r. s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
. P( i8 t0 r% F9 C* r% N4 N$ H, o9 W setup-intersections1 w4 I9 W; p3 c+ Q7 q! l, T
end
2 Q" p _( P# D! K1 W/ y; t其中定义道路的句子,如下所示,是什么意思啊?
! W& B8 a* F1 Q, m set roads patches with
) |2 c1 q, [" T1 z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& D+ H* o9 y8 B& K) v4 e* ~3 m$ U (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' H2 u } r: S O: |, d5 D! K+ b2 _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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