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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。' @5 L* W+ V' U, y9 C6 S
netlogo自带的social science--traffic grid这一例子当中,2 @7 m" J& y. c, n. f
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction$ s# Y* U1 V' d" ~+ J0 E! q
grid-y-inc ;; the amount of patches in between two roads in the y direction3 _/ r& t9 d! D( F0 E
acceleration ;; the constant that controls how much a car speeds up or slows down by if
. Z' f& k, Y* B$ x6 S) r+ {# K V ;; it is to accelerate or decelerate
0 V2 ^& ]6 k t phase ;; keeps track of the phase" P6 x+ |; F, J2 W, S) [8 [
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 s! m. f8 H7 |5 a ^
current-light ;; the currently selected light
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;; patch agentsets
2 \& E' m( j8 D6 n7 l+ D intersections ;; agentset containing the patches that are intersections F$ a6 b8 d! i( w9 F4 @2 u8 B( H
roads ;; agentset containing the patches that are roads# E9 Z% j- U+ f% c1 l( v
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turtles-own# r. S" i7 j3 x. m8 v! r6 k
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speed ;; the speed of the turtle
( i) F# J \/ y- m" X5 `6 B up-car? ;; true if the turtle moves downwards and false if it moves to the right
, l' Y" _" M3 Q0 Y6 q: m wait-time ;; the amount of time since the last time a turtle has moved* |) I# W; J( D7 a" k' l
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
! S, S( }9 _0 Q! c2 g green-light-up? ;; true if the green light is above the intersection. otherwise, false.
+ i: J8 }/ |& P& r9 }% Z ;; false for a non-intersection patches.
9 u; n/ z$ P+ E1 Q! ^, U+ @( M my-row ;; the row of the intersection counting from the upper left corner of the7 F3 B/ A* d9 T. k+ Z
;; world. -1 for non-intersection patches.
! k! j% F1 z" X$ Y my-column ;; the column of the intersection counting from the upper left corner of the
4 h1 Q+ b& ]1 c ;; world. -1 for non-intersection patches.
( J" _3 k* O0 r3 Q my-phase ;; the phase for the intersection. -1 for non-intersection patches.
8 |. O' n2 `) E/ t. I. H/ ] Q8 E auto? ;; whether or not this intersection will switch automatically.
* ^. x% E$ y5 s8 g' [3 W N/ x ;; false for non-intersection patches.8 K7 \1 v3 s+ C; U
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;;;;;;;;;;;;;;;;;;;;;;
! q z9 b5 c5 `5 U( N' L5 _;; Setup Procedures ;;+ L- [6 [4 S+ y4 ?
;;;;;;;;;;;;;;;;;;;;;;
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% r: w( y0 `3 t;; Initialize the display by giving the global and patch variables initial values.+ R. J# @9 m2 k" I1 R1 w, q
;; Create num-cars of turtles if there are enough road patches for one turtle to: `& t7 i2 u, m1 g8 u
;; be created per road patch. Set up the plots.5 S f: j2 S/ l% t* v5 ~
to setup9 i* ]$ I4 k& m2 X7 q
ca
0 s/ |, ?7 n) Y# Y2 V2 c/ R1 w setup-globals
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$ ]' i, L7 f6 f: f ;; First we ask the patches to draw themselves and set up a few variables
1 b/ W$ e8 R% G& M7 M. j- p% Y5 { setup-patches
$ a, p( i( h+ z$ V% [: E8 Y make-current one-of intersections% C1 M' K' {$ z/ s+ m x. D7 i
label-current- h; Y; {, F- Z# E o/ r C
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set-default-shape turtles "car"* G7 i2 k! Z5 W; J
6 P% L% N. p. H8 ? if (num-cars > count roads)% T. a0 B' m9 x$ K
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user-message (word "There are too many cars for the amount of "
$ w4 Q0 A" w8 Y( L "road. Either increase the amount of roads "# \6 L* M$ f1 U1 e( P
"by increasing the GRID-SIZE-X or "
' L3 I' L3 l) N$ E+ q "GRID-SIZE-Y sliders, or decrease the "
% Y: e3 t$ z) a$ l# k "number of cars by lowering the NUMBER slider.\n"" B% d7 T1 L' X" }" J! e' K* G( u
"The setup has stopped.") c8 b4 _2 Q! `/ \0 }% h. R
stop
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( N' I1 }7 D$ T2 ^( P, a% ` ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
C" i& i) `' R& p crt num-cars. p/ j9 A: Q, k" b6 G& m4 l$ q( r
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setup-cars
}2 H. ]1 A* B, f$ n# U+ o set-car-color; r' r2 f: U: o/ J# C
record-data
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5 [/ V6 J5 {9 x( J2 W& J+ G+ p ;; give the turtles an initial speed
! f- x+ t' Y2 i: u4 C ask turtles [ set-car-speed ]6 k: w$ w5 V L) I1 J
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reset-ticks$ c, ~. t3 c( ~# h5 r
end
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;; Initialize the global variables to appropriate values ?& y7 H' N( \# o7 f+ R
to setup-globals
8 U8 r5 s9 P1 a& B, @$ | set current-light nobody ;; just for now, since there are no lights yet+ |% N$ B$ i5 Q
set phase 04 l4 v! U% T* u- L( w
set num-cars-stopped 0
6 n2 I0 D8 L' e- q! a J set grid-x-inc world-width / grid-size-x+ C7 O n/ E! U' r2 e- V/ n( B
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
& S1 W/ C: p' h1 U3 H2 M6 l set acceleration 0.099
9 H2 o# T! e/ Nend
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& j1 E$ O# V. M5 Y7 P) }3 J;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 s$ x/ r- k! e& H6 U;; and initialize the traffic lights to one setting# T! G- s W* L& c
to setup-patches
& `% ^2 I; y0 h5 P% F( @ ;; initialize the patch-owned variables and color the patches to a base-color
, b# o' K7 C0 A+ D2 ~ ask patches
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7 Q6 [3 f# o; ^8 j" Z. W8 { set intersection? false
* G$ _9 n% I0 }: ]3 ^5 Q set auto? false
0 b5 w" S9 j" \7 q. t1 o7 R set green-light-up? true, x+ I3 o5 e2 d- D1 K; B" p
set my-row -1
& r' Y/ H+ l( T6 o: Y set my-column -1
# o0 A: w5 o. M1 M) ^' T set my-phase -1
' I9 {5 @8 A1 [0 L( U4 w set pcolor brown + 3: ~; c+ x. ]+ Z6 \/ i! I- k( l
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# q+ b3 T0 {% o( [ ;; initialize the global variables that hold patch agentsets
* o! c8 F" c0 z$ }/ X set roads patches with
5 d- Y! ]7 _" ~- u0 n [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" F% k- r2 n+ {& X/ q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! _; v: v: X. |4 o, R
set intersections roads with
- M, c j( {2 R, Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! i$ D9 c9 N1 H (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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5 Y& f. Q* D: t% ~: K( ?( B ask roads [ set pcolor white ]* F/ Y3 Z I1 ?; v. l. b
setup-intersections& X/ i8 U s0 D1 E+ i& m
end
+ |3 v1 d1 W. v3 {% u. @其中定义道路的句子,如下所示,是什么意思啊?! i, d b, z/ ~2 ]8 ]
set roads patches with# }& ^8 |5 \% `0 Q8 M+ b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* [7 p' K; c$ z' y; B+ ~$ V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) N# y9 f( A( I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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