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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。
) J+ O a" r3 v( O8 u7 A; Xnetlogo自带的social science--traffic grid这一例子当中,
, h( D4 P3 k0 s, hglobals/ m( [1 m) X. v+ Z* B! O X$ ~
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( x' M/ @& s: y% e grid-x-inc ;; the amount of patches in between two roads in the x direction; H* w- b# V" J7 Q4 X* j
grid-y-inc ;; the amount of patches in between two roads in the y direction6 p1 Q. X1 ^2 ? s; b/ O
acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 ]$ n) g1 D4 A4 T# L ;; it is to accelerate or decelerate
% n: f8 S5 D, t: X phase ;; keeps track of the phase
- V& a* e1 ]( d2 u num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 }, g2 H8 f" v: ^
current-light ;; the currently selected light, x1 ]) {' [) H
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;; patch agentsets
( H+ Z& m- ^$ n) N intersections ;; agentset containing the patches that are intersections+ F" T1 }+ M: M/ S: `: h |
roads ;; agentset containing the patches that are roads! B* X7 u8 e/ h- p* z4 S
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* z- {" u& l8 P' eturtles-own
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3 p. e+ t% d: e! X+ r* P speed ;; the speed of the turtle
0 G% f+ v( r2 @3 r0 L up-car? ;; true if the turtle moves downwards and false if it moves to the right& a' Y/ v, [6 x5 L& Z5 E9 q/ N/ ^
wait-time ;; the amount of time since the last time a turtle has moved1 Y3 p. u% q( s: q5 V* Y
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patches-own* i# [6 g$ V2 n- B; W9 A
[, M- e2 r' N7 R5 k; D" F {
intersection? ;; true if the patch is at the intersection of two roads
o/ ]3 ]9 d2 \0 d& r7 }& @) J green-light-up? ;; true if the green light is above the intersection. otherwise, false.& R' G. y# U" N8 c( E
;; false for a non-intersection patches.
6 k; W. p9 p$ K3 \2 l+ o/ q my-row ;; the row of the intersection counting from the upper left corner of the7 o' v3 g$ w- |6 @
;; world. -1 for non-intersection patches.+ l' N; F3 o* M' ~$ X7 {( z" a
my-column ;; the column of the intersection counting from the upper left corner of the
g$ ?! l: b+ { h) o2 O" s; k) d ;; world. -1 for non-intersection patches.; }. V5 H4 ~ V
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
# @1 c/ a; s8 w/ \' G8 s- d auto? ;; whether or not this intersection will switch automatically.* P7 k- h _0 _$ W Y& I+ G& r
;; false for non-intersection patches.
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9 R) N! E6 Z R3 }3 z1 H;;;;;;;;;;;;;;;;;;;;;;
5 r4 ?* [7 x: W, S) G) S. u# Y4 \;; Setup Procedures ;;: w- A8 F* P! H2 T7 k- C6 ^
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.1 `# `& N2 Q: O" J4 D
;; Create num-cars of turtles if there are enough road patches for one turtle to7 x7 A, E) t# R u
;; be created per road patch. Set up the plots.
1 D3 m2 c% }- U uto setup
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/ j7 `& L( z0 ?6 Y. P( y. G setup-globals
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! T, k( T, o# z6 a( P5 R ;; First we ask the patches to draw themselves and set up a few variables1 b3 {, w$ M2 z/ s* }5 ?
setup-patches& c6 n1 N. D3 B$ H0 X9 I
make-current one-of intersections7 k8 m6 \' g' U. `! j, _
label-current( J8 w$ b0 X$ c" C4 @( b. A) P& i2 V2 i
! e4 \( ], `9 y r+ e) t0 H set-default-shape turtles "car"
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2 [1 c3 w/ w$ Z- n. G% l; N if (num-cars > count roads)4 V5 x$ U5 ^0 F. { b
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user-message (word "There are too many cars for the amount of "8 S d- L, @$ t7 d! N
"road. Either increase the amount of roads "
9 v: W7 c+ ?- i/ M/ k7 t2 i# C "by increasing the GRID-SIZE-X or ": ~( m6 W6 N) O' B7 P( e$ I
"GRID-SIZE-Y sliders, or decrease the "
6 K1 |: }& N, X, x3 _% G "number of cars by lowering the NUMBER slider.\n"
\6 U1 I3 \& f! j% G" G "The setup has stopped.")8 S5 l, w$ P9 v6 A6 A
stop
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# o; k8 Y+ S9 _& t; | ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
9 l) ?3 L+ W+ Z, ~9 Q crt num-cars
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7 ], [' A6 g' R" J$ [! ?6 j5 o setup-cars
4 |7 V: Q: _ f. y* o& i set-car-color4 w8 O8 N& {* E0 R: c' u
record-data8 n) l/ x# k7 e, t
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;; give the turtles an initial speed& L% I$ o! j/ b D' o; Y! f
ask turtles [ set-car-speed ]
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2 ]' n3 k- Y' g/ \; M reset-ticks
4 u0 C4 p$ I7 H: c/ H Q' gend
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;; Initialize the global variables to appropriate values
: N. F1 [. }1 t; Rto setup-globals
) [7 u$ n; @4 A# H set current-light nobody ;; just for now, since there are no lights yet7 h" ]+ w5 m5 U' K
set phase 0
% k, B6 x* [! K! X; E9 m set num-cars-stopped 0- S- W" L( Z V5 B3 K
set grid-x-inc world-width / grid-size-x. Y# x8 g2 X$ J0 v; B" v& q
set grid-y-inc world-height / grid-size-y( A: N/ i4 D6 n) e
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; h7 y: z) Y- u, @. ]/ w set acceleration 0.099! X$ \% \$ n, r }9 U3 J- ^
end
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' M9 G% t5 f6 M7 a# A;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
3 ~1 Q- S6 ]. _;; and initialize the traffic lights to one setting. L5 w: l" p" ]' ~5 R
to setup-patches3 v& _ o( w4 X) z5 {# g
;; initialize the patch-owned variables and color the patches to a base-color
9 {; q3 J+ i8 ?4 O: _5 r/ g. B ask patches$ R$ c! i7 a; N+ q+ Z( e& Z6 e& W/ W9 F
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set intersection? false- p Q. ?( B. l8 H! V V
set auto? false
+ ]. r' _( y0 C% b; C set green-light-up? true
7 [8 y0 w0 _* n& U% L set my-row -1+ o0 P5 r# h6 B* g9 O ]& i1 F
set my-column -1; c$ r {/ n4 v: O! L' l% R0 T' Y
set my-phase -1( t4 Q, c, O7 `% o
set pcolor brown + 3" c9 ~7 n3 r& r
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;; initialize the global variables that hold patch agentsets
* p: z* A3 `" [2 `- \- @1 E7 R set roads patches with
# v2 o2 E8 f6 {3 ~) Y. A& { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 }: L! s2 ]3 |* l3 U$ I0 C. K3 X7 ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 _1 E1 b: C( |: e" C% y
set intersections roads with3 X* i1 U5 H* E4 ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
9 j. b0 I) b' G0 P, y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]' A) D8 z% H \$ `) J6 N; B
setup-intersections
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/ }7 O: ]2 I; ]7 a$ q' R4 X其中定义道路的句子,如下所示,是什么意思啊?5 X9 D1 _* R; @: q
set roads patches with6 i0 s# d1 h6 v8 G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 {! B' w i3 k& ^) B4 h (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 L8 b$ S& `2 j, b' h0 S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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