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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" C' |$ t. |# y: ~netlogo自带的social science--traffic grid这一例子当中,
2 g4 K0 n4 f# `globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction- w5 p4 n _" S \% I0 E
grid-y-inc ;; the amount of patches in between two roads in the y direction, ?2 y# e3 G- r3 N# Q
acceleration ;; the constant that controls how much a car speeds up or slows down by if# v. F. s- A |2 ~) ^+ d* y* R
;; it is to accelerate or decelerate! g3 `. b: C; C: n8 p' r
phase ;; keeps track of the phase
* A) U3 e( Z- b1 m4 M4 Q( [, C num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 i1 e: W/ |8 U3 H- W2 {5 B current-light ;; the currently selected light
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;; patch agentsets% ]# ^% A; l2 b; S' h2 f4 z: X
intersections ;; agentset containing the patches that are intersections- c; K- r" F* f/ C) A
roads ;; agentset containing the patches that are roads- n2 ]0 ]1 s1 I* N8 W
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turtles-own. Q3 I- j8 F( q% e8 @! g: z7 B
[
! H7 R2 O, z9 a speed ;; the speed of the turtle% b" z, ~1 i# Z$ B% i( W) d% I
up-car? ;; true if the turtle moves downwards and false if it moves to the right/ D- i- o6 h. R' `& X
wait-time ;; the amount of time since the last time a turtle has moved
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4 w: ~+ c) O% i/ e& w$ ?' n: `patches-own
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! v# u# U1 l; E0 m: A# }: @1 f intersection? ;; true if the patch is at the intersection of two roads( G' h: m1 s% w! c9 F
green-light-up? ;; true if the green light is above the intersection. otherwise, false.+ i2 `( Z9 u# m8 K6 e" Z0 M
;; false for a non-intersection patches.
7 }2 Y- {7 d0 h; } ~ my-row ;; the row of the intersection counting from the upper left corner of the @/ B: n- K. Q& {2 H) V9 e
;; world. -1 for non-intersection patches.
+ t* N y# h3 v# x6 L; d my-column ;; the column of the intersection counting from the upper left corner of the' W: U. E# J# |2 [) E( m) L# e2 N% M
;; world. -1 for non-intersection patches./ J0 F8 ^. o( j. w: o' N( N
my-phase ;; the phase for the intersection. -1 for non-intersection patches.8 w' Z6 {. o3 h$ E: T* @/ S
auto? ;; whether or not this intersection will switch automatically.
$ X! p) N. k- e& k5 e1 X% v ;; false for non-intersection patches.6 W3 m8 P2 K5 S4 P
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;;;;;;;;;;;;;;;;;;;;;;' b3 T% @: a/ b
;; Setup Procedures ;;
' S p4 b& E( A6 K% y' R" H;;;;;;;;;;;;;;;;;;;;;;6 n5 s8 H' W' R5 x: C0 k3 ]
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;; Initialize the display by giving the global and patch variables initial values.0 f. k# y$ }6 H, Z
;; Create num-cars of turtles if there are enough road patches for one turtle to
C% m( n* `# s. W;; be created per road patch. Set up the plots.4 j0 F$ x: x3 |0 H# c8 ^6 P
to setup5 v( S( y, l% w& P* s
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setup-globals: H& H. V7 d# N# ?4 J" ?. [
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;; First we ask the patches to draw themselves and set up a few variables
- G9 x0 d2 k0 [- L$ u setup-patches# S, y/ ^5 Q& Y3 U- `7 I
make-current one-of intersections
( [. [# n- a+ d3 Z label-current
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% C9 j, V& K: ?1 Q: W: d) G, A set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
2 E3 Y; v6 h+ _; o* [ "road. Either increase the amount of roads "
( r* W1 n/ O4 y5 Y "by increasing the GRID-SIZE-X or "# W0 k$ j+ [1 {% D
"GRID-SIZE-Y sliders, or decrease the "( W7 K: a' _2 E1 H7 O0 d
"number of cars by lowering the NUMBER slider.\n"
" l( v) W9 Q; P "The setup has stopped.")
- o6 w6 }' @3 D: D( Z stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& E; f; `# D4 k( R& s0 {+ v
crt num-cars
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setup-cars
; G- C% \4 e, v" t3 o set-car-color, E* l9 `7 c* h& n9 E2 q* H' n
record-data
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;; give the turtles an initial speed
+ Y. p% B) J* A ask turtles [ set-car-speed ], ~6 B+ s& B. \) z. \; g
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reset-ticks
* u6 ~6 _ X$ Z5 B$ b. Y; }end
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;; Initialize the global variables to appropriate values
' k; p* H& u1 p9 X; Eto setup-globals
* u2 O4 P6 Q+ ^; y2 W6 H set current-light nobody ;; just for now, since there are no lights yet: z: ?4 }3 O3 b5 B- n6 Q
set phase 0
8 I1 i6 {& N+ U- T8 a1 _2 q set num-cars-stopped 07 Y g8 E0 i9 ~- O8 e1 ?# C
set grid-x-inc world-width / grid-size-x* ^5 Y3 h& t6 {9 u
set grid-y-inc world-height / grid-size-y4 J- K; _$ w: e6 N
6 W2 o2 S6 q8 K: s. l' w ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 }: d1 y7 D7 P5 x/ e' W( [ set acceleration 0.099! p- i# i7 y- O0 o8 `. g
end/ M- W, q6 d: E7 n( i* ^1 L u$ n
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, o6 u1 a# I. L0 N- |* P ~8 ^4 m
;; and initialize the traffic lights to one setting$ i) \+ R6 M# Z( s7 w# \
to setup-patches
1 x+ s/ v) I% m' s( f ;; initialize the patch-owned variables and color the patches to a base-color
/ F6 H, ]3 y0 v+ ^+ ^ ask patches3 X1 |! C W, o$ v- `7 m4 q+ d
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set intersection? false3 I4 {% i* Z7 m7 T
set auto? false; g+ z9 i k! A* _+ _. X
set green-light-up? true
b* o0 m4 t" Y2 f7 S set my-row -1
' Y B* ?+ \ n1 g# e* [ set my-column -1' r1 M( o3 p6 {& k* f [
set my-phase -1
8 f; L8 V7 w+ q set pcolor brown + 3: f. I* u- G0 f3 y, F, A) ?+ s' A
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;; initialize the global variables that hold patch agentsets! `: y" ~; z7 ?* C3 h
set roads patches with6 X% [) R5 t6 o3 t
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% N- i$ E; t B* N6 j; B
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 |: `% H" }/ S2 H9 I0 I set intersections roads with
/ C3 E; t1 l6 L) D6 j' o- g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 u6 g: S4 l9 F& Z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]% a! y- U: y/ D& A# [8 h. d* k/ l
setup-intersections
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6 C- d( I3 F6 Q9 m其中定义道路的句子,如下所示,是什么意思啊?
& }( b9 O; e$ f" [9 l set roads patches with
8 b" y% }, N' N [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! `! C- C% D* n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 H2 L- b# Q' X5 q: q
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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