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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。6 ?9 k3 G$ S- l$ G! Q
netlogo自带的social science--traffic grid这一例子当中,+ ^, H: H7 w; w- P/ N9 k
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction: H7 v8 M U9 M! A6 `+ X
grid-y-inc ;; the amount of patches in between two roads in the y direction3 P+ |' @& j- _, E0 b
acceleration ;; the constant that controls how much a car speeds up or slows down by if
& _7 _, ^" E2 m0 x" K* M! D# z) V- T ;; it is to accelerate or decelerate
$ P; l C) [- ~+ a0 X phase ;; keeps track of the phase8 q m, X) K- R* Y
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure; N( A# r+ n, w m! @
current-light ;; the currently selected light4 E, {: U* N- A, m2 S2 l S( P
" T: J# e+ } J: x0 n" m1 f ;; patch agentsets
1 f5 Q1 W7 j! C' e* B, ^- O intersections ;; agentset containing the patches that are intersections
# M) r! h3 [% K; e# D roads ;; agentset containing the patches that are roads
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turtles-own
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: z( E0 g, o) h1 ?5 I speed ;; the speed of the turtle7 g# ^' [2 ~7 f d, o9 ?; C
up-car? ;; true if the turtle moves downwards and false if it moves to the right
# G# M$ C+ I" }5 Z& i! O wait-time ;; the amount of time since the last time a turtle has moved
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patches-own$ Z L, s& e, |
[
j7 h6 y) F- ]# t" d4 z intersection? ;; true if the patch is at the intersection of two roads% ?. @- C V* u8 g3 l, L
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
5 U! S9 Z! ^+ ?4 M; P# F) t! y9 T; A: B ;; false for a non-intersection patches.+ A' a( n4 T/ O3 x
my-row ;; the row of the intersection counting from the upper left corner of the
& R4 J/ y4 [( o/ t& ?, ^' W5 C4 b ;; world. -1 for non-intersection patches.- z$ r. t6 V1 Y4 x8 L
my-column ;; the column of the intersection counting from the upper left corner of the4 B, R8 c7 @7 N. l0 Z% r9 n4 [
;; world. -1 for non-intersection patches.# W6 L: b: s( H; G6 ?6 |3 z/ I/ |
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
) w1 Z3 A1 H1 N auto? ;; whether or not this intersection will switch automatically.
! }7 s4 U3 Q/ e& g! l ;; false for non-intersection patches.. R+ g4 G6 H* k/ i$ `
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;;;;;;;;;;;;;;;;;;;;;;
( y3 w" O2 r3 f" u' Y. {" b;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.+ F$ G- |1 }8 X5 {" B
;; Create num-cars of turtles if there are enough road patches for one turtle to2 [: h0 x1 S' v6 B4 |7 w8 {" A
;; be created per road patch. Set up the plots.0 p; i: @ q+ D9 `/ F! t
to setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables" G- S C" E( v1 y
setup-patches4 p9 p: ^' H: m S) S k
make-current one-of intersections4 { e' i. @. {* d* a
label-current4 y0 S4 }( l% Q! p9 |
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set-default-shape turtles "car"
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9 T' G% A4 W* v% |$ z3 }3 ` if (num-cars > count roads)$ n3 `2 A4 | {0 P
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' R4 o0 d, I" c+ V# y+ W user-message (word "There are too many cars for the amount of "
$ ~5 o0 v; Z8 Y/ l1 N3 Q) ^. o "road. Either increase the amount of roads "
( P, c( y- M: c+ G, D0 Y q "by increasing the GRID-SIZE-X or "
0 a: a" y+ S, y "GRID-SIZE-Y sliders, or decrease the "
+ i* h' E# w8 R3 W5 A6 _0 `+ K "number of cars by lowering the NUMBER slider.\n"% ~( ~0 d5 |4 b9 w. \
"The setup has stopped."); S% d: Z, C* r) L" R- |
stop
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5 v7 W4 w. @5 v% y5 u0 I ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 K* S; Y0 E3 }
crt num-cars( g8 \) p7 N+ @& R5 e d- `
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setup-cars; M u0 l& k- ]; F" ^+ f+ S% N, @5 @
set-car-color* d5 Q0 t+ u5 y/ L
record-data
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;; give the turtles an initial speed
4 J5 v2 V8 C& M( w ask turtles [ set-car-speed ]1 V7 D' n$ v; F# {+ W" p
6 n5 Z+ }5 _6 s" y; q reset-ticks; \( f8 l4 E" S" s' d' L
end
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;; Initialize the global variables to appropriate values) c' b* x2 }% |% @9 r8 \2 G$ o
to setup-globals
; [- P1 F$ u6 Z% K set current-light nobody ;; just for now, since there are no lights yet
; X4 o; N$ Y p8 w set phase 0
# b$ H: ?$ d2 y0 T set num-cars-stopped 0' f* _! f- e, Q, i
set grid-x-inc world-width / grid-size-x8 z7 K+ c: t) w. s" @
set grid-y-inc world-height / grid-size-y
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. j/ P% s; t9 x3 y8 u! {! Z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. T4 I/ l1 ~3 @5 T0 Q1 \5 Y
set acceleration 0.0994 W, p: u# C1 ]2 `0 O% k
end' |6 T( S3 M0 s$ n4 ~' X/ G
( s/ \+ d/ W/ G( k: h;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' D) ^6 B5 z h1 Y
;; and initialize the traffic lights to one setting- {# l' j5 p# T5 z T5 d" e, W. d& W
to setup-patches7 g1 n9 _9 j* `) u1 V
;; initialize the patch-owned variables and color the patches to a base-color: ^# Z# n8 K9 k* U9 {+ w
ask patches5 `9 ~: h/ ?% P
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9 A4 n6 R# P3 _1 w3 T) a set intersection? false! O+ o7 ?- y7 h6 \( x' m
set auto? false
, T! f$ ?6 \+ n0 D, `- z$ e set green-light-up? true8 ?: w) c8 k( `. L
set my-row -1
- c5 w; }0 C; i1 ]& @3 j3 y3 @5 [* r set my-column -1" R8 ?- ]6 Z7 b0 Z8 a& h
set my-phase -16 j' {* m7 ?. h& `! S& q5 v
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
& M) J2 H9 |' `8 c/ B# w8 J set roads patches with: p6 P6 H5 X5 f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' g4 v3 t( `7 U! I$ {1 Z ~8 [ T (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 T" r' `6 R7 q: j set intersections roads with
% T9 v% s0 F0 ]; Z5 W. z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and4 u0 x/ a6 M9 K u; a* ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 Z, e# \) A3 A0 `; t. p( Q
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ask roads [ set pcolor white ]! e: e. y+ }- _. \% \1 E
setup-intersections3 @- I5 W) l) |7 g5 L' l8 b' R9 P& S
end
2 w$ M7 Z1 w" S2 B1 Q1 l% \其中定义道路的句子,如下所示,是什么意思啊?
; d$ {6 |7 o& }! F3 d0 q2 ? set roads patches with4 N" O* z' K, I5 m) ^/ {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 |4 ~$ W8 z/ @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 m0 M! f- d6 P+ r+ \
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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