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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 @% h! e* r. `" {
netlogo自带的social science--traffic grid这一例子当中,
7 E! ?+ b" }# l$ g# s( o" Tglobals& `; ^: E8 x2 m
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* Z* N8 u* L$ l8 U6 G grid-x-inc ;; the amount of patches in between two roads in the x direction" k, |$ T0 ?: t6 k: H8 E8 W- H
grid-y-inc ;; the amount of patches in between two roads in the y direction
% R" A& i5 A9 I9 L' z \ acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 L4 }% V# u7 j ;; it is to accelerate or decelerate
q2 ~ e( N7 [+ \; Z phase ;; keeps track of the phase& L- S) j2 H5 o: q2 |/ e+ q
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 N5 `, S7 u; u, m) @
current-light ;; the currently selected light
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4 Q5 H" d/ D5 H' e ;; patch agentsets& ]4 o! Z$ |2 t( I! ~
intersections ;; agentset containing the patches that are intersections, t/ p. [1 |, z* l( M: U9 Y
roads ;; agentset containing the patches that are roads( F6 M( a' ?, Z+ w4 |8 `
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( y$ K+ m6 R. N$ E7 A' ~ f, Iturtles-own
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speed ;; the speed of the turtle
4 v d2 T- Q" D2 x& W up-car? ;; true if the turtle moves downwards and false if it moves to the right
: ]$ x% Y% \' y( n, y wait-time ;; the amount of time since the last time a turtle has moved( {/ } T D4 B0 }2 p
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patches-own7 s* X. F. R6 w; \; U& Q0 T
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intersection? ;; true if the patch is at the intersection of two roads
, j9 r; ~% ]( q) u' r green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% u7 h3 }1 J$ o% d0 k$ Y y: o& b ;; false for a non-intersection patches.
2 n6 A1 u) P4 z2 n3 n$ D% o) X2 N my-row ;; the row of the intersection counting from the upper left corner of the% D# d- i8 ~7 \0 ]
;; world. -1 for non-intersection patches.1 f5 d$ h- A. N% o
my-column ;; the column of the intersection counting from the upper left corner of the
5 T/ [7 v0 Q' \$ L- v) u ;; world. -1 for non-intersection patches.- K6 ^- U* ?5 X' r) K8 U. e* g- m
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
% I( `8 {4 z9 Y) r* V8 ^& D auto? ;; whether or not this intersection will switch automatically.; Z4 Y% z7 J) Z7 G3 ?. x, ?6 f
;; false for non-intersection patches./ s4 `; U% C" O( A& k/ _+ f2 d
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;;;;;;;;;;;;;;;;;;;;;;+ S$ S2 f' h& e/ F0 t! A! A
;; Setup Procedures ;;. S! t: m' r( }
;;;;;;;;;;;;;;;;;;;;;;. Z }: F: I+ S# o7 u$ V
7 p- u1 k Z9 A+ p;; Initialize the display by giving the global and patch variables initial values.
. O3 @( @2 E* a/ W, n; B5 j;; Create num-cars of turtles if there are enough road patches for one turtle to8 T# b( `, ]+ {+ k& l5 O
;; be created per road patch. Set up the plots.! I5 h( ?7 e" H) J& x0 Q! M
to setup, z2 Z0 b8 j. ?) Q& Y B- U8 y
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
) s. o o9 p' a- i' i1 R setup-patches
( w3 k0 A. I# ] S9 P" a make-current one-of intersections
: c' s& f8 x& K F label-current5 G7 @! s$ ^. u
. V {# [# Z" X- c) k set-default-shape turtles "car"1 p; P- M D; y3 ]8 A4 y& B
2 t) z; }+ `, Q: L if (num-cars > count roads)7 c! q0 @6 e7 A" ]* ]6 Z4 ]
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user-message (word "There are too many cars for the amount of "$ Q9 f& t h! V' f
"road. Either increase the amount of roads "
, ^5 |# M) w+ e# i/ Z I "by increasing the GRID-SIZE-X or "/ L* } N; k+ x% v4 G# Z
"GRID-SIZE-Y sliders, or decrease the "
1 \7 |4 y& p9 q3 S7 @, f' l, A: d0 s "number of cars by lowering the NUMBER slider.\n"
9 H1 c Q' f* [0 X- G( L! n# }# y; p "The setup has stopped.")/ r9 t7 R" R4 T9 q# f# O. Y
stop! Q- m0 \# Q/ n* t E& B
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* J( N9 x- F/ f* A3 Z ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* D9 J/ \/ a8 e/ M3 O9 r5 W, m crt num-cars
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setup-cars" M4 U% z- j* H, W# Y& P
set-car-color
8 u9 w8 [3 v, d% M record-data
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, u: |# b! [ S5 x; x ;; give the turtles an initial speed8 H1 O' l6 v% q8 M8 i& x( @5 U
ask turtles [ set-car-speed ]
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. K: c$ n& A) Y& ~# [ reset-ticks
% {% D3 u1 B) K: @) ]end$ V+ g: F7 }4 ^' {' a
! O5 F2 b% u( ?;; Initialize the global variables to appropriate values
$ ], W$ ?! e" {8 k4 ?to setup-globals
2 L* g7 A" s9 M+ [7 r set current-light nobody ;; just for now, since there are no lights yet5 _! c7 }2 K! ?$ p. Q
set phase 0# M1 @9 n- b% ?
set num-cars-stopped 0
# A2 V/ I4 Z$ ~* _) x' m% g4 t4 k! R set grid-x-inc world-width / grid-size-x' o- {0 f0 t$ p5 y5 x! L# @
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- M6 Y6 B8 g1 P" C
set acceleration 0.0997 r% f2 C: P6 l* t& n
end' l4 b4 L: c$ o0 `* {
2 D1 i; x* `( K+ {: z" @;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
b0 a5 x4 u I. Z8 m P3 {1 @;; and initialize the traffic lights to one setting: x& Z% j# l1 p; O D% @
to setup-patches
" `4 p3 c; W. H+ X$ A' V ;; initialize the patch-owned variables and color the patches to a base-color
+ T7 \# P. B. O- Z: l! f2 ^, m ask patches
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8 F( l5 L, C$ W: Y set intersection? false" k) h5 q1 u+ g$ L4 q/ J
set auto? false; L4 p" _5 ~, s' w, {1 [
set green-light-up? true
- x z. Q) n7 N* I set my-row -1
! u- J% C# a9 i' _' w8 T% F set my-column -1. o- z+ M$ W& a. D* y
set my-phase -1$ i1 K1 `/ ?9 I1 R$ \
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets0 ^$ Y6 {# N9 F5 v$ u" x
set roads patches with1 u! X: R3 K% w3 ~" c# Z9 Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) ^* L: A% U U# G+ a3 Z T; n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( `7 k; A* E: c% j2 Q0 \) i% W
set intersections roads with# C; Z% i: s' ~# j% k1 u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' e) J0 m8 J3 w, ~* \( k& E0 r (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ] K/ b% j2 B; e0 j9 J
setup-intersections. m! |) }$ d4 j8 [, |) J% u8 n
end5 r* l+ I& a$ F8 [* ^
其中定义道路的句子,如下所示,是什么意思啊?) B. i9 _. s1 i
set roads patches with# S7 e6 X0 J: v
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" v( S# h4 @; i- H9 \8 n/ _
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ C+ s/ P6 @9 E4 [
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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