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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 x% @5 N% a+ I) D- T5 lnetlogo自带的social science--traffic grid这一例子当中,) @, o' J$ b% ]1 n. [
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
2 D4 S& U& P" M- {3 T grid-y-inc ;; the amount of patches in between two roads in the y direction
2 |, ]# s5 v7 j# m4 d; P acceleration ;; the constant that controls how much a car speeds up or slows down by if5 k- T' X/ Y- n# b3 ?
;; it is to accelerate or decelerate- Z# k% w D) N5 u
phase ;; keeps track of the phase
/ l! u+ |0 N* M. [ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure6 c& s6 G+ V- Z( x n$ c
current-light ;; the currently selected light6 T0 M/ k" H2 w' }' V Q
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;; patch agentsets
, z& C5 c% l) |9 @3 x) v7 j, U intersections ;; agentset containing the patches that are intersections
1 A+ b4 j" p/ i" D; C roads ;; agentset containing the patches that are roads+ K* Y+ T5 C9 Z/ E2 R3 W# F$ W; L
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* f8 W/ E2 a, Z4 H+ A2 ]8 Oturtles-own
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speed ;; the speed of the turtle3 G$ X3 ~9 g2 i V4 I$ y
up-car? ;; true if the turtle moves downwards and false if it moves to the right
G; {( {/ U" X0 _# j- I7 x1 b$ W wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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! c5 P/ H+ \% D. H0 G* ~ intersection? ;; true if the patch is at the intersection of two roads
( w' J* `* e8 B* Y& g5 c green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- L5 w# a' B9 s4 g ;; false for a non-intersection patches.
* P/ P. J1 \3 y1 q0 }! t4 M% C3 F7 f my-row ;; the row of the intersection counting from the upper left corner of the
9 F1 M; A- ` ^; D; a& V ;; world. -1 for non-intersection patches.1 R2 T" O6 y0 v1 s. M+ e8 J
my-column ;; the column of the intersection counting from the upper left corner of the
& @9 u* l' I- C& C8 k. n' J0 C7 | ;; world. -1 for non-intersection patches.+ Y$ V" U; l4 J3 d
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
% k! N3 B; F' J2 t( e auto? ;; whether or not this intersection will switch automatically.7 a7 q7 o) _/ g" c6 [
;; false for non-intersection patches.7 g( q% R1 G8 W
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;;;;;;;;;;;;;;;;;;;;;;
* o" g& R5 Q- S/ P0 g! K;; Setup Procedures ;;) Q5 [. e x' i" @
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# s3 H6 m8 C$ Q4 q" G9 J; w; ?$ V# i;; Initialize the display by giving the global and patch variables initial values.: c6 J" j: Y: |# _& N. Q$ v
;; Create num-cars of turtles if there are enough road patches for one turtle to
& Q, f# f: o' y& q;; be created per road patch. Set up the plots.
8 l" Q( @9 I4 {* J+ y0 Yto setup# A; v* X7 e9 R0 ~+ _
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
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make-current one-of intersections
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set-default-shape turtles "car"* h" X. r: ^( R9 P
4 w1 g- I! O1 C5 |9 D if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
1 e1 w7 ]- _' |$ D% b* F "road. Either increase the amount of roads "
' l9 E( q3 N/ r6 e5 ]( P9 ~ "by increasing the GRID-SIZE-X or "
, `8 c+ H" p9 K1 ~ "GRID-SIZE-Y sliders, or decrease the "9 U% s7 G, O ^3 W* X$ a6 M6 Z L" Z
"number of cars by lowering the NUMBER slider.\n"% T1 D: w- y, N; s5 `" A K' |: f3 ~/ o
"The setup has stopped.")
$ P. t% O# `6 |4 S) O stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% [; w7 Q9 _1 J0 L/ C; Q
crt num-cars
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setup-cars$ R8 }% R) d$ U# Y' M4 O! V0 A
set-car-color
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;; give the turtles an initial speed
& u- o2 c8 a. }: b# k! m8 \ ask turtles [ set-car-speed ]
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' l9 h ?: k% q7 [2 p reset-ticks
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' C2 \- |) Z) h;; Initialize the global variables to appropriate values% Z/ m- f, h5 Q% ]4 @# c
to setup-globals
5 ^ C. B# V3 p3 ?, i& H set current-light nobody ;; just for now, since there are no lights yet: ~: E4 { B9 M! j7 n/ ~( P
set phase 0
( u) O/ ^6 d7 ] set num-cars-stopped 0
# y3 V1 B$ ^1 b9 F set grid-x-inc world-width / grid-size-x
( n7 B4 {0 j3 i set grid-y-inc world-height / grid-size-y6 h1 E( [& G: t! G u y; B
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) _5 M' e) n% z. b1 o set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 V* B0 N6 [% d% G5 l% w z
;; and initialize the traffic lights to one setting
t3 D0 @/ | ~7 \( i- Qto setup-patches5 e, S6 @8 e2 l
;; initialize the patch-owned variables and color the patches to a base-color, D1 Q; x9 ~8 H7 L
ask patches+ y( c9 `6 U3 C# i f/ Q
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/ p* A5 j% z; _ set intersection? false j# p; q, z2 G2 \# v
set auto? false4 t- M( Q' M9 h5 y; z2 V* w) I6 i
set green-light-up? true* G* Y! U! y& B
set my-row -1
& l3 s' ^/ ]3 G3 ]! X# q1 h# C set my-column -1
) P8 @% r: c) f! {. N2 d set my-phase -1/ O+ z0 T5 Y9 k, e
set pcolor brown + 3
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) p, L$ n8 l6 J. F' ^$ t, ?- ]( k/ o ;; initialize the global variables that hold patch agentsets
2 t# E( H& u+ y) V set roads patches with# n1 K& i8 l" g8 n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ \4 L" M* b3 z1 I5 c (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: q; P K8 ]* V4 R3 m! p
set intersections roads with
7 r; t" ^4 ` V' h [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 q/ M3 I/ b& y( g7 L$ ]! N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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* q+ Z7 f5 N% G6 \8 a/ v ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?
$ \3 k( y: r" r( {) X9 k set roads patches with0 o" H4 ]. {4 ~$ \# [9 ^% _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! X& n% h- S; z2 s6 F9 I (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 z+ Y+ d% q# N U4 U
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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