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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。
/ z, O5 c9 [8 S1 Y6 w7 m) Nnetlogo自带的social science--traffic grid这一例子当中,6 t' D# _, F5 ]4 ]. A; G1 k
globals) T# ?5 K( _6 w: L* L, l
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grid-x-inc ;; the amount of patches in between two roads in the x direction- r* T) `" }" p2 N% d
grid-y-inc ;; the amount of patches in between two roads in the y direction7 R7 o* I5 e' z% h4 A
acceleration ;; the constant that controls how much a car speeds up or slows down by if- Y* n" I. L/ k* m% }: j
;; it is to accelerate or decelerate3 c* j$ H1 {# n( n) g5 V1 m
phase ;; keeps track of the phase; T9 B; Y/ C* N& d8 H
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 @' w6 Q! z. R% n. G
current-light ;; the currently selected light0 l( W/ E: Z* T& ^; r9 W
' K7 r1 J9 [' D" c4 v ;; patch agentsets& b* Y+ W+ k& c
intersections ;; agentset containing the patches that are intersections
, t* _. K9 A/ i- s0 r: b: y7 s roads ;; agentset containing the patches that are roads4 Y7 j. W1 D& i8 X: V
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, E- G1 i; B5 z! j- I/ |turtles-own) h5 U& O' H6 k0 y8 p2 p- t6 |
[
7 [: \% I O: I: @' q& z; {0 u/ x speed ;; the speed of the turtle
6 ~9 ]2 c& H7 ^3 s7 h3 r; B up-car? ;; true if the turtle moves downwards and false if it moves to the right' ~, K. U" l7 R+ T$ p
wait-time ;; the amount of time since the last time a turtle has moved3 H, l" x/ N8 L! M" p4 {, w) D1 o' ]' P
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' a; g) E+ s) _' Z: E# Qpatches-own
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. `4 {3 A" I/ h6 ^ intersection? ;; true if the patch is at the intersection of two roads' Y* J& e- Q! B& a
green-light-up? ;; true if the green light is above the intersection. otherwise, false.) g, ^9 y) z4 ~. z
;; false for a non-intersection patches.1 d4 d" f0 Y5 X* {. j: |. Y
my-row ;; the row of the intersection counting from the upper left corner of the( z: n0 u+ h. C0 C' \
;; world. -1 for non-intersection patches.! e: n5 o" D/ [( K* Y7 U! ^- A3 Z
my-column ;; the column of the intersection counting from the upper left corner of the( u9 H, e2 }' N0 t! Z3 |
;; world. -1 for non-intersection patches.1 b1 z2 _$ u* H/ `/ O6 y: A) }
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
* d; R. `9 Q! u3 P auto? ;; whether or not this intersection will switch automatically.
+ T* F: E* w% z1 s7 u# y ;; false for non-intersection patches.: N0 L0 P h( m9 w; ]' Y
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* V7 \, E% y# _& R: {: c: V5 P;;;;;;;;;;;;;;;;;;;;;;0 ?3 }# `! d# d* g( E
;; Setup Procedures ;;6 K. h. j ], e
;;;;;;;;;;;;;;;;;;;;;;/ K/ F, A) @! B: K" I
# L! j; j" I3 W* w;; Initialize the display by giving the global and patch variables initial values.. M( L5 w1 q5 N+ H1 U G$ t! I
;; Create num-cars of turtles if there are enough road patches for one turtle to
* ~9 }0 R) I1 M) C( I;; be created per road patch. Set up the plots.% w! ~( o1 Q) U
to setup' t1 F; k+ \3 y: g+ J$ G& _" R
ca
- g: w- p9 v. ~/ V( [2 R, N setup-globals
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;; First we ask the patches to draw themselves and set up a few variables' _, I1 \, ?' }7 F4 V' @) N' ?8 q$ `
setup-patches
5 N2 _5 m$ T; d3 Z make-current one-of intersections
0 {$ }" { w. O' Z9 z8 J: K label-current. G- H; O3 l$ j3 Q; M
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set-default-shape turtles "car"
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if (num-cars > count roads)
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3 C: u+ o# z# A- _ user-message (word "There are too many cars for the amount of "
7 w+ Q0 }* Q; y "road. Either increase the amount of roads "0 y" _# W! q; T
"by increasing the GRID-SIZE-X or "
& _7 ]" N9 I2 N; N" n "GRID-SIZE-Y sliders, or decrease the "
( w& m: t6 y0 Z "number of cars by lowering the NUMBER slider.\n"7 i, q6 `) O3 q# [8 _" u
"The setup has stopped.")
, ^/ k0 O* Z5 F. X3 d. l3 s( M stop
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" J- j3 F+ ?* B T- q ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 q# G+ _% \: K0 P, a" ^4 p3 G; s crt num-cars0 Z' A" A5 p$ ?3 z C4 \& I" L
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3 L' g* K* L+ ~8 m7 C setup-cars% u; \' M: D6 W: {
set-car-color
o% I/ s6 H# ~$ _4 V0 l% C record-data
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7 N. Z7 ]5 `9 _, d4 T ;; give the turtles an initial speed
+ d: r$ |$ X% z& O! [' ]# G ask turtles [ set-car-speed ]
+ [( o0 j( c5 I+ s( u' B8 X4 g {5 h) m" ]
reset-ticks
1 {6 E/ S8 r* _' @& Xend( `# K& X+ V8 ?6 M" P
, b9 }3 e C7 t;; Initialize the global variables to appropriate values* R. e3 K9 N! c3 F
to setup-globals- V1 N E1 K6 n) t0 h
set current-light nobody ;; just for now, since there are no lights yet
# o- m4 H- @, @ `1 X7 h set phase 0
8 J2 G1 e& I/ P, E/ Z' ~4 H5 X4 L set num-cars-stopped 0% R/ }8 ^% S" b: Y; G: m z
set grid-x-inc world-width / grid-size-x- b! n( g6 `6 [. G+ A. F
set grid-y-inc world-height / grid-size-y3 z/ y$ T- m: ]
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 d' r) y" \7 l; z) | set acceleration 0.099
) b( u: F. B( l5 U" Yend7 N8 p( w* U$ ^4 X2 W
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* ~3 _9 s+ _* f7 a3 ?: G
;; and initialize the traffic lights to one setting; D% M9 g. h6 p6 \( @7 \; I
to setup-patches
- g8 g6 y M5 B, b ;; initialize the patch-owned variables and color the patches to a base-color2 o& k% }1 N$ T" Q5 @% m5 l
ask patches$ T* F- b6 Z4 o0 q
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set intersection? false
) i" V& D9 v' h4 ?% F( H set auto? false
6 `* k* ^: K7 D L0 o set green-light-up? true
! {% ]) p6 t, @7 c9 ]9 N$ C set my-row -1
1 m* ]0 ^( R0 O" U" u) |. J w set my-column -1
6 J* a* |% W9 v) ~/ A set my-phase -18 f v4 M" A. b/ l: A$ T
set pcolor brown + 3* D) G2 k0 U; L- U: D! x. T
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;; initialize the global variables that hold patch agentsets
" y. q; W# A0 g0 B set roads patches with
8 P( Y- x: w: u$ ?& i8 ?" k$ b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' G: e& h4 @3 {( H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: t! l- }) b# u! d9 q set intersections roads with
( s8 u4 K0 e! \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 X; \) _* ^8 W3 C: ?8 T- ` (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
. S" [5 b4 W/ q- R- S* Z, ]4 U setup-intersections
0 l9 ]& `# M+ n- ]end' b) e. U, c: v( X& ?: ^
其中定义道路的句子,如下所示,是什么意思啊?
E7 Z/ t9 W5 P- W$ o ~/ M; O set roads patches with
+ w2 I1 f& J: S' \- Y8 h+ T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" K2 `4 ~7 }0 x) O% ^% Z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 ^% M3 x, J8 Q; q! T5 H
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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