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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。; K! W, ` C( R9 W1 @; c7 Z0 w) ~: u0 k
netlogo自带的social science--traffic grid这一例子当中,
1 B6 O% z4 ?: l! ]+ F0 e& xglobals8 S8 _+ p' G7 G; b) |! A; `6 f
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0 f9 l$ E9 J, C! d grid-x-inc ;; the amount of patches in between two roads in the x direction
8 V, [* i7 B4 k0 v o6 l- N# q grid-y-inc ;; the amount of patches in between two roads in the y direction8 a8 P( t, N9 k9 S) J1 s9 h+ x! f7 u+ b7 j
acceleration ;; the constant that controls how much a car speeds up or slows down by if' Q/ H H" O& `& z. `2 X H
;; it is to accelerate or decelerate. h$ a$ u+ L( S* w- [! P4 r& @+ I
phase ;; keeps track of the phase" T0 o! E( e0 g% I2 w
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
+ G- l2 g4 X3 ]7 r2 o$ w3 j& t9 c* ~ current-light ;; the currently selected light
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;; patch agentsets; E3 r: g9 [# S
intersections ;; agentset containing the patches that are intersections
) M9 t K" ~8 U7 `# @# R roads ;; agentset containing the patches that are roads
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turtles-own
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0 {8 Z& k/ b0 r6 M speed ;; the speed of the turtle0 v8 Q/ G3 X+ I% Y1 [
up-car? ;; true if the turtle moves downwards and false if it moves to the right6 s: t9 _! u/ V. p6 Z- N
wait-time ;; the amount of time since the last time a turtle has moved- h; q% k5 o6 l; R2 t
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patches-own5 @; P; {1 B# _$ F# C( z% d8 S
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% W3 K+ x4 [5 u- t! C ?. p$ | intersection? ;; true if the patch is at the intersection of two roads
% o- [7 }: T, B- ^! k green-light-up? ;; true if the green light is above the intersection. otherwise, false.
8 B& w, A6 s: |. s$ H7 \ ;; false for a non-intersection patches.7 ]' _% K1 C% F; m
my-row ;; the row of the intersection counting from the upper left corner of the$ s7 j/ e" s0 D5 G. F+ P
;; world. -1 for non-intersection patches.
- X" o9 s9 t( A/ n/ O my-column ;; the column of the intersection counting from the upper left corner of the
# d% I* V" E4 p& u ;; world. -1 for non-intersection patches.
( G( J6 H! I. _ my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" I( y* i L: F auto? ;; whether or not this intersection will switch automatically.
5 e+ g3 [3 z/ {* ? ;; false for non-intersection patches.
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1 `/ H1 S) l2 e! G H. y- Z;;;;;;;;;;;;;;;;;;;;;;: p- B+ |- N1 `' Z
;; Setup Procedures ;;
+ B" J: r) j0 O0 o;;;;;;;;;;;;;;;;;;;;;;5 E+ I! J% g* A! |! S
; W, s# j5 S# D. P/ n+ n;; Initialize the display by giving the global and patch variables initial values.
, i# Y2 Z: c* k r) ^;; Create num-cars of turtles if there are enough road patches for one turtle to
# t) Z& v: l1 `8 p/ p. e2 J;; be created per road patch. Set up the plots.* |; e5 j6 C: X1 r4 Q
to setup
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+ S# o2 l* r; d$ c setup-globals% q5 p0 m3 V/ R/ H6 F8 o
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;; First we ask the patches to draw themselves and set up a few variables/ e3 U, M9 `3 P
setup-patches
- D+ o+ u# `5 S6 H: V- a make-current one-of intersections# k2 ?& c. R$ M* j: X; |, ~
label-current
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# Q( U2 Y# F7 k( |3 f' r& H set-default-shape turtles "car"7 O6 O) v% K8 n9 _% F! i5 x
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if (num-cars > count roads)! J% M0 S& I/ I3 E
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+ |. ~/ r% j" K, r- T" T( ^ user-message (word "There are too many cars for the amount of "+ v; l2 V8 K( r) T1 E8 Y
"road. Either increase the amount of roads "
4 Y) K0 U- F* |. T% |% }' ]7 ? "by increasing the GRID-SIZE-X or "
2 t; g' T2 B4 Z% T "GRID-SIZE-Y sliders, or decrease the "$ L4 w" K4 i2 ^
"number of cars by lowering the NUMBER slider.\n"# l% j3 l5 [/ b0 K1 u* x3 Y
"The setup has stopped."), c, D) K5 U& w* ]' w# |6 n
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
4 a- `7 g+ M J crt num-cars: _+ J9 L @$ W, ?
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setup-cars' c$ M- o: Q2 R/ ], `) S% w5 M
set-car-color- ?3 Z5 b$ A- ?8 _
record-data% C. ^( }* S6 M0 q6 r' ?% [
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8 r7 v0 C+ b: u ` ;; give the turtles an initial speed
: Y6 E% l/ h& q$ V ask turtles [ set-car-speed ]# C5 y' p7 `" p/ l& w/ o
- o+ D0 z8 b; O t) ^ reset-ticks9 E$ b7 b. a& b0 x- D
end( O; j6 j$ H8 |' d
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;; Initialize the global variables to appropriate values
# U" \8 [' q R& g" Kto setup-globals
2 V: T. O$ R1 g x, R& ~/ { set current-light nobody ;; just for now, since there are no lights yet. a1 T+ p2 T' n+ d
set phase 0
0 Z! u6 j9 o+ V3 T8 W6 K set num-cars-stopped 0
2 m# J* f. [( I6 H, D set grid-x-inc world-width / grid-size-x
% ^, f! K2 r* W0 L( Z5 q7 E; v% D set grid-y-inc world-height / grid-size-y- |' P7 g3 A$ b* {7 f" e/ }
2 r( f( @; D- o% s( f# Q8 ] ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 p8 a* n& h! l6 a. |1 g8 F
set acceleration 0.099
2 [6 H; n! V& D9 fend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 o8 G; x v* K3 H, Z3 Y;; and initialize the traffic lights to one setting
7 X2 D0 e+ `' u6 fto setup-patches4 W% k+ q4 K5 X1 p' m, Z, o
;; initialize the patch-owned variables and color the patches to a base-color
* O4 Y! | d2 V t/ q3 Y0 h8 q) h/ H ask patches- D# m, ?) n, `4 A/ r+ [
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9 G: h1 g; u9 B$ p set intersection? false, r6 ]8 L6 Z$ z5 b! I2 g& A, U: i
set auto? false2 E- I; u# l! x' w
set green-light-up? true, j) k4 w( k# r' d; i8 E1 i
set my-row -1: J+ F0 o, D/ u- N. ?
set my-column -1
0 Z i5 S" M! T& a ] set my-phase -1
( h Q# F( b1 M: i$ D3 J+ h+ } set pcolor brown + 3& q s: r9 {% I& z: s- r7 L
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;; initialize the global variables that hold patch agentsets5 X1 ?$ d( q- f6 ?- |, u- q
set roads patches with; n7 k, L! D0 o; g
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ L8 e! d% J+ F! I- ^1 p1 M4 v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 G" O2 K3 n' G! t" c2 @& @ set intersections roads with
& s8 @5 F+ J4 C' a! k# s$ t [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 e( Z% j5 h2 r2 x7 r5 O$ F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. u) u0 d" K& l# a9 F7 b- |! m2 @+ J
4 B3 b% d2 W( j! w# n6 z ask roads [ set pcolor white ]) P' i5 A( m& v. P+ l* H. k
setup-intersections! w5 N. b7 U( s# r$ b' ]
end
/ a, y$ R5 a% r& h& P% Q% Q其中定义道路的句子,如下所示,是什么意思啊?
& t( C' D7 D A- |0 X2 l- U set roads patches with4 I5 _, g$ }8 O. z% t1 ^% D
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 |- W3 b9 J0 @5 a& V D2 P/ K7 C9 q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 e: S, V! ?2 _* h% {7 t' \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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