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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。
. u$ K( T7 Y' U& ~% O% \) Unetlogo自带的social science--traffic grid这一例子当中,
6 _' v. O/ D# d% A1 z$ M8 wglobals# W* C9 w/ ?8 h1 \9 X0 ~0 n6 V
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0 O4 Q; V& ~7 t/ g2 z grid-x-inc ;; the amount of patches in between two roads in the x direction [4 I% |) F. d
grid-y-inc ;; the amount of patches in between two roads in the y direction7 R4 p7 o3 @1 ^1 B: e# p, C
acceleration ;; the constant that controls how much a car speeds up or slows down by if, @: h9 H+ ]" R. d3 _
;; it is to accelerate or decelerate
8 S& E/ y* N0 a0 f3 f6 i! J0 m phase ;; keeps track of the phase
' ]* w* ?" J% z5 G1 R8 h5 Q Y num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
! m1 ]: [! w4 `1 a2 l4 T current-light ;; the currently selected light! b4 r) d9 {& W; [- ?7 ?
2 L# o* c s# p0 ~+ M$ j' O8 R ;; patch agentsets! [* a8 x5 k l, b: _: b
intersections ;; agentset containing the patches that are intersections1 t" O+ k, a$ m8 r
roads ;; agentset containing the patches that are roads
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turtles-own8 U4 P z3 e4 a$ O2 o
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8 `5 z5 _/ ^9 f& X3 B speed ;; the speed of the turtle
2 e/ w( M# c+ r; k" o6 d$ x1 { i up-car? ;; true if the turtle moves downwards and false if it moves to the right+ B/ @1 w3 p# U( d2 t: X7 S6 J
wait-time ;; the amount of time since the last time a turtle has moved( ~6 n q) @8 T7 u* ?4 | a
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! m0 I8 C# t7 o6 @$ T8 xpatches-own
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* G6 @3 w/ @9 i% l* F0 X4 ^$ w intersection? ;; true if the patch is at the intersection of two roads" V4 M; u6 f7 Q- S. [* R" U# M
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% s3 X3 r; t' F" _' H$ o ;; false for a non-intersection patches.
9 O f* M$ q' K( b my-row ;; the row of the intersection counting from the upper left corner of the: s/ i$ F4 a9 M* W
;; world. -1 for non-intersection patches.2 i' h( ~; Z! X5 |2 n; \1 I
my-column ;; the column of the intersection counting from the upper left corner of the
/ ~ Y7 k, v+ C2 z( a1 J0 m+ l ;; world. -1 for non-intersection patches./ h, j6 Z% C: a) [# K- {/ Y2 ^% G
my-phase ;; the phase for the intersection. -1 for non-intersection patches.4 ^9 ?" V- d" b2 |- m
auto? ;; whether or not this intersection will switch automatically.
8 Y: l* I* j/ b, Z' b# ^( M ;; false for non-intersection patches.
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& K1 N1 E t, O/ i. @# \7 D;;;;;;;;;;;;;;;;;;;;;;
7 {4 R$ B* A) R5 {' H, j;; Setup Procedures ;;
" l. a' ?6 u( _;;;;;;;;;;;;;;;;;;;;;;
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' B+ A. `8 j( ?; h: E, O& z" s;; Initialize the display by giving the global and patch variables initial values.
. ~* F0 g7 |+ V0 j;; Create num-cars of turtles if there are enough road patches for one turtle to
e& `1 E" ~0 K" [4 x2 i$ C! R;; be created per road patch. Set up the plots.$ P D5 }* K0 h) V" B
to setup, I. w9 y, {/ M
ca
9 |$ b' k, h, ]7 n9 w8 |" v* h5 M2 Z setup-globals
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;; First we ask the patches to draw themselves and set up a few variables) b f9 W" a% }( r$ H( R9 t# p
setup-patches
8 m( a) ?2 ^4 K3 P7 E make-current one-of intersections
) \1 a& F+ I; u5 @( |* a label-current
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) T7 D3 q* s6 [' }- r( V* O set-default-shape turtles "car"" W8 ~5 G0 R! e% ^
7 Q. Z1 h5 g6 p0 X if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
# N' J1 q8 ^+ J "road. Either increase the amount of roads "
3 r$ }% \3 Y9 E "by increasing the GRID-SIZE-X or "
* A% \1 T$ @6 [$ [! C "GRID-SIZE-Y sliders, or decrease the ". o: h, w7 W5 R. _% p- y
"number of cars by lowering the NUMBER slider.\n"& D, Y! b" F3 y9 O
"The setup has stopped.")8 C+ F# O) K6 q3 ^$ y
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
r: Q& ~5 B, _+ l% n5 G8 r) ?; @) T crt num-cars& x$ r" N, k& d+ z
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setup-cars
( N- T) `8 R) F- x, o0 M set-car-color
4 ]7 Y1 q4 ~% q8 u P record-data5 y' J4 Y4 G+ m9 K, T4 A- w
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3 T- `! B# ~6 B1 u. h ;; give the turtles an initial speed" N5 P' q4 P4 q3 ]: N
ask turtles [ set-car-speed ] \" ~8 h5 h- I, m f+ k: z+ p/ ^. r$ N
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reset-ticks
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;; Initialize the global variables to appropriate values/ C! r1 p& f2 Z1 ~, e) n
to setup-globals8 p$ h1 b6 s1 x: {
set current-light nobody ;; just for now, since there are no lights yet9 t* ^2 j1 {1 A1 c# u/ v) \
set phase 0
" t! M. S) X9 z5 S6 ] set num-cars-stopped 0
: V F6 i# b, u$ V! Q set grid-x-inc world-width / grid-size-x
, j u) r, I% ^& K% M4 H6 ?$ b* d* K set grid-y-inc world-height / grid-size-y
8 v" E" |+ X9 L# h+ v9 ^- f+ X6 C6 D* q2 z- [) m& `
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# L) ]6 y- N5 { set acceleration 0.099' I0 Z2 \$ @+ C2 d0 u1 T7 x0 @. ^ t7 A
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, R1 }+ w" I6 W. s8 r6 ~! [
;; and initialize the traffic lights to one setting& r8 L9 ?' u4 Q) d0 ]0 \- x& s g
to setup-patches
4 S% [8 {, j$ B% O3 V7 ~" \& H ;; initialize the patch-owned variables and color the patches to a base-color
/ I2 b. H( l4 ~4 h _/ g ask patches" K/ r* ~! y' U9 H4 K
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set intersection? false
- E1 w) _% p, U. G# L/ w! { set auto? false% f* v+ g% C* B
set green-light-up? true
- r! A: a7 N6 m) N- z7 P set my-row -1) n1 [4 L+ U# ~% y; `7 g# w; p
set my-column -1
y# d+ {; f) ^ M U$ O% r& t/ L set my-phase -1
. W$ ?; Z) W, B+ ~ w+ \ set pcolor brown + 36 @# L' M( e5 Q( a
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;; initialize the global variables that hold patch agentsets- O a# J# P2 i/ a6 _3 [
set roads patches with
# {; t' n1 p$ q# S [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 [1 D% k2 K7 p" _" F; T (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 b& r; W: t9 ~, P# f* {
set intersections roads with
$ U& s: ?2 |" A# i1 |+ f0 a0 I [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 b3 D3 R( j* E2 j( C6 n7 k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) J) ~% n4 W3 Z
& U6 m0 t9 m: D2 g6 u6 ~, F ask roads [ set pcolor white ]
# U1 s( J' ]. K( s/ l4 G, X setup-intersections0 D6 u$ D% R, c R4 l
end
9 w- @7 L3 s9 L( M# k4 T2 u其中定义道路的句子,如下所示,是什么意思啊?$ z7 _6 ~9 z6 {/ d0 ]: @7 b
set roads patches with
- v! F! t# O2 W; M$ b! x4 E [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 F8 s, N. C5 }: ?9 s( n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 P" @. m0 E: b+ L5 L a
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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