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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。
* s" l/ |" U. ]% rnetlogo自带的social science--traffic grid这一例子当中,+ |7 w4 C5 X) A r" G7 h1 I1 V3 P
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
3 p& q. @+ Q: h! i' j grid-y-inc ;; the amount of patches in between two roads in the y direction' D( D/ b" I, D- ?/ c' V% q
acceleration ;; the constant that controls how much a car speeds up or slows down by if: h H, N, S, ~9 H+ x9 Z& a" J7 H5 c
;; it is to accelerate or decelerate1 m; `6 O. F5 r/ v
phase ;; keeps track of the phase
! u+ |, } \: D O% G# x5 [+ M num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
7 N. M6 g \( b current-light ;; the currently selected light" I$ y/ K# p% Y3 n+ z( L
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;; patch agentsets
4 K& U+ s% Z) D* u- K! r intersections ;; agentset containing the patches that are intersections* n# ?/ n7 Z; B" o$ `, v
roads ;; agentset containing the patches that are roads
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+ f/ _7 y; e7 v& k( zturtles-own# z+ B6 ]! b) k- g$ @- ^# C
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speed ;; the speed of the turtle* ^/ q1 k0 |! ~9 ] K( c. K
up-car? ;; true if the turtle moves downwards and false if it moves to the right4 V4 {, t* B7 a8 I: _7 u
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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; ^) t3 o; v8 K2 ]+ Z9 ~7 B6 n intersection? ;; true if the patch is at the intersection of two roads
' k/ d1 r0 y6 { green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' q: K" ~, M, ~ ;; false for a non-intersection patches.
6 V; @6 p9 {+ N" B( H T" w* V8 A my-row ;; the row of the intersection counting from the upper left corner of the
& x9 @0 k5 I* z( v ;; world. -1 for non-intersection patches.
# ~' q! j2 i7 i0 C7 j! Y7 G& [$ o my-column ;; the column of the intersection counting from the upper left corner of the* S' Q ^& d& v! X, i& J6 g
;; world. -1 for non-intersection patches.! Q/ C2 }, K# S! c3 j2 U# p
my-phase ;; the phase for the intersection. -1 for non-intersection patches.. W6 D3 M$ N6 p: \/ G$ X) E
auto? ;; whether or not this intersection will switch automatically.
- Z; @; X" w) C# w# W ;; false for non-intersection patches.
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# I6 T. ~- f( X/ G5 R5 E6 Z7 A;;;;;;;;;;;;;;;;;;;;;;8 {4 g/ T1 ~" N* O0 l6 |
;; Setup Procedures ;;
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3 i& c% Y7 e2 o2 { u" j8 t;; Initialize the display by giving the global and patch variables initial values.
/ r( f# o! M, O% s3 ~6 D% I2 M: q;; Create num-cars of turtles if there are enough road patches for one turtle to8 ]* B7 y: s1 y
;; be created per road patch. Set up the plots.% O- s5 T4 e( Q# o9 O c
to setup; D+ G6 L* g6 X# U; I
ca
, I$ ]* y: G1 h% s1 E0 s 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 intersections5 q1 N6 T f, ~( q
label-current
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9 P$ M2 N# {4 k- y/ a9 ~& ^8 U set-default-shape turtles "car"
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if (num-cars > count roads)% m' V$ `9 t! X: _
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user-message (word "There are too many cars for the amount of "0 Z4 T R6 a* T1 L2 m# O- P
"road. Either increase the amount of roads "
& P# N g4 u/ ` "by increasing the GRID-SIZE-X or "! Q2 t9 G0 o, I+ K/ `8 g+ \/ U. O2 j
"GRID-SIZE-Y sliders, or decrease the "/ M7 Z. q/ d. N1 W% A
"number of cars by lowering the NUMBER slider.\n"; I# M' b) L) b6 I
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
Q: \/ f; x8 `2 H* a crt num-cars# F ~, ]9 M2 i0 |- i! g& n2 k
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setup-cars# p( d l2 G4 r) H
set-car-color3 l( u: J( o! b, q
record-data7 u6 o, p- R h7 M' ^5 o
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1 x7 s* d- D% k6 t) ` ;; give the turtles an initial speed% q+ ?3 U( n# y) q8 X
ask turtles [ set-car-speed ]( b* C/ i+ U: c9 X$ u/ ^
2 @0 _ ^: p u U e reset-ticks# w: _, t/ F$ U+ q3 }! N |( [; p
end: p/ q4 Q* t& }$ f* j1 [& l
+ u8 f+ _- ?" z; P;; Initialize the global variables to appropriate values) ?+ \( v: H5 H
to setup-globals
0 t. Z/ S: i ]% `" W3 _' _) N5 K set current-light nobody ;; just for now, since there are no lights yet( f' h% Z9 k4 j/ u# U% f
set phase 0' z3 D# v' |/ ~! Z O0 R' i
set num-cars-stopped 03 u) d4 _5 V- P; d+ y! q& {
set grid-x-inc world-width / grid-size-x$ \ ^3 k% d. \9 g, ]5 P
set grid-y-inc world-height / grid-size-y% K- T) d3 a( R' W8 `$ ?; J
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" f; E; }) h& c$ h+ ~- e( H
set acceleration 0.099- {1 j! N _& m, b7 Z5 K
end, v0 J% L( x5 ~9 w( y
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: ?) S* |9 N( T! @- ~;; and initialize the traffic lights to one setting6 c+ O$ d5 A5 G4 l) k% L
to setup-patches
3 t+ z9 g9 Z" B. }5 k ;; initialize the patch-owned variables and color the patches to a base-color
E2 K' n5 k3 M0 N+ M ask patches
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set intersection? false* p& u- j" n8 F5 k& z+ }* e
set auto? false i4 d( O6 M! p; K
set green-light-up? true, q; d2 A9 p* {4 `( b. R9 D; }! o
set my-row -1, n! N$ _5 |8 z
set my-column -10 [4 h' S/ N; d3 ~% {" E
set my-phase -1
) \' B9 i4 k& u+ E9 \ set pcolor brown + 3. g# o8 V, X! U8 T& c1 Z
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- E) z; @+ C1 Z" z- G$ P, D ;; initialize the global variables that hold patch agentsets
' X7 `1 B: f4 r4 W: j set roads patches with
\- ]7 A3 }/ N9 j* V [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 |2 H$ g, F. W7 p9 R% n( G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 X- ]& S* `2 O6 S) p+ U" `1 h4 m
set intersections roads with7 C% o& q+ j6 s3 Y5 h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( \0 E; u4 j/ i+ S5 l (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ U$ o/ I# Y: j' r4 v* Q
) e+ t6 Y) [9 k6 v/ m ask roads [ set pcolor white ]
5 F7 @# T" @! l setup-intersections
8 s8 ]- n% ]6 D7 A6 e1 I# Lend
4 R5 { r7 n" x其中定义道路的句子,如下所示,是什么意思啊?2 P7 I C |9 C( Z
set roads patches with3 }" u5 p6 J7 _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 F4 z7 z3 i9 G2 K; ?- u W) H (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) J! g5 o! j$ l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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