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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 n, Q( r8 g- W l2 h8 d
netlogo自带的social science--traffic grid这一例子当中,; T' R( Q* D4 F: t0 }
globals3 T* p/ H& v& A$ a; q
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grid-x-inc ;; the amount of patches in between two roads in the x direction
; y- A) j3 h% q grid-y-inc ;; the amount of patches in between two roads in the y direction
1 j3 W0 r# T* A6 o* Y0 H acceleration ;; the constant that controls how much a car speeds up or slows down by if
. x4 i, L( Q& J3 W ;; it is to accelerate or decelerate
8 Z5 t4 z( ^6 ]4 q) u( b4 K/ u phase ;; keeps track of the phase1 l/ o) {5 N p* E* Y6 [
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
5 m* U& c5 [! z3 y- O6 u0 b0 i current-light ;; the currently selected light
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7 `. X' d. V* I* B; {2 C9 ` ;; patch agentsets
# g$ C3 M$ g+ m6 Z, \* ]: Q intersections ;; agentset containing the patches that are intersections, t( d5 R X. g1 z% Q: F8 R
roads ;; agentset containing the patches that are roads4 t7 F0 d3 a [
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turtles-own9 D! O) ]) a* Q7 c" F2 R4 Z
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speed ;; the speed of the turtle
H$ Q( Q: s8 D& S# ~3 G6 t& W up-car? ;; true if the turtle moves downwards and false if it moves to the right
+ L& U7 Y* c9 q3 @4 G+ k* w wait-time ;; the amount of time since the last time a turtle has moved6 Z2 X. D$ F4 c! X& S! n+ W
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/ I8 ]5 r2 w, r! J4 j# ?1 Y$ d7 xpatches-own( N) I# u- G. f/ v* v3 N# F
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@7 t6 @6 U! }0 x intersection? ;; true if the patch is at the intersection of two roads4 S0 x8 f O# f) p: y; U
green-light-up? ;; true if the green light is above the intersection. otherwise, false.6 d6 I% t2 d8 L/ A6 Z2 |) Z
;; false for a non-intersection patches.: ^/ x, n# t/ |: F3 ^7 R
my-row ;; the row of the intersection counting from the upper left corner of the
, s, ~2 o2 e6 B H A ;; world. -1 for non-intersection patches.
& H1 z5 ?* J- U4 M B my-column ;; the column of the intersection counting from the upper left corner of the
6 M5 A+ A) h1 Y: u- K ;; world. -1 for non-intersection patches.
: L+ P# r) q. Y, w. s my-phase ;; the phase for the intersection. -1 for non-intersection patches.
9 u& n- P I! O- A$ h auto? ;; whether or not this intersection will switch automatically.
q6 V' \# R" F ;; false for non-intersection patches.1 ?: F# l; N) P1 a0 O
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;;;;;;;;;;;;;;;;;;;;;;% A3 B; p% u' f; D) A9 S6 A
;; Setup Procedures ;;' H! \( K% t7 n5 X
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.# Z2 c+ f/ K+ x& B* N5 K
;; Create num-cars of turtles if there are enough road patches for one turtle to) z* d4 \8 N) r- J% X& P% t
;; be created per road patch. Set up the plots.2 t, {$ F. E( ]
to setup
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0 C( I) [% v b- y+ C setup-globals
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. Q0 F; t5 K' y) e1 q ;; First we ask the patches to draw themselves and set up a few variables( p, ~+ B" |+ f) a5 G
setup-patches8 M4 a2 ]5 J1 [) }4 K" {3 z( E
make-current one-of intersections0 U( t4 g& b. P ~
label-current
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1 i u: W* k, R* ^ set-default-shape turtles "car"
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0 k6 [ H+ r g& ?& n7 O if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "' m$ h; G+ W( v- t4 a# h9 @
"road. Either increase the amount of roads "
# T$ S. E* W. W5 D* H- S "by increasing the GRID-SIZE-X or ". {2 e' k) M- r% X5 B
"GRID-SIZE-Y sliders, or decrease the "
: t3 Z, K1 p9 w) j1 ?/ J "number of cars by lowering the NUMBER slider.\n"
( A- j5 v) g5 Q( Y3 I "The setup has stopped.")
5 o0 N# B5 }+ @ stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 K) d9 m1 t" V% |2 t
crt num-cars* F; c! Y5 ^- l2 S) q
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7 l/ T) y" x; a) q' J setup-cars! t2 u% [& F6 x# N- B& T" h5 H9 P
set-car-color* E& e0 ^. _4 K2 ?- G) ~
record-data! _) N w* o s" W
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% k" w _& U! H1 ` ;; give the turtles an initial speed
1 Q/ j. C4 C7 G ask turtles [ set-car-speed ]5 _% v, ~' L. M0 ^/ _( d1 B
$ q( I' _' V1 z+ n reset-ticks4 N" C- d" Y- x ~; \" K
end1 I: x/ P) C0 S6 G- v# X( |
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet1 z6 e- e+ f, I, n+ Q
set phase 0
" {( }5 A: [; X7 z. |* t set num-cars-stopped 09 t( ]3 G# g3 `% A" u1 x0 f
set grid-x-inc world-width / grid-size-x
( r# q" s& L! k1 m set grid-y-inc world-height / grid-size-y
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. S% }, Q/ I% p; g/ D0 f ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
" o0 k; W& L( w9 o# H3 G set acceleration 0.099/ Z0 ], @. e$ X$ d$ a8 P
end
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$ I3 P h$ s& b2 W;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# L5 S% i V$ x9 ?$ r7 h
;; and initialize the traffic lights to one setting* G7 s# O; n3 u W
to setup-patches h* h5 |0 t: V& u" H& V. ?4 u
;; initialize the patch-owned variables and color the patches to a base-color
1 ]5 @! M+ y2 B$ v, O- V ask patches# |0 N; j' j% @# t8 |6 U/ [/ }; d
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+ T/ {( ]( n5 l0 x1 @ { N set intersection? false) [# d, s+ |% P6 u
set auto? false* E |9 z- G9 t1 @' C& C& t% ^
set green-light-up? true$ {3 z5 j8 A, I b
set my-row -12 v. E: g2 e# H& Y! n
set my-column -1
" w* z5 h' v% F+ A6 l% Q set my-phase -1
- o) \8 W. G) c7 z1 p4 B1 i N set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets3 N$ _% G( d# J7 T
set roads patches with6 |! E) P! ^+ e+ p. f5 B- U" D
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
J, k( L+ e& S) C9 t, ~( m (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ x5 C5 O( t* i
set intersections roads with
. e0 S- o5 C7 ? Y3 t' f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) Z' {$ X' u/ g, t" R5 R/ g0 y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]; ^4 ~! e) G) k% e& g" T# K( {+ {
setup-intersections
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' _8 M3 J9 n, i P. o7 @其中定义道路的句子,如下所示,是什么意思啊?
6 U8 _! ^' E% w$ w. k& v set roads patches with2 Z" G1 @( R P6 e( T! B7 W3 D
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( B/ o/ i! y: G" w8 } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 X/ u$ k2 q, Q+ _2 ~. C' _0 C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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