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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。
8 f" x7 Z0 u6 n }7 unetlogo自带的social science--traffic grid这一例子当中,
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) {$ E8 a+ Y" w; z grid-x-inc ;; the amount of patches in between two roads in the x direction% H9 X& O9 Y2 z( N( u
grid-y-inc ;; the amount of patches in between two roads in the y direction
" J! b/ P8 A0 g5 [/ ` acceleration ;; the constant that controls how much a car speeds up or slows down by if
: N* X8 e8 l1 K ;; it is to accelerate or decelerate6 Q& ^9 g1 S# u0 P% M
phase ;; keeps track of the phase8 u" n/ v, O+ I" s* Z3 `% U- X
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure8 }$ Y- S; _8 N! r% A. |# a* u
current-light ;; the currently selected light. s8 c( s6 `- ?+ Q8 U) }' I; v% _
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;; patch agentsets7 ^+ _! k5 t R4 D
intersections ;; agentset containing the patches that are intersections
4 o" q% \7 l8 m roads ;; agentset containing the patches that are roads3 [4 j9 W" J# \
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* Y! Q! c6 `! P3 ?: l4 vturtles-own+ A- `) S8 n U! f- u
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speed ;; the speed of the turtle# O& X' y7 q2 L' i# ], Q
up-car? ;; true if the turtle moves downwards and false if it moves to the right5 U* q1 {% e, ^ C2 R
wait-time ;; the amount of time since the last time a turtle has moved4 w* p( r# H9 J4 a! T
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1 d+ K/ C) n( [. Z8 ^& i* E/ kpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
6 w, I G5 E( M: j green-light-up? ;; true if the green light is above the intersection. otherwise, false.
: j& r8 [8 S. b. h4 h0 M ;; false for a non-intersection patches.! x1 E0 J6 ]! @0 x# o" E1 z
my-row ;; the row of the intersection counting from the upper left corner of the
( G# h# D/ d) d& ^5 z ;; world. -1 for non-intersection patches.
9 t- Q4 a/ j& b R9 W! ] my-column ;; the column of the intersection counting from the upper left corner of the
& J: j& ^5 A0 E ;; world. -1 for non-intersection patches." }+ o9 {5 ?; \+ x
my-phase ;; the phase for the intersection. -1 for non-intersection patches.( x/ P7 M, s0 Q9 d& g
auto? ;; whether or not this intersection will switch automatically.' X/ j% L- J8 h
;; false for non-intersection patches.' t1 T! T" G; X o
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;;;;;;;;;;;;;;;;;;;;;;
) w' {, c0 D) `% I! ?;; Setup Procedures ;;
$ e! V/ }5 u0 l6 m; d;;;;;;;;;;;;;;;;;;;;;;* Q7 n$ `1 F! v( L) y; u8 ]* W( c
2 D2 ?0 T+ F6 r) n% Z1 Q;; Initialize the display by giving the global and patch variables initial values. C: @' g( r1 _4 A- V) h
;; Create num-cars of turtles if there are enough road patches for one turtle to
. [3 c$ N# s2 |" E8 m) D;; be created per road patch. Set up the plots.
$ t2 k: E- u7 y$ I/ Q7 qto setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables( |1 D3 i+ ^" l7 i# d
setup-patches
# E3 e: y& N( K make-current one-of intersections
9 X% g1 J9 i( M( W! \0 e% F label-current
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set-default-shape turtles "car"
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/ ^6 S( N4 v! [0 {7 m5 b' T [$ ` if (num-cars > count roads)
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8 |( S8 x. @3 H7 W# i! B$ o1 F user-message (word "There are too many cars for the amount of "
4 I' a& j" B3 R V( j+ \3 q1 t# h/ c "road. Either increase the amount of roads "' ?5 W1 @' H) ?: S
"by increasing the GRID-SIZE-X or "
5 ?4 w9 Z( G z. K8 q6 k "GRID-SIZE-Y sliders, or decrease the "
3 _' T1 s- M- Q0 P "number of cars by lowering the NUMBER slider.\n"
, q7 o! S$ ]7 l' s4 v$ l5 {" f "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' L1 H' F {8 Q* T% g& |3 J4 c0 I
crt num-cars, U7 P! x$ {( X1 w% N1 t' n
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4 M7 V& j8 r7 u5 G6 H4 L setup-cars4 q: J3 \# m& W, c/ S* e; `$ C
set-car-color
) { ]5 B2 T5 x record-data
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1 f% Z+ F2 W6 t: o$ I: I ;; give the turtles an initial speed
: u# q9 R- V, P% N ask turtles [ set-car-speed ]
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reset-ticks" h+ g/ [& i8 r0 i
end, R( c; X9 A% r* x" F& v; U
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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 yet6 n& t- j7 \1 G; v! A/ V
set phase 0* I8 w1 F: E! B; G, C) O
set num-cars-stopped 0# Q8 R' M$ |- \0 G( M2 V+ S" Y) x0 s
set grid-x-inc world-width / grid-size-x5 h, G8 K8 W6 x: C3 S0 f
set grid-y-inc world-height / grid-size-y
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5 P/ ? ~- ^; |" o! U/ E6 W ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 Y$ x- P9 ?; g
set acceleration 0.099
9 g) Y7 N. u2 k5 ~+ l) ~6 gend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 I. A5 v u8 y* t;; and initialize the traffic lights to one setting
5 @, X, {; |: T( j9 ?1 n& ato setup-patches% I# n# ~3 o8 Q: ]7 U
;; initialize the patch-owned variables and color the patches to a base-color0 U: i" E$ [& p- ?- U! C& y6 E$ u
ask patches; d1 x4 Z/ N2 z5 ~
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set intersection? false
9 Z+ N8 ]7 ?- \- \ J set auto? false
3 V% h3 P7 z! K5 I set green-light-up? true
+ H" T0 h3 j! J. [! P' z" r3 ? set my-row -1
# G' U6 G% \ D& i/ H/ o6 \! ? set my-column -17 ~$ ?' V" P$ n6 ^/ R0 E c6 d# I
set my-phase -1
5 `0 j( N# w9 F. ^ set pcolor brown + 3' k2 l9 F: K, z8 D- Q& n
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;; initialize the global variables that hold patch agentsets- A' _# w( g+ |: q
set roads patches with
# n. l6 ]! c" w& s [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 l4 \, f X' v* l
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 }9 Q' V/ c; I set intersections roads with
! G5 f" _( `/ ^9 h6 s: B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ B3 X5 b/ r! p; @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" g$ Z) O% K' y$ C8 ?
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ask roads [ set pcolor white ]9 S0 D7 V, C1 |. b" y1 v# X
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?: D' Z8 P2 ]9 t
set roads patches with
0 C* z; n8 t) d7 q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 v; p6 A: Z1 c' h0 [! r
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 E4 A5 V0 N3 @* K/ M0 i
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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