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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。
) `* E) O$ q( U) h+ t- Q& cnetlogo自带的social science--traffic grid这一例子当中,
( G' E7 w7 ~6 vglobals
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3 M) g! }5 u1 P8 E+ D grid-x-inc ;; the amount of patches in between two roads in the x direction
8 p! S" N7 m- y: w! V5 M grid-y-inc ;; the amount of patches in between two roads in the y direction# r& s8 y3 m) }' I' B5 L: e; i5 Y
acceleration ;; the constant that controls how much a car speeds up or slows down by if, c5 v1 o( x% t! T F
;; it is to accelerate or decelerate9 s& Z$ D2 k% X2 k; v
phase ;; keeps track of the phase! K) T8 \- g3 Q; d$ E
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure! ~' z0 Z& G% j# }$ I/ @5 Z
current-light ;; the currently selected light
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4 u, m' c2 m' y% v ;; patch agentsets) {! ~) ]# j% `7 I) {/ d
intersections ;; agentset containing the patches that are intersections1 q) Q1 P! o: r& u' J3 ]
roads ;; agentset containing the patches that are roads( h. X1 c1 s; B6 K+ E
]
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turtles-own7 U1 O3 J7 R6 j" e3 m6 f G
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speed ;; the speed of the turtle
8 k, L2 ^) w/ g9 \8 j4 ? up-car? ;; true if the turtle moves downwards and false if it moves to the right
. D. |% u* F7 H* v/ H* \& j7 I wait-time ;; the amount of time since the last time a turtle has moved
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9 W/ k q t6 f Q8 ]7 t" D0 Opatches-own
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' k+ r/ H' ?: s3 I0 O, A intersection? ;; true if the patch is at the intersection of two roads
( X. i' g8 X& |: \ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) \2 N4 K b7 s1 n3 Q" [ ;; false for a non-intersection patches.+ L2 @) O) j& P6 V, j$ g
my-row ;; the row of the intersection counting from the upper left corner of the
) O6 p: Q7 W# w! D e1 x ;; world. -1 for non-intersection patches.* @ J" d- X8 S9 o: k4 C
my-column ;; the column of the intersection counting from the upper left corner of the! t8 P/ G9 J7 q5 P9 @0 p
;; world. -1 for non-intersection patches.
9 G9 H+ [' l( E& S my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 r; v1 F& S, H: z auto? ;; whether or not this intersection will switch automatically.4 t O L4 U, b# l( k4 s* A# J& ?
;; false for non-intersection patches.
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) |/ N* Y/ N$ o5 [. Q1 r! |7 \;;;;;;;;;;;;;;;;;;;;;;
7 I# }3 x! B% m- _2 n+ N" Z4 M;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
4 n y- D$ o1 v;; Create num-cars of turtles if there are enough road patches for one turtle to
5 D- x( o! }- Y& B0 z# H! b;; be created per road patch. Set up the plots.8 t8 B; n5 D# O1 b, p. g ]
to setup2 \0 j& M: }, a. O* s0 Q# D5 `6 K
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setup-globals
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& I4 I6 _. n. X- A, ]. V ;; First we ask the patches to draw themselves and set up a few variables S4 z R. s3 o9 h/ H& L5 m' i
setup-patches
, j$ o" K8 d7 S/ D make-current one-of intersections
1 F& {9 N, u+ ]4 j* N label-current
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set-default-shape turtles "car"
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7 |4 `2 x" H6 v if (num-cars > count roads)% i( I- u# W3 F; Y' z, B5 o
[
/ c4 ?' J0 \% M) d2 a user-message (word "There are too many cars for the amount of "
" `8 X- ^- ~% P" `3 i0 f "road. Either increase the amount of roads "( W i$ k& X. i% X) Z
"by increasing the GRID-SIZE-X or "8 u/ y0 J% w i) h/ V r: t1 p6 s
"GRID-SIZE-Y sliders, or decrease the "
- ~5 m; B: R! E8 v "number of cars by lowering the NUMBER slider.\n"2 W Y. `: }! l% M* Q
"The setup has stopped.")
+ { M6 K4 r x% m' V% c: Z& p% ] stop, t3 B% n+ Y1 b' o
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; I( Z; s6 [3 g7 [( L3 g) s
crt num-cars
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setup-cars* j, q$ ?) f1 C3 W
set-car-color. N% U# \! u9 |: d+ C9 d
record-data% k- M0 v# X/ G8 b6 r7 k+ S
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;; give the turtles an initial speed% b" Y$ B' J9 U
ask turtles [ set-car-speed ]
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reset-ticks( ]# _; n' u5 J* P: G
end) A9 n! E" z+ C% ?( F
* D+ `) ^% z. o6 H9 p* O+ b( w;; Initialize the global variables to appropriate values: B& b; E/ m* a2 P, I3 D" H
to setup-globals
# e8 x4 Y* c% J4 K set current-light nobody ;; just for now, since there are no lights yet
! Q9 a/ h' V8 m: j set phase 0
# O' k$ R( F) ]" c3 W set num-cars-stopped 0
. w! b) s2 u0 ^, x# G i+ ] set grid-x-inc world-width / grid-size-x7 |- }9 c6 q( ?' N1 t! k* p& H1 |6 o
set grid-y-inc world-height / grid-size-y: ~$ N4 H: D2 G) E% I2 I
; q) ^ M- `, o! J, @ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
4 K; n' J6 q" X* c set acceleration 0.099
A# _% S3 S2 {' \end8 F( H3 ^4 e% Q+ o
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# ^" w# u/ d- B
;; and initialize the traffic lights to one setting
- K* m6 T! w4 j a8 R, w8 @, Yto setup-patches
$ E: z; q, z7 j3 S0 P" s! J* v: a1 z ;; initialize the patch-owned variables and color the patches to a base-color' p0 h: v/ B( A& Z, |6 }, F
ask patches" N) o% |7 k0 O, J
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3 Y3 @) u9 [# j# v; d set intersection? false
3 z0 \& ~. l, R+ i7 N } set auto? false
' K& l$ d& `$ j5 E7 v$ B4 }, k set green-light-up? true' J5 Z: { r, `5 W; w0 g
set my-row -1) L- I" W3 R: J! l
set my-column -16 G9 O- i$ T0 m
set my-phase -1* P5 {) o9 t! ? s- s, {
set pcolor brown + 3) ~- G$ i4 B" p l
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;; initialize the global variables that hold patch agentsets
6 x% d' r: O" |, Y! ` set roads patches with0 ?0 j# p0 E( g' T5 |. `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" J5 ^% Q Y; E' J/ t% c( t7 c
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
b! i' J! _0 V0 G% I set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) Y6 x6 P! h* {! w
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ask roads [ set pcolor white ], F3 z: H* I# Y
setup-intersections' b2 U# {# b3 p/ ~
end1 j' {4 C8 ?/ s) W: r
其中定义道路的句子,如下所示,是什么意思啊?
( C" Z* m/ m4 Q+ U% N set roads patches with( R' P( L" \# B0 [8 D% S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' V& E- o$ V3 H (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" f( Y$ _& z0 F1 u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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