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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。
# \( s8 V' n, P7 |6 F- enetlogo自带的social science--traffic grid这一例子当中,, f0 n- k- \1 }+ C3 k
globals
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3 O; U# [- s9 X% I, y* Y grid-x-inc ;; the amount of patches in between two roads in the x direction
; X3 w; ~$ Z' H grid-y-inc ;; the amount of patches in between two roads in the y direction
$ U' l, j8 D( i acceleration ;; the constant that controls how much a car speeds up or slows down by if
/ j$ @6 U2 d q$ m( {- I ;; it is to accelerate or decelerate" k5 E/ {% b$ t( E' z
phase ;; keeps track of the phase \ f7 I5 l; J
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
# ~4 Z% B% z6 v; e \# Z! j# ` current-light ;; the currently selected light# i+ Z( u) v4 x. I' i# \2 Z
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;; patch agentsets7 ~5 U0 p2 U2 W, S1 `) [+ G
intersections ;; agentset containing the patches that are intersections
3 k: a2 P2 E G- { roads ;; agentset containing the patches that are roads1 D* ^% ~0 p/ o# x
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/ P, ^# d. |4 Y8 ~3 Mturtles-own
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% b3 t1 [5 `) r) d/ u speed ;; the speed of the turtle
; b" O+ J, a! q up-car? ;; true if the turtle moves downwards and false if it moves to the right
' R% N0 }3 R( [- Q wait-time ;; the amount of time since the last time a turtle has moved
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patches-own3 B2 [! Y6 h z& m5 V+ P: N
[
2 S2 V7 T) N1 D& \/ ~8 R3 E% { Q% \5 f0 T intersection? ;; true if the patch is at the intersection of two roads6 c: J$ q; Y9 c4 K( H& V) z
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
; O ]$ \" e& f" \! X2 x ;; false for a non-intersection patches.
! W1 V! O v+ k my-row ;; the row of the intersection counting from the upper left corner of the
) ?/ x. G3 {4 o ;; world. -1 for non-intersection patches.+ |2 x1 W+ a$ D" J
my-column ;; the column of the intersection counting from the upper left corner of the
6 N3 l% s1 f8 L4 s- P0 U0 J1 f' j ;; world. -1 for non-intersection patches.; M/ a6 k- A0 d H# v6 z2 R$ {
my-phase ;; the phase for the intersection. -1 for non-intersection patches.: a% Z$ k3 H' F8 `' l
auto? ;; whether or not this intersection will switch automatically.
* p- G7 o* W6 j- X ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;3 f6 S) ]0 L9 |
;; Setup Procedures ;;
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2 Q6 L" T2 z" x5 j( \7 S;; Initialize the display by giving the global and patch variables initial values.
" c7 v/ M: D9 z: O;; Create num-cars of turtles if there are enough road patches for one turtle to, j# e* V* L! ?1 H- E
;; be created per road patch. Set up the plots.
: j# z7 C4 s: u1 u) t- M0 {+ ito setup) |# A- }3 t' F# z3 J
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
2 V* q: M9 l" k5 | P/ t0 ~4 x setup-patches
. z# A: \3 I% f make-current one-of intersections" n! O9 q1 W* D' ^! T
label-current8 [6 p. A8 m c6 e3 m4 r
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set-default-shape turtles "car"8 }, o1 h% U) ], k, ~. D" Z8 {5 t
: m9 m& Q% P2 d0 x5 [* |: s if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "! h# r' x6 T7 T) T! ]1 B, {
"road. Either increase the amount of roads "
5 `3 H7 R2 s% w6 G" h "by increasing the GRID-SIZE-X or "
7 Y& j, r8 A. A "GRID-SIZE-Y sliders, or decrease the "
4 ?4 w9 o. s6 h2 P& D7 Z F2 k "number of cars by lowering the NUMBER slider.\n"* m B& u' |7 I+ A x- h4 d
"The setup has stopped.")
% [( ^' F+ h; R4 G stop9 f+ s" X4 i( p+ T( \
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2 r2 c" _3 e% W8 u) r+ W ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 D/ P& C2 W$ _4 I4 z! c
crt num-cars+ Z" p2 @. d+ I+ h7 m( q* _
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4 ~) X: x. m5 l2 J setup-cars
" T$ J5 q" j( Z# u; e set-car-color5 A% ]6 ~ v k& {4 N+ {3 M
record-data
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/ |, U, N4 q6 |) h+ a% u' k ;; give the turtles an initial speed
& [! E/ Y( i* W4 i% C9 i( R ask turtles [ set-car-speed ]3 F1 |. c f* f4 A M
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reset-ticks; Z2 W) U# W) o% d
end$ o* H# S! m% |9 o+ ?( ?' s
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;; Initialize the global variables to appropriate values! C% i* Y z- Y. S1 s, P
to setup-globals
$ |! O" m' x# t1 O( z; k# m set current-light nobody ;; just for now, since there are no lights yet8 Q( e5 R- E$ s6 z, D, E
set phase 0+ _* D) z- o; S- j l6 k! T6 ~( H
set num-cars-stopped 00 r- J! V2 C. N; ]
set grid-x-inc world-width / grid-size-x
8 m( v1 I5 c4 }# k$ x5 W set grid-y-inc world-height / grid-size-y3 ?+ a* C) [1 W0 }$ r
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" @5 g& O5 E1 ?0 ^ @
set acceleration 0.099- `7 B- g$ X" m( E# y& z, s, d
end! I# q/ B) w4 z, q2 f+ h# b
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 A9 M" t; ~9 |4 Q) N. W$ `/ j0 A
;; and initialize the traffic lights to one setting0 N" L4 I# O; x
to setup-patches
0 _7 T7 v4 U7 m. t2 N+ c+ r ;; initialize the patch-owned variables and color the patches to a base-color2 R8 f6 _6 C& H7 y) K. g
ask patches
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set intersection? false9 i5 W0 Z, f- W; d( K: t; c# ]! z
set auto? false
% X J( i% e6 Y! p2 f. y) S set green-light-up? true5 W ~9 r: K! F
set my-row -1
- w8 N* w; p) H6 s' U" V) T set my-column -1+ h5 p& o7 W; }( F
set my-phase -1+ Q' d2 H @% H H( U* b/ s
set pcolor brown + 3
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5 A% x, ?& _% D* c/ l# d# ^+ G ;; initialize the global variables that hold patch agentsets6 B4 Q6 ]3 k% O g. n/ J
set roads patches with4 @6 Q- p' Y, a& r" n, n6 ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 `+ b, Y. c2 u2 x (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 [* G0 k+ {- i/ n2 C$ p set intersections roads with) n( b9 I. J2 X7 h1 l
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ m3 n9 Y$ y* i7 L& S! P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 c/ i! j/ v6 _. `8 }
- T( \: [5 L$ w- v ask roads [ set pcolor white ]. [3 b m7 z) R
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?1 g* I* k3 P8 Y& W2 a9 x
set roads patches with
1 Q2 ?: q- s2 L* Y1 E( c+ F7 T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 d& z5 r$ s7 t% e8 h; }4 S( k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 j* x8 m4 s& K) r$ Y5 w" {) T
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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