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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。
! u+ O |6 Z" `) n' @8 }% a5 anetlogo自带的social science--traffic grid这一例子当中,; p8 [) \. M: |& C% {1 ]9 W
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
z9 K4 R' v, x* ^; |5 \ grid-y-inc ;; the amount of patches in between two roads in the y direction. v" U( z3 J/ C# i v/ h& L
acceleration ;; the constant that controls how much a car speeds up or slows down by if' \# N) j9 p+ L0 a
;; it is to accelerate or decelerate* T- _; x! }8 i8 Z8 d
phase ;; keeps track of the phase) ~( O6 h" H1 F+ Y
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure M. y9 o' v+ [ s0 _
current-light ;; the currently selected light
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5 a7 i3 B4 J4 d8 Q ;; patch agentsets7 Y8 Y, F8 J* T
intersections ;; agentset containing the patches that are intersections. j3 |" Z2 R0 v* [
roads ;; agentset containing the patches that are roads/ j( J1 m) Y. I7 `% s6 x |6 Y
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% E- e/ u5 Z2 h+ B/ @2 \$ xturtles-own. n3 U; u& }( K+ C, U' K8 _
[
' Z2 j7 ~/ s, L speed ;; the speed of the turtle
3 Z- z2 I+ R9 I( l up-car? ;; true if the turtle moves downwards and false if it moves to the right
g: U4 F; {# k# I. S# I6 { wait-time ;; the amount of time since the last time a turtle has moved
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patches-own1 Q( k) d# j# N6 \
[
9 B/ \9 Y2 R2 r intersection? ;; true if the patch is at the intersection of two roads7 L8 A% D; m _! {6 m
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
& ^( A5 r; H& v ;; false for a non-intersection patches.
& y0 ?* v/ T4 e* g$ f9 l/ X, Z my-row ;; the row of the intersection counting from the upper left corner of the+ d: [2 g" _; }) W0 \) x
;; world. -1 for non-intersection patches.
9 M* q# f3 b& Y) Q0 F my-column ;; the column of the intersection counting from the upper left corner of the5 }" c1 ~: ^5 ` s+ Y
;; world. -1 for non-intersection patches.2 \" [. P$ R; c3 f1 i5 {
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
% x9 V6 r* i) N& y auto? ;; whether or not this intersection will switch automatically.+ g5 F( J e" A! Q
;; false for non-intersection patches.- i* G" }2 _; h/ J( u) n
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! j1 t7 H+ r$ c/ f$ _% R- A6 A;;;;;;;;;;;;;;;;;;;;;;5 W( f# j! f* C8 l* E
;; Setup Procedures ;;0 ~, Z- ?, ~) Z7 ?
;;;;;;;;;;;;;;;;;;;;;;
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* j7 [# ^3 `; a3 B2 k;; Initialize the display by giving the global and patch variables initial values.* F1 @; N3 M( g
;; Create num-cars of turtles if there are enough road patches for one turtle to
3 i# x0 Y) B1 S5 p;; be created per road patch. Set up the plots.& ]) v' @! @- x" V7 [
to setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables2 G2 l4 H. k- M4 c ^
setup-patches% s- ?2 N/ B9 B3 g' {
make-current one-of intersections
3 Z5 u7 ^: v$ f3 h& a2 D label-current
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% ?. h$ n# Z( d; D! U* U! e set-default-shape turtles "car"3 Z* ~* @* m& a3 Y9 A5 j
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if (num-cars > count roads)& }, L" \7 c8 F( A' D
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+ B( b# ~/ _( ]" ~' f& f2 z" X user-message (word "There are too many cars for the amount of "
* r* I$ I$ d# r* c, q4 T "road. Either increase the amount of roads "
* W, Z* X8 S7 X( n$ A/ }; U "by increasing the GRID-SIZE-X or "' _/ P; B! O8 M, K' {9 y
"GRID-SIZE-Y sliders, or decrease the "
7 H- r5 ?% j- E: i& z( v6 | "number of cars by lowering the NUMBER slider.\n"/ K+ t4 q! `: s' G! b
"The setup has stopped.")
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]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ d" b5 w4 M- q; S
crt num-cars7 e& ]$ d7 ~% ]. }# m3 x
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setup-cars1 G/ G" K6 j" v0 E" T# r
set-car-color
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;; give the turtles an initial speed
5 c E% o3 d+ |9 u& X$ } ask turtles [ set-car-speed ]
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; L7 o, B$ m" m/ `: a& v: B& ^: G reset-ticks- H4 P/ W) r0 L& R
end8 ~' Q. I d- q" }! F( y
% l3 O* b3 T! G# |;; Initialize the global variables to appropriate values" G/ a0 M4 g1 v( y
to setup-globals
: s6 D4 |6 z5 E' X% A set current-light nobody ;; just for now, since there are no lights yet# ^& {2 r. E9 Z. H3 U( ]% B8 Q
set phase 08 E5 Z `% l7 f) v" M) R
set num-cars-stopped 0% Q( C! M/ F h3 ]5 Z
set grid-x-inc world-width / grid-size-x2 ^% j* b5 d, |
set grid-y-inc world-height / grid-size-y z: x1 o6 Y: W; k9 H) R4 w
# T- [5 d/ N! { ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) j+ H2 m- T& P9 o; f; q set acceleration 0.099
* O ~( @- `- m8 Rend
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/ T, z; e) Y; Q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 |. i+ q; F8 _. d;; and initialize the traffic lights to one setting
; }) T" c% ?8 uto setup-patches
) z c. ]2 F N4 T% S: Q7 t ;; initialize the patch-owned variables and color the patches to a base-color
" T. C5 R+ e/ _7 s5 G, E0 I, t) e+ j ask patches) e5 r2 r3 j" {# s: n7 n" y
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set intersection? false+ @% @) ~/ {) k: R8 s# b* y
set auto? false! k9 b: x7 M) G) H2 ]
set green-light-up? true
* n' z* b" u, I# M! l set my-row -18 w; T# I0 v( M0 e
set my-column -18 R. d r1 t, e, ^
set my-phase -1
* u1 q' h( f& V& w, B; y set pcolor brown + 3
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* x* I$ K7 Z2 `# ^/ G* h ;; initialize the global variables that hold patch agentsets
* J6 O$ `3 R1 T7 R8 M5 S set roads patches with0 }+ ^! H+ ?+ E8 d$ V6 s2 ~0 P& e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 H8 Q# |7 M/ c, p* G( } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! g6 |! \7 V: [3 i8 } set intersections roads with
( }) o9 x. s9 n v: q! a [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" h4 T. d! J; m4 E& l+ q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 z! d# C! ?) J' F! p6 C9 z
" `# E, D3 f0 J w0 d4 H% a( @ ask roads [ set pcolor white ]2 A! J: o: A& t9 ~- [# I* o- i4 V/ a
setup-intersections
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; z% v7 B8 q+ F5 P$ C2 I其中定义道路的句子,如下所示,是什么意思啊?
1 u5 @- G4 ?" j set roads patches with: O$ W0 b5 r/ G3 Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 H# h' V3 j( t% T- R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) y( f9 B2 ~( h- Z' {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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