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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。
3 B) C) a- i" h4 @% A M9 f: Q* }7 }netlogo自带的social science--traffic grid这一例子当中,
0 d: O. ^, K! [3 e) x+ p+ hglobals
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, Z# ? A! N* g) B7 i grid-x-inc ;; the amount of patches in between two roads in the x direction
9 n9 C2 M ]( N+ J4 y6 R" Q! i) } grid-y-inc ;; the amount of patches in between two roads in the y direction3 ]. ^0 u; z- e4 g7 k) h# f" L
acceleration ;; the constant that controls how much a car speeds up or slows down by if
" x# R" x$ T6 I ;; it is to accelerate or decelerate
1 K+ B9 X7 \3 y7 x0 J, Y phase ;; keeps track of the phase8 W& q: m8 ]& W" k
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure n$ Y; y0 _+ r5 |* ^! t2 Q$ a/ z, {
current-light ;; the currently selected light; Q: e" o, f+ C! \. k' b/ Q, Z6 K
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;; patch agentsets1 i' k' Q8 E: y, z0 r
intersections ;; agentset containing the patches that are intersections! D5 [+ L: W7 K6 @- w
roads ;; agentset containing the patches that are roads3 O1 Q/ ]8 K5 \" W! M' C4 t
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# c0 p! P" u) L W' mturtles-own
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* X. D/ l4 E# Q- k speed ;; the speed of the turtle) n1 }% }. `* w9 u, V
up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ B- g6 x3 e, r wait-time ;; the amount of time since the last time a turtle has moved. w( w: x! c; P! x6 @) W
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% h: J; X& k* O4 l. vpatches-own
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1 ?1 a/ Y4 g, V! O1 g intersection? ;; true if the patch is at the intersection of two roads
" l5 @. D! N- v7 Y green-light-up? ;; true if the green light is above the intersection. otherwise, false.
! C- n, D' s, q/ l5 e$ V* t$ O$ G! i ;; false for a non-intersection patches.
?: G" c& M+ a$ b my-row ;; the row of the intersection counting from the upper left corner of the3 B; e( s! d8 d" G9 E# _
;; world. -1 for non-intersection patches.0 A5 G) Y1 J7 q T4 V' @. j
my-column ;; the column of the intersection counting from the upper left corner of the# _$ z/ Z7 Y, J/ i
;; world. -1 for non-intersection patches.
4 r: [9 v1 A- [6 o, r0 [+ k my-phase ;; the phase for the intersection. -1 for non-intersection patches." e5 S7 _0 f7 a; B0 `
auto? ;; whether or not this intersection will switch automatically.* Q; N8 }. ^; A/ q- L; V
;; false for non-intersection patches.4 G) w$ b: I8 z) {" w% r
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;;;;;;;;;;;;;;;;;;;;;;
- s1 f6 j: n2 s- U' w. x;; Setup Procedures ;;
/ R7 W6 Q' W3 z, V5 D( _) {;;;;;;;;;;;;;;;;;;;;;;) h+ S' R: Q. m9 D: E0 e9 W
" @' m/ p& M* C& S0 z2 O6 g6 a;; Initialize the display by giving the global and patch variables initial values.$ u# W/ h' R' c- s/ P
;; Create num-cars of turtles if there are enough road patches for one turtle to2 Y9 k5 C& w7 N/ N: [/ d! c
;; be created per road patch. Set up the plots.9 x: p, R/ W' L$ f
to setup
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% I E8 ?* q- ^ setup-globals
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;; First we ask the patches to draw themselves and set up a few variables& X2 H: W1 E$ b: c# K
setup-patches
' h& `* X+ b1 Y- @* `* v make-current one-of intersections
5 _0 U( _7 j W. X/ c- V% Z7 A label-current& Y( I" y1 T4 }0 r
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set-default-shape turtles "car"5 @ Y7 g( h$ r: T
" U$ @; [0 H6 \ if (num-cars > count roads). O: t$ \5 ^8 \6 t
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user-message (word "There are too many cars for the amount of "/ j( U4 _7 D1 e' l
"road. Either increase the amount of roads ". e4 {: Y2 R4 q) I5 I1 F
"by increasing the GRID-SIZE-X or "/ |' @0 d) o& ^9 C' C7 D
"GRID-SIZE-Y sliders, or decrease the "" ?7 j# ^( H( N0 c- ?" }3 l
"number of cars by lowering the NUMBER slider.\n"
# [, \+ s8 Q) L% n! \: o' i% T- D "The setup has stopped.")3 ?( O5 a1 o6 Q7 X, u0 k
stop/ K u( d, b5 {6 W% ?8 t/ ~* A
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! Z9 h! q! D' [0 X' i crt num-cars& ^$ Y4 I9 T1 B6 n1 l
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setup-cars$ m/ W; I) `, q M& Z$ Z$ z
set-car-color4 N0 _1 C2 z) G) k F
record-data& `6 i& M/ h9 K! j8 C9 k; j: f
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) W8 Y1 m" }9 [" W# Y! i ;; give the turtles an initial speed# c+ G, b, Z& a2 A7 [" w
ask turtles [ set-car-speed ]$ r# ]8 k* T& A3 A
% O7 a6 C2 O' X# ?6 B reset-ticks
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/ ]/ g: q i$ U8 t0 H- b7 ~* G;; Initialize the global variables to appropriate values0 [/ c3 ]2 r2 E7 L1 N2 v
to setup-globals
! k9 `7 j# Y: c) {* a set current-light nobody ;; just for now, since there are no lights yet
0 N+ m2 ~7 {; k S( F1 v; v set phase 0, w: Z$ e( {, ]5 W, @
set num-cars-stopped 0& [( O1 V0 \. i! @- }4 t6 a
set grid-x-inc world-width / grid-size-x
' g, y0 Q9 Q, [' m! h set grid-y-inc world-height / grid-size-y' J$ F% p) O: g! U- r6 w/ { C; q
- q6 E5 o8 f) k9 o0 d# i ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 R& M4 `+ ^ K1 g1 ~1 V; n
set acceleration 0.099
4 P0 g' ~* k, ]+ T* y# g. q: Oend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 M% m1 b/ `2 V# D, ]: S5 K- E;; and initialize the traffic lights to one setting5 T5 a$ Q* m3 m1 O
to setup-patches
; }2 }9 |) Y A ;; initialize the patch-owned variables and color the patches to a base-color
+ ?, H0 w( C, m3 L7 u8 F! X8 H ask patches
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! h' `! n9 ?; Q& ^8 v1 R( X set intersection? false! y( }6 h. i1 c* u: p
set auto? false
7 ?$ @( n5 T2 O set green-light-up? true5 ~. I' g/ ^. Z# o; i; G* w
set my-row -1, M8 p# N1 b) e' q
set my-column -1
! {8 M4 L% I! X `6 c* a/ k set my-phase -1! O0 N5 X" O% h1 g
set pcolor brown + 3
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' k! b- {, T8 `$ m) G u8 E ;; initialize the global variables that hold patch agentsets/ E+ p$ e4 W- f" u% {5 S/ P$ i
set roads patches with
6 c8 g3 c6 P* x( u3 l. c1 y: S, w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ v3 D$ \2 i4 h# n2 r% r9 h
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: C/ J! Z5 I" ` J \+ U p
set intersections roads with
# F {8 `0 X7 B( O [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ p" ?7 p) O. j% a1 x% \9 [
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
6 i6 Y% G8 z3 n* U5 V; R0 t5 N setup-intersections
' o0 m$ i6 U4 z0 @' O0 |( qend
% n6 {9 E/ X7 M% A其中定义道路的句子,如下所示,是什么意思啊?
9 ^# P7 Q! ~3 c7 c' R set roads patches with
5 K) d/ a5 s) ]2 e. B9 l2 ^ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" P4 m4 x: t) ~& H" R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 T5 d% L% c$ O; S( ~6 {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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