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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。
) \9 i" I( T+ P& [6 L8 @) _( lnetlogo自带的social science--traffic grid这一例子当中,+ q) o7 r& B1 {& n# _7 X W" `
globals4 x6 X4 w, L. d% x" x& V3 N, n" X
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grid-x-inc ;; the amount of patches in between two roads in the x direction
$ o# c. l( a0 {: P7 w8 i grid-y-inc ;; the amount of patches in between two roads in the y direction7 a7 n* ~, Q! I8 _1 l
acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 l) Q8 Z( d* ]- G& ^% u, z+ Q% N$ V ;; it is to accelerate or decelerate
2 H% _' a9 o* d" b phase ;; keeps track of the phase( d. q/ o/ Z _' E# u+ z1 C
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure# J" i1 V2 {2 R1 {* O6 L
current-light ;; the currently selected light
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9 o- {7 I$ [' ^' @! Z$ L: r ;; patch agentsets. T: j; d0 `8 `. l' x. H- U
intersections ;; agentset containing the patches that are intersections, k2 k! Z, ?) d; e$ E0 e8 [
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle0 J! f6 L7 H' x' ?- h
up-car? ;; true if the turtle moves downwards and false if it moves to the right
k# b* Q" Y, e: F wait-time ;; the amount of time since the last time a turtle has moved
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$ i( q' [8 t1 Hpatches-own* k ]6 _' [$ k3 E7 B! p
[
2 h* ^0 X" @8 W5 @ intersection? ;; true if the patch is at the intersection of two roads
8 m; o& g/ X# d. L$ G green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' A3 T+ ]3 M! o$ u+ Z" C6 H8 g' O ;; false for a non-intersection patches.
; {9 @! h( z8 ` my-row ;; the row of the intersection counting from the upper left corner of the
2 s8 D" Z# A0 `" a4 e. c5 a ;; world. -1 for non-intersection patches.
0 W2 Z$ |3 D4 T% D% N my-column ;; the column of the intersection counting from the upper left corner of the! H# c0 O& O/ P0 w
;; world. -1 for non-intersection patches.+ m3 N9 G2 G* S8 n- v1 H+ I# J1 E
my-phase ;; the phase for the intersection. -1 for non-intersection patches. e/ _: E0 ^ ~1 T, Q. }6 o
auto? ;; whether or not this intersection will switch automatically.5 b' ]( s8 C6 e; M
;; false for non-intersection patches.
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( Z' L1 f4 ?" T, K, C7 h;;;;;;;;;;;;;;;;;;;;;;0 B" u1 B# N2 K1 a3 X3 N
;; Setup Procedures ;;7 K! |. X& a5 ~1 U8 S' s- Q% a
;;;;;;;;;;;;;;;;;;;;;;
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7 [! r s* _ s' V/ [;; Initialize the display by giving the global and patch variables initial values.) u+ m9 e: D8 F3 J' {
;; Create num-cars of turtles if there are enough road patches for one turtle to" {/ b2 @7 H9 U; F: [, n' z
;; be created per road patch. Set up the plots.
: S# i# ~4 w! o3 hto 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 t: }0 i. S9 Q; Y- B6 ~5 Y3 m
setup-patches
* ^) N8 h6 w f make-current one-of intersections! e. o! W! r5 k: J# E5 ^" I8 _3 _
label-current& p! U, @* p" t! B3 C" o7 |
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set-default-shape turtles "car"
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! \3 t: |- M. w5 {1 L- H) X" U if (num-cars > count roads)) |- d e [: I
[
1 H; G3 Z- [5 z- u9 `1 t5 y ] user-message (word "There are too many cars for the amount of ": n# u E! b7 c. h
"road. Either increase the amount of roads "
6 `/ S" I! F" f1 @6 `8 g "by increasing the GRID-SIZE-X or ", k% _& ~( F8 d; H$ T+ K
"GRID-SIZE-Y sliders, or decrease the "0 ?; e- n5 w! ~) [; M! c) C
"number of cars by lowering the NUMBER slider.\n"
1 K6 z- S+ H; z( l "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
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setup-cars$ l7 S. x. [/ |
set-car-color* F' F* d3 ?" v
record-data
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;; give the turtles an initial speed
! Q5 u! Z' a, S4 J' I" k. ]* N ask turtles [ set-car-speed ]
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' ^% l$ B* B1 _9 T( ]! e/ ]* t* a reset-ticks8 @8 J8 A: ~& n/ K4 | y
end
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8 r' `: M5 t5 H7 ~0 D$ p6 f;; Initialize the global variables to appropriate values% ~5 G$ @% ^7 _( V# S
to setup-globals
0 \- n& T% B* Q" |. m/ R set current-light nobody ;; just for now, since there are no lights yet: w- P7 G/ M& h0 a. a$ M
set phase 0, S1 E; o/ b1 P0 F: g" T$ U. W7 \
set num-cars-stopped 0
h" M! L2 D4 E0 o. I5 f: d set grid-x-inc world-width / grid-size-x
; ?) b9 R S2 H6 g set grid-y-inc world-height / grid-size-y3 X T9 i. V. I, m% x( F* m" L
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: I$ A* Q" s. B3 I. n% ^- a$ } set acceleration 0.0993 |8 i6 @9 T; i5 z
end$ j: t7 `8 W$ M$ c7 i
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,1 j1 Y0 b" `$ K* A
;; and initialize the traffic lights to one setting: d% D9 x. i' \! @2 }. i
to setup-patches" |" m, Q1 k5 Q$ P( |, \
;; initialize the patch-owned variables and color the patches to a base-color0 ~/ Q% o8 ?6 X9 K+ O" J2 O `
ask patches3 w# P! f/ e/ x- Y1 b1 m
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set intersection? false) C3 b/ O9 R0 ^% c' h; X# o
set auto? false
( S3 `/ d; _8 n% C set green-light-up? true& x) s8 [5 m8 A
set my-row -1
& l; Z3 H2 a# E7 @# ~$ v% ] set my-column -1
/ G5 E, l, {) j set my-phase -1
% V( a+ l7 P! g- I% {: W# G* `0 i set pcolor brown + 3
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/ U( `4 R/ Q9 H4 q ;; initialize the global variables that hold patch agentsets/ W; M3 \, N7 O9 k
set roads patches with: `8 @5 H8 Z9 q7 V0 I6 I: u* p
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ @ V* ~4 F/ ]" W8 G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" I/ \/ j( g P5 p! G, ?
set intersections roads with
3 N/ t1 _% H1 g7 x% f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; l3 N! @( \& {# D% `5 t* W (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?
: X- k; X5 {' j1 z set roads patches with8 \2 ]6 i, S* O0 x9 J0 K w* v5 L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 e2 P) l; g0 z& b- U (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ O! w& l: R. b. N# y
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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