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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。
, L8 I0 l$ F5 _* b; Z+ cnetlogo自带的social science--traffic grid这一例子当中,
( L2 X2 L( f4 o, b- Qglobals7 j$ v4 ^9 h6 j0 V# e
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1 \" K: z. T$ h) y: M" r1 i grid-x-inc ;; the amount of patches in between two roads in the x direction% M4 \. _- F" j" ?3 o' M3 v9 T8 V
grid-y-inc ;; the amount of patches in between two roads in the y direction$ `0 ^! x3 J! N) Z; }
acceleration ;; the constant that controls how much a car speeds up or slows down by if+ d: k, q7 C& h: U
;; it is to accelerate or decelerate
9 t4 I: E; F ]# @5 \) u. _ phase ;; keeps track of the phase
* k3 q) N" S. p; S num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure7 a, M; z4 S, | c- v; {1 E
current-light ;; the currently selected light
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;; patch agentsets9 V+ N( A7 H4 n
intersections ;; agentset containing the patches that are intersections
# g0 h+ J G$ \% H8 s roads ;; agentset containing the patches that are roads+ q( z( D L' {+ H, F- N
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turtles-own# b9 ~# [1 X, a
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7 W: R, i V" A' a9 T speed ;; the speed of the turtle
0 g9 s* X- _/ r7 |0 C! Z( E up-car? ;; true if the turtle moves downwards and false if it moves to the right, J5 o& D( \0 c) N6 A; i: @
wait-time ;; the amount of time since the last time a turtle has moved* `' V) d, p4 ^- c- F5 F
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patches-own* R+ Z. q% d* ?5 K8 t( j3 J
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intersection? ;; true if the patch is at the intersection of two roads( B! |6 `- x F$ i* o- _1 T/ T
green-light-up? ;; true if the green light is above the intersection. otherwise, false.( w6 C- e) p5 X6 Y
;; false for a non-intersection patches.
7 t$ M( g* y( @7 e6 U) v my-row ;; the row of the intersection counting from the upper left corner of the" b9 ?& q2 |2 o" B. ^
;; world. -1 for non-intersection patches.0 w1 l) L4 `3 d3 t. j
my-column ;; the column of the intersection counting from the upper left corner of the
" {6 j/ l. R! g7 I* d ;; world. -1 for non-intersection patches." A5 r! g6 K# L7 u, K% @/ x" _6 V2 Q: j
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
) }, R$ {9 L' W) L9 g) P4 d auto? ;; whether or not this intersection will switch automatically.7 H/ L5 p7 |( O. Q I
;; false for non-intersection patches.
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0 Y7 |0 T7 |) d0 `9 \; o;;;;;;;;;;;;;;;;;;;;;;' q4 v1 A m0 J2 N& d% j( c" z
;; Setup Procedures ;;; w! X2 n' K9 `. i8 M! d
;;;;;;;;;;;;;;;;;;;;;;
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! c m5 \+ B* s1 i7 t7 ^/ f;; Initialize the display by giving the global and patch variables initial values.) g- g6 Y' B/ O4 m6 G; Z
;; Create num-cars of turtles if there are enough road patches for one turtle to2 k% N+ q/ y8 E' V
;; be created per road patch. Set up the plots.
- M& h* r9 o; `, yto setup
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. W( @) L1 n$ b: I1 \' g setup-globals
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f9 o4 ?8 R( g8 M- B ;; First we ask the patches to draw themselves and set up a few variables
0 i8 @: v5 t( z0 Z& B setup-patches
# G# v( E9 w( x2 \& p5 Y% k make-current one-of intersections' b' n( R* |( i
label-current7 A; X8 Z0 b( @
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set-default-shape turtles "car"# `( I* n! R r
# r4 ?" A% W [( t if (num-cars > count roads)0 o( `, a" Y9 T7 ?" a
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3 J# @+ g* @# a* R; e* n! B5 f user-message (word "There are too many cars for the amount of "! Z0 X$ ^; f% @) i/ v
"road. Either increase the amount of roads "
% ]* }$ D* n5 _0 F% x- Y* N "by increasing the GRID-SIZE-X or ") M" T* `2 C& c5 w9 m, J- z
"GRID-SIZE-Y sliders, or decrease the "+ }& e, x5 _/ y
"number of cars by lowering the NUMBER slider.\n"9 N+ }+ p% H P( [
"The setup has stopped.")4 s; E! T) R/ d, H! I; Y
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* t# e, L$ @/ j% ^2 z" H
crt num-cars
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setup-cars
+ k/ ]) F( A* a1 P: w set-car-color
% L. R' g4 }2 `, j record-data
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;; give the turtles an initial speed
# H6 l$ e9 R, _- A! C ask turtles [ set-car-speed ]
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reset-ticks# M0 B5 Q3 \4 q; ?
end' X) d% k3 A( A- I! k
- H% R5 J8 z4 ]9 J$ g/ c+ _;; Initialize the global variables to appropriate values
7 T1 \0 }" U. D, a! Zto setup-globals: H" D( D3 O8 g f, S
set current-light nobody ;; just for now, since there are no lights yet
- W I0 b& b0 A2 P set phase 0
# m. w- i7 T/ E' |6 G- W0 v set num-cars-stopped 0
+ P) g/ [: q, ?" }' i& M set grid-x-inc world-width / grid-size-x
/ B9 Q; n" v# w( N3 t6 j! m, t set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 D5 K9 g I7 h5 U% z; q set acceleration 0.099
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2 k- Q8 e8 w0 ^) u; q/ }6 A;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; r% P# H0 c" \;; and initialize the traffic lights to one setting) i1 g8 G, ?8 x9 Z F+ H
to setup-patches1 R5 l- q$ [$ l) ?! Q
;; initialize the patch-owned variables and color the patches to a base-color
* Y5 c+ u3 c4 _- Z2 y/ e4 a ask patches% O0 l; @ s$ Y( z: p8 j, u4 X
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set intersection? false2 u5 @* j4 ^( p% V- P
set auto? false
# c5 z0 F7 [9 C* q) J+ B$ n) y# H set green-light-up? true- M5 C) }" M& W
set my-row -1
2 L6 B6 @+ m/ s, s* t9 a set my-column -13 `& a% R2 J* c
set my-phase -1
4 N' o7 S, P' G) t set pcolor brown + 3
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) e# s' }, W( o ;; initialize the global variables that hold patch agentsets% e$ R9 I' y" Z* T$ p& I
set roads patches with
- M+ z/ `& H4 c- b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% v: u7 [/ |7 t0 f6 K1 u' y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; q0 n& P6 X% l2 o0 j1 E; \ set intersections roads with
$ Y' G! {' u5 ? [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and' H/ \0 C" N" U) [8 x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 f4 {5 z/ i& C: C% @
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ask roads [ set pcolor white ]
2 f) U; E+ C: W1 K/ p2 p 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?
, c H F, t/ b; C* e- v* V set roads patches with
4 Z* [7 G# Y8 B& f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 ?1 L0 e# z# h; L- S- K x9 v0 V (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( l. Y* _- `9 U; z! t( F& 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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