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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。
2 g/ t. I, S0 n1 { Anetlogo自带的social science--traffic grid这一例子当中,& @3 M6 h& x7 I$ a0 @
globals- R: @+ l: p1 M
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grid-x-inc ;; the amount of patches in between two roads in the x direction; n& @( T( k7 w* R
grid-y-inc ;; the amount of patches in between two roads in the y direction" h/ _& ?5 S2 K
acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 e, @6 f6 T. I0 P% I7 v ;; it is to accelerate or decelerate2 K* H& P f+ ^6 ?2 y( ?2 X
phase ;; keeps track of the phase' G0 ], B7 ~( U! R- A' e3 H) L- F
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
1 Q+ {; ~, Q/ D& [* k2 E current-light ;; the currently selected light4 J3 `% ], T. n& S4 }" ^8 I
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;; patch agentsets6 q4 Q0 }2 r- n; r
intersections ;; agentset containing the patches that are intersections
- E& O8 \' _: S3 P roads ;; agentset containing the patches that are roads
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turtles-own( j( s/ o% ]- w9 z' o
[
9 Y7 n. x: R9 f! A speed ;; the speed of the turtle
3 s3 t, `3 B1 Z+ J8 A" [ up-car? ;; true if the turtle moves downwards and false if it moves to the right
$ V }; t3 G! d }( z/ A: ^ wait-time ;; the amount of time since the last time a turtle has moved! L+ X/ T6 T# \
]
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6 ?- G6 F. i8 X5 P% E5 N$ xpatches-own
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: B7 I/ a6 ^- ]; u- Y- K! c/ P intersection? ;; true if the patch is at the intersection of two roads
7 e0 N, s* ?' } green-light-up? ;; true if the green light is above the intersection. otherwise, false.- m1 H; I5 o% Z% p. @4 ?
;; false for a non-intersection patches.
0 ~2 X y- r& t4 u9 Y+ q" K5 V my-row ;; the row of the intersection counting from the upper left corner of the0 ?/ }6 a! S9 O3 s! l% _
;; world. -1 for non-intersection patches.
: }6 ~" ~% \4 @$ R Q' i my-column ;; the column of the intersection counting from the upper left corner of the
0 D! |0 s) Z1 T! r4 @ ;; world. -1 for non-intersection patches.; Z W5 w; b: z8 J3 S0 Z* e
my-phase ;; the phase for the intersection. -1 for non-intersection patches.- L: w& C8 p; I6 p# m G
auto? ;; whether or not this intersection will switch automatically.
+ I: `1 m* d3 I: J ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
3 k# B$ D8 G5 l* B6 P6 `9 ^;; Setup Procedures ;;
4 P) @- N2 v E0 h;;;;;;;;;;;;;;;;;;;;;; ^2 g X# I7 n; Q" a
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;; Initialize the display by giving the global and patch variables initial values.
/ S7 h1 {! h/ {0 x% q;; Create num-cars of turtles if there are enough road patches for one turtle to
7 A4 E0 V8 G4 W6 K# K$ Q$ T% p;; be created per road patch. Set up the plots.% D+ G1 H- ? \( Z
to setup+ _. k7 ~4 w+ s# G4 S, J
ca
, J7 C+ q% C, p! w+ N setup-globals
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* O" \) V; p) Z* @ ;; First we ask the patches to draw themselves and set up a few variables
3 f& D u/ D% P1 k+ d+ e, j setup-patches. Z; e, r9 | [+ ]2 o+ }5 l& b
make-current one-of intersections
" w- z. J& r$ |' _' B label-current1 U$ t& ~8 h2 u
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set-default-shape turtles "car"
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: p) A$ i: G) Y+ }8 Q if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "$ ^8 [ M: j2 [. ^0 z$ c
"road. Either increase the amount of roads "
/ _8 H0 g. ?! E& Z9 t2 v: f "by increasing the GRID-SIZE-X or "
% p x, D% H$ e- w& h: Y, W "GRID-SIZE-Y sliders, or decrease the "
4 [+ j- B. A# H& q7 P "number of cars by lowering the NUMBER slider.\n"( n% v8 l( S. i& Y
"The setup has stopped.")
3 X0 ?0 V- q# Z5 H% F stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: D1 q4 T/ U$ ^5 g3 \
crt num-cars1 ?# {8 \& [, ^6 v M. q J6 |# ]
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setup-cars
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* }2 {2 w2 P, O3 j& Y9 r1 g. k# Q record-data
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! I1 X% G* X) N2 o4 N \0 N+ b ;; give the turtles an initial speed
0 d/ z2 ~, W, B, P7 t6 E9 U ask turtles [ set-car-speed ]
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reset-ticks/ G7 q, Z, {, d+ j' M, K) O4 h
end
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet) {4 Y- B- M4 E2 W: Z! x
set phase 0
. y' t8 `% f( L7 D2 v8 I) y7 V set num-cars-stopped 0
4 F4 t7 v9 w6 c# | C set grid-x-inc world-width / grid-size-x
9 H. I, n8 U4 s3 }1 W/ K3 m6 |% i set grid-y-inc world-height / grid-size-y5 t$ P4 k' F" B8 w" L
4 Z u; K. K( n; E ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
4 v8 S/ j5 ^0 K A; D set acceleration 0.099
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7 p; I) R8 f: c4 e' ^;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* \$ `9 P" z* C) c! O4 `;; and initialize the traffic lights to one setting
, S* ?2 H- E! V7 K+ Fto setup-patches- ~& A0 z0 H* |7 L0 [/ Y0 b* ~
;; initialize the patch-owned variables and color the patches to a base-color
; a, `" J& E. K1 W6 ]" a ask patches4 \5 U" ^! _* d, M7 w7 ~. A
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set intersection? false
/ ?/ y; j+ B$ f" b& q. m, U set auto? false5 o* a) N3 U1 ?$ |, ^6 g
set green-light-up? true. h1 K: e; o7 E* f3 v4 I
set my-row -1
# U! I) W" l' U; i9 l4 ~: y set my-column -19 c4 a2 Q& A$ |7 B+ C
set my-phase -1
% |9 e# l1 ` p5 p( L" X' u set pcolor brown + 3
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0 q; w: y. _( x9 ]. Q" Y ;; initialize the global variables that hold patch agentsets2 |" C, b2 X! Z
set roads patches with
# b: d# F- e3 e+ d3 I [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ \( c7 y" D2 a, T (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; J( D' z8 M# a3 [
set intersections roads with) H% c# W1 v6 @* y7 Y& R( i
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
% T1 R) r+ p1 h( Y8 P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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7 t; s( e8 V5 d- f4 O0 }1 ` ask roads [ set pcolor white ]
6 f9 d0 v6 D2 B% u+ @ 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?
! o- z( W8 ]. |/ [8 a. P! h set roads patches with
# M# z1 T0 s: K4 m6 w3 h! s [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! {+ o- w Y1 r3 K9 g (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; j8 |* N, R( T: x5 E% G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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