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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。
& ^+ R- N4 ]8 ]6 W; qnetlogo自带的social science--traffic grid这一例子当中,
" ?) F+ s( J! ~/ f% j; A. D/ Qglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction/ b( o+ t/ I8 T& i
grid-y-inc ;; the amount of patches in between two roads in the y direction
9 j9 q9 k* Z8 {+ V" l7 \5 @ acceleration ;; the constant that controls how much a car speeds up or slows down by if
. U/ B3 Y( C# Y, ]3 k* H ;; it is to accelerate or decelerate8 u. i8 g8 I# V/ k" y
phase ;; keeps track of the phase
" c% A s0 `- `: E num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 i8 F# R1 X5 G+ Q- z! p2 Q) U
current-light ;; the currently selected light& a* c' A2 {8 U9 D; |
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;; patch agentsets: O4 ` t$ j$ \
intersections ;; agentset containing the patches that are intersections
" E; S. U) S. \ roads ;; agentset containing the patches that are roads
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turtles-own
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R M8 K% Q7 p speed ;; the speed of the turtle
$ N! N& q4 x& t! j* T+ Z2 ? up-car? ;; true if the turtle moves downwards and false if it moves to the right8 F7 |0 m, I8 X7 ?. z1 w
wait-time ;; the amount of time since the last time a turtle has moved" T2 v! b$ L V2 }. z
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/ G$ T0 Y( U4 f9 J1 D4 ?patches-own; H( R3 g/ C1 m5 _% u* V
[
6 Q6 O Z. w- P$ t* S: K intersection? ;; true if the patch is at the intersection of two roads
$ A y. v) K5 y+ P, q% _7 z4 b9 t green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 }/ R" {2 ^! ]3 U
;; false for a non-intersection patches.4 e) B7 P6 R* t" U6 _$ I7 l
my-row ;; the row of the intersection counting from the upper left corner of the
* h# J+ {/ K% S1 r! v, N# q ;; world. -1 for non-intersection patches.; j. Q6 z% q% \8 s2 O
my-column ;; the column of the intersection counting from the upper left corner of the4 P% F4 D) x# X. s: e* x$ v
;; world. -1 for non-intersection patches.6 A' ?+ r# D& E4 n% a% ^& n
my-phase ;; the phase for the intersection. -1 for non-intersection patches.. b8 E9 C2 a4 t, S6 R& g4 b& l
auto? ;; whether or not this intersection will switch automatically.
6 P7 }8 `( c# @& J0 s% G8 G ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;, g5 k* i3 `6 l( f& t9 s1 B
;; Setup Procedures ;;
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6 A. a. K5 i* h, d% O;; Initialize the display by giving the global and patch variables initial values.7 F1 O+ h4 W+ g) W1 `5 w9 h
;; Create num-cars of turtles if there are enough road patches for one turtle to
3 D; _) y5 d4 X0 m# a0 a- Z;; be created per road patch. Set up the plots., x2 n4 W0 P! n$ B+ n
to setup
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setup-globals( P" C. P# e: W7 Y" t
( I# n. C' U+ C: h1 v) E4 M ;; First we ask the patches to draw themselves and set up a few variables
' G3 z1 d j9 u; m3 l setup-patches4 g& [" p& L" d8 m
make-current one-of intersections
% U! s. i: S! h& x label-current m6 Y! z) j1 Y) T5 u
) v/ \: v$ J( x; d set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of ". M) c0 M0 D! c4 v
"road. Either increase the amount of roads "3 ^) I: |$ ?, [
"by increasing the GRID-SIZE-X or "
4 B% T: P, i/ T7 F5 ] "GRID-SIZE-Y sliders, or decrease the "$ {2 p+ e+ G' o* ~+ k# e+ l
"number of cars by lowering the NUMBER slider.\n"0 W! U2 p6 b4 ]
"The setup has stopped.")5 s6 u, v$ O f9 q
stop
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: _9 Z$ R% r g( g ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& }7 H6 a3 G2 ]
crt num-cars
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# Q, G2 ]; v# S C+ `9 D setup-cars
2 }1 f. I9 k, Q4 \2 q set-car-color
/ H' Y8 q0 O$ O$ D- n. r1 m6 ^ record-data
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* m3 N6 d% A7 w0 j* o ;; give the turtles an initial speed
- L2 \" V* v7 Y/ ` J# A% p8 |6 K ask turtles [ set-car-speed ]" P2 l/ x' z( r/ x9 D" V; r3 ^
0 C+ x$ H9 K, L+ m+ I Q' G reset-ticks8 o& `# R q) H+ Z* s
end
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;; Initialize the global variables to appropriate values! @2 |( m8 r3 H( b
to setup-globals
2 R9 q4 y! i( V& B; ]1 \2 j set current-light nobody ;; just for now, since there are no lights yet9 I! Q. H1 X z3 h$ H5 K0 ^
set phase 0
" }% P' J+ s+ [) r8 D' _' O2 g; F: ^ set num-cars-stopped 0& [# i- Z6 E% a( O2 c; u, e
set grid-x-inc world-width / grid-size-x/ c3 Y' l: V2 D3 Y; ]5 p
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
8 y( I( _. z6 a5 E6 A0 ] set acceleration 0.099
$ g# k l! L9 U7 b i0 o: fend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
4 B5 h' t+ W/ w! s/ S& H;; and initialize the traffic lights to one setting9 D( ?( `$ n& W
to setup-patches
2 f6 ~1 { F: @3 C& L4 p ;; initialize the patch-owned variables and color the patches to a base-color( u, m8 f0 |$ _' b& a
ask patches7 M1 l& H) L5 \% B1 g
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set intersection? false$ C7 C+ x4 o* K
set auto? false
. x; {6 f# u7 \0 P C# h6 u0 _ set green-light-up? true
. a H$ z* f+ d7 a0 S set my-row -1
% ?9 H# a6 U0 H- M) A( ?/ Q m9 s5 w set my-column -1
) Y* e9 v0 V% \3 `. d3 x1 r set my-phase -1
1 ~% U4 n- D) i4 r/ H9 G+ r3 @ set pcolor brown + 3' H+ M6 U7 m6 f& h" L1 ^
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0 p+ E4 }% B( Q1 E; l2 u. ^* K6 O4 N ;; initialize the global variables that hold patch agentsets
5 w6 ^% L1 q9 R# Q0 ~ set roads patches with
' b9 o6 }1 D8 W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' H* k) c4 O% [5 k2 c
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: H p7 n4 @- r' _ set intersections roads with. [8 h" w% ^$ t$ u: @4 U7 H& v
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) F8 P* l) g; A& x4 P! ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)], D8 e. ~9 x1 ?& {
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ask roads [ set pcolor white ]% C3 h+ B j$ q9 j9 N2 a6 \" m7 U
setup-intersections& \( J) G: v C3 D5 Z
end
! P5 x) O: _7 e/ c2 A, R1 w5 w其中定义道路的句子,如下所示,是什么意思啊?2 I% L; o. [1 A6 D! ]
set roads patches with* E% k. u. R9 I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" m" M. F6 T7 @/ J$ F/ G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! _: m( F: k" R9 c- M6 L3 m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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