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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。
% C8 w6 x. e9 m4 G) H% r' e4 Inetlogo自带的social science--traffic grid这一例子当中,& ]3 k' d% m5 ]; c3 T
globals' _" c5 X' ~4 @; C; n: J8 C+ V
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grid-x-inc ;; the amount of patches in between two roads in the x direction# j) t7 c3 \- ^4 v( _$ u
grid-y-inc ;; the amount of patches in between two roads in the y direction
) `' j* f' c- ~% u# g) J% U% H acceleration ;; the constant that controls how much a car speeds up or slows down by if
% ]( @* W& V* G+ D) ?+ \+ ^ ;; it is to accelerate or decelerate
5 w" n0 s$ R |) q* L5 u phase ;; keeps track of the phase2 d& d: W! g: ]5 w" h
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure, W# R7 j* \ b# J- I
current-light ;; the currently selected light
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8 ?0 \! m! p4 r/ s: R ;; patch agentsets
) K. m# t9 h! Q7 U" \; x# H' N1 U intersections ;; agentset containing the patches that are intersections4 _4 u1 H H/ T3 v j5 W
roads ;; agentset containing the patches that are roads
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+ n, ?6 h# d" S0 [5 u6 X- Jturtles-own
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& m: p4 F. s4 U4 }% g- S; p speed ;; the speed of the turtle. |- f* c2 D: \+ n# |
up-car? ;; true if the turtle moves downwards and false if it moves to the right! j( c, b! i+ W' ]
wait-time ;; the amount of time since the last time a turtle has moved6 i9 p$ B; i8 u! }, v' u
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patches-own4 u9 ]6 K$ [% s
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intersection? ;; true if the patch is at the intersection of two roads+ k6 @# s. L+ v' m
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
4 M/ g9 b2 m- m" F7 O/ \ ;; false for a non-intersection patches.
/ O8 u; E- i- J- j2 X b( C my-row ;; the row of the intersection counting from the upper left corner of the
* i5 W% I' G; k8 W; }8 Q ;; world. -1 for non-intersection patches.
: X& z3 {( W5 B3 J7 S) a my-column ;; the column of the intersection counting from the upper left corner of the
2 W6 X1 I, M: s ;; world. -1 for non-intersection patches.
! l# C$ [. S8 L4 g) b' u1 X) E+ v- K0 X my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: E( y- P. C1 ~4 d6 F% m auto? ;; whether or not this intersection will switch automatically.% R0 f! q- g! f, {; O! ?0 y
;; false for non-intersection patches.
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) ?$ A9 j5 `$ \. ];;;;;;;;;;;;;;;;;;;;;;
) c; e( b; w8 y7 ];; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
& _) n; }: A+ t" w) Y4 h# J8 w;; Create num-cars of turtles if there are enough road patches for one turtle to
; R& |% Y6 b% J ?1 D% N;; be created per road patch. Set up the plots.- Y' f3 @1 F3 ~
to setup
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setup-globals
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9 i# N+ v8 Y( t3 I" m) S ;; First we ask the patches to draw themselves and set up a few variables2 K% m7 C% Y8 e3 U
setup-patches; s' ]- \4 _3 @8 ^0 @! m
make-current one-of intersections
/ V/ o- H8 X4 m' x+ I& o9 S) {$ ? label-current5 _+ t2 B) D: m9 N; p$ b
! C* g. y! O" P$ c [. _ set-default-shape turtles "car"
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if (num-cars > count roads): I: Q8 C6 s2 p, Y: E: d5 j
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user-message (word "There are too many cars for the amount of "
k9 }. [2 L- M& d+ g; p "road. Either increase the amount of roads "+ u/ T$ V) y6 C G% P
"by increasing the GRID-SIZE-X or "
2 C' p3 P5 [- y. _ "GRID-SIZE-Y sliders, or decrease the "
7 A$ r0 _; O4 m3 i0 V: H# O f "number of cars by lowering the NUMBER slider.\n") W+ {3 |# z! y4 F+ {
"The setup has stopped.")/ C$ m. m2 o" Y6 m# H, @5 \
stop! o, \+ v+ L2 l/ z& J
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, m% z% f( `( D; b, b ]1 ]0 Y ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
# f+ e! d% I9 o. a% h- h crt num-cars
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setup-cars
3 k5 U" r% h7 ^& ^# q/ d set-car-color
1 f h, E h d2 ]" h' d" g record-data, B- S3 ` W$ N5 y& H% S
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$ y* e1 I; \. F' r( L# u6 n e ;; give the turtles an initial speed
$ |$ b8 ?. Q! K% x; U ask turtles [ set-car-speed ]! R: ~3 t" ?1 M# q' ?
0 G" o0 C6 I: D) R! v' ~ b reset-ticks
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$ T6 N# |+ B2 q; n;; Initialize the global variables to appropriate values
w- W- C3 A( a) o* w9 D8 ?to setup-globals
: Z% C- ^5 v5 l& S set current-light nobody ;; just for now, since there are no lights yet
2 b# j! N$ t* S% p9 {6 }/ ~) E6 B set phase 0
# t# C6 n+ v: @5 r set num-cars-stopped 0
; l% t( Z) u& Z: v" Q set grid-x-inc world-width / grid-size-x* O8 ~2 _- \" L
set grid-y-inc world-height / grid-size-y
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0 j# h2 P- f9 v6 w' X9 z( N, q! E ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ ?0 d' a- K6 {! f2 L P( T2 _ set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ x Q, `# V, |5 F2 s; y;; and initialize the traffic lights to one setting
: V' c$ u% ]; S! R3 v$ [0 {8 e f: X7 gto setup-patches
9 {) F+ }( n0 X+ h ;; initialize the patch-owned variables and color the patches to a base-color3 ~1 u4 i2 \( R0 O3 Z
ask patches. g ]8 }8 V6 A" j) V$ F8 A
[
9 `. R' ]. O9 K/ b set intersection? false
. _2 @$ V' }' f5 l" }) r set auto? false$ V. |# b4 ^! {- X. s
set green-light-up? true
7 h8 K% W2 X" I) d0 x4 q set my-row -1
0 ` D* ~5 P$ X8 `1 ]& R0 d) p+ n set my-column -1 m7 x- L, j# M9 p
set my-phase -1! ^5 y4 A0 Q$ I! G7 G ]4 g
set pcolor brown + 3
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- H6 h ]: J! q: l2 n ;; initialize the global variables that hold patch agentsets
; m: W# m0 m# B( d set roads patches with
2 x+ Q6 U3 s; g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- L% I! t: }" O3 ]0 Q5 L
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% Q5 i( V4 M3 h; x4 d$ L$ }
set intersections roads with
& @+ V \ j/ r+ h: v0 ] [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ s* B! E0 X/ t5 ?
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" W; J1 R3 W, P8 w
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ask roads [ set pcolor white ]( p9 O2 f# M" \
setup-intersections
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# [6 H$ c/ R& D6 w/ q7 a其中定义道路的句子,如下所示,是什么意思啊?
1 u$ g+ o8 [9 L6 _* I" F' B/ p set roads patches with
4 j+ D& a% N/ l; d m/ p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ `$ U! J5 P8 X$ h (floor((pycor + max-pycor) mod grid-y-inc) = 0)] C! t6 n6 U5 u# W9 l( D
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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