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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。
5 g( Y1 ]* H$ P# bnetlogo自带的social science--traffic grid这一例子当中,
5 q$ z3 [; F# @- D% Lglobals
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" @9 y- S B1 E3 K$ V( I grid-x-inc ;; the amount of patches in between two roads in the x direction
$ U' \. ?2 i, n4 Y% [7 `- P* b grid-y-inc ;; the amount of patches in between two roads in the y direction* I0 U3 R: R J8 S! N/ W3 z
acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 C1 Q5 t: D! L* X2 A. U0 Y. ^ ;; it is to accelerate or decelerate
' J8 A* J; o6 K0 w3 `5 F phase ;; keeps track of the phase
6 p3 ~ k, a0 \' @+ S5 \7 |* q- C' j num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure0 F- f0 h% m8 w4 A2 ~$ i6 Q+ O. a
current-light ;; the currently selected light* u1 [. a0 r8 }" |+ d0 ~6 x
; @/ `" z" @ N* @, U ;; patch agentsets& T$ n& X3 _ [) d9 O( C, {
intersections ;; agentset containing the patches that are intersections
r$ P& I5 z% j! `* C roads ;; agentset containing the patches that are roads
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turtles-own( e+ m3 g. p/ F2 t0 t
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speed ;; the speed of the turtle
' ^" h% h H1 S& [1 z* @ up-car? ;; true if the turtle moves downwards and false if it moves to the right
; z% ]/ M% a: x wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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$ u) R+ r7 p# y' B8 d intersection? ;; true if the patch is at the intersection of two roads, n1 A. m2 Y/ ^
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) V3 b4 \" f- i7 i& I8 ? ;; false for a non-intersection patches.
5 c) \5 g' P N3 P, M' W my-row ;; the row of the intersection counting from the upper left corner of the
# a2 t" q9 t, P- b7 n. A ;; world. -1 for non-intersection patches.
3 C4 I k; U1 ?7 V) v# C my-column ;; the column of the intersection counting from the upper left corner of the- K! J9 ?/ P, f. L& X: i0 h" O
;; world. -1 for non-intersection patches.. X3 F9 G8 Q) ?* L' Y4 x. m3 T
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 i$ O( ?7 M: v8 @ auto? ;; whether or not this intersection will switch automatically.
/ S! ]6 U' z& I* V5 ^ ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;; V& B! b! W& ^1 g7 p3 s- g
;; Setup Procedures ;;7 g' V' ~" H6 o* \8 J- o/ t. y7 R
;;;;;;;;;;;;;;;;;;;;;;
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# E0 g. Z/ p y% u# H+ E# j;; Initialize the display by giving the global and patch variables initial values.
4 Z. w! q& t" [6 ]+ y* \;; Create num-cars of turtles if there are enough road patches for one turtle to3 F9 M0 P& g+ ^
;; be created per road patch. Set up the plots.! z; H0 R8 A$ v+ W( S* C- A1 u3 I
to setup3 Q7 e5 j2 }; j0 c, R9 ~
ca
% c; u1 p- k6 X$ r setup-globals
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, }. t3 f/ b Y7 o7 P ;; First we ask the patches to draw themselves and set up a few variables
2 T5 w0 c5 i; k: H setup-patches$ X5 O6 G3 J0 L$ R# o
make-current one-of intersections: o* i7 I. J) z
label-current
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. r2 B4 K; F, G. \5 V: B6 h' w# f& o! a set-default-shape turtles "car"5 m+ @2 P# G& J! N
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if (num-cars > count roads)( L+ ?* O& S; p8 V
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user-message (word "There are too many cars for the amount of "
7 p' W8 ?8 L, P/ f# v1 X "road. Either increase the amount of roads "
: b; g; r2 Q9 ^/ Y( a "by increasing the GRID-SIZE-X or "
& e. X) x) M. H* p3 m1 |+ Q2 Z# a! G9 \ "GRID-SIZE-Y sliders, or decrease the "2 v- _9 e$ Y( ?' S
"number of cars by lowering the NUMBER slider.\n") ~: f5 E. u9 ]& C' z+ P, F
"The setup has stopped."); n9 U* k/ n% ~
stop. Q( R6 Q. w) R i, d
]
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2 f/ ^" p2 Z, L6 B, K' N" l ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 l) I! l% H |0 t7 g7 h4 |
crt num-cars3 a$ H1 w4 f! @1 r
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setup-cars4 {2 I t3 S4 d, s: j4 R: A1 O
set-car-color+ e; B" s; B, `/ }- f1 R; \" W6 J
record-data: g4 n7 u% b( D! D" d9 v
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;; give the turtles an initial speed. J( N- @6 R) n( X
ask turtles [ set-car-speed ]! Z. T5 b/ j2 m( a
0 A. T1 {; S# s0 U* l- f2 R* R3 V# m reset-ticks
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( L# ?1 P' X6 h;; Initialize the global variables to appropriate values# Y, X9 z: S; d" l! ~
to setup-globals
/ a& x- u2 i/ ~# F9 g8 M" D7 [ set current-light nobody ;; just for now, since there are no lights yet& V X, D: H; ^5 |# |
set phase 06 X$ U P1 ]. G( m+ n
set num-cars-stopped 0
* @6 r% ] U3 o. n! F8 c# m set grid-x-inc world-width / grid-size-x
L% [2 p1 v) C ]. L( E7 R set grid-y-inc world-height / grid-size-y& H* s6 v" @0 m& l8 N* j
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ U+ Q. }/ a+ \1 Q8 r% [: v# D9 S
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 A/ U4 c% s' r;; and initialize the traffic lights to one setting
; ~8 S, Z7 Z+ c6 j5 z9 V0 Nto setup-patches6 }( [$ ^- i7 i9 F; U) y/ O
;; initialize the patch-owned variables and color the patches to a base-color
, N$ a9 m2 g5 Q- k ask patches
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set intersection? false8 K! R# P2 \; p! @; o
set auto? false
: l/ [# b4 ~/ w! ? set green-light-up? true- V7 q1 d5 W+ r" M% p
set my-row -1
: R0 A! J5 A* } set my-column -1
) w r- u3 }) ~2 ^ set my-phase -1
! h& G/ p9 J) G% ]7 }* {2 a* B set pcolor brown + 36 r: K& A, T) R' t" y8 ]
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;; initialize the global variables that hold patch agentsets
& m. G7 c) c/ o4 Q6 Q set roads patches with
3 k; V8 x& q8 P [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; T: K6 C2 r1 \, ^3 l
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 ^2 Y r: ?/ ^5 a
set intersections roads with
/ J7 |/ j) F ?( m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
9 K* L) g+ ]$ a$ Z+ `% Z2 |1 l (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! Z9 K3 Z; p) d, P b, V
" O7 n; H: ]# p# E4 ~ ask roads [ set pcolor white ]! b3 S7 ~( s% a6 q* I: X/ Z/ a
setup-intersections
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) C6 _! i* I0 a% u3 K其中定义道路的句子,如下所示,是什么意思啊?; @3 T* v# h, V I' w, `! }
set roads patches with* w- q0 D, M9 s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: b1 U6 F+ F' J0 H' w (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' T. \- y3 s M8 s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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