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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。
8 E3 L( ~+ D, L$ Z: Znetlogo自带的social science--traffic grid这一例子当中,5 P8 w1 s3 @* k
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
* U4 m" C4 A" G6 i+ U) q grid-y-inc ;; the amount of patches in between two roads in the y direction
5 w" ?5 Z& D* Y5 m acceleration ;; the constant that controls how much a car speeds up or slows down by if# }' m5 ^' F" j, b2 x' S. O) a
;; it is to accelerate or decelerate% _6 X5 ~* K# f8 J) C( Y& d5 D
phase ;; keeps track of the phase# X( W p* v- T% E
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
_9 l9 }) |0 V! D current-light ;; the currently selected light5 f2 g9 s; _0 ?7 C) V
+ {6 |; W/ |! `5 N, T- ` ;; patch agentsets
* S' E, N6 V+ I% N intersections ;; agentset containing the patches that are intersections
; `8 l8 \. R: @5 u roads ;; agentset containing the patches that are roads; Q5 d6 ] Q B: l; Z% L
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9 Q4 l) Z( c0 P0 @turtles-own$ C0 r- M# E/ A G- \# b* x+ Z
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speed ;; the speed of the turtle. E- U' p8 C8 @$ F7 k
up-car? ;; true if the turtle moves downwards and false if it moves to the right- p, V" L4 X9 D1 t9 m
wait-time ;; the amount of time since the last time a turtle has moved" j2 M+ i: y; U R p6 m' W4 Y$ K
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patches-own& L9 z8 P, k5 Y& x" |: c t
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intersection? ;; true if the patch is at the intersection of two roads
% o$ h* E6 V& _ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
/ Y/ n' ]. Q0 k& e( d- \ ;; false for a non-intersection patches." h& l: z% v3 \. v5 N3 r; ?
my-row ;; the row of the intersection counting from the upper left corner of the
5 p( L; c2 ~5 b6 F4 _7 ~ ;; world. -1 for non-intersection patches.8 t' l1 q) Z$ d* s
my-column ;; the column of the intersection counting from the upper left corner of the9 u! v2 H0 \7 o/ p" E. i* H, @
;; world. -1 for non-intersection patches.
9 F" n N' `2 E3 C+ h4 B; ?9 ~ my-phase ;; the phase for the intersection. -1 for non-intersection patches.: V! D7 ^0 w" }, [4 D* A: S
auto? ;; whether or not this intersection will switch automatically.
- H5 y" f5 |- P5 A) T% ~, T K" }5 E ;; false for non-intersection patches., s2 W8 A i0 W4 }$ w) m% j$ ~
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;;;;;;;;;;;;;;;;;;;;;;$ A9 S) ?% g: Y
;; Setup Procedures ;;; w3 W- c5 l3 \! u+ V* w
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$ X8 e: H) r! R0 Q2 _6 a;; Initialize the display by giving the global and patch variables initial values., F% y# F9 ]+ Q. c8 d7 R
;; Create num-cars of turtles if there are enough road patches for one turtle to% U }3 ~' A" S) f7 L
;; be created per road patch. Set up the plots.* _+ P( d$ n5 e. v/ x6 l
to setup: W" L& {; H0 u8 i" C: X
ca
; ]/ j" Z$ L+ J/ S x' N! d0 \ setup-globals
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;; First we ask the patches to draw themselves and set up a few variables; D; J$ z& z5 i. o, P J P: g
setup-patches
p9 v6 h3 p$ w* v, P make-current one-of intersections
! `5 h1 W- K, O; {! W) b! i label-current
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" y% ~, e$ O* v+ _- L1 V set-default-shape turtles "car"2 b. u5 o+ z ?
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if (num-cars > count roads)- c( X$ T$ N) I+ h0 R b: n
[
0 h" `3 w5 o4 F- r2 v* ~7 J- P: D user-message (word "There are too many cars for the amount of "' W) j7 n0 \. b0 S
"road. Either increase the amount of roads ") O! o' B$ m# u& u+ d) S
"by increasing the GRID-SIZE-X or "
1 `0 `% C' B, m* ?1 i: ^ "GRID-SIZE-Y sliders, or decrease the "5 q5 U8 _8 R6 B4 w! |
"number of cars by lowering the NUMBER slider.\n"/ Y) o. f% \& K7 I( ]. o9 R
"The setup has stopped.")( v8 u7 `0 u. E) l- t7 K+ k) L) S
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color- l& p) a( b+ c/ d- T. y D
crt num-cars
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setup-cars3 ]2 u! W& I, z" C# R0 ^8 J
set-car-color* T# o7 g- B2 m- f0 u6 }5 v
record-data/ C" N* R2 o1 S7 v
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% ~" L% ?4 o6 X t4 _ ;; give the turtles an initial speed
, \; F9 l4 r6 {- }3 l ask turtles [ set-car-speed ]
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8 t; [; [7 l8 h2 E. e* U6 w. S8 K reset-ticks
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;; Initialize the global variables to appropriate values
! B8 Y6 y8 O+ g9 S/ Hto setup-globals
+ ]* ^6 n6 p: {' g$ q/ `: t set current-light nobody ;; just for now, since there are no lights yet: w0 i! b. L, N* C6 r9 r8 b3 f! ~ p4 y
set phase 0
: E2 I& a" B! S9 A9 S" C set num-cars-stopped 09 |# X8 O- v4 Z
set grid-x-inc world-width / grid-size-x- ?! J. J' r% b5 h" h! K# m
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
# j+ ~) Q K1 z- \. G' N set acceleration 0.099) w: R( a- \# [( T
end
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! _! C& ~: o5 O; ^;; Make the patches have appropriate colors, set up the roads and intersections agentsets,! k9 a# L3 F4 {7 m& a+ i
;; and initialize the traffic lights to one setting9 s+ ?, s* v. X; s$ A- S3 C& v( ?
to setup-patches! V3 s7 R8 h3 U5 x/ K1 A- @
;; initialize the patch-owned variables and color the patches to a base-color
8 ?! {2 {+ |6 Z5 A& p( w. e7 h ask patches' l9 D; a4 G4 @; W8 T0 r
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6 @- S. f& ^( f5 U8 Q+ L set intersection? false
" f# k' U7 V8 Y" h5 ^* i1 I3 R set auto? false; n5 \# u5 C t2 v# Z
set green-light-up? true, i* B$ I' H* N
set my-row -1+ _& {! l7 O7 [, P( {0 P. j
set my-column -16 w2 H1 U/ U- s2 I) w/ B; p
set my-phase -1
- }2 J U) r; H- J5 ] set pcolor brown + 3" l; j% C9 Q8 u
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( g# V( E9 z, S* q. m& g5 [/ _ ;; initialize the global variables that hold patch agentsets" B! v9 C( T- b
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 B9 D6 y5 n4 [2 D/ G set intersections roads with
6 e) j$ M) l" k) a8 U [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 p% ?4 w0 o# n& i- f* C (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) o/ E1 T* ?. O+ ~; P
, r5 Y, p1 ~: E% d ask roads [ set pcolor white ]0 D8 S- h1 A% F% K y" ]- S6 {- Y& V6 {3 l
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?
! \2 A% T( y$ _5 x$ P3 D set roads patches with
8 v! y% ^" |2 q% {, e [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# n/ E f/ c. a) O, x4 Y4 S0 q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 t. Z) h% O9 T" {( r# H r7 X8 x
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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