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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。" F2 a* N* f0 E3 x
netlogo自带的social science--traffic grid这一例子当中,; @' }* G- T1 u) T1 T) z- k( Q
globals+ J9 y" R1 s# D1 y
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grid-x-inc ;; the amount of patches in between two roads in the x direction
! s, X0 g. X( Q; J7 Y# @% m grid-y-inc ;; the amount of patches in between two roads in the y direction
; S1 q% J1 A/ z, `! } acceleration ;; the constant that controls how much a car speeds up or slows down by if
# p2 o2 j" Z$ M- k g' U/ R ;; it is to accelerate or decelerate% _4 D2 P1 a1 ]% U( \
phase ;; keeps track of the phase
# o! B6 g: l1 ] s3 W num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
1 K( o0 _% ^( u6 O' W current-light ;; the currently selected light
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b8 x' A8 C8 j, y ;; patch agentsets, t9 Y- Y2 u1 @+ Y6 P ^! K) Q
intersections ;; agentset containing the patches that are intersections8 [, M" v0 Y# \; h* E& E# M
roads ;; agentset containing the patches that are roads; ?3 ?/ A; S1 y
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turtles-own' Z* H% y& u( N( w4 N# o# V
[
+ B' j O' _$ d a speed ;; the speed of the turtle
* [9 N, d6 `! N9 v/ U! R up-car? ;; true if the turtle moves downwards and false if it moves to the right
% X' E9 {7 h9 Y ` wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
; I# l! w: I* w, r4 V0 K green-light-up? ;; true if the green light is above the intersection. otherwise, false. j O' w, i d+ V) Z: I/ u
;; false for a non-intersection patches.$ ?6 e: |1 U! u8 L0 y7 e C. [- L
my-row ;; the row of the intersection counting from the upper left corner of the( p5 g% V9 e4 M+ ]' e
;; world. -1 for non-intersection patches.
. g/ b4 F8 E8 c* [; w- d! M4 k& I my-column ;; the column of the intersection counting from the upper left corner of the
) Q9 _% i6 w+ Q7 C' Y m9 E ;; world. -1 for non-intersection patches.' t3 x9 o m+ ]+ \9 w2 e
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. M$ K/ t# _. q+ O* S auto? ;; whether or not this intersection will switch automatically.3 i0 l7 V. h. A' h
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;1 o0 ]0 f% N. p+ _" N# z
;; Setup Procedures ;;/ m/ _) M1 _9 u: G$ G
;;;;;;;;;;;;;;;;;;;;;; B6 ]: s6 g2 H$ O( o
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;; Initialize the display by giving the global and patch variables initial values./ n1 H# T% P q7 k( |; ~
;; Create num-cars of turtles if there are enough road patches for one turtle to* ~ c" C! o2 D7 |* X) [ p; y
;; be created per road patch. Set up the plots.
( }6 f6 r, t8 W" c$ Jto setup
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setup-globals
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0 |# [5 `! Q6 m3 O) | ;; First we ask the patches to draw themselves and set up a few variables
5 n" j* T1 [. h1 y% n setup-patches
! N$ C3 B7 ~* M/ w+ n- D$ h& b0 ? make-current one-of intersections
5 W7 k' h3 x0 k) |& X! \. g" h; r4 } label-current9 @6 q; n, g, w0 C1 G
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set-default-shape turtles "car"7 \# ]( E+ Y! x- ?6 M* }
" B' F* N5 p! {. q7 f if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
1 T' i' r; l& y; F, e- R" p "road. Either increase the amount of roads "& {- R" I; }6 k' v9 X$ u. O
"by increasing the GRID-SIZE-X or "
4 x6 X! g y8 o" g- T; v "GRID-SIZE-Y sliders, or decrease the "3 w4 j, H, Z4 i# K
"number of cars by lowering the NUMBER slider.\n"
( \, G y- ~- i, W$ y- m7 ~- ~ "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ x h W) e2 k! {1 B: m- M* U
crt num-cars
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& m/ n; r3 D; d1 C! `; u setup-cars- ~, S. i: F* ]" m! w6 m* ^
set-car-color
* j4 J8 f8 w: I" Z1 d record-data
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;; give the turtles an initial speed3 f7 f& K# g( [" b Y3 W$ x* p6 O
ask turtles [ set-car-speed ]9 J$ `6 ]0 l1 E8 g O2 M) ~
9 q6 s, ?/ Q/ P, P$ i+ k reset-ticks
9 b/ G2 k6 }" ~! M% P* r3 xend
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# M8 r d K( Z/ [# l;; Initialize the global variables to appropriate values& M, h; i. ]$ d# d+ P8 |
to setup-globals
* T) _( h" }) T$ _3 j2 D, ] set current-light nobody ;; just for now, since there are no lights yet
/ {7 U* P; h2 E6 a* Q8 } set phase 0( w' n8 ]' l F+ e" q
set num-cars-stopped 0, c+ t/ U2 u" }8 [, N! b) Q
set grid-x-inc world-width / grid-size-x( O& w6 `: L: V, }7 a
set grid-y-inc world-height / grid-size-y2 g, e9 u/ v# @9 f4 @/ k) v
+ w1 O& `1 l- [) k# u ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 ^* p7 X" r3 a6 @ set acceleration 0.099
. s2 u$ E+ g; s' c e+ i6 @" U$ Yend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# e' h- }' k$ d5 k B
;; and initialize the traffic lights to one setting2 H; K7 K$ v4 h0 Q7 ]
to setup-patches
$ `4 T$ I6 f% e4 O% k ;; initialize the patch-owned variables and color the patches to a base-color
' m: d) b; y+ F/ P6 P8 h ask patches
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set intersection? false& j3 i4 E+ Y& U, p
set auto? false
8 z6 a# G" s' P T' W! f$ B set green-light-up? true) D) l% E c' R( P7 o/ W- x! N
set my-row -1
) o% F, @6 F: r- o$ ?8 m set my-column -1
' K6 O! ]* L7 Q set my-phase -1
& h" j5 _( N- @9 O set pcolor brown + 3
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% U$ M( J& ]$ Z" G" X ;; initialize the global variables that hold patch agentsets
0 `1 {& u% ?, y) F; Y+ g set roads patches with
$ ^# ]; B+ n6 Q9 Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ s( I1 }9 }; x" b* b2 u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& U f6 D" y' I
set intersections roads with% `( ~) H: M: ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 j! m3 M! r; k, w) j/ T0 x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) T. L" \+ f3 Y/ O2 ~! w% U
% f8 g( G" {( C$ q( y) R- l' T ask roads [ set pcolor white ]
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0 z2 ?& e {, J( {/ D) T2 |end
. T% @$ r' Y: H9 c其中定义道路的句子,如下所示,是什么意思啊?
, k7 \- ?4 M9 H3 [1 N set roads patches with
, V( M5 N! V" \$ M8 a& g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* m7 W/ d" i3 _2 n% B1 K) C" c8 e (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 F0 D S9 P2 V; ^2 ]' 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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