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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。
T; O/ W. O/ P' ]6 I/ K; gnetlogo自带的social science--traffic grid这一例子当中,2 z* ?6 [# q+ g' _: o; b
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grid-x-inc ;; the amount of patches in between two roads in the x direction
& g Y( T9 b& a3 e' \* l+ l grid-y-inc ;; the amount of patches in between two roads in the y direction0 O9 y- e5 ?9 ?; m* S+ O- L
acceleration ;; the constant that controls how much a car speeds up or slows down by if
v! [ a' S$ y& e8 V) ^1 a4 k* O ;; it is to accelerate or decelerate; A t8 }. K. @4 R" M
phase ;; keeps track of the phase
5 X+ H+ c# D8 |3 I num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure2 n+ |4 f+ S. P0 _2 p1 w
current-light ;; the currently selected light
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;; patch agentsets. m6 |+ ?7 }1 G& e) \4 N% j) p D
intersections ;; agentset containing the patches that are intersections
; e+ x7 E. Y; E5 U" A% j roads ;; agentset containing the patches that are roads" B& K/ T" [! q8 I! H1 e
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turtles-own, ^' ?3 X% f9 I
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speed ;; the speed of the turtle3 p3 ^% i1 r( O8 r6 w+ M# e
up-car? ;; true if the turtle moves downwards and false if it moves to the right
1 x) @$ H5 r- J0 F& L% @2 E wait-time ;; the amount of time since the last time a turtle has moved
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1 p6 W1 B; j. R8 [: [$ y7 X" Spatches-own
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* I8 N0 Y9 b0 O4 ]8 [& n intersection? ;; true if the patch is at the intersection of two roads
0 E; [( n A8 L/ d green-light-up? ;; true if the green light is above the intersection. otherwise, false.5 Q7 b1 @- \$ c
;; false for a non-intersection patches.; y; B! q5 d; P$ p9 \
my-row ;; the row of the intersection counting from the upper left corner of the) |. k0 l) b2 p: ~
;; world. -1 for non-intersection patches.* a q; y& g* ^4 n
my-column ;; the column of the intersection counting from the upper left corner of the
+ V7 c0 R9 u" X, W4 U+ C ;; world. -1 for non-intersection patches.
% {! a5 w |. E8 G' f& u my-phase ;; the phase for the intersection. -1 for non-intersection patches.
# c4 z0 W- C. { auto? ;; whether or not this intersection will switch automatically." D, }1 ]/ W$ W1 ?: n3 I
;; false for non-intersection patches.1 m# i8 r4 F" |7 m
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;;;;;;;;;;;;;;;;;;;;;;2 @( U3 j9 ]# m$ B5 ?/ }, r
;; Setup Procedures ;;3 z% ^( T, x6 h
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
+ l; Z) D7 e; U& _# D' e;; Create num-cars of turtles if there are enough road patches for one turtle to+ f: s9 O. _( z0 V0 e
;; be created per road patch. Set up the plots.
3 X7 Q- r4 i0 D8 }to setup# N8 T5 C" [- ]+ o, @
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setup-globals
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5 O1 L% w7 p, r( m ;; First we ask the patches to draw themselves and set up a few variables
$ L8 S, D; @& Z/ J% } setup-patches
5 \5 o9 _' Z) n4 G, q# @. H" ~ make-current one-of intersections
6 B3 `: G1 t" X1 u label-current, k! V/ p! M! F+ e5 F' k2 f
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set-default-shape turtles "car"
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if (num-cars > count roads)" s- g. b( ~ ^5 U( x7 J
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user-message (word "There are too many cars for the amount of "
- B5 u& z5 _! k0 j" Q3 [" ? "road. Either increase the amount of roads "
) D+ q& K6 k, m( J) Q( ? "by increasing the GRID-SIZE-X or "
1 \! a8 S& A7 k u# i2 b "GRID-SIZE-Y sliders, or decrease the "2 E. }4 b+ \* q" { D J3 p; ~' C
"number of cars by lowering the NUMBER slider.\n"# P; Y# V# S+ C l- q! U6 y+ ?7 s
"The setup has stopped.")+ }4 l+ S$ I2 i4 X0 `
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% n6 W" l- v) ]$ E
crt num-cars
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+ x' [& t+ i7 K& m; Q# {! y; W H" ? setup-cars
& g7 I2 k) p* Z8 `2 p! U set-car-color
5 d& h% M8 J1 J" d8 V+ D3 C& u record-data- X0 C( I/ X# n0 H) ^
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' ~7 ^$ f3 P% V2 T ;; give the turtles an initial speed+ x4 L& ^! ?7 q& z O7 ?/ q
ask turtles [ set-car-speed ]
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reset-ticks4 L. j4 K6 a% w7 i' c$ ^0 S9 Y
end- R+ e; a2 D( S& M# ?
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;; Initialize the global variables to appropriate values
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3 l2 |9 L* D' W: v- L" I set current-light nobody ;; just for now, since there are no lights yet
; G) i4 z, U: n5 B6 ?6 ?$ L set phase 02 n9 E' x0 ^0 B4 J# H% `
set num-cars-stopped 0/ A3 ~' P8 W% o9 N% V8 ?
set grid-x-inc world-width / grid-size-x
" m( Z, o s' e- W set grid-y-inc world-height / grid-size-y' h, o( {& V7 k& \) y" W3 j
0 {9 I, f3 |2 Q) B X2 D6 A ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ y5 U+ w3 _5 b4 ^5 T9 U4 o: m set acceleration 0.099, ~3 F. r9 S* j# ?& c0 v7 y
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
M* K. S2 Y1 x7 T" [;; and initialize the traffic lights to one setting; q9 U0 y4 X7 q3 o
to setup-patches
( L! ? p" Y1 N) q, l$ m* A$ K ;; initialize the patch-owned variables and color the patches to a base-color
* I; m3 J- P$ P* V6 ] ask patches# N6 J# I, a0 A o5 O/ a
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set intersection? false
. }6 H8 P" g; X" F; n set auto? false0 c9 e8 p9 ]+ F
set green-light-up? true
- n7 S0 o# H& | set my-row -1
+ f/ k$ J. k; \" }$ f4 r4 _- p+ ` set my-column -1( I3 h6 F: [* O8 ?2 ?4 e3 `
set my-phase -1
4 O' o8 A$ Y3 j. p h set pcolor brown + 3
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) {( F% Q# n1 ^/ V ;; initialize the global variables that hold patch agentsets0 f% N3 m1 W4 q+ ]
set roads patches with
j0 a, f" y. T6 M" w& _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 P: @! j$ B5 K ? (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. _7 x, Z# | A. y
set intersections roads with
6 B: Z. |+ I1 K' J+ J5 e [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; C+ ]+ Q+ v7 N7 b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 `& b' S# T1 D- }! y: v6 J
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ask roads [ set pcolor white ]2 |6 g0 F1 _# F3 C$ m" C2 F
setup-intersections' J( ^! q* Z$ V" j g/ g
end8 b# A: A- U; ~: }' f/ B
其中定义道路的句子,如下所示,是什么意思啊?" ^2 d6 d! x, G3 H9 l3 c
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 D/ \3 E; f3 V" t0 x) b, I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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