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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。
; a/ Q7 N9 t5 P9 f0 Enetlogo自带的social science--traffic grid这一例子当中,
- }1 b. c; `! Y! p* S5 x) ` bglobals
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; Q4 l. B# L* P2 t/ x0 V9 { grid-x-inc ;; the amount of patches in between two roads in the x direction
* V! ]% u" [+ k/ ]% ] grid-y-inc ;; the amount of patches in between two roads in the y direction
4 g j; J3 Y0 q. W acceleration ;; the constant that controls how much a car speeds up or slows down by if
% |# `/ L8 r9 B ;; it is to accelerate or decelerate
* ?2 U8 Q$ V) O, ~ phase ;; keeps track of the phase
- s$ R" R- A- V8 ^8 q num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
1 F' S- h, M E+ r8 ~ p* m current-light ;; the currently selected light y# X* V, l4 j$ c2 v
- v& W( K- Q9 I; _- T ;; patch agentsets7 @* F, m9 b& e" B! X
intersections ;; agentset containing the patches that are intersections
- L' n* L: {8 Q( p5 t1 j roads ;; agentset containing the patches that are roads
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turtles-own) K- b2 a) Q: f- B
[
4 a- X2 i, c6 f: ?- L$ I speed ;; the speed of the turtle+ ^! D8 X% U* L) r( @$ s3 [
up-car? ;; true if the turtle moves downwards and false if it moves to the right$ R( I$ i5 c0 [9 H2 x, c, m: r
wait-time ;; the amount of time since the last time a turtle has moved
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- b2 j! d3 ~& `$ Hpatches-own
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intersection? ;; true if the patch is at the intersection of two roads& q8 Q6 ^( [, y
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% R* l' a. m! J' x8 B/ x5 N. v ;; false for a non-intersection patches. j! G4 a( V- p' f3 e) J; N* B& ?
my-row ;; the row of the intersection counting from the upper left corner of the
- B/ s4 v# Y# j; D ;; world. -1 for non-intersection patches. v1 O% u% s/ @
my-column ;; the column of the intersection counting from the upper left corner of the) U4 W" ~# ]; w! W
;; world. -1 for non-intersection patches.) c9 Y3 V3 L- C& ?# {
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
8 n0 Q5 {; l2 X5 n$ m# s- O+ C auto? ;; whether or not this intersection will switch automatically.
, ]6 x3 C# g6 |0 F( r- [ h9 T ;; false for non-intersection patches.
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# d0 ~% v6 F9 ]9 l6 g8 ^4 B" X3 Y;;;;;;;;;;;;;;;;;;;;;;
5 `3 ^' w: k+ c5 O$ v# M9 L;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values. y/ d, x/ ~6 S- Z
;; Create num-cars of turtles if there are enough road patches for one turtle to
. d. V# f" q. M) z8 [( E0 w1 X;; be created per road patch. Set up the plots.8 u3 r: H* t# V" L1 b
to setup
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setup-globals! _8 s9 Q$ @" ?
7 E C# N1 O' b1 R! i( {$ ` ;; First we ask the patches to draw themselves and set up a few variables" x1 A6 L9 L5 k, X3 c
setup-patches
5 O2 G% j. \7 h3 F make-current one-of intersections
0 \5 F. H9 N* p* M. Z) G U9 D label-current
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; v U/ `3 M7 I. H set-default-shape turtles "car"
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" K! y) u. w0 D, y( Q" } if (num-cars > count roads)+ H: d3 I( b+ W
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user-message (word "There are too many cars for the amount of "
; i Q: J3 P3 O0 I "road. Either increase the amount of roads "
# l) p" o9 w9 w+ C "by increasing the GRID-SIZE-X or ": B$ Z1 b& _3 X( L g
"GRID-SIZE-Y sliders, or decrease the "
) E. C# o' ~1 i. E "number of cars by lowering the NUMBER slider.\n"3 `) A* W6 i9 A8 t3 A6 A
"The setup has stopped."): g+ J! R7 y/ p" p
stop, j/ a' ?! d1 E8 O+ Y
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' A1 Y& v+ K" H% [7 k ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 U& y6 t1 e4 x- \2 C
crt num-cars4 |1 H" w& I+ ^' a8 l5 l
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setup-cars
+ y; Q* X6 `/ e set-car-color
) U4 g5 i: z& ]$ d8 h) H2 y record-data ]" g1 Z* K" a8 p
]
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5 b Z' s* w+ O5 M N% K# p ;; give the turtles an initial speed
: G+ \$ a# I# u6 X. |3 [0 H* _ ask turtles [ set-car-speed ]3 B, B3 X( W7 q7 v
& t) a S9 D- Q7 j reset-ticks+ _2 x. ~4 X5 f* L( r4 Y
end9 \ S! y5 g4 Z1 c4 [/ Q: V
0 F6 J, U8 \0 g/ n A+ | f;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet3 n4 q4 q- y1 q% Y) s) ]: \
set phase 0! U$ o, k9 ]% I
set num-cars-stopped 0
3 @8 \* a' X) B) i) I9 s4 w set grid-x-inc world-width / grid-size-x2 j6 I; m: X3 e; ?/ \5 B
set grid-y-inc world-height / grid-size-y9 i7 r7 S) O' G c# }
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 P, @. n- J3 ^# U' e3 [9 U* x
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% x; K/ {7 ^# L; a0 D8 c3 w( I;; and initialize the traffic lights to one setting: n0 o! E# ?1 j
to setup-patches1 X3 i1 w5 x1 t3 K; a
;; initialize the patch-owned variables and color the patches to a base-color5 J3 B5 f5 E2 E% L5 {8 v5 N
ask patches/ b+ }% U7 R* n j b( ~$ I
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set intersection? false
, k- B- x- A# a8 N5 I& {; Y8 L set auto? false, O+ F8 [! R3 j! h
set green-light-up? true
# C. ~6 T7 ^3 \ N; _5 S! l( V set my-row -14 H2 O# O. J4 @; l, W, g3 p
set my-column -1- \ W5 j1 K- ?" g3 V& ^9 g
set my-phase -1
: ~+ a9 P O+ k$ v! p: l set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets/ B* d& c5 ?8 P% e5 ~. X
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]' U9 F1 ]. |& u: T$ }; D2 @' h
set intersections roads with* l) I8 T. a; l" f [+ i/ j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 l2 ?- }0 L; T o" [1 g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( R+ B. O: p* r
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ask roads [ set pcolor white ]
0 y; J- j4 v5 S/ {5 K setup-intersections1 ?( p6 }8 w" k/ V
end5 ^' {' m+ i! b/ J& k' d7 X
其中定义道路的句子,如下所示,是什么意思啊?* m" d: p* }2 ^2 l. W% m
set roads patches with
% r( f! T3 E( y3 M' |$ ? [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! P- L' W& d/ {3 x) X6 ?$ ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 A: x. s' Y# L1 M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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