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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。/ M' _8 D/ _. [3 B+ I1 u$ [
netlogo自带的social science--traffic grid这一例子当中,+ |. X8 u1 @3 j: g
globals% g* C- K/ t8 s6 q" @5 S
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6 b8 s) [1 I$ w% i- @$ S9 |' v3 M grid-x-inc ;; the amount of patches in between two roads in the x direction
% u3 G! y# e( r% K/ @ grid-y-inc ;; the amount of patches in between two roads in the y direction4 `( I3 p1 a9 s6 B) U
acceleration ;; the constant that controls how much a car speeds up or slows down by if3 L; o/ x: D( Z; i
;; it is to accelerate or decelerate- y0 o N& H k' q2 M& `
phase ;; keeps track of the phase9 k) v1 K' l( V2 F' `$ U
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure. T* O* d/ C, }& [2 @5 v- z0 t* l. V
current-light ;; the currently selected light" v9 S0 D/ O f
& Q4 D: ?8 j4 \9 h$ t+ M7 Z ;; patch agentsets
5 i- W w9 [; y) i- {) l' O intersections ;; agentset containing the patches that are intersections
0 j1 O/ D4 |5 e& D roads ;; agentset containing the patches that are roads9 K! y" o2 O- g; G
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! `' t% z* H5 {turtles-own
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speed ;; the speed of the turtle
! m8 W: v$ \' K7 P ^/ e' t8 ~ A up-car? ;; true if the turtle moves downwards and false if it moves to the right7 p/ F9 i5 m' {
wait-time ;; the amount of time since the last time a turtle has moved4 B% H4 Z9 O9 I; o. F' R2 R! `
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8 F1 p1 d6 {) f! hpatches-own+ x& M2 {+ `! y& y3 L& o# O/ X% D
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intersection? ;; true if the patch is at the intersection of two roads2 _, `! v1 i V
green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 q/ B7 r! P3 C$ i/ a
;; false for a non-intersection patches.
) q3 g- r; g) O" ^$ u my-row ;; the row of the intersection counting from the upper left corner of the/ _7 r: l* Y/ j4 X! o: H
;; world. -1 for non-intersection patches.
$ W! P; ]0 V# E my-column ;; the column of the intersection counting from the upper left corner of the
1 ]' S4 h6 [. r& J ;; world. -1 for non-intersection patches.
: B- }4 I3 R3 s- A& S my-phase ;; the phase for the intersection. -1 for non-intersection patches.
8 {& G T' M3 U: O& x8 \0 v/ B auto? ;; whether or not this intersection will switch automatically.
6 Z: ^/ |9 G) Z+ U; i ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;0 z+ W! K- k) S+ M8 b
;; Setup Procedures ;;
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' n6 [+ t# j8 d' ~: A3 V( F) ];; Initialize the display by giving the global and patch variables initial values.
% P2 B4 c6 v& k0 {;; Create num-cars of turtles if there are enough road patches for one turtle to# f: G/ M) ~) m' r- m% E/ w
;; be created per road patch. Set up the plots.3 W& D/ t4 ?/ M0 m( e# I t
to setup
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& |4 m6 I+ h# v3 V; a8 ]% I9 I: X setup-globals5 G7 M- [. E& H
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;; First we ask the patches to draw themselves and set up a few variables
* _- k$ h* ]( L* z4 S setup-patches
/ x! K" P/ c4 @5 n5 V% ?! g make-current one-of intersections
" k- d# S: s D" w label-current% a$ _/ S- u* C1 Z# l9 v) E4 F
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set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of " E( }) ^6 L4 O0 v
"road. Either increase the amount of roads "3 y& q8 h9 m G }; y* L
"by increasing the GRID-SIZE-X or "
; \2 b# ?/ K" i2 C "GRID-SIZE-Y sliders, or decrease the "
0 o# j1 L. \: N1 | "number of cars by lowering the NUMBER slider.\n"
" r/ J3 h2 e6 ?4 ?! Z "The setup has stopped.")
+ t# I. b$ j: K* Z stop Q. j) s' \* F
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3 N+ u( r1 s, q& _ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color- x# x5 W: j- w. {! S/ _
crt num-cars" p5 s k ~9 d0 E7 g2 [( \
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) j! o" W. `% ?4 B$ I" i5 ~5 F: ] setup-cars
- x9 B+ ~% C9 {) N; ^ set-car-color4 r8 A f* p# ]% _* K# t
record-data
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# [7 s3 W7 Y f ;; give the turtles an initial speed4 c, t' _; l* k' \# Q( q7 J
ask turtles [ set-car-speed ]$ Q# V2 @" T3 G* j" Z
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reset-ticks
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9 O" C1 ^3 p* b+ w& x& X3 ^( z;; Initialize the global variables to appropriate values
5 B6 z- g/ c7 v2 Yto setup-globals
% O' c1 h* \8 }' n5 r set current-light nobody ;; just for now, since there are no lights yet) R" b0 \2 A) q8 m6 e, k: S8 Z
set phase 0
; b$ t; q4 N r/ n- K* p3 G set num-cars-stopped 0: D* c) n: Q* f2 |; w: c
set grid-x-inc world-width / grid-size-x5 K, I0 e' M# }: Q
set grid-y-inc world-height / grid-size-y
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Q; I7 i$ y5 q ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary! o* ^' O* s- O5 x* v( I
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 }9 g k# O* i$ a+ w. F( w4 t Z
;; and initialize the traffic lights to one setting
; p+ X- a# E4 r( C: T# N mto setup-patches
+ t7 a' G* e; R6 [+ ` ;; initialize the patch-owned variables and color the patches to a base-color9 j6 ?9 ^5 x3 T. P J
ask patches8 {4 |3 c$ G3 T) ?+ O) h/ F, Y# f
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set intersection? false8 |$ z6 S" H1 c- Z" o2 q- x
set auto? false
) o# S9 @, C6 e3 X set green-light-up? true
1 L; a. D1 V3 r0 }4 d set my-row -1
9 H: |; }; U- x3 n r, ] set my-column -1
6 k" @( [' p# k' e9 Y* F ]' U set my-phase -1
% A- ~. a( Y5 C' y% {: e set pcolor brown + 31 Q0 Y( Y7 W# f. J7 m4 g' u
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& I, d" H# K9 N* u; S* Y ;; initialize the global variables that hold patch agentsets
% l0 k* t) d' Y: j set roads patches with* B) M" r+ F Q0 o- L; W
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; [$ {7 n5 ^9 r. B
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 M0 r) }4 g1 i
set intersections roads with
3 t* c/ t8 c( H+ ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
% K9 [9 p) d8 x4 E (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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* _* t* K$ Y" V& m w% ?, o9 \ ask roads [ set pcolor white ]& q" k( n* x U/ k' Q7 H
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?( |4 D/ T) q( r4 n" F) O7 q9 O
set roads patches with
! L0 X, p5 T! ?7 x% \+ e, ^ Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" k: {( T( q/ t1 O1 ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 B" ` @ z2 V
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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