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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。
: k& S3 }/ h# g' a; anetlogo自带的social science--traffic grid这一例子当中,
& F, M6 Q& i" b; m: kglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
% L( @ c; P# ~4 D3 | grid-y-inc ;; the amount of patches in between two roads in the y direction, q6 _& l$ C7 _5 X7 _- {
acceleration ;; the constant that controls how much a car speeds up or slows down by if
. B, O. w9 X. f5 V% P- a ;; it is to accelerate or decelerate% H! ^4 Z) ]1 ^! ?$ z5 L3 K
phase ;; keeps track of the phase/ M+ r8 J2 Z" Q9 V; L8 d) m
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ u9 {* v3 @4 t% p* l current-light ;; the currently selected light
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;; patch agentsets. _+ N7 u' Y& x3 ]$ j' k5 D+ G
intersections ;; agentset containing the patches that are intersections/ _$ R6 V& |! J* F' k5 m. G b1 Q
roads ;; agentset containing the patches that are roads
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turtles-own
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# b8 |% }& F8 L# X* @' v x4 @ speed ;; the speed of the turtle
% P+ C* V8 b* r! m up-car? ;; true if the turtle moves downwards and false if it moves to the right
3 ]) n; i* _. j4 ~* ]6 ~ wait-time ;; the amount of time since the last time a turtle has moved
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patches-own: ]1 ]) ]! [3 S
[
; ~7 P8 B/ s# J2 E# F1 z# B- a1 V. l+ Q intersection? ;; true if the patch is at the intersection of two roads
6 p3 \+ U$ d7 n# h$ X' V9 ^! \ green-light-up? ;; true if the green light is above the intersection. otherwise, false.: ?8 O; x/ f3 i7 x$ Q7 e
;; false for a non-intersection patches. A) M" B/ i5 @, V0 `
my-row ;; the row of the intersection counting from the upper left corner of the" b, U" o% Y8 c; H, H! v
;; world. -1 for non-intersection patches.
( I8 M: A7 D" l0 K6 D4 A y my-column ;; the column of the intersection counting from the upper left corner of the
! E$ W5 s! a5 y0 m% [7 R ;; world. -1 for non-intersection patches.
9 B8 e. j8 `$ ] my-phase ;; the phase for the intersection. -1 for non-intersection patches.
) d) D* q, H& T% \ auto? ;; whether or not this intersection will switch automatically.$ K1 O d$ v( o% I( Q
;; false for non-intersection patches.5 J5 c* u: ?; ~. ^) X
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;;;;;;;;;;;;;;;;;;;;;;
; w8 d! Z0 X# @1 V& U;; Setup Procedures ;;6 }0 t' _& Q1 L0 b7 f+ b0 Z
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;; Initialize the display by giving the global and patch variables initial values., t. U5 D8 f9 u9 w
;; Create num-cars of turtles if there are enough road patches for one turtle to; z- D& g: a: Y, K0 {9 x) E* l
;; be created per road patch. Set up the plots.
( M+ e% e) p4 u/ @1 Ito setup2 T+ {# ]. `1 I$ I' O: n
ca
+ C2 d4 X/ l n4 b setup-globals0 [1 A! b1 p9 }: t6 p
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;; First we ask the patches to draw themselves and set up a few variables! Z9 k# D! G: n0 m% ?: S6 U
setup-patches
3 m0 [, K; U, _5 E! T& M make-current one-of intersections, x i' [ f" f, f
label-current
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2 L! O! s' x0 Q! y set-default-shape turtles "car"# N: ]. d. W& m: K5 R0 f
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if (num-cars > count roads)
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( B ^5 i. `8 G6 Z# k6 O c( q user-message (word "There are too many cars for the amount of "' o1 X5 Z* _- @
"road. Either increase the amount of roads "" Y j7 A5 {+ S; R3 c& q3 b
"by increasing the GRID-SIZE-X or "+ E/ J7 }1 r/ o* p7 h
"GRID-SIZE-Y sliders, or decrease the "
1 f0 K3 P; K. f0 R7 T4 u "number of cars by lowering the NUMBER slider.\n"
; I y; b) U+ {% z# i/ A6 \ "The setup has stopped.")' P* t& H- X3 [' @
stop
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# N. X# q* z R9 \ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 @; [$ O; l* I) g/ m0 {% W) G
crt num-cars
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3 T, k; L( w3 `% ] setup-cars
) x, ~8 P& V$ } set-car-color4 j5 e( }; }: i& N. H, \
record-data
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;; give the turtles an initial speed
& Z; |" Z3 v( h+ g/ X. r ask turtles [ set-car-speed ]
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reset-ticks6 w/ n2 D9 N$ _: |! d
end2 j4 @0 m, } ]7 Z: @
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;; Initialize the global variables to appropriate values
2 r( s' x7 \$ h& ]to setup-globals. P. r" J4 P) G1 ]# m0 H4 x1 T
set current-light nobody ;; just for now, since there are no lights yet3 M* h" ?# z; ^ N4 s! Q$ }* c% q
set phase 0
" ~8 J. b- w' R; a set num-cars-stopped 0
; C9 l# z: }8 z9 j% } set grid-x-inc world-width / grid-size-x8 ~; h, R# b7 q0 G8 v6 d
set grid-y-inc world-height / grid-size-y) t5 c* T* @# ?
( ?* M, }: \' `( }& B# w9 L3 Q9 K- ^7 J! w ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. ^- j" Q3 ]! e D set acceleration 0.099
1 f$ H, \. S5 w9 ^9 m2 mend
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1 N; ]8 @3 a! l% F& K L! r9 Q. Z0 K- E;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: m1 t$ L" D7 O# d$ P! J6 J
;; and initialize the traffic lights to one setting
* h* D/ F; A" J1 cto setup-patches
$ j* A8 b) F0 D ;; initialize the patch-owned variables and color the patches to a base-color
# g9 T2 g2 W0 T5 }! u1 Y ask patches; R- n3 T$ D! i8 j* a
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set intersection? false
6 U+ X5 M) _, w8 I set auto? false8 |( `& L" T5 H, \1 ^% j" Y
set green-light-up? true& @) E5 p- Z* ?" K
set my-row -1( i/ |* d3 f4 c& u. W% X% B
set my-column -1' i7 Q' R- Q. m3 l0 u. X1 i
set my-phase -14 d4 o9 |+ v1 M" f& i* V4 Q2 W) T
set pcolor brown + 31 h y& `6 m5 R2 B7 m* ] I
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;; initialize the global variables that hold patch agentsets
1 H& S9 V0 z2 x3 P4 M% W+ S set roads patches with$ V# H W& g0 V' c* U+ F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* C: I" k# c9 ?# s9 Z# B (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( z( P6 k0 L* q' P J4 `+ a
set intersections roads with
. d7 b: H3 e, L* u( a$ a [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; |0 c9 p7 p+ |5 ~ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 o$ b5 l* h0 k
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ask roads [ set pcolor white ]
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8 T5 f! T: o: A5 R/ t; S* L0 x& Y, c" W其中定义道路的句子,如下所示,是什么意思啊?4 R2 m+ e3 `4 I j3 M" [
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 |0 Z. s5 m: j. V5 }4 U2 h7 F
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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