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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。
5 T5 ~! S& s* E9 l$ q: [ e& t# u2 Unetlogo自带的social science--traffic grid这一例子当中,. J+ v S2 U4 H' ~* e* k! |* w: T
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
3 M9 C- n3 e" d% Q' b+ c grid-y-inc ;; the amount of patches in between two roads in the y direction
" `7 t2 z5 _2 F; ^3 K acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 a7 b4 @+ o9 g) E" Q5 o: F ;; it is to accelerate or decelerate* q) x3 v8 J' g/ H |0 B. `9 N
phase ;; keeps track of the phase
# J" Q2 R1 F! I0 H1 R num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) g) K9 ]2 g! C, ?! H+ m current-light ;; the currently selected light/ m) G0 h. i; ~* Q& R) V6 k% C
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;; patch agentsets
) t- i5 j3 g# b8 u! X+ a7 d intersections ;; agentset containing the patches that are intersections
% g# N7 s$ g' _: O1 B roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle! E; y0 J* S8 S2 a
up-car? ;; true if the turtle moves downwards and false if it moves to the right
& }1 u* [2 U* n wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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5 V$ H. O. m, f6 j( b intersection? ;; true if the patch is at the intersection of two roads
8 ]- q* r4 o& f7 r' z% }) h green-light-up? ;; true if the green light is above the intersection. otherwise, false.& q7 m# p, K( [& O5 ?; F
;; false for a non-intersection patches.: ^% m4 Y$ I2 Q5 K% f0 N9 ~: ^
my-row ;; the row of the intersection counting from the upper left corner of the' _( g4 y% T! `3 w+ W
;; world. -1 for non-intersection patches.
& E( |4 R1 R: ~2 l! z, d/ L: ^) K my-column ;; the column of the intersection counting from the upper left corner of the
# _7 T2 ^+ L) J ;; world. -1 for non-intersection patches.$ }3 \& x8 J# m
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
& x# S k6 E. k3 `5 y7 W( c auto? ;; whether or not this intersection will switch automatically.6 I: Z! O7 S5 M$ c, n% P
;; false for non-intersection patches.8 J- K V Y: D6 m4 z5 z J6 D' ~
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" e/ G6 L& a/ y; ^7 e, R;;;;;;;;;;;;;;;;;;;;;;
1 n: ^% R1 e6 t6 j" a;; Setup Procedures ;;
4 J/ q/ \' m. d;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
) y) p9 U6 c! Y8 g' e# t;; Create num-cars of turtles if there are enough road patches for one turtle to! O. Q% h$ v0 c2 j
;; be created per road patch. Set up the plots.2 `: q n# w' M, k! ^
to setup" Z: y0 l' i# e$ L8 P* j3 t" ]/ }
ca
7 O: T* q% A5 ] O: L setup-globals
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8 m# P y* X! Q# ~" r+ \ s ;; First we ask the patches to draw themselves and set up a few variables4 |$ ^# L( B0 m! k* {" J+ E0 G. G
setup-patches. `% R' }$ h4 c9 M& {$ k2 j7 {
make-current one-of intersections
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) X% ?9 Z5 ~) E8 Q0 l5 i! s4 }9 N set-default-shape turtles "car"
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! W6 C8 i/ N2 a4 B. J if (num-cars > count roads)& U) k o8 Q+ B6 [
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user-message (word "There are too many cars for the amount of "
; P& Z& M! _0 _0 j "road. Either increase the amount of roads "
% p p" C) h' k# R, C& H, B "by increasing the GRID-SIZE-X or "
, |: P O% f0 |+ w "GRID-SIZE-Y sliders, or decrease the "
! W2 _' d; f8 I8 J5 _) U "number of cars by lowering the NUMBER slider.\n"
$ L5 {; [# L6 g$ k! _ "The setup has stopped.")1 K6 n/ S c# m
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" h3 ]' S( d6 K& ?' ^3 E+ P. |
crt num-cars9 W6 E5 t! c. J- b" D* u
[
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set-car-color
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;; give the turtles an initial speed4 }9 l: w1 e' ~' |2 J+ W
ask turtles [ set-car-speed ]
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end4 L+ c/ l4 x: c
6 H7 ?% f) W0 @9 i) X4 A2 I4 O' R;; Initialize the global variables to appropriate values
% A s2 w( [/ }2 W+ a) z1 Y, Fto setup-globals
7 Y9 |9 |$ ?3 }9 t. T' T2 r set current-light nobody ;; just for now, since there are no lights yet: c8 v' Y E; f' o0 m% O8 o
set phase 0* X" L+ W4 `$ w& F, K, ^
set num-cars-stopped 0
( b; a5 u& A, ^/ a7 k9 Q. l set grid-x-inc world-width / grid-size-x- H2 Q" n' V" e* I% e
set grid-y-inc world-height / grid-size-y
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9 \, M2 i4 P4 W# z5 b( E ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary0 Q4 S2 v- `: Y: R+ v
set acceleration 0.099
c' q C. \% g' h+ @end
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# }5 ]+ C4 F+ M, |) T* j& b;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, r, U* @+ F6 r1 x# C+ ~
;; and initialize the traffic lights to one setting4 _! f* w' R4 q& c% x0 j o) Z! U
to setup-patches( X/ V( D/ o. l, R) ]8 f
;; initialize the patch-owned variables and color the patches to a base-color1 T, [. [# _& }6 I: M
ask patches# [8 w' \( V& A+ z: s- ^
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set intersection? false1 A ^( J: p, Z% i/ w" I# u
set auto? false
% r- t- v3 L# x/ j set green-light-up? true( R8 N, E8 S( R5 k9 k
set my-row -10 _2 l3 `. e4 O! r2 Y% C0 H
set my-column -1& c+ G$ C' v3 j; N7 l9 |
set my-phase -1% R% a0 n: c8 Y: Z
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
6 h& P; Q8 r5 q$ d set roads patches with" u" \+ h' ]6 d, m. R) c7 c2 O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) P/ e! j% Q f7 m8 B" Y4 ~ (floor((pycor + max-pycor) mod grid-y-inc) = 0)], q+ A( P* S1 z; H+ i6 b
set intersections roads with
6 q) T% d2 l3 ?) Q* V2 h2 ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
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0 _9 F" n U6 L; A ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?, v% u1 [6 G6 \4 S+ I! `# L6 F4 z
set roads patches with. w% k7 @5 O( b4 r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& n3 m, @; P3 _) { (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 H: K3 N4 d2 b( K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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