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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。" J- t- j5 b" U+ a! a
netlogo自带的social science--traffic grid这一例子当中,& `/ x, T& h% G3 t
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
8 l/ s# L9 g/ E8 {' V grid-y-inc ;; the amount of patches in between two roads in the y direction3 h% Y5 n {$ B0 H2 ~0 J# T
acceleration ;; the constant that controls how much a car speeds up or slows down by if- z8 v9 w! w$ p; E5 N0 G
;; it is to accelerate or decelerate
: [) X; J3 v1 R phase ;; keeps track of the phase
4 p# G X4 c0 ?; t! i, K2 j; u num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 `1 x$ j. N, ^) E- K3 m8 t# A
current-light ;; the currently selected light: h7 W! b* ]+ J0 _4 n& j9 d3 ]
" [9 F5 x8 r. \" { ;; patch agentsets
. S/ n7 e/ M) y% F0 ^! [7 ?+ @ intersections ;; agentset containing the patches that are intersections
' C H- `5 h4 v! h) w- b2 L1 l* y9 J roads ;; agentset containing the patches that are roads @+ j, g) {" L) e/ E
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turtles-own d! X8 T3 [ e, @
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speed ;; the speed of the turtle
) Q7 C. G2 E) G) v up-car? ;; true if the turtle moves downwards and false if it moves to the right
- _3 l: r3 d7 k, j wait-time ;; the amount of time since the last time a turtle has moved
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patches-own; N; H6 x. K/ B7 w9 \5 q) P/ h
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( V0 I' t3 [5 n intersection? ;; true if the patch is at the intersection of two roads
' U v0 Q D) C! R* a. y9 b, R green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- B, k2 {" C+ m( B+ z8 c( y ;; false for a non-intersection patches.1 M7 K& L) O7 q! O+ w$ W n
my-row ;; the row of the intersection counting from the upper left corner of the, A# [2 p3 i- A' S. l: O4 R: I a$ v
;; world. -1 for non-intersection patches.6 ]6 n: B4 d. d: a5 t7 Q
my-column ;; the column of the intersection counting from the upper left corner of the
, K7 Q3 k% K) Q6 b& l5 O ;; world. -1 for non-intersection patches.
0 Z+ [; G. U( n6 B9 X9 w, B my-phase ;; the phase for the intersection. -1 for non-intersection patches.
1 H9 F& j$ c2 C, c auto? ;; whether or not this intersection will switch automatically.
7 o7 B' @1 {' G+ N5 T6 [6 u ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;1 }' q o4 }0 m5 N8 _7 E. d, E
;; Setup Procedures ;;" {. C' V( O. l/ l( c
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;; Initialize the display by giving the global and patch variables initial values.! T3 Z) L2 Y. \0 |7 X' b8 W9 \' C
;; Create num-cars of turtles if there are enough road patches for one turtle to9 k! d+ A+ a2 M6 b
;; be created per road patch. Set up the plots.
, x, q" l, I/ q# H3 _ ?' x# `( Gto setup
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* R! I" l: G1 Z. g4 { setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
* I4 k$ n, o9 H3 v setup-patches
0 @$ p( M' }+ x; }' G3 V make-current one-of intersections7 f7 ]$ d$ b1 O9 e, _, Y, m1 R
label-current
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set-default-shape turtles "car"
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c, e3 D1 a6 H6 W. H: N# R if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
& H% ^; p$ Q; U, s& j "road. Either increase the amount of roads "+ t: ]7 a" }$ K4 D+ I+ Q, P# Y
"by increasing the GRID-SIZE-X or "
+ `/ H! b% ^' k1 B/ z+ Z. u "GRID-SIZE-Y sliders, or decrease the ". a0 `0 p0 `% ~& S3 W7 X( T
"number of cars by lowering the NUMBER slider.\n"
6 H& E6 J, L6 F& \4 W/ X: m& ` "The setup has stopped.")
, Z$ @/ m/ t9 Q. ] [6 p9 C% h stop3 L0 ~7 f* D4 E: N/ U9 S9 O4 W8 N1 ]
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! ~7 o. w% V! _+ q) U ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 ~3 ~5 ^' G) m- k, _! k
crt num-cars2 m4 u$ i' U. z8 `5 Q6 c% m
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setup-cars. r" `- |# m. n7 ~- p1 ]9 L
set-car-color
& q* S; |, B; [/ l record-data
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;; give the turtles an initial speed' ?' \8 [) s) m6 H- `, k- c
ask turtles [ set-car-speed ]
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reset-ticks$ j! m/ j8 i' M2 F1 E+ Y: k
end8 s4 U- @" E! y3 b
5 l9 j. q H* \4 W' E: \5 l& c: I;; Initialize the global variables to appropriate values1 i x1 [+ ^6 w* M9 T$ e' U
to setup-globals5 l+ q3 }7 w! f; K, s9 n' @ m
set current-light nobody ;; just for now, since there are no lights yet
' t! h( D8 L% ?8 k8 K set phase 0
$ {* B8 _( _) `7 ]( ] ?, Y' A set num-cars-stopped 06 Q( R! N& J% H/ J a
set grid-x-inc world-width / grid-size-x3 w" Y M0 [. _3 ~# A" j
set grid-y-inc world-height / grid-size-y
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7 s2 w7 |( Q6 x% v ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ B% `) q$ A5 p5 r, ]& p5 i9 r
set acceleration 0.099
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; K8 ^4 q& F+ X0 ^4 A;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; d! b4 J+ F8 D5 M7 y
;; and initialize the traffic lights to one setting
: S( w/ E. c" V! J9 Mto setup-patches
% Z" s4 q S9 Q/ o5 j& { ;; initialize the patch-owned variables and color the patches to a base-color* N. O( M6 F+ ?& {# O. e1 T6 S9 ^
ask patches) n5 s$ j2 G7 j# L1 E9 u
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: m. B- D! u, ^, P set intersection? false
# m# W% i' z2 j" H ` set auto? false# d( u5 n( h7 B
set green-light-up? true4 j- D5 P/ ~( J/ K, F
set my-row -15 V: r# Z, }4 v% ^ E9 t9 d7 S
set my-column -1
2 K) N: Y" v6 E set my-phase -1; e3 G2 Z: O: g2 J' d
set pcolor brown + 3/ n0 A3 G* [8 z$ }0 J+ H7 ~
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9 g6 r1 r! H( b ;; initialize the global variables that hold patch agentsets. e% i# E Z& O. H
set roads patches with8 _7 t6 R5 [: |1 U
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. n& E: d( q' x8 p7 O+ s* y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 J7 j! k, s: [0 {% h3 u, C
set intersections roads with4 q3 _% `8 K( S _9 t0 q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" v8 @' F% D! v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* a) O5 G( x/ E, B9 W+ ]
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ask roads [ set pcolor white ]
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end, l9 G" E3 L) E
其中定义道路的句子,如下所示,是什么意思啊?! @' B+ X m" H0 F R
set roads patches with
: _3 A3 G* M2 b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. A4 d2 R2 _# \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) p( q3 b; R8 Y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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