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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。
1 I7 i& d2 M+ W5 x0 h0 [) L/ r) R3 Z) `netlogo自带的social science--traffic grid这一例子当中,8 Q+ W+ s6 H) \1 S* n
globals& j0 ]9 ~7 m& g; O* v- s7 b4 n
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+ j4 T, j$ Q! d8 M7 V( Y8 D3 U3 e grid-x-inc ;; the amount of patches in between two roads in the x direction4 s ?: g3 y8 Y
grid-y-inc ;; the amount of patches in between two roads in the y direction0 c7 s X9 h' V( K; ^* \
acceleration ;; the constant that controls how much a car speeds up or slows down by if
* b7 q% w% d) `/ Q, U ;; it is to accelerate or decelerate8 T, d) O9 x1 T% A3 {
phase ;; keeps track of the phase$ B7 d# E" M0 C. N: N
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure+ ]* a# k+ ]6 N# B* y! c @
current-light ;; the currently selected light
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;; patch agentsets
4 l( ?5 H. O3 h T1 B% z intersections ;; agentset containing the patches that are intersections
- p. [% M# n1 r- _3 A' n9 l1 E roads ;; agentset containing the patches that are roads" h( b8 T7 m# S7 v1 I# |
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turtles-own% t$ ?+ E4 a* U% I
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speed ;; the speed of the turtle
. z9 [& I- s+ q5 v. Q# M" {8 b up-car? ;; true if the turtle moves downwards and false if it moves to the right
6 M) Z3 w3 L9 B% d$ a wait-time ;; the amount of time since the last time a turtle has moved: J- ~8 j$ n) f& |
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s/ Q. ^. d J" U) Qpatches-own
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" v% f; `' J0 Z! r! K intersection? ;; true if the patch is at the intersection of two roads4 n ^2 i* s p/ {
green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 i9 N9 T K: A2 x( f/ T+ C
;; false for a non-intersection patches.5 W: D( z# S' ~$ j7 ]1 t" [* H6 c
my-row ;; the row of the intersection counting from the upper left corner of the
1 d2 E" _8 ?$ g c ;; world. -1 for non-intersection patches.$ {- x+ t4 i8 q
my-column ;; the column of the intersection counting from the upper left corner of the4 A3 [# Y9 \& b8 g/ v( Q- u% H
;; world. -1 for non-intersection patches.
1 X) \) m4 n% f& t- A9 l; S my-phase ;; the phase for the intersection. -1 for non-intersection patches.7 i5 b) ?# j6 l& X( }
auto? ;; whether or not this intersection will switch automatically.
% b+ m: c; E" ^0 t* J0 g5 j7 i& S$ d ;; false for non-intersection patches.( f" s4 v3 W. Z: A$ o7 @; O
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;;;;;;;;;;;;;;;;;;;;;;4 J2 |% c, A. l# N7 M9 a
;; Setup Procedures ;;3 @" h0 c4 ]3 \
;;;;;;;;;;;;;;;;;;;;;;% ~! ~8 E1 L# ^3 {
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;; Initialize the display by giving the global and patch variables initial values.# F, ?* H9 c$ Z& n( D7 P
;; Create num-cars of turtles if there are enough road patches for one turtle to+ n; b8 A7 \1 e, w& l
;; be created per road patch. Set up the plots.
+ k5 }; _6 M/ q e1 Xto setup8 r; r2 |6 H0 C" L. F
ca
! `0 i! y9 W7 L8 o/ Z setup-globals
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7 E& F" {5 a# p/ y! N( i+ D- C ;; First we ask the patches to draw themselves and set up a few variables
- c* E2 I( t2 u' H6 ~ setup-patches
! B: l5 [, {2 g5 E9 _ make-current one-of intersections; G1 i* g* M* g/ R7 B W; ]
label-current
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set-default-shape turtles "car"- T- e& d7 M! o) o4 A0 k. S! v
7 x" K0 _7 r9 J- U5 Z. ^/ ~' d' e) O if (num-cars > count roads)
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: q- j) k' v e6 M4 V% ? user-message (word "There are too many cars for the amount of "$ {+ ]; X- a- @ I4 k3 J. P
"road. Either increase the amount of roads ", m- Q$ q3 j1 o- ?
"by increasing the GRID-SIZE-X or "* x/ H# B# T9 {& n" L
"GRID-SIZE-Y sliders, or decrease the ": h7 ~8 M: J% { b& u9 l
"number of cars by lowering the NUMBER slider.\n"8 r7 [ D! n k3 ~
"The setup has stopped.")
7 a. w+ a: W( D4 k+ x+ X stop
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9 l- _9 [, z: Z ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 r" G! A3 k- M5 u$ l
crt num-cars
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9 w2 p, v" w1 ^; J5 d setup-cars) {! T9 }; y& @; c, G: n2 l( Z
set-car-color" \* C+ d" E% ]: G; l. S H
record-data% d* d1 x% u, k+ C) N% w& P
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8 h2 \9 T3 l6 l3 L5 q9 }3 Q9 U ;; give the turtles an initial speed
0 E$ l6 s8 _# w# b ask turtles [ set-car-speed ]
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/ |0 N y. l c8 n( T. R reset-ticks ]; `# [& y& h$ \7 @
end4 L6 f5 v' v: c" D7 c2 _
8 ]- j. l; S& J$ P' k;; Initialize the global variables to appropriate values
1 E; [8 q$ L% }0 s8 t9 R6 cto setup-globals5 z8 A5 t5 A: g; s7 ?; o+ S
set current-light nobody ;; just for now, since there are no lights yet8 j% K) @' ]& M' Y# N* I
set phase 02 F8 S' w }) [) a3 m6 i3 U
set num-cars-stopped 0% l1 d9 E3 W& s
set grid-x-inc world-width / grid-size-x$ `/ ~+ _- ]5 [! f
set grid-y-inc world-height / grid-size-y
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. h$ l2 ~/ M) i- B6 K) @ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
% J" C! A+ `, F7 \, H; a' A set acceleration 0.099
$ R# a; k, w- n1 B% J) [end/ b$ z( e* G% s3 e' @3 R
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; ]- T* M, z, o8 a; V
;; and initialize the traffic lights to one setting6 o% g1 }( \0 M C
to setup-patches! \+ j+ f5 ?7 W" o# t9 \
;; initialize the patch-owned variables and color the patches to a base-color
3 {( \* i6 U G# ? ask patches1 O1 j, t/ E( E) p! Q2 V' {( y
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set intersection? false! F$ P7 i& _, o/ |: @
set auto? false
! `; U( t# X2 Y# P. Z6 e J5 W* B set green-light-up? true
- J1 @6 G4 d1 t6 |, w- W7 L set my-row -1
- I* f; y8 z8 |) E set my-column -1
d0 b8 d0 M# n0 V* K. A3 B set my-phase -1
+ h. R4 c" r$ S6 D7 q set pcolor brown + 3
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- L0 b/ @5 J- {$ o) d* w: j7 a ;; initialize the global variables that hold patch agentsets9 |/ R! w$ l8 f$ C$ [7 f8 N
set roads patches with
" W" R/ f# C* i- I [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! Y. E' o/ |$ e1 j. p+ s6 J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; m* h% z* x; Z5 j2 Y4 O2 ] set intersections roads with
& y" v' z _# Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ |; r5 D% p- |7 r (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ], |/ m q0 w) R2 P' {* k
setup-intersections* B, B& l* i: _3 n$ _" V& w3 }
end
8 j- y T1 j$ F- ]1 [! f+ Z: a其中定义道路的句子,如下所示,是什么意思啊?
9 [/ W# x6 _( {: g/ n. Q2 r, E set roads patches with3 ]& c& a) _- P1 r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' b' C5 @& H* W& o8 c; M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 K' C/ q X# s! Q! |. z1 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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