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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。
: C0 ~6 l1 F2 n" knetlogo自带的social science--traffic grid这一例子当中,' a+ o0 T4 z3 t, h! f1 z- _# W
globals
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& U9 J: H+ u+ |4 G3 |1 _ grid-x-inc ;; the amount of patches in between two roads in the x direction
# k: l3 n7 ]; W7 p2 P$ [ grid-y-inc ;; the amount of patches in between two roads in the y direction
' m8 m' ^% T/ q% f2 j acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 S m+ k$ O0 O+ d4 R5 C/ ] ;; it is to accelerate or decelerate
1 J( x4 V5 }( P2 W& U7 l phase ;; keeps track of the phase0 v3 k( J: l2 m
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
" e2 U- G6 B+ e% g' J9 ]' W current-light ;; the currently selected light" O% S$ |/ }7 E
8 f, R+ G7 ~& p9 Y* h ;; patch agentsets$ G! x% V- C0 F4 W) b/ `4 O# Y4 o
intersections ;; agentset containing the patches that are intersections4 I. _' R8 L8 T) Z, Q. z9 }+ [9 \8 i
roads ;; agentset containing the patches that are roads
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4 _9 n7 N: h" B0 jturtles-own
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) ^* N- d+ K) r& ?" D' k5 T4 ?8 n; v speed ;; the speed of the turtle
1 k/ k6 y9 n; U, ` K0 _ up-car? ;; true if the turtle moves downwards and false if it moves to the right- L5 L8 Q! q0 e# @2 E3 n+ Q! o4 Y( e
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
2 T: N2 J$ Q' Y2 D( z. ], j green-light-up? ;; true if the green light is above the intersection. otherwise, false.7 R+ w3 W/ C6 m$ j* g
;; false for a non-intersection patches.
2 p& u. B+ l }3 W% m my-row ;; the row of the intersection counting from the upper left corner of the
( `4 p9 u& s; F7 Z9 C ;; world. -1 for non-intersection patches.2 T% E9 h9 n; e% T
my-column ;; the column of the intersection counting from the upper left corner of the
0 B' ~, i; J; Y1 T- Q9 v ;; world. -1 for non-intersection patches.6 Y4 ^/ _6 I9 z7 K u
my-phase ;; the phase for the intersection. -1 for non-intersection patches.; k; q6 V, i& ^0 P" a/ T6 y$ v6 ~
auto? ;; whether or not this intersection will switch automatically.. `( ^% m% @$ @- b$ c Z
;; false for non-intersection patches.. ?' |, O2 h' j$ z+ {
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; E- X& z. f/ ^. R# I$ X; _8 s;;;;;;;;;;;;;;;;;;;;;;: q& h: u1 ?5 {5 p
;; Setup Procedures ;;
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8 f8 X* g9 i% Z0 E4 A5 F6 e;; Initialize the display by giving the global and patch variables initial values.$ }$ b3 @' r, |1 A; g
;; Create num-cars of turtles if there are enough road patches for one turtle to
5 o& P1 B4 r7 i; y8 Q3 Y" u;; be created per road patch. Set up the plots.4 ], ~. A7 P% ^: m
to setup
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setup-globals
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3 F% q& y/ \- W5 x7 [' l6 a, L/ d ;; First we ask the patches to draw themselves and set up a few variables
0 q% i' i9 b+ c setup-patches2 f& o* b& K# D% w5 ^& G) k
make-current one-of intersections; M6 a' a8 h/ V7 h# U
label-current
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: c0 |/ r3 V8 ?0 s) w3 X set-default-shape turtles "car"
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: L# I9 r- Y0 w0 x0 D6 F# e if (num-cars > count roads)
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* o) X% u( w- g0 [. o1 R! N' B user-message (word "There are too many cars for the amount of "
9 g) q1 k3 [; I- p' f) C& @ "road. Either increase the amount of roads " I( ]9 X/ F9 f
"by increasing the GRID-SIZE-X or "/ e. L- E+ `- ?/ `
"GRID-SIZE-Y sliders, or decrease the "
1 `% G! E E+ k5 G; Q! K "number of cars by lowering the NUMBER slider.\n"
# Y4 U* ~2 t( \8 S "The setup has stopped.")
" }9 _4 z; o+ t6 m% p stop! y9 w. d, g7 V* c% b5 G
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2 u; U+ R4 i3 A# U/ ~% [. M+ R8 n) R ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( C* {/ r9 g) f* a2 _% u; A! ]
crt num-cars+ M- e' ~0 x9 I' f* P1 a. t
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setup-cars
5 ?6 [+ `+ |! X/ @6 Z8 L" N. I set-car-color0 J0 @5 ]9 s2 L6 G
record-data
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;; give the turtles an initial speed0 e. f9 C% h) @; K; l" s
ask turtles [ set-car-speed ] B/ v8 Q2 M# @( }" c
' _7 J5 n1 h( a0 h g reset-ticks
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;; Initialize the global variables to appropriate values. ^ M0 P0 l6 s9 s
to setup-globals6 U" L: g6 F6 U( |1 l
set current-light nobody ;; just for now, since there are no lights yet
O5 ]# [8 Z& ]" e; \' ~ set phase 0
$ ?2 ]; k3 T4 [2 Q7 \ set num-cars-stopped 0
4 \* y9 H7 a" G: G set grid-x-inc world-width / grid-size-x
0 `% K* E1 }. V) j f set grid-y-inc world-height / grid-size-y. r; B5 y3 l1 i- P! r" L
1 w# f" K6 e- `, x3 K ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary! B$ z: c) S3 v9 c& P
set acceleration 0.0997 g! z0 r1 S' w/ a* I! Y
end6 r5 `! m8 d3 h/ Z# r% Y
E5 P& N! `' x# ~$ n, R6 R' O/ X;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 T/ t0 o5 v& R# k9 J2 j+ J3 D
;; and initialize the traffic lights to one setting: E; W+ Q( L4 w$ C8 j
to setup-patches! d; D9 J7 V& |% Z; J
;; initialize the patch-owned variables and color the patches to a base-color
5 s# E1 x0 R5 Y( J ask patches
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9 n) }) b7 o: U. m3 Q+ n' k- m set intersection? false
$ S" y; }$ I" X/ z! x6 ?$ @ set auto? false
! g+ S$ J2 e) i) Y$ ^/ P r set green-light-up? true
( x) v* L! L6 ]- d set my-row -1
' \7 x6 }2 e3 J% S e: s) O0 F set my-column -1' n r% d- N! n: c& ~4 [7 S* R! y% v
set my-phase -16 Y9 P- P0 I8 j# X1 @8 g
set pcolor brown + 3
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3 S- X- h g3 C e( \ ;; initialize the global variables that hold patch agentsets
# ]* A& H# h- L* |7 s set roads patches with2 I8 Q7 k% c- ?: n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, R; v4 l5 `8 M2 w2 _) l' I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 w. z. |1 ]4 g+ P& h8 a set intersections roads with2 g! C3 i# S; [$ a. ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and( k5 o( w& Y' I7 L% F3 T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]. T% O4 A' n, ?% p! `
setup-intersections
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8 i5 }/ y$ o- k% V2 N% o9 [其中定义道路的句子,如下所示,是什么意思啊?
; }% Q1 L; q% e/ r. m0 v: l set roads patches with
% A( n+ Q8 J' l$ C0 N' M- v7 g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* W% ?, f' o4 a% [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 y8 ?! F2 q9 f1 B
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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