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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。
& q" d5 X, |: S6 enetlogo自带的social science--traffic grid这一例子当中," m; N4 M2 |0 J0 s' h* `
globals
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: u9 t9 ^* u0 X+ U& ]- I grid-x-inc ;; the amount of patches in between two roads in the x direction
3 {- Y F8 Z6 h" O& D2 C grid-y-inc ;; the amount of patches in between two roads in the y direction
o4 y t0 u3 I' P acceleration ;; the constant that controls how much a car speeds up or slows down by if
2 l* F& S5 T" r# o0 s0 p ;; it is to accelerate or decelerate
6 R) X( W2 I, J3 B) N. b phase ;; keeps track of the phase
' o7 W8 k" I8 ^/ L- h( p# { num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
{; W) W6 ~, t* }$ r7 s# c* s current-light ;; the currently selected light
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;; patch agentsets
6 a4 c4 K( i$ ?4 ` } intersections ;; agentset containing the patches that are intersections
: t# t" g0 m* \( ~ roads ;; agentset containing the patches that are roads1 J; G+ @! ]$ d; F- P6 k
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# G: U3 L- T9 u2 y$ C7 H% tturtles-own
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speed ;; the speed of the turtle+ q$ Z7 t: {4 r+ j) _4 O W% M
up-car? ;; true if the turtle moves downwards and false if it moves to the right$ V% V# |8 X( Q: h, l2 d0 ~) }6 O9 U
wait-time ;; the amount of time since the last time a turtle has moved2 b% {* H' `" q6 m
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patches-own% S, _" b9 ?4 p) B, E! o
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& I8 z, [7 L; O) o intersection? ;; true if the patch is at the intersection of two roads
3 w; ^' U' Q) z" b# t7 x/ I+ D green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 t3 p: F. r" m7 |- g+ Y7 E ;; false for a non-intersection patches.0 U: Z1 r9 `1 K5 @) n
my-row ;; the row of the intersection counting from the upper left corner of the
}! u; ]" c% o5 M0 ?$ U ;; world. -1 for non-intersection patches.$ W, j& J; P2 A& D
my-column ;; the column of the intersection counting from the upper left corner of the
5 t$ ~9 E7 u2 n& S2 O8 A ;; world. -1 for non-intersection patches.
9 J# L L }4 f+ D my-phase ;; the phase for the intersection. -1 for non-intersection patches.$ F; k7 f: n! ]: G5 _5 y6 Y
auto? ;; whether or not this intersection will switch automatically.
; c, O8 M/ s1 [$ P$ [9 {1 d ;; false for non-intersection patches." S$ p3 g- r7 E& J
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;;;;;;;;;;;;;;;;;;;;;;! k* r E) i) `) T$ F
;; Setup Procedures ;;
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4 m4 U9 c& Z. n ^$ d+ o& S5 q: O;; Initialize the display by giving the global and patch variables initial values.; L, L m+ ]" C1 @' o1 a, u* c6 P5 [
;; Create num-cars of turtles if there are enough road patches for one turtle to( z1 `) ^5 G6 M; y2 |! S( b
;; be created per road patch. Set up the plots.
2 a- t* k) a8 V; j( E- Qto setup
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5 P5 q# {! A1 p6 E$ k setup-globals, u, @! Y# L+ Q! a$ i# P4 }
( O0 q! _& `3 _ \/ O ;; First we ask the patches to draw themselves and set up a few variables3 `6 x) ]5 t/ a
setup-patches4 {+ R. }. v. S- ?
make-current one-of intersections \* S& a' `" v2 k O0 H
label-current
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set-default-shape turtles "car"
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5 Z6 u# K& D9 w; M0 C if (num-cars > count roads)2 P( R' p% V: s c0 q0 v$ Q- `
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user-message (word "There are too many cars for the amount of "
# \0 y% B E0 a4 J "road. Either increase the amount of roads "
" O1 _ p; R" @$ g/ o "by increasing the GRID-SIZE-X or "5 l" o0 T" \! _& @1 ?1 |% p+ V
"GRID-SIZE-Y sliders, or decrease the "8 j+ w; _4 I6 P, {! m+ R) C
"number of cars by lowering the NUMBER slider.\n"9 b* b7 O, B- q
"The setup has stopped.")
, l- A# H$ |; n3 q stop
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3 F# G5 D6 q& ^. T l& ~8 e; H ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% I, Y) O3 h- g' o+ b1 P
crt num-cars: \, g) ]& b" [& J: r/ r$ m! g6 `
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& u& ?% U% X- q0 G setup-cars
/ I: I7 `* C+ L2 ` set-car-color
* Q. z$ e9 j5 `! N3 E0 e6 C+ s record-data$ ~4 R1 j* M4 p; I7 @
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0 m% `* v/ @# a# D: J. m% [0 M ;; give the turtles an initial speed0 k* X3 Y1 R; U3 S9 f
ask turtles [ set-car-speed ]
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reset-ticks( [, O0 }! `. r/ n: g7 w
end
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$ ]0 A) ~) W6 o. a;; Initialize the global variables to appropriate values
, G( l. { e6 B% ]- y. wto setup-globals% ^5 h3 m7 \: }6 d$ v& h, {
set current-light nobody ;; just for now, since there are no lights yet
, p6 Q: ~, _2 A set phase 0! h- H! D# _- Q. G
set num-cars-stopped 0
, J- F# c1 O# c' c7 S' \5 ^ set grid-x-inc world-width / grid-size-x& w! e" `; g7 y8 A& Y
set grid-y-inc world-height / grid-size-y
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) {5 N$ X; P* B ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ N3 j7 u" Y' E- \0 a; K- `2 r$ @
set acceleration 0.099
+ V7 k" Y$ H# g' I) m# ]$ F, bend O1 E" b2 Q6 p/ e6 e
! |% z2 r8 b1 h3 a9 h) T;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ y3 j1 X$ H5 u% a6 r; U( @7 L5 m
;; and initialize the traffic lights to one setting
8 ?- s q$ n% a$ ]: Hto setup-patches
# S' F# g& `6 p% | ;; initialize the patch-owned variables and color the patches to a base-color T4 {9 f5 g' {5 r6 h8 q0 }
ask patches
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1 m0 V) C, ?1 `2 x! i: s set intersection? false
# A# D+ m- w9 \) C6 q0 r1 R set auto? false- {" a& j3 }% H$ h K" {: u$ z
set green-light-up? true
$ T& s$ T) K4 }; I% O( ? set my-row -1
$ m& W* m8 m, @* f set my-column -1' g+ X4 ~, ^" g: t: F# Z
set my-phase -1
+ |- e% m& s: _9 K8 c set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
0 R* [" }. l' I( \ set roads patches with
* R" h" B' t8 ]' t3 b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 \4 P4 ?( z& J/ V+ S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! J! ?' Y# M1 ?9 q+ _
set intersections roads with
& t0 X% G* v4 G+ l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 {$ w' K, e9 q# v/ | (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- \# I% ]$ l/ [- p* p! }/ J
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ask roads [ set pcolor white ]
8 ?, m. j) _, I; p3 o setup-intersections0 T$ c) C" ]9 ?- n. m
end
5 B$ L) L, A8 U1 ]1 l7 R5 U! E( v其中定义道路的句子,如下所示,是什么意思啊?* S; |/ j C6 S% ~% Z( Z1 ]- }9 c
set roads patches with
! s# c: B4 {, ]/ @5 d& T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 q" d' m3 S1 R' T. D1 Y% P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 q- n8 R$ [9 q3 w
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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