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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。
2 z! b* A8 ?' V7 D2 Knetlogo自带的social science--traffic grid这一例子当中,. E$ q1 \" a- H" A
globals9 j/ i1 }3 o1 b4 K2 U. f# L
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grid-x-inc ;; the amount of patches in between two roads in the x direction. n m2 m+ A8 r9 W
grid-y-inc ;; the amount of patches in between two roads in the y direction
" O7 i8 n4 x0 Q acceleration ;; the constant that controls how much a car speeds up or slows down by if; C+ I' v7 Z$ A2 c/ _$ _/ I' ]
;; it is to accelerate or decelerate
1 v- J# c d9 P9 _" J- K' H( S i phase ;; keeps track of the phase
7 |5 t% `/ W$ n0 B num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
" }( p4 v( e' D0 _& B5 f9 Z, u current-light ;; the currently selected light0 n+ ^+ {' X' Z( \9 [3 y
/ Y) ?2 O) G" \* I9 s ;; patch agentsets
( ~4 l5 s5 |. t intersections ;; agentset containing the patches that are intersections
4 L! E+ b4 p- E- u1 X) J" m roads ;; agentset containing the patches that are roads
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2 M! U* t7 L+ G6 y' h# [9 Zturtles-own
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speed ;; the speed of the turtle, k; n, c6 k8 i2 `( {/ Q* A1 i
up-car? ;; true if the turtle moves downwards and false if it moves to the right( g+ l6 l; c0 v4 s( H
wait-time ;; the amount of time since the last time a turtle has moved
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; c, n7 H u$ `/ s& C0 x( x) F# Epatches-own
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* q9 K* b w7 Z" z intersection? ;; true if the patch is at the intersection of two roads
- |& k* i8 J: n; G; o8 ? green-light-up? ;; true if the green light is above the intersection. otherwise, false.- x" {) b2 C% v% p: v
;; false for a non-intersection patches.
8 H' T, w% b! F) K; w+ Z( m# a my-row ;; the row of the intersection counting from the upper left corner of the2 X9 l! N+ P# O7 \# F- P
;; world. -1 for non-intersection patches.
: [0 h% e; u5 ^( w g" O my-column ;; the column of the intersection counting from the upper left corner of the5 W2 [6 X% s) h$ \8 j
;; world. -1 for non-intersection patches.
^" S( p! E( l6 a8 N) l: d my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. j7 h8 M& F" j5 Y auto? ;; whether or not this intersection will switch automatically.+ A3 j( t# M4 U9 a9 n9 N- e6 y
;; false for non-intersection patches.5 o4 u/ s3 B- A" l N3 P4 a! I
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; Z7 l. ]6 Q; e4 J4 V) i;;;;;;;;;;;;;;;;;;;;;;
9 N% {5 ~; ~: U- W x;; Setup Procedures ;;: h* K, B2 b% g, P' v/ {0 x8 ^
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w. i% C: w/ b; U2 ];; Initialize the display by giving the global and patch variables initial values." {9 k. b7 H! v, T1 m1 ]
;; Create num-cars of turtles if there are enough road patches for one turtle to4 W L4 V7 O( S; T! D! l Z7 Z7 S
;; be created per road patch. Set up the plots.) W2 m& I& w# x. h0 n, u
to setup6 f8 |* V$ r p# J; ~% X5 ^
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setup-globals- Z5 K/ t& M6 x8 ^/ p
+ b8 O. B7 X" q5 e# S! n ;; First we ask the patches to draw themselves and set up a few variables
/ _6 Q' m' N4 f6 O, Q setup-patches; [2 |% o, N6 w' t7 t9 q* k
make-current one-of intersections' g4 u% x5 `8 R0 y/ X
label-current% [1 s9 P( ]2 L5 u u! [
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set-default-shape turtles "car"
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( c0 X4 o1 D9 L/ A# Q% [. v4 f4 i if (num-cars > count roads)
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/ j* I: _6 r3 g5 W, q$ A- E4 H user-message (word "There are too many cars for the amount of "5 ?. c# r. L" a3 v6 P; _2 O
"road. Either increase the amount of roads "
5 h! Z4 x4 A7 ]; R m% A "by increasing the GRID-SIZE-X or "* [9 B( l+ ?5 @. b! N# r9 X4 J
"GRID-SIZE-Y sliders, or decrease the "
7 r0 n1 y" { Y "number of cars by lowering the NUMBER slider.\n"
: r8 D5 V4 u D "The setup has stopped.")
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# ~+ D/ Y1 @) f# i, |9 i ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ y$ o$ V+ K; y7 p- O+ o crt num-cars
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setup-cars0 [# H/ V1 `" _# ]- e. d
set-car-color
, V% T: I2 x# u record-data
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;; give the turtles an initial speed+ r" [% R4 j6 [5 o! P) ?8 [
ask turtles [ set-car-speed ]
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* v4 E) y0 c2 r6 q1 T reset-ticks, v( Q7 |$ ^! J5 X$ a
end) V$ \4 t8 Z% o: p" ~
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;; Initialize the global variables to appropriate values% m# _# b& u6 z) N4 v
to setup-globals- o8 H" b. n/ h: m. J G
set current-light nobody ;; just for now, since there are no lights yet, Q ^+ A" C' y- w6 ]& n# H8 k6 r5 z
set phase 0
* p: c- A" q6 m9 }) j4 l set num-cars-stopped 04 {3 e7 R* }0 n) m( y, [
set grid-x-inc world-width / grid-size-x
* s3 p0 E# G f6 Q* @ set grid-y-inc world-height / grid-size-y- Q# B# B% h) F! E: v/ z
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 Q' `, ?8 E0 i5 r) h set acceleration 0.099
3 M, d- D/ a" P3 Q8 X; Z* Eend
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$ M# K7 t! Q# ^ s;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% I& E- [! Y0 d- T4 m6 ?;; and initialize the traffic lights to one setting
/ h. l; N5 J* i k- g' _) Rto setup-patches
( l0 G* d( @, O5 R) [( l ;; initialize the patch-owned variables and color the patches to a base-color
# F1 j7 Y* l; U6 u) n! Q ask patches* \% j* v+ ]7 U6 P3 C& @" l% u& e
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set intersection? false W; `8 p7 E5 ^
set auto? false
" G ?4 E" r* D3 Q) x1 s set green-light-up? true7 E# K+ {6 T+ p* m. j
set my-row -1: d# I+ K: D% h% h
set my-column -1
K8 h3 r% W% S; [. C; I set my-phase -10 M4 z3 T4 f/ ?% a4 p$ y
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets1 a) {6 R# F, F) e( K7 S! X T, g1 m
set roads patches with
5 W( B5 _$ F4 X. L6 }4 Y$ \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ }" C7 h& Z1 E& G6 M% W Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" { X G+ U9 x0 z* K9 o; {& C1 M( E2 C set intersections roads with+ E. I" [4 e; r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- I- A5 n5 o# _% d- Q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 W% c. Q4 s2 l* ]8 e
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ask roads [ set pcolor white ]% B% a$ `' A+ b! R8 K4 A
setup-intersections
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) b% N" R: a) g. x3 I其中定义道路的句子,如下所示,是什么意思啊?$ T! s; b4 ]% m: b% ~: t+ |
set roads patches with. F3 p6 i1 F+ w) T J
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 I# ~& L3 L5 J) F8 E (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 v& ^ l2 o( a/ 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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