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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。; S6 @: T# E' t- {/ V- K, A% L: J
netlogo自带的social science--traffic grid这一例子当中,- V3 k: d5 m3 ^5 O) G' i% @+ @8 u
globals; i: A/ H! a; _2 i+ ~) A+ X% S
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grid-x-inc ;; the amount of patches in between two roads in the x direction+ a0 y6 B. Z2 G7 q }' R
grid-y-inc ;; the amount of patches in between two roads in the y direction
: x6 `8 r. ?- N: j" H! g acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 w5 O. Z: \8 _3 o7 i+ P, t; U, L8 ? ;; it is to accelerate or decelerate& @5 T- q8 v1 q/ b
phase ;; keeps track of the phase
6 z1 I5 ~9 P4 h. p& L num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ R) _- q; ~% |9 n current-light ;; the currently selected light6 q) i8 g* q9 T7 A
' o1 w/ ]4 U) x r! R% H) P# K ;; patch agentsets
& T; Y9 T2 ?) r6 J! G( \1 o intersections ;; agentset containing the patches that are intersections
, E0 R) [% W; j! q roads ;; agentset containing the patches that are roads# T7 z6 c0 I$ s' L7 |- E( @6 a) i
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turtles-own
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4 t% a6 B* a, X/ \; Y speed ;; the speed of the turtle
/ e+ H( B, M" G y up-car? ;; true if the turtle moves downwards and false if it moves to the right
4 A0 j% u" I& q8 q+ L: M+ V" I wait-time ;; the amount of time since the last time a turtle has moved4 r8 j2 I! C$ I! e }
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patches-own. U- N8 Z C/ t, n. q# U! a
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intersection? ;; true if the patch is at the intersection of two roads) e+ Q5 Q& H# l" d! t E+ v
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
+ Y' ~# M# b2 |% b5 v9 P ;; false for a non-intersection patches.
+ {, S7 {$ p% {% E% M0 C Q my-row ;; the row of the intersection counting from the upper left corner of the
" N# s8 l4 R2 e/ k ;; world. -1 for non-intersection patches.
, T c; `- h4 z6 B my-column ;; the column of the intersection counting from the upper left corner of the" R3 `; X j' \
;; world. -1 for non-intersection patches." Z$ c: \5 F0 a/ _
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
; k. z2 t, ~: ~- K$ m) O auto? ;; whether or not this intersection will switch automatically." M3 s/ K; Q* ~+ V t6 J( H7 Q
;; false for non-intersection patches.2 b8 `$ n, ]! o! v+ T$ D
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;;;;;;;;;;;;;;;;;;;;;;) \* ]( H# m" N0 v4 a
;; Setup Procedures ;;
. ~: n+ f9 ] R6 ~) a7 }4 h;;;;;;;;;;;;;;;;;;;;;;. O$ R3 y. }; q7 p; r
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;; Initialize the display by giving the global and patch variables initial values.
! R$ H. `" t5 [8 z: }" I' U;; Create num-cars of turtles if there are enough road patches for one turtle to$ ?9 m9 c7 b2 F! w
;; be created per road patch. Set up the plots.
5 B1 q6 M3 M3 E. Cto setup
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2 E+ M/ Z+ F8 y; | setup-globals8 @% o% O7 Y/ Z# ?( H4 R8 f1 {8 b
8 Q. x9 a Y! O7 _8 C; d( V- N; ?9 x ;; First we ask the patches to draw themselves and set up a few variables
& h, C; f5 F: ?$ Z# g setup-patches) D9 o$ m( {& p+ r* U. W' y
make-current one-of intersections+ @; b( U! e$ d6 M
label-current
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set-default-shape turtles "car"
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' p% o6 m& C: ~- t- {/ T if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "" V! R3 ^$ {7 Q
"road. Either increase the amount of roads "4 M! h0 F9 G# T. Z' H2 n2 h3 L
"by increasing the GRID-SIZE-X or "1 G+ u% P2 h! ?! n( Y% a5 Q
"GRID-SIZE-Y sliders, or decrease the "
8 x) n" L6 A: f% b" z" T "number of cars by lowering the NUMBER slider.\n"
2 r* S; t2 W5 g: |: W: P$ ?+ z "The setup has stopped.")
$ s2 r4 [0 }% F stop6 z! F) d o+ B$ r# w/ ]# z6 F
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 f% u& k: O# q crt num-cars
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setup-cars" n: s/ q" V' t" S$ g9 E' |6 q# o
set-car-color
. `; r6 X# |6 W record-data
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2 i+ m" ]9 t2 x: J ;; give the turtles an initial speed
# n& I( f! C! k- K9 r& b ask turtles [ set-car-speed ]% R0 n7 i# ~: N# y5 C8 l
; @+ ^; W( D! R2 t' ]- I reset-ticks9 y) \9 r5 O* T1 c8 I& t: T* R' N" e
end
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;; Initialize the global variables to appropriate values
+ M( [9 m$ r+ E% e* o: Tto setup-globals
' S& Y0 H- P; C set current-light nobody ;; just for now, since there are no lights yet
" W N- _/ B% O5 J) K4 Y+ H8 R& w0 M set phase 0
8 `2 T$ f9 H- |, v- q* g D0 S set num-cars-stopped 0
8 v e! \7 |$ |8 \6 k set grid-x-inc world-width / grid-size-x
+ \) v/ t9 Z1 R% C! d6 @ set grid-y-inc world-height / grid-size-y) I2 a; P' X4 K- a
5 U- v, c6 z/ D4 s% S ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 D3 X& J+ S6 N% W
set acceleration 0.0999 i, ~* j7 U. x5 e
end$ C. Q6 K; ~4 \: h. A8 k
1 I ]! F, D6 @ s;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' p- U1 f# ?' _, z# j( e;; and initialize the traffic lights to one setting3 }4 `' M7 i0 _
to setup-patches
8 y, f- v7 U z H. h5 `# C ;; initialize the patch-owned variables and color the patches to a base-color9 P( V' V/ o( g
ask patches, U! W9 r& v; m) l
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( T+ I. ^( ^5 @' r3 f1 Y7 f set intersection? false) a1 h) Z/ v8 [$ n8 }: `
set auto? false
$ d W$ }+ ~& o$ c$ z9 G set green-light-up? true6 h q' w2 _) R0 r+ ^
set my-row -1. P9 P: s" _/ G3 c! l* ~
set my-column -13 |! u9 }* o( g9 Z
set my-phase -1( [ \; v& @9 y1 ?5 m9 H
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
# S) m% e% | | set roads patches with
; N" o! Z3 N c- o6 c4 H- w3 w" Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 T1 H* c) f4 E$ Y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: x" J4 e! P% J% F& G& R1 s
set intersections roads with
' V# f& Z: M& j. B) q% \; { J4 H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and4 a( y6 ]9 D8 b* t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! n$ z. \' S3 s+ j6 z8 u7 x
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ask roads [ set pcolor white ]0 Z$ h+ W! I1 o1 a- o6 e, C5 D" k& g
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
3 _6 r+ g& @& B. y5 h+ v3 v set roads patches with; G) S! z7 v6 ~# B+ J0 \- h* u* P5 n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' B2 H4 n p- S (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) ]: P% ]# Y3 ]* L+ s- A) w/ w, j, | 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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