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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。
5 v P/ `1 V( enetlogo自带的social science--traffic grid这一例子当中,
2 z8 y; O( _, }& l1 Kglobals. P* E- K$ Y& @4 G. U1 ~6 i
[
; L2 b0 n4 m- C2 a4 D grid-x-inc ;; the amount of patches in between two roads in the x direction7 ]& ~0 Z* ]% C9 L0 r! L
grid-y-inc ;; the amount of patches in between two roads in the y direction$ {3 w$ f$ B5 {0 W: u$ d3 T4 }
acceleration ;; the constant that controls how much a car speeds up or slows down by if
/ d. D0 F+ ]4 X" i) |8 C" Q& C; z ;; it is to accelerate or decelerate3 S0 k- C0 ]5 b7 A( r4 b% U+ w2 q5 n
phase ;; keeps track of the phase- ~. d; k5 r& `& b. F/ L
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure5 b) @& O" ~% d* e! k3 d9 @
current-light ;; the currently selected light) e, b- E/ g4 R" ?% J I4 G0 f" m
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;; patch agentsets
|$ Q5 `: r( Z7 D intersections ;; agentset containing the patches that are intersections
! a4 Y% I% e' B5 Z roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle( ?! n" s% D8 i# v2 N" v6 B# z! Q/ {
up-car? ;; true if the turtle moves downwards and false if it moves to the right
' x- f. O+ j: R wait-time ;; the amount of time since the last time a turtle has moved, v& w, l" q0 V
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2 Q% u, f" Y# I! Fpatches-own n5 F# Q) U5 S( [
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intersection? ;; true if the patch is at the intersection of two roads6 I( |) g1 j8 N; i6 H
green-light-up? ;; true if the green light is above the intersection. otherwise, false./ K, Z7 B2 F$ @, I! m7 p( J8 {' o
;; false for a non-intersection patches.
! D' ]' a2 ?+ c& D% U my-row ;; the row of the intersection counting from the upper left corner of the
; i! S J% z! w3 ?, O" `# r ;; world. -1 for non-intersection patches.3 p; I$ \& m" ?! F
my-column ;; the column of the intersection counting from the upper left corner of the
- h; y1 T8 t; J& S6 g, p& p% L: e6 A: u ;; world. -1 for non-intersection patches.9 e0 j- q1 W3 e6 O$ E
my-phase ;; the phase for the intersection. -1 for non-intersection patches.$ r( f2 T/ s$ o1 G2 Y
auto? ;; whether or not this intersection will switch automatically./ ]. P( N; O, `
;; false for non-intersection patches.
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$ _9 o! A, l! D;;;;;;;;;;;;;;;;;;;;;;* `* K0 ]. U6 E% [- h
;; Setup Procedures ;;
/ ^7 y! J2 j8 K) C! M;;;;;;;;;;;;;;;;;;;;;;
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# p3 o8 |8 ^, \; p; X! \! D;; Initialize the display by giving the global and patch variables initial values.5 Z/ }5 c0 y z" m* t! D) e- u
;; Create num-cars of turtles if there are enough road patches for one turtle to
1 I2 O% p7 Y! n;; be created per road patch. Set up the plots.
4 U: {3 H' Y- o8 s& G% g! \to setup6 F; h" K& Y( X3 n/ q; T$ L- U
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setup-globals# W4 [- i5 N9 S' v+ [8 C
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;; First we ask the patches to draw themselves and set up a few variables
9 I. b" @3 |: D' `6 y setup-patches( c& d. g/ j) _$ _9 v0 @# n \
make-current one-of intersections
0 C! m0 x8 d2 v% p1 K8 o label-current
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set-default-shape turtles "car"3 T8 q) z. C( Y! d7 B, \
# D" z- w! P( I; x( l+ |- N5 Z& E if (num-cars > count roads)- e4 H, b- r6 i8 Z) R: S' L6 H4 a
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5 o* b; M. Z" Z6 V0 W2 d( e/ _/ p& U. R user-message (word "There are too many cars for the amount of "
7 u' u- ]1 J7 f s "road. Either increase the amount of roads "
1 M- B. c5 O# l/ h/ s "by increasing the GRID-SIZE-X or ", \/ `0 P/ F; ^2 Z7 Z9 `7 o& C
"GRID-SIZE-Y sliders, or decrease the "
8 [) n1 | p y* J$ i- q "number of cars by lowering the NUMBER slider.\n"& f; M+ a9 |' m! {% Y
"The setup has stopped.")
# S- M2 }9 c5 Q0 y6 \& y1 f stop5 D8 a5 S ?& a1 }# a
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6 Z6 R H4 j1 O& I# W$ T) c ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 v) N6 R" v: f0 \" P3 R7 Z. a
crt num-cars$ J3 b4 j+ C8 I5 J$ s7 }4 c& d
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setup-cars4 l* J2 w& W7 ?1 R. h. \: h
set-car-color
& y; T% G6 |9 G" \- `5 c/ M record-data( Y8 V3 G& d5 l2 R! t9 k
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2 U5 Z) w5 U, o( u& i9 d7 A ;; give the turtles an initial speed. A9 A: P6 ?, {4 l% q4 M8 _
ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values k" w& i4 K5 {- q0 m9 H
to setup-globals
( b6 f- E) ^+ Y- `0 r2 R8 O0 J- n set current-light nobody ;; just for now, since there are no lights yet
! k- f/ `* [2 i set phase 0
) K( ]2 j& p8 F7 ^9 ?& ^, R set num-cars-stopped 0& ?6 u9 ^3 B3 ?! f- s$ B0 d
set grid-x-inc world-width / grid-size-x
; G- {- k% e, ^ set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 |, F, T- N' W
set acceleration 0.099 E8 w7 g' m$ b
end3 d" A. `' X* C' Q5 |& H1 _% @
8 O! a, H% a2 s/ S8 ^;; Make the patches have appropriate colors, set up the roads and intersections agentsets,3 l l+ q4 V6 u& g/ J. A( b" d
;; and initialize the traffic lights to one setting# f5 n$ `3 ~) N4 J1 n' [5 o- Y
to setup-patches) W4 F/ l/ d. x( r9 ~
;; initialize the patch-owned variables and color the patches to a base-color
0 J$ ^( k: b, {' r$ J( u, K ask patches
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set intersection? false& o- m3 u* Y# I
set auto? false
A% L0 C6 o' H6 k( Y set green-light-up? true$ I; ?3 }% n; Q Z( x3 d/ U! r" }
set my-row -1
d8 E+ [8 W; O set my-column -1* [" M" B4 [& P2 C- O
set my-phase -1# l; V# `$ _, y5 u& x7 u5 `- _
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
" \! w& U7 k) a. ~) c set roads patches with
# \ \ O; d. w9 p% V& q% I [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 t2 C- T9 k2 ^! d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& D1 J5 B& a' N5 `( d6 N/ Y2 ~6 e set intersections roads with
' B: x& q6 q/ A- R. n% r [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. {% H1 t/ |) [1 d! E0 Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 R# j2 U% }1 w/ t
* Z( N( Q& n+ b' s. r+ w ask roads [ set pcolor white ]: R$ N$ v4 s; f/ a' F0 b: a
setup-intersections
# D5 v4 }7 D4 s; v( D. k1 ?$ m7 B0 Cend
0 Q( z c4 h L其中定义道路的句子,如下所示,是什么意思啊?
# H. n- Y+ Y, ~ set roads patches with
4 V, Z8 c6 L; N# r7 ]( [! O: x) q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 e) z& W7 t8 d( u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 c' A3 ?: X |+ {
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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