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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。
/ N B; n; ]7 h( y. u! y5 g8 snetlogo自带的social science--traffic grid这一例子当中,
# G+ j( m. } t( O% K3 h# g; _globals4 S% U: F. c5 G$ o& c% y* u7 k8 `
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. H; t9 |+ k- F grid-x-inc ;; the amount of patches in between two roads in the x direction
% `4 h- ~) C [4 t2 k grid-y-inc ;; the amount of patches in between two roads in the y direction4 |. n* `9 P( s5 L3 w5 c: [
acceleration ;; the constant that controls how much a car speeds up or slows down by if. I8 j, @: _1 v6 a- ~3 w
;; it is to accelerate or decelerate
9 @- x2 ~* y; s phase ;; keeps track of the phase
) i1 Z' K+ A5 z2 u* o$ Q, ]7 u num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure- f& p! _ j' M& |, s
current-light ;; the currently selected light# d) ?; `3 Y* X; o, ?' B9 y
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;; patch agentsets
8 _4 h/ A& t5 e" s intersections ;; agentset containing the patches that are intersections/ Q+ l7 ]/ R3 i4 f; Y% i! [
roads ;; agentset containing the patches that are roads
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turtles-own
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' Q5 l! D' q) J speed ;; the speed of the turtle( g, `) @ @" e
up-car? ;; true if the turtle moves downwards and false if it moves to the right
$ T" s. v# W" B7 Y: k2 X, x wait-time ;; the amount of time since the last time a turtle has moved
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! ~! [3 ?2 D) J+ cpatches-own4 n/ r- f+ o( l: H/ o3 B9 f
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intersection? ;; true if the patch is at the intersection of two roads8 P% f' Q0 o7 V+ V' a. m
green-light-up? ;; true if the green light is above the intersection. otherwise, false. A! c2 U. o! Q6 @; g+ h
;; false for a non-intersection patches.4 p7 [( W& x7 Y5 B T: H' f
my-row ;; the row of the intersection counting from the upper left corner of the
m% _, E$ v- `3 k \7 r$ K ;; world. -1 for non-intersection patches.* C# S4 Z* {( m& k3 C3 V1 o- K+ K
my-column ;; the column of the intersection counting from the upper left corner of the# S9 c/ ^* h9 ]! w& X7 \- n
;; world. -1 for non-intersection patches.% `* o& ?7 ^( ~* k/ P+ W! ~
my-phase ;; the phase for the intersection. -1 for non-intersection patches., t5 t, t: V3 u# L) U/ q' e# K! f
auto? ;; whether or not this intersection will switch automatically.
, M4 I- ?% i* x9 j9 {! E7 p ;; false for non-intersection patches.7 R+ |/ y4 o+ I3 j. A
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;;;;;;;;;;;;;;;;;;;;;;
( S" H# N! o. }9 S5 t' ]! z;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
+ Y4 B4 k8 B8 g0 ?/ M4 _. I7 {;; Create num-cars of turtles if there are enough road patches for one turtle to
# |* {( C* @ d* j1 f;; be created per road patch. Set up the plots.
9 r7 R+ e r1 d3 |& sto setup' w( M# I2 o- d6 [9 }. e
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables7 W' k9 H/ f) v$ V( t' z0 f
setup-patches) d8 |; k \ z+ a# P4 w% J* |
make-current one-of intersections6 c& b3 l- N @
label-current* P9 L. [$ y l$ K7 M2 a6 O
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set-default-shape turtles "car"
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if (num-cars > count roads)& F7 ?$ I' }4 f/ ^' w: |1 j/ S
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user-message (word "There are too many cars for the amount of "
! _: I" |/ p( {5 q) T# H0 e "road. Either increase the amount of roads "5 a2 J* i0 s: Z$ {9 \7 S7 P
"by increasing the GRID-SIZE-X or "
- t1 s- Z5 e! ^ k "GRID-SIZE-Y sliders, or decrease the "
9 {, b. _0 _& z' D& U- R9 ^: a2 v4 k "number of cars by lowering the NUMBER slider.\n"- l5 w$ J- u ?1 b
"The setup has stopped.")
& n- `+ v) U& Z, g- {& F. q stop( z1 `$ z2 p" Z% H8 F" I% n6 H
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3 A' I5 i: g8 m# T. V ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& i: L" G( n5 T4 k5 J6 y crt num-cars. t4 ^+ z5 C: c( g! @* j5 E
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, l8 t5 @; w g: u2 N( Y1 I; f setup-cars* Q) O$ M8 |$ O5 u2 C
set-car-color; ~! \8 R v6 q
record-data
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. e% E4 [* g) W( G7 [" a0 O ;; give the turtles an initial speed" J' s. r y$ y3 Z- V
ask turtles [ set-car-speed ]
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" y5 @8 t5 p8 V2 I% d reset-ticks6 I; k" U+ X, d* n" u
end
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;; Initialize the global variables to appropriate values9 P7 ^2 u8 y: b- U6 R$ ~# \6 p
to setup-globals
% v0 A" G1 _& p/ E% D2 k! l$ L" N set current-light nobody ;; just for now, since there are no lights yet4 i, b4 z. ?6 D2 n E$ h
set phase 03 r y g9 n3 n( j/ Q) k( ]
set num-cars-stopped 0
{! r7 ]5 C% h, j1 o set grid-x-inc world-width / grid-size-x& W5 O- g5 j0 a; J9 b! c% H
set grid-y-inc world-height / grid-size-y
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h, _# P6 M9 A5 C7 l3 f) G ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
4 I% L! O- n: b* g set acceleration 0.099
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, [( t* |% m( u% K7 |;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 \- H3 Z; e: \
;; and initialize the traffic lights to one setting1 j2 o& @, M. m, T; G
to setup-patches
9 }- W8 D8 ?+ h/ D ;; initialize the patch-owned variables and color the patches to a base-color
/ o7 O4 z* r6 y( H1 v# p ask patches- n ?/ i. r( h3 h/ C$ Q
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set intersection? false* Y& ~+ ~5 C' ^. ^# v
set auto? false- o$ @, K# `' n& Q, b; F c$ c
set green-light-up? true3 t4 a1 X1 ?( a( s( I# e! w( e
set my-row -1: I6 i5 s4 k7 I& m& i5 ~% P O0 S
set my-column -1/ o" \4 V; T! r
set my-phase -19 Q! w& ]8 ~6 z, c) S6 L3 w, s' E/ F
set pcolor brown + 34 \; m1 C0 ]3 F% [# _
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& I/ b' z! l6 v ;; initialize the global variables that hold patch agentsets' @0 x9 K+ R" i4 }
set roads patches with9 Z& g$ L1 G: w7 p5 w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 r) w& o! M9 R8 U F& d& ]/ }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 h6 l2 x6 \) w8 ^+ q f
set intersections roads with
1 p4 n/ M( T# b, @6 m* ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 e H+ _+ ]7 o L/ ? (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 O6 f2 g! B6 Q4 a/ k& U6 b1 I
- c- b, }! f% X& _2 Z$ P ask roads [ set pcolor white ]* n: i; J V( {+ u
setup-intersections
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& P) `7 @3 W! g7 ^; }9 Z7 p& L其中定义道路的句子,如下所示,是什么意思啊?
+ P- p: F" g3 I3 Z( E set roads patches with ^8 y1 O K( u7 g. f' Z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 C2 y! c( V2 v1 V (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! G3 D; \0 j. `# q0 s# H
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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