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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。3 z) i; _3 ^1 m6 e8 b" W
netlogo自带的social science--traffic grid这一例子当中,; h7 w% Y4 j4 v9 p
globals) ]# w( l: W+ g' i" s
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grid-x-inc ;; the amount of patches in between two roads in the x direction
- U5 f) ]+ q' [% v: S9 Y grid-y-inc ;; the amount of patches in between two roads in the y direction- K P: K5 y% w9 w- g+ `
acceleration ;; the constant that controls how much a car speeds up or slows down by if
7 P4 D* \! s& Q/ V1 r4 m9 y; Z' ?, r ;; it is to accelerate or decelerate- N6 R$ a2 q! d& y
phase ;; keeps track of the phase* d2 Q! i! q' H: y% t
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
7 h+ ~- D& n" d# d$ X current-light ;; the currently selected light
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;; patch agentsets
* N3 R# i- o m6 i8 l intersections ;; agentset containing the patches that are intersections
1 J3 }- m; g) S) [# K roads ;; agentset containing the patches that are roads
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; v$ h9 d' c. Z& d' o& S* Eturtles-own
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speed ;; the speed of the turtle* b0 d3 i8 d! h5 {" }& ^3 w6 z
up-car? ;; true if the turtle moves downwards and false if it moves to the right2 E2 Q p- i* T
wait-time ;; the amount of time since the last time a turtle has moved
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6 h9 j: _3 E- M5 qpatches-own7 I# W0 q" m* R( S. u+ [
[
) B1 ]3 p' H2 h! E+ { intersection? ;; true if the patch is at the intersection of two roads" T% B1 a9 g, G9 h7 `4 O! y0 B" g
green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 A7 u8 B5 l" G( j8 D
;; false for a non-intersection patches.% t8 D4 K, n& Z. J6 n
my-row ;; the row of the intersection counting from the upper left corner of the& m5 L n' G: O2 ~- g
;; world. -1 for non-intersection patches.
- p \! F2 o* A; I my-column ;; the column of the intersection counting from the upper left corner of the9 ~: n `) ~, A$ H& ?) U7 d0 g
;; world. -1 for non-intersection patches., p& d; o; [' }% U. [
my-phase ;; the phase for the intersection. -1 for non-intersection patches.& Q+ L; N& s; q! b( w. W
auto? ;; whether or not this intersection will switch automatically.& |2 N l3 Q: D% M
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;3 S# S# t( W+ y, r4 T e
;; Setup Procedures ;; Q* j8 C/ z2 K8 [
;;;;;;;;;;;;;;;;;;;;;;
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" `( h( o6 Z* H/ H;; Initialize the display by giving the global and patch variables initial values.
4 l7 B( z! i2 p' f1 {9 j7 E4 o! w+ w;; Create num-cars of turtles if there are enough road patches for one turtle to
( I" ^5 n$ J8 K' b0 O, r; `;; be created per road patch. Set up the plots.
) @3 h* G/ a! F$ h3 i0 q5 |to setup
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setup-globals9 m. O: }' x5 |1 `, D; ]
6 d9 ~2 K( W1 u! e" L5 A9 u; T ;; First we ask the patches to draw themselves and set up a few variables
5 Q8 }: l( h! L7 P; A: Y setup-patches
- j) {5 ~4 R3 Y: T: S [ X; J# R make-current one-of intersections }+ _$ ?' d4 M$ C& y
label-current7 ~( i% G* ]0 B4 Q5 w; l; x- E
7 m9 t& ~8 ~) w7 @4 x set-default-shape turtles "car"
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a% f$ `2 r2 ?$ A if (num-cars > count roads) s5 r. X' u# {& p: z
[
R2 K/ D" _* X user-message (word "There are too many cars for the amount of "3 h: L, v4 M p2 r
"road. Either increase the amount of roads "
! K) |/ B }* J1 p5 Z: U9 g& j "by increasing the GRID-SIZE-X or "
. z2 E6 ?$ [3 O "GRID-SIZE-Y sliders, or decrease the "& ?: O0 q9 _% M) m4 S, g& k# l# m
"number of cars by lowering the NUMBER slider.\n"
G7 [5 \7 _% Y- v "The setup has stopped.")2 P+ i! }/ ^1 u5 b& Z
stop
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1 i' \7 N2 k7 N/ [( E ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 ^: ~. Z/ K F+ N
crt num-cars+ C6 o" p( Y+ A; f# v
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: f6 B) K, c7 _/ a setup-cars
1 I9 Q; ^! v! o+ Y set-car-color
1 r. U& {2 v& z2 H7 l record-data9 x8 C: l. Z9 ?& b. j8 o6 W) o( }- e5 ?
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;; give the turtles an initial speed
& i9 w% E: A$ `* n- o# F# l3 i1 S ask turtles [ set-car-speed ]7 z* c+ |8 K) ]) U
% P7 h2 G) L8 b0 m( X! N reset-ticks
+ x- R3 [6 h8 y7 V% [( Cend
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;; Initialize the global variables to appropriate values* U! o9 A9 [& E8 o5 H3 y; r
to setup-globals( ]1 f6 I# A# R" H6 [
set current-light nobody ;; just for now, since there are no lights yet3 C2 ^2 K, v) A; ?
set phase 0
- f _5 b( X5 }4 j# o. L% j, }, n" ] set num-cars-stopped 05 _: @4 ]/ X+ E% }: |
set grid-x-inc world-width / grid-size-x' }, q9 ]& Y: U' c# ^$ {
set grid-y-inc world-height / grid-size-y2 }& d/ X9 W- T5 X J% K
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 y. g* p. r; Y# e& {) I
set acceleration 0.099% f$ G* p" M+ @5 ^$ G
end6 f9 T. @' {0 s7 |5 @+ H
0 k/ H7 G& E. u- O, };; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 R5 {) p! u# ?( M! x l* ~& {6 J;; and initialize the traffic lights to one setting7 D- a8 @% ^6 V
to setup-patches
! ^5 L5 @. f/ A2 E X, V ;; initialize the patch-owned variables and color the patches to a base-color# P# K7 A" a* y, J
ask patches7 M4 N- \, @ p/ E' c" x& n8 o
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- q& T8 {8 E, W' g set intersection? false
5 G% X |7 C* M+ r7 L+ R$ L set auto? false8 N" I) a( n; i9 }. o
set green-light-up? true
% ], M4 x% q' | set my-row -1
3 W/ L9 P* G1 B4 @- r4 } set my-column -1
( c( e5 | V0 u5 v! N. P; B! c set my-phase -1" i& c: b. s4 l) Q
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets% r4 A. v, s1 v
set roads patches with
1 Y* U! y: [ ~% \( r& f ] [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- Z. t" k# ]4 x; \0 { z4 ?$ z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% k* B6 j: e! h: v( B- I/ u set intersections roads with: A" B% X) b' _( v. [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( D' b# n9 ~# n0 z5 K+ ` (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 Y5 \) o% k7 f# {/ W
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ask roads [ set pcolor white ]
, M( n% }3 y6 {( x v setup-intersections* ]. V4 Q" X) ^4 [. a% `0 W) {
end
+ \' O; p( `+ Y# T7 v |其中定义道路的句子,如下所示,是什么意思啊?
" i: E) |' F- q! h0 c set roads patches with
4 W2 ~/ L( q* A [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; Z; h& h A& k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# n+ h- O1 h& V5 [
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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