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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 W, @ x Z
netlogo自带的social science--traffic grid这一例子当中,
+ P2 \/ b* B+ ?; P+ A; y6 mglobals
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' a. v* i$ V4 \7 v9 Z& U. A grid-x-inc ;; the amount of patches in between two roads in the x direction
) p* \3 A6 W/ A: \5 S grid-y-inc ;; the amount of patches in between two roads in the y direction( W! F+ w5 s2 p5 ?* U- I
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 E/ T* U# y0 \3 {$ j6 c ;; it is to accelerate or decelerate
; t* |$ X, \8 L/ N; n: n' ?3 n phase ;; keeps track of the phase! ]9 r- c# S; p; @- G: ?
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure$ L$ \: _* X1 Z3 i6 c
current-light ;; the currently selected light2 G4 Z+ K3 Q- t D
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;; patch agentsets
6 o& R1 Q* Y% E/ e intersections ;; agentset containing the patches that are intersections# B- k2 y1 R/ M% k" A3 _+ [1 b; ]
roads ;; agentset containing the patches that are roads
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" C6 Z4 w, y6 v( v, G! n3 u( Oturtles-own# [3 C, A2 O$ u4 d$ t# z6 V
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speed ;; the speed of the turtle; t% [; p& Q w2 E4 h
up-car? ;; true if the turtle moves downwards and false if it moves to the right" h; l6 ]) `/ `
wait-time ;; the amount of time since the last time a turtle has moved& b9 F8 W+ R3 o3 l
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* o6 _9 P$ B, i: e- f/ epatches-own. F4 q: E# F% d" [ F9 n9 Z/ j
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" e/ G# R* m* h& q intersection? ;; true if the patch is at the intersection of two roads
2 G1 M! {- ]* ~6 H! M* j green-light-up? ;; true if the green light is above the intersection. otherwise, false.' r% K$ N( c0 U, C. o/ u
;; false for a non-intersection patches.7 l9 N+ l9 l( o4 j2 p; u
my-row ;; the row of the intersection counting from the upper left corner of the
& Q1 f; {* N- C+ F ;; world. -1 for non-intersection patches.5 `9 W+ w. E; i1 b% f$ u9 L
my-column ;; the column of the intersection counting from the upper left corner of the) U! U6 J9 o) U! E$ [
;; world. -1 for non-intersection patches., R" b. w; T; @2 _
my-phase ;; the phase for the intersection. -1 for non-intersection patches.8 V3 s( E9 |" n% _, y
auto? ;; whether or not this intersection will switch automatically.
% R1 j& T2 r5 s) F ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;+ Z. }) ^* w+ X+ p) ^# u# j
;; Setup Procedures ;;- V7 ^& L8 r6 F
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;; Initialize the display by giving the global and patch variables initial values.5 @5 _ d( {& c' M" U7 j
;; Create num-cars of turtles if there are enough road patches for one turtle to
8 a; A/ z! S- W* y5 E;; be created per road patch. Set up the plots.
: q' }7 Y2 Q4 R: `$ J' e# pto setup
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: q2 r, b' Q' l) \2 }, Q! _) `8 Q setup-globals, Z: p; a$ V! J- ?
& p5 C* o* T* s4 `% q ;; First we ask the patches to draw themselves and set up a few variables
% R. ~+ R, T4 I% L! h setup-patches
/ S- b2 k5 M0 ~2 n make-current one-of intersections% V$ i( V" W C
label-current
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8 o9 F: M6 t: Q( y! D A- G set-default-shape turtles "car"
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if (num-cars > count roads)
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! V" E0 }7 w% |# Z3 I" r user-message (word "There are too many cars for the amount of "
4 y& G1 \9 n" l8 O( y# z1 Y) N "road. Either increase the amount of roads "
+ F! H+ E+ M1 O) _ "by increasing the GRID-SIZE-X or " f4 z* D' Y' }# S6 h: ?
"GRID-SIZE-Y sliders, or decrease the ": O9 X! W. V! r; w& h2 n1 }3 |7 O# M
"number of cars by lowering the NUMBER slider.\n"
8 ]1 x6 A' M# K( O "The setup has stopped.")6 a% [7 U' H; T0 y W3 x0 _
stop9 A# b# w4 U; z, w4 R+ @( ~6 v2 u2 m
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4 ~+ U0 R" B' I! Q ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
0 h7 s0 v3 @2 r w: F2 L crt num-cars
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" g! q! j1 b8 |1 o c k8 l setup-cars
" K8 G: W0 G: v0 F) N set-car-color
+ ~. c/ h3 l0 E2 z: d4 E record-data5 Q8 z8 |2 y! `7 J8 _+ c
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;; give the turtles an initial speed- n9 [# ^$ b4 ]3 h8 q
ask turtles [ set-car-speed ]
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reset-ticks
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1 z4 N# Q$ `$ `4 k7 [;; Initialize the global variables to appropriate values
9 N9 p- E7 N+ z! kto setup-globals
# C$ S! j% B$ ^0 g set current-light nobody ;; just for now, since there are no lights yet. O2 d- S. J- u2 y1 D
set phase 01 t1 ^! m( J# o# _/ `. e d( l
set num-cars-stopped 0$ r' R" J5 X7 g; i: I! p5 ^, f" x
set grid-x-inc world-width / grid-size-x
# D5 ^" w# v" I1 {( e# k5 r! x set grid-y-inc world-height / grid-size-y
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. O! d6 F# c& p5 |1 N! z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ \* l* L& S( ?3 Q
set acceleration 0.099) k% k1 [ U. s; X& V
end1 b2 q" l, z( t8 t! j5 l0 Y4 f8 u
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& W o( d0 t# \9 h. }2 b
;; and initialize the traffic lights to one setting3 W5 I" D8 M9 o# X+ m4 `& Y
to setup-patches
' s7 d7 G, l$ l4 }% r/ f5 n8 g+ M# M ;; initialize the patch-owned variables and color the patches to a base-color8 t: r$ B+ |3 B1 b
ask patches; w |+ F: c( L7 X) C, j' {
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# Q, o- F) ] w6 b set intersection? false/ h6 r9 v4 L, C
set auto? false
4 v9 m$ L: j: \5 Y7 G. Q/ { set green-light-up? true
/ x# _( ^: W3 |' e+ L set my-row -1) U+ T/ o& g N1 m6 j
set my-column -1
. f; q7 w- m. i set my-phase -1 T( k7 H5 x: R& @* x. ^: j. r1 {
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets$ J9 G0 H3 x: l
set roads patches with
1 f7 m% X ]- r [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 |- g2 S0 v& f0 m: H# C y7 A (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 f2 ~, Q5 J( i* _0 L" j set intersections roads with
( O( c7 m8 _/ P W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ ?$ p4 c6 l2 M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 C! Z& s& A/ T
' O% ~$ p* w5 o5 K. A6 i/ D ask roads [ set pcolor white ]" G0 i- F8 K( U8 @! X
setup-intersections' L& o# E8 O6 \( u( G& ~( L
end
# l* L2 h7 j' s3 l% H其中定义道路的句子,如下所示,是什么意思啊?- X' I. Z, p. |8 Q& c% r+ Q$ e. q
set roads patches with! q2 r% i6 v/ V' E1 K v# b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 F4 O( d, O2 |; ~0 c (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% E; y# ^/ {: p1 G' c* y
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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