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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。
& h5 X5 z* f4 ?netlogo自带的social science--traffic grid这一例子当中,2 M& \) b, Y( Q* z. a5 p
globals R, m5 E3 j" }
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grid-x-inc ;; the amount of patches in between two roads in the x direction% y/ v% m: e1 [$ h, D
grid-y-inc ;; the amount of patches in between two roads in the y direction
, G: R1 ]. ?8 ^ acceleration ;; the constant that controls how much a car speeds up or slows down by if6 w$ s, Z8 \8 \9 \1 L8 v- Z* }
;; it is to accelerate or decelerate
" O0 ^' x) P7 ]1 v1 p: g phase ;; keeps track of the phase
0 h1 @8 j- H2 J3 q+ |. V# p num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure O/ r! L; G4 y$ n) m! z
current-light ;; the currently selected light
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;; patch agentsets0 ^/ q; H- Z, y- ^( [# F0 z
intersections ;; agentset containing the patches that are intersections
! C) V2 H o) I& h4 A3 f roads ;; agentset containing the patches that are roads
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' Q- N; l) h+ b1 Tturtles-own: j+ D3 ?9 T6 b1 X1 d: L0 o" p7 }! G
[
8 A% V& F3 Z7 P2 d- F6 _8 z& X! T speed ;; the speed of the turtle$ Q1 e9 t$ }3 T1 h
up-car? ;; true if the turtle moves downwards and false if it moves to the right6 H) N6 ^8 i( C7 p4 [# H2 A5 F
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own- W4 v+ F! y' ?- E" |0 E4 l8 H
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d/ q, q M- R+ Z& [4 S2 g intersection? ;; true if the patch is at the intersection of two roads/ K. F, b# E% n7 {- u9 J
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
4 z0 e3 V. L( d9 d W3 z5 z ;; false for a non-intersection patches.
( M* }5 V6 v9 c6 A7 v0 e my-row ;; the row of the intersection counting from the upper left corner of the- {* E/ J1 W: N
;; world. -1 for non-intersection patches.
& @6 B) g( @ z% _% Q6 s4 N my-column ;; the column of the intersection counting from the upper left corner of the/ J! g) X! ~; o" C, N
;; world. -1 for non-intersection patches., }4 I: \7 i7 J, w5 g1 O( M
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. M p2 x& [# h# w' j0 i w auto? ;; whether or not this intersection will switch automatically.9 W% K/ w6 {) b! Q3 A' D
;; false for non-intersection patches.
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3 \9 W+ K4 g0 E- G# @9 f4 s;;;;;;;;;;;;;;;;;;;;;;- @; j! \- r/ c4 E! N! A5 _& N# [: |4 Q
;; Setup Procedures ;;
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! h/ V' w6 f* n' @$ @2 @# e2 d;; Initialize the display by giving the global and patch variables initial values.
' m3 j; X/ D, v/ ]" `, b7 Q;; Create num-cars of turtles if there are enough road patches for one turtle to1 p8 n% c. l: q0 j1 w; C" ~
;; be created per road patch. Set up the plots.0 p' V9 j3 C `; O! v+ x4 n( E5 t' R
to setup: ^- |" M: W+ b" |
ca
! p6 Z& U, ?2 |$ y setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
& P6 M, t( U( n# C# U8 q setup-patches
3 {8 H! E9 j# H+ I: p1 ~ make-current one-of intersections
Z9 h5 [* {0 ^ label-current4 `3 J( f o; Z$ G$ j" b
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set-default-shape turtles "car"
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2 [( t8 Q3 n4 v! G4 ^# m$ W, P if (num-cars > count roads)
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' k; N! R$ w( m$ U$ V& H user-message (word "There are too many cars for the amount of "
, l1 [( a% R9 l$ q) Y+ A, C1 e "road. Either increase the amount of roads "! _8 r" ?- ^: x1 ?1 G0 r8 ~2 H
"by increasing the GRID-SIZE-X or ". D( V- V$ J; a8 G
"GRID-SIZE-Y sliders, or decrease the "
1 D* H+ G. k6 ~3 S "number of cars by lowering the NUMBER slider.\n"
% m- N& Q1 q& ?1 A" X$ w& C "The setup has stopped.")
, x$ E7 Y, {" V8 V& t9 x stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 N. [) _; ]' Y5 ^! y$ E( K
crt num-cars
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setup-cars
8 {; B$ }* | L+ |5 |" x2 W set-car-color
. M+ Q- y+ E r4 i8 g record-data# J" G l* \' Y9 @& N9 Z2 l: N( ]" h: l
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;; give the turtles an initial speed
" V, H6 v) ]1 }- O; c ask turtles [ set-car-speed ]! D- O/ w4 Z, o; ~
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reset-ticks
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;; Initialize the global variables to appropriate values
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0 t2 \9 z8 a4 }0 g# x$ Y. u set current-light nobody ;; just for now, since there are no lights yet
; _4 w7 i/ Z4 x set phase 0
2 c! ?: ?% [. {3 G set num-cars-stopped 0
6 U6 o8 J4 `" z9 E2 i1 F set grid-x-inc world-width / grid-size-x
+ R: R/ c; \" G. M; \ set grid-y-inc world-height / grid-size-y' b3 M$ l) ~ s* k9 R2 C7 i
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ l" z" x" G! c" }; h" D! f- [; g set acceleration 0.099
; w; J; b3 V8 W9 aend
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/ d4 S6 P8 _3 _8 f0 R6 O8 p' U/ s;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
N W3 Q2 f0 F5 t3 \. v) X6 e;; and initialize the traffic lights to one setting
/ c0 d9 m7 ^# o' W0 Tto setup-patches
" Y- c0 x& |4 r ;; initialize the patch-owned variables and color the patches to a base-color6 L$ g4 f+ [) Q5 G+ h8 w8 c
ask patches
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set intersection? false: `* f# X3 t# {- W
set auto? false9 A! ~3 E. R9 _7 N
set green-light-up? true
5 C# N; D$ q- {& l9 n set my-row -19 t t5 }# C0 O/ E9 X
set my-column -1
U$ u5 K, M# D" f* ? set my-phase -17 E: J) O( x% t$ P
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
+ ]0 d7 M! J k9 V set roads patches with
2 H0 A2 F" m1 Y! R6 ?& I$ V [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; y8 @% w3 _" u+ m' ?$ ?$ S" @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 P/ C" F( o9 P' [ v0 z4 {' P! x, \
set intersections roads with
2 L, _2 y0 u5 {3 q5 \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' X( N, ~5 f1 R. s* }% a e+ B7 O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
+ ^8 R) c) W& x3 ?6 Y& i6 d 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?& K9 q3 B0 H3 t4 E0 F; ^$ C
set roads patches with3 d* \* C$ ]/ i" ^& ]4 ^, | o, u0 Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ K* e) p$ D9 H5 v9 g* z2 T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; B, ?6 @" e1 Q
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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