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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 M+ T# m) l- A9 `
netlogo自带的social science--traffic grid这一例子当中,
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grid-x-inc ;; the amount of patches in between two roads in the x direction
9 f7 \( `- G4 r8 F5 P grid-y-inc ;; the amount of patches in between two roads in the y direction$ Z4 K! k" ]& g1 y" G6 X
acceleration ;; the constant that controls how much a car speeds up or slows down by if' d0 o/ F+ t1 H$ R+ r
;; it is to accelerate or decelerate
5 P( d; j) }5 m4 ]! [ phase ;; keeps track of the phase
* V" E; [/ Y! e: v0 H. D! Z num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure. Y$ T: e$ b5 {
current-light ;; the currently selected light
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;; patch agentsets
- ^4 D1 U; q7 E5 ` intersections ;; agentset containing the patches that are intersections2 r' R/ G" k. u' t9 N( q/ k! |
roads ;; agentset containing the patches that are roads1 B# f; T# U; T9 _/ C2 w
]
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* G" D! e0 P/ l& mturtles-own5 P# E4 ^$ k! k& c# n- h+ }
[
6 X& c/ W d, H$ J1 m9 V9 B speed ;; the speed of the turtle
. u+ N! [$ q. R: }, A2 G. K1 j up-car? ;; true if the turtle moves downwards and false if it moves to the right/ V* l( o% {( D3 B5 |. ~6 r
wait-time ;; the amount of time since the last time a turtle has moved# ?/ j/ M W. Z% J4 a
]
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patches-own/ o# U: g" E# F( N N. Y9 u1 c- \6 k
[
% z: \5 U6 H! [7 e0 b$ @5 g! Q9 P+ W5 E intersection? ;; true if the patch is at the intersection of two roads4 D# k# a2 `. C: n) E5 F* K4 S
green-light-up? ;; true if the green light is above the intersection. otherwise, false.2 s8 \; A3 L! w5 j6 n) _
;; false for a non-intersection patches.
5 ^) W7 z: D. s+ k my-row ;; the row of the intersection counting from the upper left corner of the
* \( j, S. h8 Z. W ;; world. -1 for non-intersection patches.
* s9 k1 ~4 J: {0 N my-column ;; the column of the intersection counting from the upper left corner of the" v6 M2 ^ G z" {8 `/ F
;; world. -1 for non-intersection patches./ z, }& X7 N# E, C" u
my-phase ;; the phase for the intersection. -1 for non-intersection patches.6 `; R9 Q) R$ m4 r; B! v% J
auto? ;; whether or not this intersection will switch automatically.# S# l1 t$ O8 i$ W9 a* S5 s1 q
;; false for non-intersection patches.
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8 h, m3 m' M( m' q1 l. ];;;;;;;;;;;;;;;;;;;;;;# V7 x4 R% X9 Q+ R& M
;; Setup Procedures ;;) I2 u2 @+ R9 g
;;;;;;;;;;;;;;;;;;;;;;$ H0 ?: [' Z9 R ^/ D
* C! P0 N: F+ ?;; Initialize the display by giving the global and patch variables initial values.
) M0 o" H& k0 _6 J) T! Q! h;; Create num-cars of turtles if there are enough road patches for one turtle to" L6 V0 g( G% S; g( w4 s
;; be created per road patch. Set up the plots.
6 w$ r) k% Q4 W" K( r p" w" jto setup
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setup-globals6 z+ @! }2 R+ I
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;; First we ask the patches to draw themselves and set up a few variables
! d8 w; r7 o) U" e- h' |+ R setup-patches
! t6 e$ d. ^ i) K4 x! e make-current one-of intersections
8 O+ o) Z# Y- n: n/ A label-current/ P, N/ ~) W9 l
4 X; s# }0 h- i, J9 ?, } set-default-shape turtles "car"
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6 Y2 W$ v: t- v+ z6 Z9 I, N# ?0 J if (num-cars > count roads) q$ K/ k: f9 b. E+ l; S, y7 w
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user-message (word "There are too many cars for the amount of ": ], e2 H( K/ ?2 k* u, R
"road. Either increase the amount of roads "5 T3 t( L* \, i i/ W9 W2 {, Y; D
"by increasing the GRID-SIZE-X or "
% k# Y+ l! D6 K- v5 X L8 n' \8 w "GRID-SIZE-Y sliders, or decrease the "
! ~3 b0 N' f) Q "number of cars by lowering the NUMBER slider.\n"4 G5 ~) q, b7 I/ N$ `
"The setup has stopped.")- z" S8 v" J3 [
stop4 M, D( b* D3 l' z k9 S4 O; G5 T
]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% ?. g2 ?8 h6 }7 `6 @ crt num-cars
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3 q/ Q# q; {& M8 \3 p setup-cars
' X6 F# L% A9 f, u0 l: U. e/ R+ [7 N set-car-color
6 {) \4 Y* d( X( @, X# h record-data
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3 i% ~4 |1 \8 t$ A% w- E ;; give the turtles an initial speed5 t1 s, ]; U% q; l0 M* P7 `) }. _
ask turtles [ set-car-speed ]
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5 S+ U, r- C! |. E+ | reset-ticks
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- R. `! y. r) R: R. C;; Initialize the global variables to appropriate values- K( h" _& {: m: J& K/ \; ~
to setup-globals
2 {- c3 e+ c+ g! L# q; s, F4 `, L9 w set current-light nobody ;; just for now, since there are no lights yet% [: U4 c- H9 f6 a1 K
set phase 0
% h. P6 y+ A8 `( n/ @8 v* Y set num-cars-stopped 0
N" d, T4 E8 h set grid-x-inc world-width / grid-size-x z: C% L: b2 {) S; D4 c |& ^
set grid-y-inc world-height / grid-size-y( W2 F2 ]: N; Y
- J2 p8 W; D$ j* d) Q ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' A6 d( ~" O; I
set acceleration 0.099$ A A- x5 y$ B; F5 I g. v
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# c3 R; @$ }% }' r2 ^, w$ v" j1 x;; and initialize the traffic lights to one setting' n" C7 W; e- J# i9 b
to setup-patches6 ^; W. k$ t- q
;; initialize the patch-owned variables and color the patches to a base-color+ S! s; ^. D/ ]8 Z' a, @
ask patches
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set intersection? false5 t' t) ~0 t8 U# C9 |; L# S2 o
set auto? false
, f6 ?! P; V2 {$ F4 S _2 H set green-light-up? true
+ ~% ~& N0 N. l2 a9 g- R set my-row -1* i- j7 z5 {& f- l
set my-column -1
2 s5 g/ y$ [; a4 P U( o set my-phase -1
; k3 r5 \: o/ x/ l. G. t* n set pcolor brown + 3/ P; i, O1 \; E9 I/ g P6 F% Q, g
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;; initialize the global variables that hold patch agentsets# ~7 E) r Q% C
set roads patches with
% i, r. H- |' g3 J: F [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ N; O7 |, Z4 i) F x2 ^( D! v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 i7 [$ l' z4 @ set intersections roads with
: r- c1 u& n& b* F T+ T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. @) U3 y* L3 |0 L |1 f) o3 ?% o
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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' y8 o* Z& O' R9 X5 { ask roads [ set pcolor white ]. l0 w. j/ [3 [" A' Q1 ~) l: w% t+ E
setup-intersections- |2 S* h6 [& A7 w J. q
end
7 _# l% W3 Y- v1 B+ @5 G其中定义道路的句子,如下所示,是什么意思啊?
# W' _0 |+ m W9 g" }7 p# |4 T set roads patches with/ i$ m& i9 h. F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* e# s' m) L k" ` \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" p) A9 X# u" p K
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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