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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。1 D: k2 \' H! I+ t8 f0 c
netlogo自带的social science--traffic grid这一例子当中, L3 i! S( @: p$ b
globals" y, z) A# m1 f
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( Y4 R% S: M: o2 m& [' p/ r) V grid-x-inc ;; the amount of patches in between two roads in the x direction
9 f) M3 x# P2 {9 _" Q5 M grid-y-inc ;; the amount of patches in between two roads in the y direction# H) x [4 x- X. l" T1 n
acceleration ;; the constant that controls how much a car speeds up or slows down by if$ c8 o. b" J1 o- H
;; it is to accelerate or decelerate) S9 _7 i( \, E& Y5 e8 F7 l% C
phase ;; keeps track of the phase
1 o6 S9 y5 m3 W7 J3 _ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 v" e1 u) r' K3 E& _
current-light ;; the currently selected light6 m2 b9 s2 r7 B1 b/ J
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;; patch agentsets
3 w6 h9 H' I" b intersections ;; agentset containing the patches that are intersections) @! u0 y; N- l$ M! D
roads ;; agentset containing the patches that are roads
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/ [$ i# N6 ]' g9 ~- ?1 v8 mturtles-own8 A0 j. U" b7 A0 Z; h6 F6 \+ |
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: w1 F: N) _; o" ?. z+ ?2 @9 c speed ;; the speed of the turtle
; {# A5 ^2 R2 P up-car? ;; true if the turtle moves downwards and false if it moves to the right, k) n0 | a" H& E$ j
wait-time ;; the amount of time since the last time a turtle has moved
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5 g _3 E' m% }, H* t8 X c Rpatches-own' Z% R2 N* Y. I, c5 n/ d* F$ {- E: j
[6 X% y5 m1 e0 {
intersection? ;; true if the patch is at the intersection of two roads
" t1 Y; B7 ?! w1 I8 }0 [ green-light-up? ;; true if the green light is above the intersection. otherwise, false.* V# O! i6 _4 Y" E E
;; false for a non-intersection patches.* t, J4 a/ A3 S/ N, h
my-row ;; the row of the intersection counting from the upper left corner of the6 W( }# G5 P! h! d) o* D7 g" S: @
;; world. -1 for non-intersection patches.
) m. d$ U& k; V, ? my-column ;; the column of the intersection counting from the upper left corner of the
" s; X, m, ~4 g/ C4 E ^ ;; world. -1 for non-intersection patches.
- f& H" P6 q8 a3 V! m: R' U7 P* e) A my-phase ;; the phase for the intersection. -1 for non-intersection patches. E* H1 e* s4 \7 ]+ T6 l! ?) R
auto? ;; whether or not this intersection will switch automatically.! i. D, w% U" K! h
;; false for non-intersection patches.1 w9 @- d# X3 C) Y0 Z/ D& s
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;;;;;;;;;;;;;;;;;;;;;;& Z5 {4 d( C: \( I' e
;; Setup Procedures ;;
7 j6 k" e4 {$ r5 w c& v- _% P;;;;;;;;;;;;;;;;;;;;;;& a' ~ `, v) I
! ^, P3 D5 E' i; F' b$ n;; Initialize the display by giving the global and patch variables initial values.
1 h6 I0 b6 ?8 p;; Create num-cars of turtles if there are enough road patches for one turtle to! U) a. U# k v' |% x
;; be created per road patch. Set up the plots.7 K# {( U# s j- _
to setup; P$ }* P) E8 U' l3 d( c
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables' U9 m) r+ K' @+ f: T
setup-patches
/ n0 o3 Q/ P2 X" P N make-current one-of intersections8 y; s2 A4 n4 ~: V
label-current8 K: T( B( J; L1 ]
* E3 W1 A) q, v7 } set-default-shape turtles "car"0 P4 Q" u% _" w& k
' V" z2 c/ P. v. h( _ if (num-cars > count roads)7 E% O9 u/ |0 g% G2 G1 `" }0 }
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9 l: Q6 u6 }& l- ] user-message (word "There are too many cars for the amount of "
8 M( o1 b6 p- Q0 x2 Z2 H "road. Either increase the amount of roads ". h" x, O0 T, Y n. C
"by increasing the GRID-SIZE-X or "
2 O4 E, v' Q% S5 X# u3 A Q- q "GRID-SIZE-Y sliders, or decrease the "2 M4 ^1 J p4 B7 A- r0 B! |7 r
"number of cars by lowering the NUMBER slider.\n". k, A" U% l+ Z9 a" x( o% W
"The setup has stopped.")1 A/ R3 Q" ]; Q5 r
stop: U6 m; U3 B: h' h6 h% \
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! f4 d; R' X# I3 V6 o' U
crt num-cars
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setup-cars0 O4 @! [8 U0 Z8 @$ e+ [
set-car-color" H! I8 E6 m3 {0 L
record-data
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;; give the turtles an initial speed8 y) O/ b7 X$ k# a
ask turtles [ set-car-speed ]
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6 t; l1 ? u3 x' W5 m1 i9 f reset-ticks+ P `, T4 V3 B* Z
end
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;; Initialize the global variables to appropriate values9 a f0 v, v( Y
to setup-globals
9 n: t; k C9 a" r, T0 b; ?& S set current-light nobody ;; just for now, since there are no lights yet0 ?$ p" E% k" A2 }# J
set phase 0
: W6 r5 M; i! q set num-cars-stopped 0! R% U0 O y- N) @6 I+ I. M
set grid-x-inc world-width / grid-size-x
4 o& ^: `8 g6 `: a* A+ e- B set grid-y-inc world-height / grid-size-y
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8 D' g# h+ W9 ]* R+ B ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary% e! L8 h$ C( y. X; F' ^
set acceleration 0.099$ ?3 x( B$ K0 ` t
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 v" P- r, ?6 I7 R
;; and initialize the traffic lights to one setting
7 F4 _5 q) q& Q. Z7 }3 xto setup-patches l$ u( S0 N# y1 v0 d
;; initialize the patch-owned variables and color the patches to a base-color
2 C; j( ]( w! ]2 ~' X4 ?0 } ask patches
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# s3 m* t7 X8 I3 k; r9 N9 `- t& _ set intersection? false* L8 t+ B5 T3 D
set auto? false- b! `& Z& e- z) D
set green-light-up? true
0 O2 A5 z2 ~% Z E1 z& R8 Y k set my-row -1
' `5 G( B' l W* S7 f6 _4 C) W( M' v set my-column -1
" a- U# P- T9 \5 V0 T' ?2 z set my-phase -1
1 Y2 s3 B4 _. l: Z$ ]5 u: I set pcolor brown + 3
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) \# y% B! c4 Z' N ~/ Y ;; initialize the global variables that hold patch agentsets* J% E( l5 `. `" J; u6 j/ _% w
set roads patches with; w% Y( e' ^$ Y6 l* K u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( I8 T3 l" n3 ^! `9 l% A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 @: H3 R0 c& n E1 {2 v* r3 p set intersections roads with
1 r, b" f4 w% Z n8 T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 R5 W7 ]6 p. e( m$ R. g (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 V3 I8 k* R0 X& a- R8 e
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ask roads [ set pcolor white ]" k \8 f g4 v2 n
setup-intersections5 T9 k# Y$ s' X+ m
end
1 Z: U! o4 K" ]2 x其中定义道路的句子,如下所示,是什么意思啊?
5 V$ Q' j( Q7 s. s set roads patches with( S4 L% A4 d6 T2 }( W, h. |6 Z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! I+ }3 U. c5 Q$ a% U, } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 L' W y3 R `9 r7 W d/ l
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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