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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。* U( F4 Z: E* W' o& ~) g" S" R2 [
netlogo自带的social science--traffic grid这一例子当中,) Y! ], f' [' f' I2 [
globals, c# e/ Y& ]/ u# V' x8 r9 ]2 o0 m+ N0 K
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grid-x-inc ;; the amount of patches in between two roads in the x direction
+ c% A+ Z& a9 Y: t6 I1 [ grid-y-inc ;; the amount of patches in between two roads in the y direction. W, B% t9 H4 f6 ?
acceleration ;; the constant that controls how much a car speeds up or slows down by if4 Y/ y( N* `& W5 D4 _5 Q( i
;; it is to accelerate or decelerate
6 [6 [3 K7 D' [6 O9 C3 _! `1 ` phase ;; keeps track of the phase
+ d% b Q" c2 U9 L9 E num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
8 {8 p" ~ t" A6 E' [ current-light ;; the currently selected light, l" m" x- B! L7 a* s( \& k
, m% d/ E3 A; T6 O ;; patch agentsets
! u5 |/ W' \, q) x1 ]9 }$ |9 N* l intersections ;; agentset containing the patches that are intersections+ X7 u/ h. p6 _( e9 w
roads ;; agentset containing the patches that are roads' R; D' f% d5 D
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turtles-own
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speed ;; the speed of the turtle3 n! z( W" c& X+ I9 c
up-car? ;; true if the turtle moves downwards and false if it moves to the right2 T: k/ Y1 E' _. a& F) P+ A% @
wait-time ;; the amount of time since the last time a turtle has moved. O3 o' Y) K% N* ^6 l) f* J8 d5 z
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4 {2 b1 A7 B. ~4 Y, h+ Jpatches-own
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4 ]6 {% D3 w- M. t1 D intersection? ;; true if the patch is at the intersection of two roads" J( T: l/ ^& b: B$ @5 ^- q
green-light-up? ;; true if the green light is above the intersection. otherwise, false.. L7 c8 R) P% e! u, p+ \. ]
;; false for a non-intersection patches.
4 U2 O; w" I: [! ]! D' o my-row ;; the row of the intersection counting from the upper left corner of the
9 R3 J8 Q* N6 S ;; world. -1 for non-intersection patches.4 m( J% _/ p5 v0 \) {9 i
my-column ;; the column of the intersection counting from the upper left corner of the- i8 v, a: A3 l' s; y# m; {
;; world. -1 for non-intersection patches.7 O1 O' F7 I! \" K0 T
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
; a% s/ {# W# w# @: ?1 t+ D% {1 ~& k auto? ;; whether or not this intersection will switch automatically.5 |$ o0 L6 \5 E6 d
;; false for non-intersection patches.& m. Y7 t% I0 ~3 f5 F1 f! g3 B# `6 V
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;;;;;;;;;;;;;;;;;;;;;;& s3 p5 A# g$ G& A9 K& w: U
;; Setup Procedures ;;
0 h6 b; T+ y. t& E* n) k* t0 B;;;;;;;;;;;;;;;;;;;;;;
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' R6 ~4 w& b: W* N# Z+ R) |9 s;; Initialize the display by giving the global and patch variables initial values.
+ Y. V) [3 Z7 U7 U4 N0 k9 T5 k;; Create num-cars of turtles if there are enough road patches for one turtle to
) n5 w6 S) E/ ]' N# P;; be created per road patch. Set up the plots.
( u3 [' _. c- R6 X6 v0 Fto setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
; Y. o e0 h5 [" ~ setup-patches/ o+ ?, X5 y6 L
make-current one-of intersections$ I9 o8 Q. x/ q: V6 s/ W8 q
label-current
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" W4 z" v6 A7 }: B( l set-default-shape turtles "car"
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J) ~) A- J+ D if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
! t! n$ ~6 Y9 R" l+ q6 ? "road. Either increase the amount of roads "
$ K3 ~1 J- Y+ Y9 U "by increasing the GRID-SIZE-X or "2 ?! |6 f. x& M$ z2 d. b7 S
"GRID-SIZE-Y sliders, or decrease the "5 z/ b% {0 Z3 M, S' l1 y! t
"number of cars by lowering the NUMBER slider.\n"- a* r) w3 U4 Q5 D6 b) }* m) L1 ~8 K
"The setup has stopped.")
1 s: s- g; K, V! {- B2 Y stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 A1 v1 p: g* }( J; I0 T
crt num-cars. T5 T8 Q }- h% S) N o! K L
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: G8 J% `& U3 H# H setup-cars
1 W1 f6 p% n2 u6 i' n/ }. L2 t set-car-color* C+ P# o% t' _/ A% }
record-data0 Z$ ?4 `6 r1 s" _, `+ o
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;; give the turtles an initial speed
5 L2 b4 v% m% r. W! V ask turtles [ set-car-speed ]) U+ R; j0 Z; S0 e! ]9 Q
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reset-ticks$ k: c/ ]7 _1 r. u- D
end; b/ z6 A3 `$ j) q7 j7 f$ n
. `3 v8 P- Q* k! s;; Initialize the global variables to appropriate values; I q1 Q: t8 f
to setup-globals9 }5 L- q9 B/ l# ]! d2 r( L; a
set current-light nobody ;; just for now, since there are no lights yet/ c4 E& \, c0 E! Y! U3 U
set phase 0
2 X' L) q, ~& p* T/ S set num-cars-stopped 0- M( S3 f( Y0 v
set grid-x-inc world-width / grid-size-x
J& g U! k! W' F2 p5 M5 Z* b: t& P set grid-y-inc world-height / grid-size-y
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( b5 j2 j6 y8 T ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary5 |) {6 o( I8 H# ]: l7 M! @/ a
set acceleration 0.099( N# W! Y- Y' ~0 c7 ]
end( Z# w( H0 R; }+ X
8 n, D! E' r+ S+ ^$ V2 e;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% E$ V9 M' B9 O# k& W8 E
;; and initialize the traffic lights to one setting
. G4 }8 \- j( \" L% A. K- w3 Zto setup-patches3 v# F9 _+ I4 a4 ~5 U
;; initialize the patch-owned variables and color the patches to a base-color: W7 v7 I/ B; \0 E. ^0 v
ask patches
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set intersection? false( N' q1 ]/ D8 t# ^
set auto? false" b2 \; y. b; S5 X
set green-light-up? true
: K5 U2 d0 F0 K/ A set my-row -1/ o' l1 H8 w# s# u' }2 L$ Y) u; D' V
set my-column -1
9 L6 b8 O6 y5 N C$ @0 a set my-phase -18 @; k% D8 w E
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets. B' \* J$ O1 h5 O3 R
set roads patches with
" h1 I5 N" d7 D# ]" ` [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 c5 ~% H% ~& x0 |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! L- i9 l2 ~8 |0 j. D0 i. c set intersections roads with
v. P/ [8 H) S3 z% ` [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* H& }: X3 f4 H4 b6 T- o: U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* w3 k5 ?) o/ i2 r3 Q; D
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ask roads [ set pcolor white ]* r1 P. B7 ]# D% Q; O; G3 k8 g
setup-intersections1 i% C0 r" H4 _. }- v
end
# [- E" F. |9 \ }, b7 c( p% w其中定义道路的句子,如下所示,是什么意思啊?
/ s2 h3 V% {9 t) { set roads patches with
$ c! K9 `+ R: } [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: O' ~+ |+ W* ?, N (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, O$ j: Q- S9 w2 {0 @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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