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想用三角函数拟合一组数据 结果一直报错 感谢大神解答 程序就是源程序clear;* s% o( ~9 n4 R0 s9 d% M! R
theta=linspace(0,rad2deg(2*pi),181);
$ c6 c5 }) N9 ~( w( r8 Hy1=[0.512) b( q% ~+ I$ h1 j4 X" W1 D
0.471/ w$ I& A( v' z" H
0.445
: P9 M3 Z( a( h$ ~2 j$ m2 k* b0.408
1 S4 B" P$ l3 |3 h p0 @' ?& k; X0.382: c7 e% O! Z) C+ B% t0 T
0.347: N. j7 ]6 I, ^
0.33, x: R1 {& x4 ^( A
0.295
6 t n. {5 Q0 Y z# w8 U0.275. H8 j6 b9 f8 q
0.2449, s1 L4 @; }: m/ L; D h4 H; k
0.2222/ s) `' f, t. m2 j, Z7 L
0.1974
3 z, o1 N4 `) E# o, o0.1792
& Q9 H5 p$ B' z& \3 {0.1573
; U8 u+ ~& m* T* e7 }0.1447# T9 Q0 B Y0 [8 @; H
0.1289
' ~: x9 i3 T' q. [& }: N, [0.1155
0 V- ^5 \4 k* s" T3 T0 c1 ^; W0.1072/ F% L ~- d4 a
0.09916 P) Y% J8 ^9 c6 J3 c3 E% A/ {3 K( V
0.092
8 D e$ @" l* e# p0.0877
# a) t. d9 U* S9 k0 P2 J$ B0 b+ M0.0841
& J! k1 t4 F9 p s% h0.0842& m \, b4 H5 `0 C
0.0856
/ ]1 p5 `& \% D2 u$ a& d0.0869
h: x: e% v' O1 O7 \0 y0 y0.0929( w; o I! e7 d
0.10271 p: v3 D7 m; u+ }% F
0.1064
6 }5 [3 d9 A; o& E" D/ Y0.1165
/ D' l/ b8 d5 R S5 m/ [8 i0.1295
+ t5 L2 i4 o+ }$ [# c d& [0.1447
4 I6 E0 J9 |0 L0 f! m Z( h4 F0.1558! s: M( Y$ p# z- P& E
0.1696
3 H+ O* c3 Y/ n ^0.19
\& [$ w% A3 U6 j; {0.21
1 E" a$ r2 @- }+ {! }% ^% h! K0.2287* w' T# A2 Q2 N/ N- W! {4 G
0.2496
& D1 J" S d# U$ P" L0.27199 X1 S! R* H& |1 R1 p
0.2986
$ u# B& _- d6 i' q0.32467 R$ U0 t; S2 X3 M- u! T
0.3432 Y5 ?, N+ k7 } k
0.3720 C; Z* d# j1 s. Z1 @
0.393
5 p. p- I! H. t( }0 y. Z0.415
7 }- E! o) N' [% m0.444$ a- z. ~' U3 W( A1 v
0.47) h/ C! v) a! B3 s; X ~
0.494
8 U1 k: M: M1 j$ o4 _4 V% C( W' h0.5134 T1 a+ s. D5 O
0.542
) x8 `* v( t6 _) e0 D0.573 t m8 v! g. Z
0.6
6 U0 g' m6 |6 L$ `- a7 l/ j0.6133 v9 z7 g5 Z9 m9 x4 I. q& a
0.636" d' d l0 b0 t m% m
0.652# {+ g8 K- \- @' W0 t
0.6752 U$ \3 k: B$ W! r
0.697
* @) z2 R% z, I' Q2 ^6 ~0.71" _, m! g: D1 L1 L# [* r: _
0.729
9 q" q8 O0 P# M9 U$ {1 W) g0.742
: o* o, B8 M9 e( L% m0.76- i/ j4 r |+ D" x, M
0.767
' P! ~/ S6 u! `' d7 S, ]2 N0.777
2 e( `% B3 {, h" p0.785: v M: F8 j# V* Z* M# V# |
0.79/ D4 j u3 b& E' A6 H
0.792" K6 e6 f+ c; t, a' A) |
0.799
! J. C4 p! H: `0.8080 y. A" K I5 S S* J
0.795
% ?" i0 \1 q2 [2 B/ G1 W- K0.794
6 S5 K, g! K* v! F6 n1 [0.789/ l. c& U" m6 H& E$ J
0.786; ]. d# |- q% |; p' G
0.785
F( Y4 y* q6 j$ F* e/ V; b! f0.782- t) o# k0 q3 K$ X& t9 _1 a
0.773
3 t6 r6 w5 R5 A5 _7 h: \0.766
' N; V# c6 d7 V' M+ i" i0.7463 D w& X$ P f; r0 a% r$ ]0 f2 V) h
0.726
' a' J# E- n+ ~9 @5 y/ e; S2 l0.709
/ B: W. D# [! [" s$ n5 F1 O0.697
) Y" U3 m# N0 D7 ~: @# ?8 w+ D0.678 R8 M% }+ y. X
0.658' [' ?. W( c# e$ W+ X+ ~% L, F
0.639
! a. |7 p! L6 v* x6 |0.611( c1 |/ R" l. d5 {: n* G5 Z
0.597
: y& O8 |$ E! O5 g5 {' S0.568! e7 W8 x9 }9 B& X2 R! E" L& E
0.553& q/ w( s# }% W! B2 a- y
0.5220 z6 y$ e. N& t; l9 z% {) b# {* o
0.5011 \8 `7 C0 n9 ?* c/ z( u7 x
0.477
/ o5 O) W; n' M. n1 [4 F& \0.458 `# m$ ~. ~- Y$ _3 V1 F
0.421* U8 {) P. P, G
0.396- W" a4 N; y6 c: z" U
0.373
$ F: Q& ^9 Z' U. e* W% V8 W1 g2 J0.342
$ e6 r! t& q! t0 A/ i# G0.3196
! D, o- ?. @. J3 g6 G# E0.2984
+ Q7 M% T, ]% p) R9 U" J) W# l+ z0.2686
) h- `% L# _( k" ~- \5 A( T0.2559
+ S3 ~$ F/ \! f0 s* L0.21462 o* x" h& d. E6 } p% l! b( ?
0.206% q& `5 m/ x: Q3 R8 d S4 W
0.1936: g& {8 d; K) x' K2 }+ O
0.169
* E; c( H7 e: y0.15169 b2 o4 t8 ~/ l1 u* l2 N
0.1428 v5 K% y" D5 C
0.1234
7 f+ ^: I+ L) Z0.11395 e f% y) q& _: e3 d; w
0.1051
: o) l; }8 @% S4 t5 y0.09627 e2 J) ?& }3 b
0.0895
9 g6 ~7 i6 H2 Q, X! Q) Z- t0.0837
( H# ^ C. S8 V8 I' {/ n: _7 E7 W' v0.0802
" U' F1 S' m. w2 j q0.0782
+ ]% A, p6 J: s0.081' X5 n" A4 b+ ]9 t5 J- B i% h
0.07988 V: R$ _* Q* `7 |. ?% k- z( I! a
0.08240 ?& H8 L1 ?7 n- g
0.087
5 t# r3 [: Z' n* v: T5 \0.0921
, x# M, Y( I# M( g- t3 a; U8 W+ F& I0.10179 t* H' M. o$ Q B: w, Q. l
0.10894 N3 P, q5 n! p6 f* s+ \3 }! ^
0.1205# c' A4 h; `6 y. o6 j
0.1345. Z D/ O1 T0 X1 R! y9 w
0.14674 Z" |5 {% h+ v. V2 U
0.16
# t) h9 m0 z0 i% p. c. P7 e0.1759+ m6 x4 _4 h* W3 b9 `9 Z5 W2 i
0.1947
) x) k3 F5 f1 u4 e5 s0.2144" V! @! x* S4 H* W- c4 X) c* {% `
0.23075 H' V X! B/ P: `7 a; a1 O
0.25531 X8 o# O! p. @+ B
0.241
5 r* ~% s0 O8 O) N$ L7 a0.3002! K( R4 C- v9 R2 }1 @4 r
0.32684 J l+ o% i l2 H) H2 ^0 P
0.348
& e9 C k) \- C3 m8 C0.369% W o( B8 x- v% ^! P: L1 v2 [
0.399 a. K& n& t( d2 A) P$ Q
0.42
. z6 m( M* _5 O0.44& Y; j5 h# x' w- a M' ]
0.4661 \1 F& O o2 n# z. I5 V
0.492" D% b& F0 B+ t; l$ l: K1 n
0.51
9 \1 q! ^1 v: N% @0.535
. P# n) C" ?$ u* ]6 _# v3 `3 E0.555* z$ D2 e3 j/ K" a e7 J4 g
0.576: }% \- i( L3 S
0.5928 L1 s% r& e. g) b! R, {4 R" h
0.622! A7 I) |& V! n+ O" L
0.638' \) q2 v8 x6 \' E3 N6 a- S4 F
0.648
' e9 V! Y+ E4 m" `/ j* g0.666
4 T- y! V, x$ q+ K$ s: W/ ^0.683
& B) e: F! Z) [7 O9 o0.703
5 C, q! ^+ b. [- _. B, s r0.714, l2 z9 L \2 A1 D2 h
0.722/ H8 |4 x0 j) H' P, k9 `2 h% o- l
0.749# _' Z3 K# M5 z
0.752! F1 V9 ^4 z t' I4 ]7 ~
0.752
) J3 ]& y9 H P# h2 J0.759
. w2 E3 W8 x3 M2 p# @: \/ D" |0.763 \/ @* h' m- C, R; \0 ~3 C
0.759
: W. _6 ~% P# E! T( G8 w0.754' E" X) s# t, b* G
0.752
4 R) }$ t* Z$ g; b0.754; \% R) f: V5 C4 q& h
0.751; l6 { H& S. {- r4 q- t
0.746 x) Q1 J' V/ s8 T! w6 Z c7 \% |
0.741' R# u0 r Z8 F2 w# P! Z
0.728
7 _. U* K- @5 x5 i9 {- q/ R) |% j0.715 @. g( s, p7 i: Y+ R
0.702/ T: M a# h, x. T
0.684/ q: f. C! _- [# T
0.677
7 \. N" d. A2 H. [$ t0.662
$ q% |* X4 n/ f0.635' j1 `* R7 j& q* F X j
0.62
% E) v& K" B3 O3 v% ^0.598
. B, g3 h* M: `, _8 ]+ W& ?: d2 g0.586
% h$ }2 F8 ^- n, ?0 Z9 g& T0.56. ~, s, u+ R/ Q7 j- q+ k- n* x- D* u2 P
0.537
- Y! w; v. U1 u2 |0.5131 G& z4 ?1 ^, x# ^& H' [& i
0.494
; ?- {) Q% ~+ {7 G$ c% ~0.4622 H- J3 J: r7 _- L
0.443- v& U0 f9 f1 C# A) ^' d: T
0.414
; E8 K* D# @$ I/ i# i" Y$ G& b0.385]';; S* Z/ v X' j* x* X! b
% [5000 0 25000 3*pi/55],3 I: k* \# d$ y5 U3 s7 l6 j
a=[0.4 0.1 0.4];
( M" v" h- D+ H6 c! R( xfunc_sin = @(a,theta) a(1)*(sin((theta)+a(2)))^2 + a(3);1 O+ G6 [' w' D' }7 h5 z0 k
A= lsqcurvefit( func_sin,a,theta,y1);5 I1 T+ W8 @5 K$ e7 ^1 m4 l/ I0 [
disp(A)5 @2 j% D, \; t% x/ x
4 {/ i* l, j' ?; ?+ O
! o* ^* N U6 L1 L, g" x% S5 @; J错误类型:
: C; j$ I. E( I8 Y' i+ E0 t. |4 {$ N: e( M1 T) g9 A$ c
出错 Untitledexperiment (line 187)
4 c: X7 N3 \3 }. V9 l5 M( dA= lsqcurvefit( func_sin,a,theta,y1);$ y, l ~. T- t% A% o
; L u, _+ k4 f, ]) B+ e, J R
原因:
! k. @2 [4 \. O/ @" O, r5 V8 F Failure in initial user-supplied objective function evaluation. LSQCURVEFIT cannot continue. |
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