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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;
' k N% G6 r) h( ntheta=linspace(0,rad2deg(2*pi),181);* p& D j! h( a* d1 Q/ k6 d
y1=[0.512 o* o4 i# C, W* c8 |$ w
0.471
, \! x# A7 n4 a! ~. c5 k' U- D0.4456 B" a2 c5 j, p% F" A* Y( A3 u
0.408
7 K1 T. @ d! c0.382
$ T; o) s/ W5 B/ y0.347% Q+ A. H/ j, b" p
0.33, J% W0 d3 e/ w% T: P3 q0 @
0.295
5 I4 @+ t) J* _% W: r0.275
2 U. S t5 N4 l* S) J Q0.2449
6 o, @3 E0 M6 I' J# v5 w0.2222
" W! S* P+ s: {6 c$ q4 q' }0.1974
- s4 V/ X% u2 U: m/ C0.1792
, _9 R4 t* p7 C# P0.1573
' T" }, H, g0 S4 a0.14471 D0 D$ Z0 \, U& q# I( n M" R
0.1289
; O8 z \" c$ E- M& w8 C8 S0.11550 U u+ F# _6 x: ]3 p9 O
0.1072
% t- E$ i. ^2 l2 |3 S: P9 @0.0991 h. y6 w }# e$ o5 ~) \
0.092 ^% @/ T4 @5 ?. z1 B
0.0877( J3 o- }' g- b; y
0.0841
: W( T3 E4 u0 f& {3 f0.08428 V" j7 v! l2 r8 s+ o2 Y
0.0856
& k( }3 }7 U% ]( T7 _0.0869- ?4 B7 ~$ i7 h8 d
0.0929
- q2 n, Y' A" o. T7 u! Y0.1027
4 I: o$ V- U0 l6 {* X% N; d0.1064; W! i& _$ ^! C( w. p' N7 s! x
0.11654 [7 w# p- n; M
0.1295' \9 l. ~. s$ j5 M g( l
0.1447
0 @0 _, ?* r" U$ k3 W$ Y0.1558, ]8 A- b9 e, ^. I
0.1696& O( A9 E8 p( p! T H5 c
0.19- l8 M. O* W* `, w8 a7 S
0.21$ r/ X5 y9 E( j! g) k! }. B$ h' b
0.2287
8 o( y1 K+ _; K! m0.2496: k9 a9 u$ v+ @# E
0.2719" K3 V$ P# |) x+ z9 o7 r! d
0.2986
- `7 e# l& a: N0 d' Z. ^0.3246. n" N& s. H! B0 P! {7 H4 T
0.343
3 \9 I2 ?% t! |# f/ {0.3729 z; b3 E7 ~7 U
0.393
' S2 M$ g( g+ C! v0.415* r- P; m) E# y3 q P& i
0.444
. X( q( ?9 V# e6 ^) p0.47
1 l. @; P; W/ c- h; X# Y) ^! m0.494
; U/ A6 D$ q2 j8 `; c0.513
8 t5 H" T w2 s3 N0.542
1 d3 @' g0 \5 X# J' G; v$ h( E) F0.573& r6 w/ `6 h/ p* j
0.6) e% ~% C# }! N& ~) }
0.6136 u, W8 t6 i( |7 o2 u) s
0.636
7 @! w3 v$ d: S9 Y {* m- b0.652
- u; h4 c: }0 @0.6751 L. r4 T1 J. m6 I2 Z; L. Q
0.697
/ h6 h6 u6 e% P4 G; n* g# ]7 I0.71
' J+ E Q) r6 Y- V p1 c0.7293 O: P( i# L o- F7 E/ A. B
0.7428 W0 ^( J% x6 O- u* G( e E+ @
0.76* k3 A1 T) t6 B
0.767: s7 J, c7 ]& p! `3 O# |! q
0.777) u; ]& ^% k, C" V6 p
0.785" h- d! e( W( [* ?2 Z
0.79- ^' \8 z& U! U( v
0.7926 t+ _1 Q c- o1 E$ J
0.799: V7 ]# \/ A0 N+ X# d
0.8082 B; [9 O# e1 ^- R R
0.795
+ v, P Z K: c% z0.794: Q3 R5 `& e+ U2 D
0.7892 ~ d: a* z2 k5 n1 Q
0.7867 n8 x, [0 I) k9 A Z
0.785
# s$ Y4 r* s, r$ p$ p! _0.782/ R% @: a9 d9 F0 J8 J* H
0.7730 z& [4 I5 R9 l: a, h
0.766
& u4 M# J: }4 p* q/ E. P+ Z0.746
2 }2 B' [7 c+ }: v0.726
# Y( ?, W/ L) b9 Q0.7092 p" t* K9 O- f! {- p
0.697
0 e p$ b' ^: o+ m0.678$ @ @/ o% X/ }3 W5 I3 A
0.658
3 h2 a! k/ D- D y: e2 |0.639
% `$ E% u1 e$ b3 J0.611
* F/ F& a; P& s" n0.597
; U5 P. A) S0 X! @ L0 o2 n0.568% x" I+ C R" Z6 |8 ~0 U
0.553
0 O, S9 W' k# U* _% A( ?. j1 n0.522
- X" T$ Q/ {; B. q- R0.501% d3 H9 F% y. Q* a$ H
0.477
# f r( A( Q" a0.45
3 q" |7 a. A4 E a: q0.421. ~0 c. F! G9 U* L9 o
0.396
$ w9 n$ }$ d( b9 r# A8 l$ K/ s' ]0.373
$ v3 u5 Y9 q+ r c0.342
& l+ J" S3 x' [9 U) {/ i: J& o" q0.3196& Z( T: u, o6 d- H1 a+ M1 v# `
0.2984
. m) ]3 X8 p/ t( o) S& f4 i0.2686+ |, G% U( ^5 V
0.2559
9 k9 }$ }# T1 U; \0.2146: @8 x6 _- A' L& K/ s5 J4 {' C
0.206! i' M, v% m! R4 ~9 r* I
0.1936
: m B8 C7 {. ~6 Z' u: V6 P0.169& X- z! }) F0 f. z6 E) `; R' D
0.1516) f( m' T" F' @! a
0.1428
2 t0 X+ y! ?- _8 S( [ s0.1234
3 Y3 R! \/ i9 E) p0.1139
; w* x+ S9 _" s5 f9 o9 L M7 k- D" F4 J0.1051
$ M& \: j# d8 M- f" ? w& r0.0962
X! p- [. H! b$ M4 Y' r) w0.0895& W# `8 s/ U- h' k, E# B; s
0.0837
& j2 t4 S, r: z* O+ u( Q. v0.0802
, j; b" P: i8 [. S1 A( O0.0782
- W7 j/ N3 h$ Z$ `8 Z P0.081& A0 F. T) z4 `8 p
0.0798
6 I' p! X* }* y. ?: Y, b% u0.0824
/ b& t3 o7 @& H* c: @3 K0.087
" w, ]% h( t' Z! [7 `0.0921: S) R5 p) U3 X3 r! o& E7 p
0.1017
1 b' z# W N/ ~, p. O0.10897 t9 n/ v0 V( |6 E/ S0 L. L0 }' y6 |* q
0.12059 h( V6 q" A' `
0.1345
. @1 \ o e8 H; n, s, B6 ^0.1467
. ~- q2 s' I1 P- `& Z0.162 h1 }% K) C9 q; E3 `% h
0.1759
( d! j2 R3 \6 `8 Q2 k+ J0.1947. Z' {" _( d8 N/ `
0.2144" a+ s$ s$ e3 a$ B f# c! _9 ?' I
0.2307
& f0 ?) y! e1 U0.2553& ^( V) I+ z1 H- |/ Y
0.241/ g! X# I* f, _7 R& `; p
0.3002
6 R+ i5 P$ h/ {: a( {0.3268# K) f- l( M# F1 y/ c
0.3483 P- K1 E* }, z* z
0.3691 T d* w b+ e- s
0.399
! y$ ?; R3 Y4 Q( e5 @5 y$ E0.42) i8 T* q d" K% ]) @) N
0.44
" G ]" S B. n: M% t0.466$ A! D2 D; t* ]8 P
0.4925 G4 P% Y- I2 e' ^0 P9 H3 B; V
0.51
! v8 u4 \7 M: I F0.535
" g3 {. W* _6 L0.555& M9 L% M4 n$ Y7 I V. m3 Q
0.576$ a1 x# M% l7 K$ K3 u5 y0 h
0.592
: P" N' ]5 z7 A& U+ W$ m0.622
0 }6 V) P4 Y7 Y* u0.638
* ]- r1 g* z# `. l0.648- ]& |8 q/ a- M
0.666$ ?2 Q; t: C2 ^0 r- p
0.683
3 h7 a1 |) d# i/ f8 Z9 @! E0.703
% [6 R l+ r. V* [0.714
5 M3 |! Q0 @/ ~0.7222 {& E0 p$ s" ?$ C
0.749, k% j8 b3 s; J, U! v7 y( ~
0.752" }/ `: y" w6 j! n. w& T0 K6 K
0.752
1 F- y7 x8 f* _$ W0.759
- R3 V$ f+ s7 X3 i! T0.76
# H/ c, W" _, T" G; y1 I0.7598 B5 X N. p* u8 I7 J
0.7549 B0 L$ G( A% ?4 A; @, J: K7 R
0.752: p- j2 v2 d/ X% k
0.754
. c+ z* ^/ `/ ~4 L9 x) I0.751
0 @9 {% V% G1 T/ o/ n0.746. ?0 f5 \; E; E- u9 g1 P0 W
0.741
1 R: B% W: }/ W0.728
( G1 L0 ?8 U3 j6 }) Q& \, D# q0.715
7 y% Q. |* l1 R6 T$ ?7 f) q& O0.702" J. a/ @ m$ L. Z3 H3 e1 {# p
0.684
2 g& E$ k" V. }6 R% R, ~: `% m0.6771 [) u) A5 ]. |: o0 I
0.662
6 N1 a& s0 P, _( v# l/ o0.6353 I6 c: v; j) m+ p; x
0.624 [* a4 H. A& W9 h" g
0.598
% L, _6 e4 J2 \0.586% o/ O" {6 A) z* ~6 X7 J3 W( e$ L& W
0.56
7 _2 \# d4 z+ J0 }9 m; j2 e9 U& n* Z8 q0.537; r! F7 h9 Y0 S, v+ n
0.513
1 e. q( M. o+ i. |" q \0 C% U0.494
2 n0 G1 I8 f4 [5 N8 Y0.462
& ]. r+ ], V/ V6 b( O8 O- m/ m0.443
" r7 m8 G9 Y7 C; Y2 s0.414
- Z# @% j7 c% e; M0 k( |5 |0.385]';
$ r2 Y" { e# @9 G% W% [5000 0 25000 3*pi/55],/ E% W" l" f1 j8 I
a=[0.4 0.1 0.4];/ }, ~. V- D* e( N. v1 w6 B
func_sin = @(a,theta) a(1)*(sin((theta)+a(2)))^2 + a(3);
8 A' [, e8 o% k4 M# _A= lsqcurvefit( func_sin,a,theta,y1);1 q- Y9 e4 n% v. j. C' b; z
disp(A)
2 i; B% F7 ]5 a+ m, x9 v( c% Z+ v. V! t2 }
* g, R. I8 w! b( b& t9 j8 s
错误类型：/ u( X0 e4 J$ i# x. y/ C9 P* s' i
1 H8 g! _6 T' k
出错 Untitledexperiment (line 187)
6 j" N* w5 J4 y; E& `3 TA= lsqcurvefit( func_sin,a,theta,y1);
4 S2 m: G/ T; ^2 z+ ^! z1 s8 F- m7 J9 o: e y
原因:) ?, P" L7 P* l' ?: _+ W: O
Failure in initial user-supplied objective function evaluation. LSQCURVEFIT cannot continue. |
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发表于 2020-3-12 13:56
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