matlab的数值分析方法 [复制链接]

打包到一起就更好了,让大家花这么多TB,不好吧,

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打不开？？？？

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系诶下诶歇息诶的

谢谢MATLAB 指令窗中的help指令和lookfor指令 b|ZLX:  
作者：精通MATLAB(5.3版)  来源：转载http://www.51base.com/machine/softedu/cam/matlab/5120060126150.shtml  发布时间：2008-4-16 9:29:54 G+yL;G/  
减小字体 增大字体 p`GWhI?  
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2.9.2 指令窗中的 help 指令 xeB4r/6  
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2.9.2.1 直接使用 help 获得指令的使用说明 ZPF7m
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feCqbWq:  
【例 2.9.2 .1-1 】假如准确知道所要求助的主题词，或指令名称，那末使用 help 是获得在线帮助的最简单有效的途径。本例演示：关于矩阵对数函数 logm 使用说明的在线求助。 \|Qb[{<:,  
@\~tHJ?hQd  
help logm p^8JLC  
LOGM Matrix logarithm. :^G%57NX  
L = LOGM(A) is the matrix logarithm of A, the inverse of EXPM(A). Complex results are produced if A has negative eigenvalues. A warning message is printed if the computed expm(L) is not close to A. ;i9>}]6  
y~p4">]  
[L,esterr] = logm(A) does not print any warning message, but returns an estimate of the relative residual,norm(expm(L)-A)/norm(A). 0 
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Dq`~XS*  
If A is real symmetric or complex Hermitian, then so is LOGM(A).  5T/J%  
+a]j[#  
Some matrices, like A = [0 1; 0 0], do not have any logarithms, real or complex, and LOGM cannot be expected to produce one. y[:q"BB3  
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See also EXPM, SQRTM, FUNM. u)7 ]1e{  
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2.9.2.2 使用 help 指令进行分类搜索 baIbf@t/  
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【例 2.9.2 .2-1 】运行不带任何限定的 help ，可以得到分类名称明细表。 l7Lj[d<n  
v[D&L_  
help ]xR4->eix  
HELP topics: _>v0R'  
matlab\general - General purpose commands. g9qC{xd  
matlab\ops - Operators and special characters. XOxB (0@  
matlab\lang - Programming language constructs. n{=7 yK  
matlab\elmat - Elementary matrices and matrix manipulation. q2!'==h2i  
matlab\elfun - Elementary math functions. 2 `5=0E1k  
matlab\specfun - Specialized math functions. d
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......            ...... %FlA":W  
For more help on directory/topic, type "help topic". )nnCCRS6  
4zzlazU  
2.9.2.3 采用 help topic 指令形式获得具体子类的指令明细 B+Q+0tw*i  
-]QguZE  
【例 2.9.2 .3-1 】如果用户想知道有关矩阵操作指令一栏表，那末就运行以下指令。 u&SZlkf6%  
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help elmat k2
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Elementary matrices and matrix manipulation. C*O ,rm}  
Elementary matrices. y#bK,}  
zeros - Zeros array. bpMl =_  
ones - Ones array. ou;qO 5CT  
...... ...... M]B3vPA/v  
6z1\a  
Basic array information. 3G&0Ciet  
size - Size of matrix. DVzssPg  
length - Length of vector. ~@YQ,\Y  
...... ...... q5?L1  
\[T{M!s  
Matrix manipulation. 966<I56+  
reshape - Change size. b8HE."*t  
diag - Diagonal matrices and diagonals of matrix. vpa
fru4  
...... ...... H56 ^n<tg  
i>"dBJh]b  
Special variables and constants. %uEtQh[  
ans - Most recent answer. v?%3~
XoH  
eps - Floating point relative accuracy. O3+)qb!X  
...... ...... 9>{t}Id  
Bj&_IDs4  
Specialized matrices. <~O}6HQ#  
compan - Companion matrix. e;;):\p4  
gallery - Higham test matrices. c `ud;lI  
...... ...... yId;\o B  
A|C_np^z2  
〖说明〗省略号由笔者所加，用来表示被删除的内容。这样做是出于节省篇幅的考虑。 M1(9A>|nF  
fM{1Os  
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2.9.3 指令窗中的 lookfor 指令 A^cU$V%?W  
gV.f*E1C  
【例 2.9.3 -1 】查找包含积分这个关键词的所有指令。 (+x]#
#Q  
3"vRK5Bf  
lookfor integral \=8=wQv  
ELLIPKE Complete elliptic integral. 6oA~J]<  
EXPINT Exponential integral function. &GU@8  
DBLQUAD Numerically evaluate double integral. 1C'P)f28  
INNERLP Used with DBLQUAD to evaluate inner loop of integral. /u?9S/  
QUAD Numerically evaluate integral, low order method. 8;8YA1@w  
QUAD8 Numerically evaluate integral, higher order method. j=Q$K#sBt  
COSINT Cosine integral function. {,F/KL^u  
SININT Sine integral function. od(:Y(4  
ASSEMA Assembles area integral contributions in a PDE problem. ^
vn\4  
COSINT Cosine integral function. aG Ef#A  
FOURIER Fourier integral transform. fD(7FN8  
IFOURIER Inverse Fourier integral transform. bpnv&EG  
SININT Sine integral function.

MATLAB 指令窗中的help指令和lookfor指令 3/l\ <{  
作者：精通MATLAB(5.3版)  来源：转载http://www.51base.com/machine/softedu/cam/matlab/5120060126150.shtml  发布时间：2008-4-16 9:29:54 enPLaiJ'|q  
减小字体 增大字体 9H[/Tj-;  
94+/wzWvi  
2.9.2 指令窗中的 help 指令 )"F5lOA6  
jjX%$Hr  
2.9.2.1 直接使用 help 获得指令的使用说明 K{N%kk%F  
,{pGP#  
【例 2.9.2 .1-1 】假如准确知道所要求助的主题词，或指令名称，那末使用 help 是获得在线帮助的最简单有效的途径。本例演示：关于矩阵对数函数 logm 使用说明的在线求助。 [NZ-WU&&LP  
f^u^-l  
help logm g#Mv&tU  
LOGM Matrix logarithm. J& )#G@fRX  
L = LOGM(A) is the matrix logarithm of A, the inverse of EXPM(A). Complex results are produced if A has negative eigenvalues. A warning message is printed if the computed expm(L) is not close to A. jPpRsw>  
WT?bBf  
[L,esterr] = logm(A) does not print any warning message, but returns an estimate of the relative residual,norm(expm(L)-A)/norm(A). yFi6jN#~  
DH/L`$  
If A is real symmetric or complex Hermitian, then so is LOGM(A). n_u`B|^Pj  
v}&#f&q!  
Some matrices, like A = [0 1; 0 0], do not have any logarithms, real or complex, and LOGM cannot be expected to produce one. EFwL.'Fh  
)ZN(2z  
See also EXPM, SQRTM, FUNM. W8x[3,gT  
RZe#|k+ 8  
2.9.2.2 使用 help 指令进行分类搜索 gjQ=8&i  
T|!D>l'  
【例 2.9.2 .2-1 】运行不带任何限定的 help ，可以得到分类名称明细表。 vi<X3G6Xh  
Y!;gQeC  
help ru DP529;  
HELP topics: 6I5o2i  
matlab\general - General purpose commands. bz$Qk;m=H  
matlab\ops - Operators and special characters. OFIMi^@  
matlab\lang - Programming language constructs. Liij{ahm  
matlab\elmat - Elementary matrices and matrix manipulation. y3IA '  
matlab\elfun - Elementary math functions. /4^G34  
matlab\specfun - Specialized math functions. RE*WM3QK~  
......            ...... \.kTe<.:_  
For more help on directory/topic, type "help topic". ) (+)Q'*  
9='=-;@/5  
2.9.2.3 采用 help topic 指令形式获得具体子类的指令明细 }R`Irxv4  
 rWqkdi1  
【例 2.9.2 .3-1 】如果用户想知道有关矩阵操作指令一栏表，那末就运行以下指令。 2H3(HZv  
%P(;8sS  
help elmat 6QW<RXom  
Elementary matrices and matrix manipulation. K
c-Y  
Elementary matrices. ,b:n1  
zeros - Zeros array. @7)Z  
ones - Ones array. {:3.27jQ  
...... ...... u2\+?`Ox  
zfir
b  
Basic array information. s><IykIi  
size - Size of matrix. n'ehB%"  
length - Length of vector. }U(\~ =D  
...... ...... XL&hs+Y  
Ou? r {$(b  
Matrix manipulation. K`~BL=KI  
reshape - Change size. 2q/nAQ+  
diag - Diagonal matrices and diagonals of matrix. jjX'_E  
...... ...... [\88@B=jXP  
0Ux<16#  
Special variables and constants. w/O<.8+  
ans - Most recent answer. 4uX,uEa  
eps - Floating point relative accuracy. rQn{L{  
...... ...... 6mi$.' qP  
"NJ,0A  
Specialized matrices. @c0n2 Xcr  
compan - Companion matrix. 9ptZVv=O  
gallery - Higham test matrices. (lieiye^  
...... ...... pK<%<dIc  
mZ~mf->%  
〖说明〗省略号由笔者所加，用来表示被删除的内容。这样做是出于节省篇幅的考虑。 2|$lk8/,  
E3LBPXK  
,zG<7~m  
2.9.3 指令窗中的 lookfor 指令 r7RU"H:j8  
 YN4"O>  
【例 2.9.3 -1 】查找包含积分这个关键词的所有指令。 b#Jo Xa9  
\m%J`{Mt  
lookfor integral K q/~T7Ru  
ELLIPKE Complete elliptic integral. g%X&f_@  
EXPINT Exponential integral function. Uld_X\;Q4  
DBLQUAD Numerically evaluate double integral. ~c!Rx'  
INNERLP Used with DBLQUAD to evaluate inner loop of integral. yB=C5-\F  
QUAD Numerically evaluate integral, low order method. ([[)Ub$U  
QUAD8 Numerically evaluate integral, higher order method. v;Swo("  
COSINT Cosine integral function. R04.K!  
SININT Sine integral function. ^g70AqUc  
ASSEMA Assembles area integral contributions in a PDE problem. c1PViko,>  
COSINT Cosine integral function. xcw%RUC-  
FOURIER Fourier integral transform. XynU/Go,  
IFOURIER Inverse Fourier integral transform. 9^(HXH_f  
SININT Sine integral function.

这真是个好东东啊！！顶

真是好东西啊 T=^jCH &  
下了啊谢谢

你分那么细！！呜呜。。。没钱了呢！！你就一个包撒！！不过还是多谢楼主共享哈。！！！

谢谢无私奉献

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