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 "*`!.9pt  
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 a*}>yad  
减小字体 增大字体 >S0kiGDV{
 
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2.9.2 指令窗中的 help 指令 <_
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2.9.2.1 直接使用 help 获得指令的使用说明 R'vNJDFY  
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【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。 Wt@hST  
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help logm j[mII5e7g  
LOGM Matrix logarithm. }/\`'LQ  
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. _OJfd  
,B_tA
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[L,esterr] = logm(A) does not print any warning message, but returns an estimate of the relative residual,norm(expm(L)-A)/norm(A). F?jD5M08t/  
b>i5r$S8G  
If A is real symmetric or complex Hermitian, then so is LOGM(A). ai?N!RX%H  
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Some matrices, like A = [0 1; 0 0], do not have any logarithms, real or complex, and LOGM cannot be expected to produce one. av5a2r0W1  
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See also EXPM, SQRTM, FUNM. !;vv-v,LQ  
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2.9.2.2 使用 help 指令进行分类搜索
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【例 2.9.2 .2-1 】运行不带任何限定的 help ，可以得到分类名称明细表。 4M]l~9;A  
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help /:{4,aX2  
HELP topics: 4^YE*6z  
matlab\general - General purpose commands. a9 q:e  
matlab\ops - Operators and special characters. (C uM*-  
matlab\lang - Programming language constructs. 79}jK"Gc  
matlab\elmat - Elementary matrices and matrix manipulation. g)ZMU^1  
matlab\elfun - Elementary math functions. 5D<ZtsXE  
matlab\specfun - Specialized math functions. ?EHheZ{  
......            ...... <s\ZqL$f  
For more help on directory/topic, type "help topic". j_h:_D4  
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2.9.2.3 采用 help topic 指令形式获得具体子类的指令明细 ]xoG{%vgb  
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【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。 .}Xf<G&  
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help elmat h6?Z  
Elementary matrices and matrix manipulation. D:IG;Rsc  
Elementary matrices. n53c}^  
zeros - Zeros array. 9;\mq'v%  
ones - Ones array. #639N9a~  
...... ...... ZQ*Us*9I  
b5Q>e%i#  
Basic array information. u8%X~K\  
size - Size of matrix. S3WUccv  
length - Length of vector. Q(q&(/  
...... ...... X's<+hK&  
}a
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Matrix manipulation. uifVSf*  
reshape - Change size. GP %hf{  
diag - Diagonal matrices and diagonals of matrix. HOCj* O4  
...... ...... e3p:lu  
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Special variables and constants. QX<x2U  
ans - Most recent answer. L1DH9wiQi  
eps - Floating point relative accuracy. bX:h"6{=R  
...... ...... R?9x!@BV  
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Specialized matrices. PXJ7Ek*/  
compan - Companion matrix. Suo$
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gallery - Higham test matrices. |S|'o*u  
...... ...... Su?cC/  
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〖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。 9^8OIv?m8  
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2.9.3 指令窗中的 lookfor 指令 {i8zM6eC  
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【例 2.9.3 -1 】查找包含积分这个关键词的所有指令。 { %]imf|g.  
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lookfor integral m_Q&zp["  
ELLIPKE Complete elliptic integral. vDi Opd  
EXPINT Exponential integral function. f^u-Myk  
DBLQUAD Numerically evaluate double integral. NV9JMB{q  
INNERLP Used with DBLQUAD to evaluate inner loop of integral. BbCO K  
QUAD Numerically evaluate integral, low order method. h4F%lGot  
QUAD8 Numerically evaluate integral, higher order method. ybJwFZ80  
COSINT Cosine integral function. k1zK3I&c_  
SININT Sine integral function. q}VdPt>X/  
ASSEMA Assembles area integral contributions in a PDE problem. 'U`;4AN  
COSINT Cosine integral function. udLIAV*  
FOURIER Fourier integral transform. p)?6#~9$  
IFOURIER Inverse Fourier integral transform. !3mt<i]a"  
SININT Sine integral function.

MATLAB 指令窗中的help指令和lookfor指令 #m{*]mY@  
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)#{<#*2  
减小字体 增大字体 NBc^(F"  
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2.9.2 指令窗中的 help 指令 V\<2oG  
<c p
ck  
2.9.2.1 直接使用 help 获得指令的使用说明 vb6EO[e%I  
V1V0T ,  
【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。 $P0q!  
=ZIT!B?4  
help logm `/P/2{,~  
LOGM Matrix logarithm. G!r)N0?_f  
L = LOGM(A) is the matrix logarithm of A, the inverse of EXPM(A). Complex results are produced if A has negative eigenvalues. A warning message is printed if the computed expm(L) is not close to A. M }d:B)cz  
>{IPt]PCn  
[L,esterr] = logm(A) does not print any warning message, but returns an estimate of the relative residual,norm(expm(L)-A)/norm(A). .=#jdc/  
Zg(Y$ h\  
If A is real symmetric or complex Hermitian, then so is LOGM(A). bhpku=ov  
V<0iYi;4=  
Some matrices, like A = [0 1; 0 0], do not have any logarithms, real or complex, and LOGM cannot be expected to produce one. gtA34iw  
SE]5cJ'>  
See also EXPM, SQRTM, FUNM. WxGD*%  
fj5g\m  
2.9.2.2 使用 help 指令进行分类搜索 '|^:,@8P9  
P)=.Du)  
【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。 L
au@HYW0  
S v>6:y9?G  
help &P|[YP37_  
HELP topics: JF
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matlab\general - General purpose commands. 8I#ir4z#<  
matlab\ops - Operators and special characters. `)n4I:)2  
matlab\lang - Programming language constructs. p?rl
x#M  
matlab\elmat - Elementary matrices and matrix manipulation. 3N+lWuE}K  
matlab\elfun - Elementary math functions. XZM3zlg*  
matlab\specfun - Specialized math functions. EX`P(=zD  
......            ...... E6A"Xo  
For more help on directory/topic, type "help topic". MCT1ZZpPr  
r<e%;S  
2.9.2.3 采用 help topic 指令形式获得具体子类的指令明细 RU:Rt'  
Y$r78h=4  
【例 2.9.2 .3-1 】如果用户想知道有关矩阵操作指令一栏表，那末就运行以下指令。 A]/o-S_  
eyJ07  
help elmat ^[tE^(|T  
Elementary matrices and matrix manipulation. Bvn3:+(47  
Elementary matrices. YZBh}l6t  
zeros - Zeros array. JF
.Lo;  
ones - Ones array. ?0VR2Yb${b  
...... ...... +tqErh?Al  
F3qK6Ah.  
Basic array information. C8}:z\A_@Z  
size - Size of matrix. !.]JiT'o  
length - Length of vector. n~*".ZC'Y  
...... ...... NXY jb(4:  
3yZmW$E.  
Matrix manipulation. G21o@38e  
reshape - Change size. 5~JT*Ny  
diag - Diagonal matrices and diagonals of matrix. ^"/^)Lb!@M  
...... ...... Cl}nPUoL  
Zh<;r;2  
Special variables and constants. pIJXP$v3  
ans - Most recent answer. bV_nYpo  
eps - Floating point relative accuracy. %t9C  
...... ...... T pkSY`T  
86r5!@WN  
Specialized matrices. >1~ /:DJ  
compan - Companion matrix. $1an#~  
gallery - Higham test matrices. IY`p7 )#i  
...... ...... 1sQIfX#2f  
nVb@sI{{k  
〖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。 9)q3cjP{<  
}vd*eexA  
&_ekA44E  
2.9.3 指令窗中的 lookfor 指令 QU|_ r2LM  
WlMcEje  
【例 2.9.3 -1 】查找包含积分这个关键词的所有指令。 OU[<\d
 
E $@W~).!  
lookfor integral {*ak>Wud  
ELLIPKE Complete elliptic integral. (\9`$  
EXPINT Exponential integral function. #<im?  
DBLQUAD Numerically evaluate double integral. /d8o*m'bu!  
INNERLP Used with DBLQUAD to evaluate inner loop of integral. uepyH  
QUAD Numerically evaluate integral, low order method. Ey46JO"  
QUAD8 Numerically evaluate integral, higher order method. %@/^UE:  
COSINT Cosine integral function. P#,u9EIJ  
SININT Sine integral function. =!O->C:  
ASSEMA Assembles area integral contributions in a PDE problem. `Lf'/q  
COSINT Cosine integral function. RLB3 -=9t  
FOURIER Fourier integral transform. #%0V`BS7n  
IFOURIER Inverse Fourier integral transform. 1o_
kY"D<  
SININT Sine integral function.

这真是个好东东啊！！顶

真是好东西啊 CT|+?  
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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