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？？？？

大哥你放在一起多好啊，这样简直要人命啊

系诶下诶歇息诶的

谢谢MATLAB 指令窗中的help指令和lookfor指令 c/B'jPt  
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 /C/id)h>  
减小字体 增大字体 &/Ro lIHF  
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2.9.2 指令窗中的 help 指令 z4&iK)x  
i)#s.6.D>  
2.9.2.1 直接使用 help 获得指令的使用说明 )tC
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Hm+ODv9  
【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。 |_omr&[_  
p>_;^&>&  
help logm G^q3Z#P  
LOGM Matrix logarithm. ZeG_en ;  
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. mv5n4mav  
?<G]&EK~~]  
[L,esterr] = logm(A) does not print any warning message, but returns an estimate of the relative residual,norm(expm(L)-A)/norm(A). B||;'  
spasB=E  
If A is real symmetric or complex Hermitian, then so is LOGM(A). mhW-J6u*  
o)OUWGjb/K  
Some matrices, like A = [0 1; 0 0], do not have any logarithms, real or complex, and LOGM cannot be expected to produce one. aR\\<due  
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See also EXPM, SQRTM, FUNM. a0Ik`8^`  
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2.9.2.2 使用 help 指令进行分类搜索 qc#)!  
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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。 8k(P,o  
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help )sho*;_o  
HELP topics: 9;?UvOI;  
matlab\general - General purpose commands. k</%YKk  
matlab\ops - Operators and special characters. {EdH$l>94  
matlab\lang - Programming language constructs. `vc "Q/  
matlab\elmat - Elementary matrices and matrix manipulation. #2`D`>7456  
matlab\elfun - Elementary math functions. *D'$"@w3  
matlab\specfun - Specialized math functions. ='TE,et@d  
......            ...... y^]tahbo  
For more help on directory/topic, type "help topic". c1%H4j4/  
>DPB!XA3  
2.9.2.3 采用 help topic 指令形式获得具体子类的指令明细 lV.F,3  
ho>k$s?  
【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。 RT>{*E<I  
-Ij&  
help elmat Xn~I=Ml d  
Elementary matrices and matrix manipulation. O@?kT;B  
Elementary matrices. LN_xq&.  
zeros - Zeros array. 7Sz?S_N/j  
ones - Ones array. ~tOAT;g}q  
...... ...... PvGDTYcKp
 
QXF aAb=(7  
Basic array information. P>9aI/d9  
size - Size of matrix. 1 { , F
 
length - Length of vector. 8EVgoJ.  
...... ...... Fq9Q+RNMZL  
lY*[tmz)  
Matrix manipulation. *m2=/Sh  
reshape - Change size. JsO *1{6g  
diag - Diagonal matrices and diagonals of matrix. "bDs2E+W  
...... ...... 0(_l|PScF  
`GXkF:f=  
Special variables and constants. YDGS}~m~Q  
ans - Most recent answer. H5D*|42  
eps - Floating point relative accuracy. yjJ5P`j]  
...... ...... <L&m4O#|  
.(Qx{r$  
Specialized matrices.
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compan - Companion matrix. aTf`BG{kw  
gallery - Higham test matrices. "TH6o:x  
...... ...... +nQw?'9Z  
v:+~9w+  
〖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。 )]#aauC+  
G<M:Ak+~  
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2.9.3 指令窗中的 lookfor 指令 tl'n->G>v  
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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。 r=c<--_@  
0-{tFN  
lookfor integral h5yzwj:C?  
ELLIPKE Complete elliptic integral. $cu00
K  
EXPINT Exponential integral function. A{B/lX)  
DBLQUAD Numerically evaluate double integral. k
i>~H!zB  
INNERLP Used with DBLQUAD to evaluate inner loop of integral. (MHAJ]Rx  
QUAD Numerically evaluate integral, low order method. y,pZTlE  
QUAD8 Numerically evaluate integral, higher order method. MQKfJru7  
COSINT Cosine integral function. x1 1U@jd+1  
SININT Sine integral function.  ["}rk  
ASSEMA Assembles area integral contributions in a PDE problem. T)\"Xj  
COSINT Cosine integral function. r\;ut4wy  
FOURIER Fourier integral transform. M@
W[Bz  
IFOURIER Inverse Fourier integral transform. l|5fE1K9U  
SININT Sine integral function.

MATLAB 指令窗中的help指令和lookfor指令 ^t7x84jhL  
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 LW:o8ES33  
减小字体 增大字体 b3YO!cJ  
) _ I,KEe  
2.9.2 指令窗中的 help 指令 ! Q<>3xZ  
76.{0c  
2.9.2.1 直接使用 help 获得指令的使用说明
h d~$WV0#  
OGiV{9U  
【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。 #0 6-:  
$BmmNn#  
help logm <}6{{&mT4  
LOGM Matrix logarithm. |w}xl'>q  
L = LOGM(A) is the matrix logarithm of A, the inverse of EXPM(A). Complex results are produced if A has negative eigenvalues. A warning message is printed if the computed expm(L) is not close to A. 4 g. bR  
!A1)|/a@  
[L,esterr] = logm(A) does not print any warning message, but returns an estimate of the relative residual,norm(expm(L)-A)/norm(A). ;6 +}z~  
@Mvd'.r<;  
If A is real symmetric or complex Hermitian, then so is LOGM(A). `pd&se'p  
0b91y3R+  
Some matrices, like A = [0 1; 0 0], do not have any logarithms, real or complex, and LOGM cannot be expected to produce one. t:LcNlN|  
Q !qrNa6  
See also EXPM, SQRTM, FUNM. fFjH "2WD  
3?E8\^N\n  
2.9.2.2 使用 help 指令进行分类搜索 Jx#k,Z4  
0ult7s}  
【例 2.9.2 .2-1 】运行不带任何限定的 help ，可以得到分类名称明细表。 P'MY[&|mM'  
>!6i3E^  
help )EyI0R]5  
HELP topics: 2k6 X,  
matlab\general - General purpose commands. n]+W 3[i  
matlab\ops - Operators and special characters. )rLMIk  
matlab\lang - Programming language constructs. Nx#4W1B[`H  
matlab\elmat - Elementary matrices and matrix manipulation. x_
|
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matlab\elfun - Elementary math functions. ~7!7\i,Y8\  
matlab\specfun - Specialized math functions. 5BR5X\f0  
......            ...... _ .i3,-l)  
For more help on directory/topic, type "help topic". @5) 8L/[l  
p (FlR?= S  
2.9.2.3 采用 help topic 指令形式获得具体子类的指令明细 fx8EB8A7K7  
`IINq{Zk  
【例 2.9.2 .3-1 】如果用户想知道有关矩阵操作指令一栏表，那末就运行以下指令。 FI8Oz,  
}B7K@Wu#  
help elmat Cc?TSZ8[  
Elementary matrices and matrix manipulation. I &*_,d  
Elementary matrices. ~8|t*@D  
zeros - Zeros array. gqib:q;r  
ones - Ones array. *b}>cn)<v  
...... ...... e$c?}3E!z  
6I_Hd>4  
Basic array information. Fyyg`J  
size - Size of matrix. HmK*bZ  
length - Length of vector. 9s +z B  
...... ...... +D#Zn!P  
uR6w|e`  
Matrix manipulation. Wl^R8w#Z$  
reshape - Change size. 5W =(+Q>C  
diag - Diagonal matrices and diagonals of matrix. t)oapIeIe  
...... ...... 6pE :A@  
N^VD=<#T  
Special variables and constants. zT~B6  
ans - Most recent answer. -G &_^"=R  
eps - Floating point relative accuracy. ?j7vZ}iRi  
...... ...... J
` {6l  
!e#xx]v3  
Specialized matrices. ihT~xt  
compan - Companion matrix. k&hc m  
gallery - Higham test matrices. 2Ha5yaTL  
...... ...... u!N{y,7W)  
h06ku2Q  
〖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。 O gmO&cE  
f]~c)P Cs  
(kTXP_  
2.9.3 指令窗中的 lookfor 指令 $N$ FtpB  
m8+(%>+
7  
【例 2.9.3 -1 】查找包含积分这个关键词的所有指令。 XC15K@K  
VVWM9x  
lookfor integral ANH4IYd3  
ELLIPKE Complete elliptic integral. P];JKE%  
EXPINT Exponential integral function. r^$~>!kZ|  
DBLQUAD Numerically evaluate double integral. F)$K  
INNERLP Used with DBLQUAD to evaluate inner loop of integral. u}9fj  
QUAD Numerically evaluate integral, low order method. SN+S6  
QUAD8 Numerically evaluate integral, higher order method. NCA{H^CL  
COSINT Cosine integral function. |P6EO22p  
SININT Sine integral function. [_y@M ]  
ASSEMA Assembles area integral contributions in a PDE problem. `29TY&p+"  
COSINT Cosine integral function. vd#,DU=p!  
FOURIER Fourier integral transform. BX;5wKfA  
IFOURIER Inverse Fourier integral transform.
_8K%`6!"Z  
SININT Sine integral function.

这真是个好东东啊！！顶

真是好东西啊 eFQQW`J  
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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