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 -:cS}I  
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 v?n`kw  
减小字体 增大字体 ]n\WCU]0  
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2.9.2 指令窗中的 help 指令 t<}'/ )  
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2.9.2.1 直接使用 help 获得指令的使用说明 Nki18ud#  
6SlE>b9tA  
【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!_D M^3  
T?^AllUZQR  
help logm aW4tJN%!  
LOGM Matrix logarithm. zO9|s}J8q  
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. WO^smCk  
9"_qa q  
[L,esterr] = logm(A) does not print any warning message, but returns an estimate of the relative residual,norm(expm(L)-A)/norm(A). = J).(E89  
t
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If A is real symmetric or complex Hermitian, then so is LOGM(A). "p2 $R*ie  
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Some matrices, like A = [0 1; 0 0], do not have any logarithms, real or complex, and LOGM cannot be expected to produce one. PFUb\AY  
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See also EXPM, SQRTM, FUNM. ?VS {,"X  
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2.9.2.2 使用 help 指令进行分类搜索 REnRpp$  
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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。 (3{'GX2c  
eey <:n/Z  
help J>]' {!+  
HELP topics: {5^'u^E  
matlab\general - General purpose commands. /$&~0pk  
matlab\ops - Operators and special characters. TBrAYEk  
matlab\lang - Programming language constructs. 06 K8|K  
matlab\elmat - Elementary matrices and matrix manipulation. ` n@[=l~  
matlab\elfun - Elementary math functions. `H+ 7Hj  
matlab\specfun - Specialized math functions. Q*(]&qr"E  
......            ...... CHN!o9f  
For more help on directory/topic, type "help topic". ,^:Zf|V  
#x)G2T'?  
2.9.2.3 采用 help topic 指令形式获得具体子类的指令明细 (RWZ[-;)  
;wJLH\/  
【例 2.9.2 .3-1 】如果用户想知道有关矩阵操作指令一栏表，那末就运行以下指令。 m*CIbkDsZ  
[UR+G8X21m  
help elmat 5}e-\:J>B  
Elementary matrices and matrix manipulation. !ny;YV  
Elementary matrices. A}OV>yM  
zeros - Zeros array. +=$]fjE?  
ones - Ones array. r7JILk  
...... ...... JWlH(-U4|  
8Tt2T} Y  
Basic array information. dZ`nv[]k~  
size - Size of matrix. UFouIS#L  
length - Length of vector. ?n\~&n'C  
...... ...... @<W"$_r-  
V1x
pJ  
Matrix manipulation. &=X1kQG  
reshape - Change size. &"Ua"H)  
diag - Diagonal matrices and diagonals of matrix. K)l{3\9l|  
...... ...... +CX2W(
'  
 ItC*[  
Special variables and constants. H Y.,f_m  
ans - Most recent answer. 2Z7smDJ  
eps - Floating point relative accuracy. JNuo+Pq  
...... ...... 1g2%f9G  
(gl CTF9v  
Specialized matrices. `^wF]R  
compan - Companion matrix. /V2I
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gallery - Higham test matrices. 3!Gnc0%c  
...... ...... n*9)Y~  
Z'/:  
〖说明〗省略号由笔者所加，用来表示被删除的内容。这样做是出于节省篇幅的考虑。 ]Yp;8#:1  
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2.9.3 指令窗中的 lookfor 指令 :&/'rMi<T  
#:v|/2  
【例 2.9.3 -1 】查找包含积分这个关键词的所有指令。 w=rh@S]  
=CFO
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lookfor integral >IJH#>i  
ELLIPKE Complete elliptic integral. {qp XzxV  
EXPINT Exponential integral function. 8)\ ?6C  
DBLQUAD Numerically evaluate double integral. :;#^h]Q  
INNERLP Used with DBLQUAD to evaluate inner loop of integral. `$AX!,<!G  
QUAD Numerically evaluate integral, low order method. 7Fh%jRHZ`  
QUAD8 Numerically evaluate integral, higher order method. T5=3 jPQ  
COSINT Cosine integral function. @v2_gjRe  
SININT Sine integral function. N*f?A$u/I  
ASSEMA Assembles area integral contributions in a PDE problem. pyq~_
Bng  
COSINT Cosine integral function. cDYKvrPY  
FOURIER Fourier integral transform. %S. _3`A  
IFOURIER Inverse Fourier integral transform. ol^OvG:TQ  
SININT Sine integral function.

MATLAB 指令窗中的help指令和lookfor指令 h64<F3}  
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 \}P3mS"e3  
减小字体 增大字体 &G\Vn,1v  
X4_1kY;  
2.9.2 指令窗中的 help 指令 $Ypt /`  
$M5iU@A  
2.9.2.1 直接使用 help 获得指令的使用说明 ]0p] u d&  
E#[_"^n  
【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。 a> qB k})  
.;}vp*  
help logm UCV1{  
LOGM Matrix logarithm. !0!m |^c5  
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. $ha,DlN  
3V=wW{;x  
[L,esterr] = logm(A) does not print any warning message, but returns an estimate of the relative residual,norm(expm(L)-A)/norm(A). >!sxX = <  
h*d1G9%Q1  
If A is real symmetric or complex Hermitian, then so is LOGM(A). ~ES6Qw`Oe  
yw
Q[>itMa  
Some matrices, like A = [0 1; 0 0], do not have any logarithms, real or complex, and LOGM cannot be expected to produce one. e0;0X7  

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See also EXPM, SQRTM, FUNM. ;O8'vp  
O/Cwm;&t  
2.9.2.2 使用 help 指令进行分类搜索 CoZOKRoaH  
^%ZbjJ7|j  
【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。 IJ\4S  
q>|&u  
help uaghB,i'n  
HELP topics: #djby}hi  
matlab\general - General purpose commands. m&vuBb3  
matlab\ops - Operators and special characters. '^B[Krs'Z`  
matlab\lang - Programming language constructs. Cq8.^=}_  
matlab\elmat - Elementary matrices and matrix manipulation. O{^8dwg  
matlab\elfun - Elementary math functions. D8X~qt/  
matlab\specfun - Specialized math functions. 3Gi^TXE]  
......            ...... (%~^Kmfb0  
For more help on directory/topic, type "help topic". Gk:tT1  
f|f)Kys%5  
2.9.2.3 采用 help topic 指令形式获得具体子类的指令明细 |ht:_l 8  
pLj[b4p9  
【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。 o-I:p$B-  
+2xgMN6B@  
help elmat g$f+X~Q  
Elementary matrices and matrix manipulation. BK 3oNDy  
Elementary matrices. ES,T[
 
zeros - Zeros array. 59Lc-JJ  
ones - Ones array. Y%9$!  
...... ...... B']-4X{SGa  
.fFXH  
Basic array information. &?g!)O  
size - Size of matrix. $Mg[e*ct  
length - Length of vector. E<RPMd @a  
...... ...... ^+p7\D/E(  
Mh"X9-Ot  
Matrix manipulation. 6mV-+CnYC  
reshape - Change size. /U26IbJ  
diag - Diagonal matrices and diagonals of matrix. 6|uv+$  
...... ...... 6}l[%8  
+~(SeTY
 
Special variables and constants. ~aPe?{yIUa  
ans - Most recent answer. <*Nd%C
a  
eps - Floating point relative accuracy. &NKb},~  
...... ...... 5o6X.sC8e  
mqtX7rej  
Specialized matrices. ]f{3_M[  
compan - Companion matrix. -w"$[XP  
gallery - Higham test matrices. 4mjlat(d  
...... ...... ]sTbEw.[  
s<>d&W 0=  
〖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。 po\(O8#5U  
`=V p 0tPI  
EDT9O  
2.9.3 指令窗中的 lookfor 指令 /q,vQ[R/  
5G2G<[p5oQ  
【例 2.9.3 -1 】查找包含积分这个关键词的所有指令。 j*\oK@  
40%fOu,u`  
lookfor integral qxB|*P`  
ELLIPKE Complete elliptic integral. =(+]ee!Ti  
EXPINT Exponential integral function. / 3eGt7x#  
DBLQUAD Numerically evaluate double integral. !\VzX  
INNERLP Used with DBLQUAD to evaluate inner loop of integral. x(n|zp ("  
QUAD Numerically evaluate integral, low order method. C
(8VXtx_  
QUAD8 Numerically evaluate integral, higher order method. O^J=19Ri  
COSINT Cosine integral function. d.|*sZ&3p  
SININT Sine integral function. dbJ3E)rF  
ASSEMA Assembles area integral contributions in a PDE problem. 3xk_ZK82  
COSINT Cosine integral function. 4VF4
8  
FOURIER Fourier integral transform. /!?b&N/d)  
IFOURIER Inverse Fourier integral transform. cJerYRjsL  
SININT Sine integral function.

这真是个好东东啊！！顶

真是好东西啊 JH| D  
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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