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 ^|MS2'  
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 25OQY.>bE  
减小字体 增大字体 .JKH=?~\  
+'m9b7+v  
2.9.2 指令窗中的 help 指令 4pL'c@'  
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2.9.2.1 直接使用 help 获得指令的使用说明 bhUE!h<  
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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。 Y^]n>
X  
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help logm gxO~44"  
LOGM Matrix logarithm. ]C^ #)
7  
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. h!wq&Vi4  
cpk\;1&t  
[L,esterr] = logm(A) does not print any warning message, but returns an estimate of the relative residual,norm(expm(L)-A)/norm(A). .gy:Pl]w  
W<q<}RSn  
If A is real symmetric or complex Hermitian, then so is LOGM(A). sO) H#G  
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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. +^9^)Ur|  
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See also EXPM, SQRTM, FUNM. :0@0muo  
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2.9.2.2 使用 help 指令进行分类搜索 &~eCDlX/  
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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。 \8#[AD*@s2  
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help {U-
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HELP topics: w#1BHx  
matlab\general - General purpose commands. N%Bl+7,q  
matlab\ops - Operators and special characters. ~Y43`@3H:  
matlab\lang - Programming language constructs. 6KGT?d  
matlab\elmat - Elementary matrices and matrix manipulation. $x}R2  
matlab\elfun - Elementary math functions. oJM;CN  
matlab\specfun - Specialized math functions. PZ/tkw  
......            ...... T ?Om]:j  
For more help on directory/topic, type "help topic".  2l,>x  
3F,M{'q
 
2.9.2.3 采用 help topic 指令形式获得具体子类的指令明细 6c+29@  
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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。 ot7f?tF2<J  
D;JZ0."  
help elmat iAe"oXK|  
Elementary matrices and matrix manipulation. zji9\  
Elementary matrices. Hva!6vwO%O  
zeros - Zeros array. Yjo$vQi  
ones - Ones array. Y
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...... ...... #_\**%,<  
();Z,A  
Basic array information. #U0| j?!D  
size - Size of matrix. pKXSJ"Xo  
length - Length of vector. 7r,GdP.  
...... ...... 8]&Fu3M^  
],AtR1k  
Matrix manipulation. &H+wzx<  
reshape - Change size. Z^]Oic/0Oa  
diag - Diagonal matrices and diagonals of matrix. H5]q*D2  
...... ...... euY+jc%  
!rgXB(  
Special variables and constants. `Zp*?  
ans - Most recent answer. \Uh/(q7  
eps - Floating point relative accuracy. =?L16mu1&  
...... ...... MuO(%.H  
Qv,ORm h5  
Specialized matrices. FXk*zXn6  
compan - Companion matrix.
Y<^Or  
gallery - Higham test matrices. 8F\'?7  
...... ...... VB^1wm  
gT[]"ZT7  
〖说明〗省略号由笔者所加，用来表示被删除的内容。这样做是出于节省篇幅的考虑。 DB"z93Mr<K  
=Q;dYx%I5  
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2.9.3 指令窗中的 lookfor 指令  Dt5AG  
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【例 2.9.3 -1 】查找包含积分这个关键词的所有指令。 s'/_0  
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lookfor integral 0XE6Hw  
ELLIPKE Complete elliptic integral. X$%[%q8qg  
EXPINT Exponential integral function. XwIHIG}  
DBLQUAD Numerically evaluate double integral. \
xOYa  
INNERLP Used with DBLQUAD to evaluate inner loop of integral. ;|=5)KE  
QUAD Numerically evaluate integral, low order method. /"!ck2d&1  
QUAD8 Numerically evaluate integral, higher order method. Cjt].XR@  
COSINT Cosine integral function. -iy17$  
SININT Sine integral function. ?/3{gOgI$`  
ASSEMA Assembles area integral contributions in a PDE problem. |p/[sD+M  
COSINT Cosine integral function. q%s<y+  
FOURIER Fourier integral transform. DbI)tDi5D  
IFOURIER Inverse Fourier integral transform. JWM4S4yZHR  
SININT Sine integral function.

MATLAB 指令窗中的help指令和lookfor指令 {tXyz[;i1}  
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 )k6z  
减小字体 增大字体 %
&$s0=+  
>{h/4T@  
2.9.2 指令窗中的 help 指令 Ap(>mUs!i  
covK6SH  
2.9.2.1 直接使用 help 获得指令的使用说明 }(UU~V  
om0g'Qa  
【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。 /:w.Zf>B9  
.Nd_p{   
help logm h"
$],=  
LOGM Matrix logarithm. yMe
;  
L = LOGM(A) is the matrix logarithm of A, the inverse of EXPM(A). Complex results are produced if A has negative eigenvalues. A warning message is printed if the computed expm(L) is not close to A. ?Hf8<C}3  
ftqeiZ 2  
[L,esterr] = logm(A) does not print any warning message, but returns an estimate of the relative residual,norm(expm(L)-A)/norm(A). L8$+%Gvo  
8Dc'"3+6  
If A is real symmetric or complex Hermitian, then so is LOGM(A). D7,{p2<2T  
y}>bJ:  
Some matrices, like A = [0 1; 0 0], do not have any logarithms, real or complex, and LOGM cannot be expected to produce one. lDtl6r/  
'_M"yg6d  
See also EXPM, SQRTM, FUNM. 1NU@k6UHl  
!-|{B3"6  
2.9.2.2 使用 help 指令进行分类搜索 $-BM`Zt0;  
uPL|3ACS  
【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。 ,a@jg&Mb]  
Cq%1j[  
help X2C&q$8  
HELP topics: iJEKLv  
matlab\general - General purpose commands. uKpWb1(  
matlab\ops - Operators and special characters. /: }"Zb  
matlab\lang - Programming language constructs. ty)~]!tA  
matlab\elmat - Elementary matrices and matrix manipulation. kiR+ Dsl  
matlab\elfun - Elementary math functions. 6+_qGV  
matlab\specfun - Specialized math functions. =7%c*O <  
......            ...... \XgpwvO".  
For more help on directory/topic, type "help topic". s% (|z  
2mPU /  
2.9.2.3 采用 help topic 指令形式获得具体子类的指令明细 =bl6:  
*gL-v]V  
【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。 Z/[ww8b.  
L3^+`e  
help elmat #bdSH)V  
Elementary matrices and matrix manipulation. ;{K/W.R  
Elementary matrices. "midC(rTm  
zeros - Zeros array. 20k@!BNq  
ones - Ones array. f-l(H="e  
...... ...... 3Ay<2v
  
 Y.v. EZ  
Basic array information. 2:Q2w3Xe  
size - Size of matrix. v?qU/  
length - Length of vector. |qX[Dk  
...... ...... VF] ~J=>i  
<aGfQg|554  
Matrix manipulation. ~jn~M_}K  
reshape - Change size. dhmZ3~cW>  
diag - Diagonal matrices and diagonals of matrix. `_5{: 9N$  
...... ...... e?)ic\K  
^+'\ u;\  
Special variables and constants. ?*2Uw{~}  
ans - Most recent answer. &Uu8wFbIJ  
eps - Floating point relative accuracy. ubQZTAx  
...... ...... We*&\e+"T  
%cFqD &6  
Specialized matrices. iF'qaqHWY4  
compan - Companion matrix.  Oa/#2C~  
gallery - Higham test matrices. 1o%E(*M4I  
...... ...... [BzwQ 4  
UbSAyf  
〖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。 qD<\U  
]B3\IT  
>7I"_#x1:  
2.9.3 指令窗中的 lookfor 指令 68-2EWq  
y?@(%PTp  
【例 2.9.3 -1 】查找包含积分这个关键词的所有指令。 d\A!5/LG  
x|`o7.  
lookfor integral hqVxvS"  
ELLIPKE Complete elliptic integral. we;QrS(Hi  
EXPINT Exponential integral function. <maYS2  
DBLQUAD Numerically evaluate double integral. 2u?k;"]V  
INNERLP Used with DBLQUAD to evaluate inner loop of integral. A~MIFr/8  
QUAD Numerically evaluate integral, low order method. Hklgf  
QUAD8 Numerically evaluate integral, higher order method. iW,fKXuo&y  
COSINT Cosine integral function. OX[
pK_:`l  
SININT Sine integral function. , UiA?7k  
ASSEMA Assembles area integral contributions in a PDE problem. 0s'H(qE,_  
COSINT Cosine integral function. 1xzOD@=dI  
FOURIER Fourier integral transform. TZYz`l+v  
IFOURIER Inverse Fourier integral transform. rwSmdJ~  
SININT Sine integral function.

这真是个好东东啊！！顶

真是好东西啊 LL"c 9jb4z  
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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