(1). The singular value decomposition leads tot eh polar decomposition: Every operator $A$ can be written as $A=UP$, where $U$ is unitary and $P$ is p...
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其他好文 时间:
2014-11-18 13:20:04
阅读次数:
211
Show that the following statements are equivalent:
(1). $A$ is positive.
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其他好文 时间:
2014-11-18 13:17:56
阅读次数:
186
For any matrix $A$ the series $$\bex \exp A=I+A+\frac{A^2}{2!}+\cdots+\frac{A^n}{n!}+\cdots \eex$$ converges. This is called the exponential of $A$. T...
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其他好文 时间:
2014-11-18 13:14:41
阅读次数:
199
Show that matrices with distinct eigenvalues are dense in the space of all $n\times n$ matrices. (Use the Schur triangularisation)
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其他好文 时间:
2014-11-18 13:12:08
阅读次数:
174
The set of all invertible matrices is a dense open subset of the set of all $n\times n$ matrices. The set of all unitary matrices is a compact subset ...
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其他好文 时间:
2014-11-18 13:09:44
阅读次数:
120
(1). Let $\sed{A_\al}$ be a family of mutually commuting operators. Then, there exists a common Schur basis for $\sed{A_\al}$. In other words, there e...
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其他好文 时间:
2014-11-18 13:08:29
阅读次数:
168
For fixed basis of in $\scrH$ and $\scrK$, the matrix $A^*$ is the conjugate transpose of the matrix of $A$.
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其他好文 时间:
2014-11-18 13:08:12
阅读次数:
195
If $\sen{A}<1$, then $I-A$ is invertible, and $$\bex (I-A)^{-1}=I+A+A^2+\cdots, \eex$$ aa convergent power series. This is called the Neumann series.
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其他好文 时间:
2014-11-18 13:07:47
阅读次数:
151
??
package com.example.scale;
import android.content.Context;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.util.AttributeSet;
import android.util.FloatMath;
im...
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其他好文 时间:
2014-11-17 17:49:19
阅读次数:
149
Android中经常会遇到需要对图片进行缩放及压缩的操作,下面列出3种图片缩放方法:
一.图片缩放
1.inSampleSize(采样率)
优点:效率较高,解析速度快
缺点:采样率inSampleSize的取值只能是2的次方数(例如:inSampleSize=15,实际取值为8;inSampleSize=17,实际取值为16;实际取值会往2的次方结算),因此该方法不能精确的指定图片的大小...
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移动开发 时间:
2014-11-17 15:50:34
阅读次数:
176