blocks|key|1515476|text|memcpy怎么样？|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1515477|#include+<string.h>

memcpy(destArray,+sourceArray,+arrayLength+*+sizeof(float));|code-block|syntax|javascript|1515478|entityMap|0|LINK|mutability|MUTABLE|url|http://pubs.opengroup.org/onlinepubs/009695399/functions/memcpy.html^0|0|6|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

How about <a href="http://pubs.opengroup.org/onlinepubs/009695399/functions/memcpy.html">memcpy</a>?

<pre><code>#include &lt;string.h&gt;

memcpy(destArray, sourceArray, arrayLength * sizeof(float));
</code></pre>

blocks|key|5348566|text|如果您愿意使用Accelerate的BLAS部分，Jeff+Biggus将cblas_scopy()评为比memcpy()更快。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5348567|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/ios/#documentation/Accelerate/Reference/BLAS_Ref/Reference/reference.html#//apple_ref/doc/uid/TP30000414-SW25^0|11|D|1H|8|11|D|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

If you're willing to use the BLAS portion of Accelerate, Jeff Biggus has benchmarked <a href="https://developer.apple.com/library/ios/#documentation/Accelerate/Reference/BLAS_Ref/Reference/reference.html#//apple_ref/doc/uid/TP30000414-SW25"><code>cblas_scopy()</code></a> as being faster than even <code>memcpy()</code>.

blocks|key|1515504|text|我可以想出比vDSP_vsmul()更糟糕的方法；你也可以做vvcopysign()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1515505|entityMap^0|6|C|U|C|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I could think of a lot worse ways that <code>vDSP_vsmul()</code>; you could also do <code>vvcopysign()</code>.

blocks|key|5348619|text|您可以使用vDSP_vclr和vDSP_vadd，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5348620|int+sourceLength+=+3;
float*+source+=+(float*)malloc(sourceLength+*+sizeof(float));
//+source+is+filled+with+data,+let's+say+[5,+5,+5]

int+destinationLength+=+10;
float*+destination+=+(float*)malloc(destinationLength+*+sizeof(float));
//+destination+is+filled+with+ones+so+[1,+1,+1,+1,+1,+1,+1,+1,+1,+1]

//+Prepare+the+destination+array+to+receive+the+source+array
//+by+setting+its+values+to+0+in+the+range+[initialIndex,+initialIndex+%2B+N-1]
int+initialIndex+=+2;
vDSP_vclr((destination%2BinitialIndex),+1,+sourceLength);

//+We+add+source[0,+N-1]+into+destination[initialIndex,+initialIndex+%2B+N-1]
vDSP_vadd(source,+1,+(destination%2BinitialIndex),+1,+(destination%2BinitialIndex),+1,+sourceLength);|code-block|syntax|javascript|5348621|或者更简洁地说，你也可以像布拉德·拉森说的那样使用'cblas_scopy‘|5348622|//+Init+source+and+destination
//+We+copy+source[0,+sourceLength]+into+destination[initialIndex,+initialIndex+%2B+sourceLength]
cblas_scopy(sourceLength,+source,+1,+(destination%2BinitialIndex),+1);|5348623|entityMap^0|5|9|F|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

You could use <code>vDSP_vclr</code> and <code>vDSP_vadd</code> as follow:

<pre><code>int sourceLength = 3;
float* source = (float*)malloc(sourceLength * sizeof(float));
// source is filled with data, let's say [5, 5, 5]

int destinationLength = 10;
float* destination = (float*)malloc(destinationLength * sizeof(float));
// destination is filled with ones so [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]

// Prepare the destination array to receive the source array
// by setting its values to 0 in the range [initialIndex, initialIndex + N-1]
int initialIndex = 2;
vDSP_vclr((destination+initialIndex), 1, sourceLength);

// We add source[0, N-1] into destination[initialIndex, initialIndex + N-1]
vDSP_vadd(source, 1, (destination+initialIndex), 1, (destination+initialIndex), 1, sourceLength);
</code></pre>

Or more concise you could also use 'cblas_scopy' as Brad Larson said

<pre><code>// Init source and destination
// We copy source[0, sourceLength] into destination[initialIndex, initialIndex + sourceLength]
cblas_scopy(sourceLength, source, 1, (destination+initialIndex), 1);
</code></pre>

blocks|key|1515618|text|我认为这是最好的复制方式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1515619|将一个子矩阵的内容复制到另一个子矩阵；单精度。https://developer.apple.com/documentation/accelerate/1449950-vdsp_mmov|offset|length|1515620|func+vDSP_mmov(_+__A:+UnsafePointer<Float>,+
+++++++++++++_+__C:+UnsafeMutablePointer<Float>,+
+++++++++++++_+__M:+vDSP_Length,+
+++++++++++++_+__N:+vDSP_Length,+
+++++++++++++_+__TA:+vDSP_Length,+
+++++++++++++_+__TC:+vDSP_Length)|code-block|syntax|javascript|1515621|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/documentation/accelerate/1449950-vdsp_mmov^0|0|N|1Y|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I think this is the best way to copy.

Copies the contents of a submatrix to another submatrix; single precision. <a href="https://developer.apple.com/documentation/accelerate/1449950-vdsp_mmov" rel="nofollow noreferrer">https://developer.apple.com/documentation/accelerate/1449950-vdsp_mmov</a>

<pre><code>func vDSP_mmov(_ __A: UnsafePointer&lt;Float&gt;, 
 _ __C: UnsafeMutablePointer&lt;Float&gt;, 
 _ __M: vDSP_Length, 
 _ __N: vDSP_Length, 
 _ __TA: vDSP_Length, 
 _ __TC: vDSP_Length)
</code></pre>

I'm using the accelerate framework to optimize my DSP code. There are several times when I want to copy the contents of one array (or portion of an array) to another.

I can't seem to find an appropriate function to do this, so instead I've been doing something kind of silly, which is to multiply the array by 1 (or add 0) and get the copy that way. 

<pre><code>float one = 1;

float sourceArray = new float[arrayLength];
/////....sourceArray is filled up with data

float destArray = new float[arrayLength];

vDSP_vsmul(sourceArray, 1, &amp;one, destArray, 1, arrayLength);
</code></pre>

there has to be a better way to do this!? Thanks!

Copying Array Contents with vDSP

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在使用加速框架来优化我的DSP代码。有几次，我想将一个数组(或数组的一部分)的内容复制到另一个数组中。我似乎找不到合适的函数来做这件事，所以我一直在做一些愚蠢的事情，那就是将数组乘以1(或加0)，然后以这种方式获得副本。float one = 1;float sourceArray = new float[arrayLength];/////....sourceArray is filled 

问使用vDSP复制数组内容
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