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<div class="title">IPERMUTE Array Inverse Permutation Function </div> </div>
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<div class="textblock"><p>Section: <a class="el" href="sec_array.html">Array Generation and Manipulations</a> </p>
<h1><a class="anchor" id="Usage"></a>
Usage</h1>
<p>The <code>ipermute</code> function rearranges the contents of an array according to the inverse of the specified permutation vector. The syntax for its use is </p>
<pre class="fragment"> y = ipermute(x,p)
</pre><p> where <code>p</code> is a permutation vector - i.e., a vector containing the integers <code>1...ndims(x)</code> each occuring exactly once. The resulting array <code>y</code> contains the same data as the array <code>x</code>, but ordered according to the inverse of the given permutation. This function and the <code>permute</code> function are inverses of each other. </p>
<h1><a class="anchor" id="Example"></a>
Example</h1>
<p>First we create a large multi-dimensional array, then permute it and then inverse permute it, to retrieve the original array:</p>
<pre class="fragment">--> A = randn(13,5,7,2);
--> size(A)
ans =
13 5 7 2
--> B = permute(A,[3,4,2,1]);
--> size(B)
ans =
7 2 5 13
--> C = ipermute(B,[3,4,2,1]);
--> size(C)
ans =
13 5 7 2
--> any(A~=C)
ans =
(:,:,1,1) =
0 0 0 0 0
(:,:,2,1) =
0 0 0 0 0
(:,:,3,1) =
0 0 0 0 0
(:,:,4,1) =
0 0 0 0 0
(:,:,5,1) =
0 0 0 0 0
(:,:,6,1) =
0 0 0 0 0
(:,:,7,1) =
0 0 0 0 0
(:,:,1,2) =
0 0 0 0 0
(:,:,2,2) =
0 0 0 0 0
(:,:,3,2) =
0 0 0 0 0
(:,:,4,2) =
0 0 0 0 0
(:,:,5,2) =
0 0 0 0 0
(:,:,6,2) =
0 0 0 0 0
(:,:,7,2) =
0 0 0 0 0
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