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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>Reshapes an array from one size to another. Two seperate syntaxes are possible. The first syntax specifies the array dimensions as a sequence of scalar dimensions: </p>
<pre class="fragment"> y = reshape(x,d1,d2,...,dn).
</pre><p> The resulting array has the given dimensions, and is filled with the contents of <code>x</code>. The type of <code>y</code> is the same as <code>x</code>.</p>
<p>As a special case, you can specify exactly one of the dimensions as an empty matrix <code>[]</code>, in which case FreeMat will compute the size required in that dimension to make the reshape work. The syntax for this version is </p>
<pre class="fragment"> y = reshape(x,d1,...,da,[],db,...,dn)
</pre><p>The second syntax specifies the array dimensions as a vector, where each element in the vector specifies a dimension length: </p>
<pre class="fragment"> y = reshape(x,[d1,d2,...,dn]).
</pre><p> This syntax is more convenient for calling <code>reshape</code> using a variable for the argument. The <code>reshape</code> function requires that the length of <code>x</code> equal the product of the <code>di</code> values. Note that arrays are stored in column format, which means that elements in <code>x</code> are transferred to the new array <code>y</code> starting with the first column first element, then proceeding to the last element of the first column, then the first element of the second column, etc. </p>
<h1><a class="anchor" id="Example"></a>
Example</h1>
<p>Here are several examples of the use of <code>reshape</code> applied to various arrays. The first example reshapes a row vector into a matrix.</p>
<pre class="fragment">--> a = uint8(1:6)
a =
1 2 3 4 5 6
--> reshape(a,2,3)
ans =
1 3 5
2 4 6
</pre><p>The second example reshapes a longer row vector into a volume with two planes.</p>
<pre class="fragment">--> a = uint8(1:12)
a =
1 2 3 4 5 6 7 8 9 10 11 12
--> reshape(a,[2,3,2])
ans =
(:,:,1) =
1 3 5
2 4 6
(:,:,2) =
7 9 11
8 10 12
</pre><p>The third example reshapes a matrix into another matrix.</p>
<pre class="fragment">--> a = [1,6,7;3,4,2]
a =
1 6 7
3 4 2
--> reshape(a,3,2)
ans =
1 4
3 7
6 2
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