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PO1D FFT transform of 2D array in CUDA
 

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  1. PO1D FFT transform of 2D array in CUDA
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    <p>I want to do 1-D FFT of a 2-D array (say along columns only). I am using vs2010/C# with managedcuda.</p> <p>I am having some problems:</p> <ol> <li><p>How to I make a 2-D CudaDeviceVariable? I tried:</p> <pre><code> int n1 = 10; int n2 = 2; int batch = 1; //SizeT test; CudaDeviceVariable&lt;double&gt;[,] datad; datad = new CudaDeviceVariable&lt;double&gt;[n1, n2]; </code></pre></li> </ol> <p>But <code>datad</code> is not a <code>CudaDeviceVariable</code>. Its a normal 2-D array now. So I can't allocate memory in device. Like: </p> <pre><code> double[,] data11 = new double[,] {{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 },{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }}; datad.CopyToDevice(data11);//Error?? </code></pre> <p>It is an error because <code>CopyToDevice</code> is not a method for <code>System.Array</code>. If I make <code>datad</code> a <code>n1*n2</code> <code>CudaDeviceVariable</code>, error is still there because <code>CopyToDevice</code> takes <code>double[]</code> as input argument, not <code>[,].</code> Above method works for 1-D arrays. </p> <p>2.is it possible to do 1-D FFT of a large 1-D array. For example, I make 1-D array from <code>data11</code>. And then perform FFT in parts of 10 elements? <code>CudaFFTPlanMany</code> has some options but I am not 100% clear how to use them or how can they be useful to me.</p> <p>Please ask more details if I am not clear. Thanks a lot. </p> <p>EDIT: I got some more details, question still remains, but I made 1-D array of <code>data11</code>, and then performed batched fft, in 2 batches of size 10. It gave me results what I wanted. Syntax is:</p> <pre><code> CudaFFTPlanMany planm; planm = new CudaFFTPlanMany(1, n, 1,cufftType.D2Z); </code></pre> <p>Cheers </p>
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