Anyone with experience showing graphically, how data flows between

*To*: mathgroup at smc.vnet.net*Subject*: [mg89845] Anyone with experience showing graphically, how data flows between*From*: stephenmck at gmail.com*Date*: Sun, 22 Jun 2008 03:25:04 -0400 (EDT)

Hi, Any suggestions?? I've got two algorithms, the 1st computes the sum the series of input values x(m) times a coefficient over a range N ie. X(k)=Sum[ x(m)*Coeff[i], 0, N ] and another optimised version of the same algorithm where it is defined recursively ie. X(k)=Sum[ x(m)*Coeff[i] + Sum[ x(m)*Coeff[i], 0, N1 ], 0, N2 ] I need to show graphically a call graph or tree structure of the links between each of the operations. The idea is that I want to show how data is passed between operations in the first algoritm (since its essentially a matrix vector multiply) compared to the second. I'm new to mathematica, so was having trouble even getting the algorithm its self to work, but it was recommended to me as the best way to show this graphically. My alternative is to count the index seperation on the summations but not sure this is possible here either. Any help from a pro would be very much welcome as this isn't really my field. Thanks, Stephen *For anyone interested in the context: The first algorithm I want to show is the discrete Fourier transform (DFT) and the second is the more efficient version (FFT). I have designed a variation on the standard FFT with increased data locality between operations and want to show this graphically compared to the standard FFT and the DFT. (I think this should show up well in the tree structure of the operation calls). The transform is implemented in reprogrammable hardware, where short interconnect (from the locality of data from the last operation and where it will be needed for the next operation) between multi core processors is vital to power consumption.