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 Oct 29 comment Plotting discrete time signals involving sumations in matlab. This doesn't completely answer my question. Perhaps you might modify it to address the "X must be same length as Y" error I receive when I attempt a stem plot, i.e; stem(n,f) Oct 29 asked Plotting discrete time signals involving sumations in matlab. May 3 revised Computing P(X+Y>0) for the joint pdf of X and Y. edited title May 3 revised Computing P(X+Y>0) for the joint pdf of X and Y. deleted 2 characters in body May 3 asked Computing P(X+Y>0) for the joint pdf of X and Y. May 1 revised Are these two summations equivalent? edited title May 1 asked Are these two summations equivalent? Apr 15 revised Meaning of the expectation of a conditional variance added 40 characters in body Apr 15 revised Curve to fit points edited body Apr 15 asked Meaning of the expectation of a conditional variance Mar 3 answered Simple probability problems which hide important concepts Nov 13 accepted What is the summation of the following expression? Nov 12 comment What is the summation of the following expression? I'm using this formula $$\sum_{k=1}^{N}ar^{k}=a\left(\frac{1-r^{N}}{1-r}\right)$$ In this case a=1, and r=2 Nov 12 revised What is the summation of the following expression? added 290 characters in body Nov 12 asked What is the summation of the following expression? Oct 5 awarded Scholar Oct 5 awarded Supporter Oct 5 accepted Is the result always n+1? Sep 5 revised Curve to fit points added 118 characters in body Sep 3 awarded Teacher