David Skulsky
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 Mar20 awarded Good Question Feb13 awarded Notable Question Feb4 awarded Enlightened Feb4 awarded Nice Answer Jan24 comment Solving a linear system The first equation in Solve does not exactly match the OP's equation (40-->4), so the posted result is not correct. Jan22 comment Coloring the points in a ListPlot with the value of another function Related question: mathematica.stackexchange.com/questions/1300/… Jan17 awarded Yearling Jan14 answered How to solve an equation with two variables in Mathematica Dec17 revised Find the best parallel lines to a given data set Removed parallel tag. Dec16 revised How to find the area between two curves Corrected minor syntax error Dec16 comment First 10 digits of $\pi$ without rounding 3.141592653 :-) Dec8 answered Finding the square root of a squared number? Dec2 revised How to improve the performance of this code added 1201 characters in body Dec2 comment How to improve the performance of this code I also forced innerInt to only accept numeric quantities and I set it running, but I have no idea what a "reasonable" amount of execution time is. It's going now... Dec1 answered How to improve the performance of this code Nov22 comment Integrate perfomance I don't know why it's slower, but if this is a calculation you perform more than once, you may benefit by storing the results (i.e., use b[i_]:=b[i]=integral). Nov22 comment How to insert trigonometric functions into matrices' vector components? I'm still confused because A.x represents the matrix/vector multiplication of A and x, which in your example would result in {2 Sin[phi],4}, but it seems you want the first term replaced with Sin[2]. Is that correct? Nov22 comment How to insert trigonometric functions into matrices' vector components? Does phi have a value? Are you trying to use it as an argument. Sorry, but I guess I still don't understand. Nov22 answered How to insert trigonometric functions into matrices' vector components? Nov19 comment when using FileDate----The Creation date of a file is not available on Macintosh and Unix? I can confirm that Mathematica returns a file date creation on my Mac (OS X 10.8.5, MMA v9.0.1).