Re: Looking to time how long a command takes in mathematica 6 tia

*To*: mathgroup at smc.vnet.net*Subject*: [mg97071] Re: Looking to time how long a command takes in mathematica 6 tia*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Wed, 4 Mar 2009 07:14:19 -0500 (EST)*References*: <goj2i3$2uu$1@smc.vnet.net>

Hi, Set[] is not Equal[] and so you must write "==" instead of "=" and if you end a sub-itnerval with {-2*x^2 + 8*x - 6, 1 = x <= 3} than the next must start with {x^2 - 10*x + 21, 3 < x <= 7} because x==3 is already defined from the previous interval. Play[Piecewise[{{4.000000000*x^2 - 4.000000000*x, 0 <= x <= 1}, {-2*x^2 + 8*x - 6, 1 < x <= 3}, {x^2 - 10*x + 21, 3 < x <= 7}, {-1/2*x^2 + 11*x - 105/2, 7 < x <= 15}, {.5714285714*x^2 - 21.14285714*x + 188.5714286, 15 < x <= 22}, {-.8000000000*x^2 + 39.20000000*x - 475.2000000, 22 < x <= 27}}], {x, 0, 27}] works fine. Regards Jens ratulloch at gmail.com wrote: > Grettings All > > I'm running this command > Play[Piecewise[{{4.000000000*x^2 - 4.000000000*x, > 0 = x <= 1}, {-2*x^2 + 8*x - 6, 1 = x <= 3}, {x^2 - 10*x + 21, > 3 = x <= 7}, {-1/2*x^2 + 11*x - 105/2, > 7 = x <= 15}, {.5714285714*x^2 - 21.14285714*x + 188.5714286, > 15 = x <= 22}, {-.8000000000*x^2 + 39.20000000*x - 475.2000000, > 22 = x <= 27}}], {x, 0, 27}] > > and it's taking extremely long and would like to find out how long it > takes to run this line. Also if anyone has a more efficient way of > using this command please let me know. I'm just trying to output the > wave file to an audio file. > > Aloha > sal2 >