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
>