Re: [Numpy-discussion] speeding up the following expression

2011-11-12 Thread josef . pktd
On Sat, Nov 12, 2011 at 3:36 AM, Geoffrey Zhu zyzhu2...@gmail.com wrote: Hi, I am playing with multiple ways to speed up the following expression (it is in the inner loop): C[1:(M - 1)]=(a * C[2:] + b * C[1:(M-1)] + c * C[:(M-2)]) where C is an array of about 200-300 elements, M=len(C),

Re: [Numpy-discussion] speeding up the following expression

2011-11-12 Thread Warren Weckesser
On Sat, Nov 12, 2011 at 6:43 AM, josef.p...@gmail.com wrote: On Sat, Nov 12, 2011 at 3:36 AM, Geoffrey Zhu zyzhu2...@gmail.com wrote: Hi, I am playing with multiple ways to speed up the following expression (it is in the inner loop): C[1:(M - 1)]=(a * C[2:] + b * C[1:(M-1)] + c *

Re: [Numpy-discussion] speeding up the following expression

2011-11-12 Thread josef . pktd
On Sat, Nov 12, 2011 at 10:31 AM, Warren Weckesser warren.weckes...@enthought.com wrote: On Sat, Nov 12, 2011 at 6:43 AM, josef.p...@gmail.com wrote: On Sat, Nov 12, 2011 at 3:36 AM, Geoffrey Zhu zyzhu2...@gmail.com wrote: Hi, I am playing with multiple ways to speed up the following

Re: [Numpy-discussion] speeding up the following expression

2011-11-12 Thread Warren Weckesser
On Sat, Nov 12, 2011 at 9:59 AM, josef.p...@gmail.com wrote: On Sat, Nov 12, 2011 at 10:31 AM, Warren Weckesser warren.weckes...@enthought.com wrote: On Sat, Nov 12, 2011 at 6:43 AM, josef.p...@gmail.com wrote: On Sat, Nov 12, 2011 at 3:36 AM, Geoffrey Zhu zyzhu2...@gmail.com wrote:

Re: [Numpy-discussion] speeding up the following expression

2011-11-12 Thread josef . pktd
On Sat, Nov 12, 2011 at 11:32 AM, Warren Weckesser warren.weckes...@enthought.com wrote: On Sat, Nov 12, 2011 at 9:59 AM, josef.p...@gmail.com wrote: On Sat, Nov 12, 2011 at 10:31 AM, Warren Weckesser warren.weckes...@enthought.com wrote: On Sat, Nov 12, 2011 at 6:43 AM,

Re: [Numpy-discussion] speeding up the following expression

2011-11-12 Thread Warren Weckesser
On Sat, Nov 12, 2011 at 11:16 AM, josef.p...@gmail.com wrote: On Sat, Nov 12, 2011 at 11:32 AM, Warren Weckesser warren.weckes...@enthought.com wrote: On Sat, Nov 12, 2011 at 9:59 AM, josef.p...@gmail.com wrote: On Sat, Nov 12, 2011 at 10:31 AM, Warren Weckesser

Re: [Numpy-discussion] speeding up the following expression

2011-11-12 Thread Geoffrey Zhu
Hi Warren, On Sat, Nov 12, 2011 at 9:31 AM, Warren Weckesser warren.weckes...@enthought.com wrote: On Sat, Nov 12, 2011 at 6:43 AM, josef.p...@gmail.com wrote: On Sat, Nov 12, 2011 at 3:36 AM, Geoffrey Zhu zyzhu2...@gmail.com wrote: Hi, I am playing with multiple ways to speed up the

[Numpy-discussion] Odd-looking long double on windows 32 bit

2011-11-12 Thread Matthew Brett
Hi, Sorry for my continued confusion here. This is numpy 1.6.1 on windows XP 32 bit. In [2]: np.finfo(np.float96).nmant Out[2]: 52 In [3]: np.finfo(np.float96).nexp Out[3]: 15 In [4]: np.finfo(np.float64).nmant Out[4]: 52 In [5]: np.finfo(np.float64).nexp Out[5]: 11 If there are 52 bits of

Re: [Numpy-discussion] Odd-looking long double on windows 32 bit

2011-11-12 Thread Matthew Brett
Hi, On Sat, Nov 12, 2011 at 11:35 PM, Matthew Brett matthew.br...@gmail.com wrote: Hi, Sorry for my continued confusion here.  This is numpy 1.6.1 on windows XP 32 bit. In [2]: np.finfo(np.float96).nmant Out[2]: 52 In [3]: np.finfo(np.float96).nexp Out[3]: 15 In [4]: