I forgot the code in the last post:
def li(z): #def log integral for real and complex variables
if z in RR and z >= 2: #check if real number greater than 2
return Li(z) +
1.04516378011749278484459194613136522615578151 #adjust for offset
in SAGE def
elif z == 0:
return 0
I made a few modifications so it now works everywhere but (0,1)
On Jun 11, 1:45 pm, "William Stein" <[EMAIL PROTECTED]> wrote:
> On Wed, Jun 11, 2008 at 8:07 AM, M. Yurko <[EMAIL PROTECTED]> wrote:
>
> > O.K. I defined li(x) as follows:
>
> > def li(z): #def log integral for real and complex vari
On Wed, Jun 11, 2008 at 8:07 AM, M. Yurko <[EMAIL PROTECTED]> wrote:
>
> O.K. I defined li(x) as follows:
>
> def li(z): #def log integral for real and complex variables
>if z in RR and z >= 2: #check if real number greater than 2
>return Li(z) +
> 1.0451637801174927848445919461313
O.K. I defined li(x) as follows:
def li(z): #def log integral for real and complex variables
if z in RR and z >= 2: #check if real number greater than 2
return Li(z) +
1.04516378011749278484459194613136522615578151 #adjust for offset
in SAGE def
elif z == 1:
return -in
O.K. I defined li(x) as follows:
def li(z): #def log integral for real and complex variables
if z in RR and z >= 2: #check if real number greater than 2
return Li(z) +
1.04516378011749278484459194613136522615578151 #adjust for offset
in SAGE def
elif z == 1:
return -in
Sure. My current code is a bit messy, so I'll clean it up and make an
example. However, one thing to note is that I defined my Li(x)
starting from 0 ("American" convention), while the current Li(x) in
SAGE (for positive reals) is defined starting at 2 ("offset").
On Jun 10, 11:02 pm, "William Ste
On Tue, Jun 10, 2008 at 7:50 PM, M. Yurko <[EMAIL PROTECTED]> wrote:
>
> Thanks again to everyone who tried to assist me. I was able to use the
> incomplete gamma function already in sage to compute Li(x) for complex
> inputs. For the speed that I need this works fine. However, this
> should be im
Thanks again to everyone who tried to assist me. I was able to use the
incomplete gamma function already in sage to compute Li(x) for complex
inputs. For the speed that I need this works fine. However, this
should be impetus for me to try and learn Cython.
On Jun 10, 8:04 pm, "William Stein" <[EM
On Tue, Jun 10, 2008 at 3:49 PM, Robert Bradshaw
<[EMAIL PROTECTED]> wrote:
>
> Just for a start, try looking in sage/interfaces for several
> examples. You could also try wrapping it in Cython (though this is
> sometimes a bit harder with C++ than with C).
I don't think there is any command line
Just for a start, try looking in sage/interfaces for several
examples. You could also try wrapping it in Cython (though this is
sometimes a bit harder with C++ than with C).
- Robert
On Jun 10, 2008, at 7:35 AM, M. Yurko wrote:
> After a little more searching, it appears that I should use a
After a little more searching, it appears that I should use a Pseudo
tty( right?). However, the programming guide gives no information on
how to actually do this. Any help would be greatly appreciated
(copying and pasting input and output is less than ideal).
On Jun 10, 10:15 am, "M. Yurko" <[EMA
Mike, thanks for the code. This is just what I need and works well
from the command line. However, I'm a bit of a SAGE and linux newbie
and I'm unsure about the best way of integrating this with SAGE. I
checked the programming guide, but I only have some basic Python
experience and have never done
My package has routines for the incomplete gamma function, and the
logarithmic
integral is a special case of that. For the incomplete gamma function
I use a
combination of series, asumptotics, and continued fractions. The
relevant file
is Lgamma.h in the include directory of my L-function packag
On Sat, Jun 7, 2008 at 12:54 PM, M. Yurko <[EMAIL PROTECTED]> wrote:
>
> Is there any way for SAGE to calculate Li(x) (logarithmic integral)
> for complex inputs?
I don't think that functionality is directly exposed in Sage in any easy
to use way. I've cc'd Mike Rubinstein who has probably writt
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