integrating existing python script into sage

[vivek]

Hi

I know of a python script by name qasm2circ (http://www.media.mit.edu/
quanta/qasm2circ/).

This script takes a description of a quantum-circuit (called a QASM
file) and converts it into a graphical depiction. This is done using
latex (specifically xypic) to produce high-quality output in epsf,
pdf, or png formats.

However, I want to integrate this script with sage, so that I can draw
the figures right in the sage notebook like I draw other 2d or 3d
plots.

I would deeply thankful if someone gives me some hint, about how I can
go about doing this.

Thanking you.

[William Stein]

I'll do this. Give me a minute.

William

[William Stein]

On Mon, Dec 22, 2008 at 9:55 PM, vivek <freewi...@gmail.com> wrote:
>

OK, so I've done this.

1. I've attached a screenshot of using what I've done from the sage
notebook. I've published the relevant worksheet with examples here:

http://sagenb.org/home/pub/118/

I've also pasted the text version of this worksheet below. I've
installed qasm-1.4 into sagenb.org, so if you go there you can just
use it.

2. To use qasm from Sage, you have to install the optional qasm spkg.
You can do this by typing

sage -i qasm-1.4

I've also attached the qasm-1.4 spkg to this email, though you can
ignore that. It's tiny, by the way (only 15K). It's very important
that you have latex installed of course, or qasm won't work.

That's it. Let me know if you have any problems.

qasm
system:sage

{{{id=0|
from qasm import qasm
///
}}}

{{{id=4|
qasm("""
qubit q0
qubit q1

h q0 # create EPR pair
cnot q0,q1
""")
///
}}}

{{{id=1|
%qasm

def c-S,1,'S'
def c-T,1,'T'

qubit j0
qubit j1
qubit j2

h j0
c-S j1,j0
c-T j2,j0
nop j1
nop j2
h j1
c-S j2,j1
h j2
swap j0,j2
///
}}}

{{{id=2|
%qasm

#
# File: test9.qasm
# Date: 22-Mar-04
# Author: I. Chuang
#
# Sample qasm input file - two-qubit gate circuit
# implementation of Toffoli

def c-X,1,'\sqrt{X}'
def c-Xd,1,'{\sqrt{X}}^\dagger'

qubit q0
qubit q1
qubit q2

c-X q1,q2
cnot q0,q1
c-Xd q1,q2
cnot q0,q1
c-X q0,q2
///
}}}

[vivek]

Hi

Thanks a lot for your prompt reply.

But I wasn't able to install qasm spkg.
I tried the following
(1) attempted to install dvipng package, i couldn't install it as
well.
(2) attempted to install after sage -sh
but both failed.

Please find below the install-log report

qasm-1.4
Machine:
Linux freewill 2.6.18-6-686 #1 SMP Tue Jun 17 21:31:27 UTC 2008 i686
GNU/Linux
Deleting directories from past builds of previous/current versions of
qasm-1.4
Extracting package /home/ram/sage/qasm-1.4.spkg ...
-rwxr-xr-x 1 ram ram 14572 2008-12-23 19:21 /home/ram/sage/
qasm-1.4.spkg
qasm-1.4/
qasm-1.4/setup.py
qasm-1.4/qasm/
qasm-1.4/qasm/qasm.py
qasm-1.4/qasm/__init__.py
qasm-1.4/SPKG.txt
qasm-1.4/.hgignore
qasm-1.4/.hg/
qasm-1.4/.hg/dirstate
qasm-1.4/.hg/store/
qasm-1.4/.hg/store/00changelog.i
qasm-1.4/.hg/store/00manifest.i
qasm-1.4/.hg/store/undo
qasm-1.4/.hg/store/data/
qasm-1.4/.hg/store/data/qasm/
qasm-1.4/.hg/store/data/qasm/____init____.py.i
qasm-1.4/.hg/store/data/qasm/qasm.py.i
qasm-1.4/.hg/store/data/_s_p_k_g.txt.i
qasm-1.4/.hg/store/data/.hgignore.i
qasm-1.4/.hg/store/data/spkg-install.i
qasm-1.4/.hg/store/data/setup.py.i
qasm-1.4/.hg/00changelog.i
qasm-1.4/.hg/undo.dirstate
qasm-1.4/.hg/requires
qasm-1.4/spkg-install
qasm-1.4/src/
qasm-1.4/src/CHANGES
qasm-1.4/src/qasm2tex.py
qasm-1.4/src/xyqcirc.tex
qasm-1.4/src/README
Finished extraction
****************************************************
Host system
uname -a:
Linux freewill 2.6.18-6-686 #1 SMP Tue Jun 17 21:31:27 UTC 2008 i686
GNU/Linux
****************************************************
****************************************************
GCC Version
gcc -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --enable-languages=c,c+
+,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-
system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-
threads=posix --enable-nls --program-suffix=-4.1 --enable-__cxa_atexit
--enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --with-
tune=i686 --enable-checking=release i486-linux-gnu
Thread model: posix
gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
****************************************************
You must make sure the dvipng program is available on your system.
You might be able to install the dvipng program listed in the
output of 'sage -optional'. If that doesn't work, just use whatever
is offered by your operating system.

real 0m0.011s
user 0m0.000s
sys 0m0.012s
sage: An error occurred while installing qasm-1.4
Please email sage-devel http://groups.google.com/group/sage-devel
explaining the problem and send the relevant part of
of /home/ram/sage/sage-3.1.4/install.log. Describe your computer,
operating system, etc.
If you want to try to fix the problem, yourself *don't* just cd to
/home/ram/sage/sage-3.1.4/spkg/build/qasm-1.4 and type 'make'.
Instead type "/home/ram/sage/sage-3.1.4/sage -sh"
in order to set all environment variables correctly, then cd to
/home/ram/sage/sage-3.1.4/spkg/build/qasm-1.4
(When you are done debugging, you can type "exit" to leave the
subshell.)

Kindly help me to resolve this issue.

Thanking you.


On Dec 23, 12:36 pm, "William Stein" <wst...@gmail.com> wrote:

>  Picture 2.png
> 81KViewDownload
>
>  qasm-1.4.spkg
> 19KViewDownload

[William Stein]

On Tue, Dec 23, 2008 at 10:04 PM, vivek <freewi...@gmail.com> wrote:
>
> Hi
>
> Thanks a lot for your prompt reply.
>
> But I wasn't able to install qasm spkg.
> I tried the following
> (1) attempted to install dvipng package, i couldn't install it as
> well.

Do not install that dvipng spkg. You *MUST* install dvipng instead
using whatever method your operating system provides (e.g., rpm, deb,
etc.). It's a completely standard linux program. The Sage dvipng
spkg will be deleted soon, since it doesn't make sense for us to be
hosting it.

-- William

--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org

[vivek]

Thanks a lot Mr. Stein.
Finally, I could successfully integrate it with my existing
installation.

On Dec 24, 12:04 pm, "William Stein" <wst...@gmail.com> wrote:

> > Please email sage-develhttp://groups.google.com/group/sage-devel