Nugroho's blog.: mac

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Showing posts with label mac. Show all posts
Showing posts with label mac. Show all posts

## Monday, December 12, 2011

### Lorenz Attractor using Python 2.7 and Vpython Module on Mac OS X Lion

 From Blogsy Photos
Lorenz attractor's generated by three nonlinear simultaneous equation.

x1=x0+h*a*(y0-x0)
y1=y0+h*(x0*(b-z0)-y0)
z1=z0+h*(x0*y0-c*z0)

where

a=10
b=28
c=8./4.

We can play with a,b and c to see the effect.

Here the code to visualize Lorenz attractor on Python. We need VPython module to visualize it.

`from visual import *from operator import modjl=1.h=0.01a=10b=28c=8./4.x0=0.1y0=0z0=0n=10000.r=1.while jl < n:    rate(1000)    rd=mod(n,jl)/1000    sphere(pos=(x0,y0,z0),radius=r, color=(rd,1,rd))    x1=x0+h*a*(y0-x0)    y1=y0+h*(x0*(b-z0)-y0)    z1=z0+h*(x0*y0-c*z0)    jl=jl+1    x0=x1    y0=y1    z0=z1    `

Since Vpython's not support 64bit platform, we must execute the code using 32-bit python like this

Nugrohos-MacBook-Pro:cellular nugroho\$ python2.7-32 lorenz.py

Here the result
 From Blogsy Photos

### The Journey of Installing Matplotlib Python on Mac OS X Lion (continued)

To install Matplotlib, I have to install numpy first. To install numpy, I need GCC. Lion installer package didn't come with XCode, it has to be downloaded separately from MacAppStore for free. I don't dare to even trying it with my sluggish itnternet connection, so I tried others possibility without success untill I found my SnowLeopard DVD.

Finally, I am able to install GCC. I used XCode 3.2 on Snow Leopard DVD in Lion, :). So, the journey is continue…

Check (just for show off, :))

Nugrohos-MacBook-Pro:mysite nugroho\$ gcc
gcc         gcc-4.0     gcc-4.2     gccmakedep
Nugrohos-MacBook-Pro:mysite nugroho\$ gcc

Now install numpy, oh no… look at this.

Last login: Sun Dec 11 19:11:11 from 192.168.2.2
Nugrohos-MacBook-Pro:mysite nugroho\$ pip install numpy
Downloading/unpacking numpy
Downloading numpy-1.6.1.tar.gz (2.6Mb): 2.6Mb downloaded
Running setup.py egg_info for package numpy
Running from numpy source directory.non-existing path in 'numpy/distutils': 'site.cfg'
F2PY Version 2
blas_opt_info:
FOUND:
extra_link_args = ['-Wl,-framework', '-Wl,Accelerate']
define_macros = [('NO_ATLAS_INFO', 3)]
extra_compile_args = ['-faltivec', '-I/System/Library/Frameworks/vecLib.framework/Headers']

building extension "numpy.core._sort" sources
adding 'build/src.macosx-10.6-intel-2.7/numpy/core/include/numpy/config.h' to sources.
adding 'build/src.macosx-10.6-intel-2.7/numpy/core/
py/core/include/numpy/__multiarray_api.h']
building extension "numpy.core.multiarray" sources
adding 'build/src.macosx-10.6-intel-2.7/numpy/core/include/numpy/config.h' to sources.

error: could not delete '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/__config__.py': Permission denied

It's look like my gcc think it's on Snow Leopard platform, :(. But, there is small hope; the error warning just mentions permission, hm, how about sudo?

ok, let's try again

Nugrohos-MacBook-Pro:mysite nugroho\$ sudo pip install numpy
Password:
Downloading/unpacking numpy
Running setup.py egg_info for package numpy
Running from numpy source directory.non-existing path in 'numpy/distutils': 'site.cfg'

adding 'build/scripts.macosx-10.6-intel-2.7/f2py' to scripts
changing mode of /Library/Frameworks/Python.framework/Versions/2.7/bin/f2py to 755
Successfully installed numpy
Cleaning up...
Nugrohos-MacBook-Pro:mysite nugroho\$

hm, still in doubt

Nugrohos-MacBook-Pro:mysite nugroho\$ python
Python 2.7.2 (v2.7.2:8527427914a2, Jun 11 2011, 15:22:34)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>>

yeahh…
(don't know if it works as it compiled using GCC designed for Snow Leopard. At least no news is good news, :) )

So here it is

Nugrohos-MacBook-Pro:mysite nugroho\$ pip install matplotlib
Downloading/unpacking matplotlib
Downloading matplotlib-1.0.1.tar.gz (13.3Mb): 13.3Mb downloaded

BUILDING MATPLOTLIB
matplotlib: 1.0.1
python: 2.7.2 (v2.7.2:8527427914a2, Jun 11 2011, 15:22:34)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]
platform: darwin
REQUIRED DEPENDENCIES
numpy: 1.6.1
freetype2: found, but unknown version (no pkg-config)
* WARNING: Could not find 'freetype2' headers in any
* of '.', './freetype2'.
OPTIONAL BACKEND DEPENDENCIES
libpng: found, but unknown version (no pkg-config)
* Could not find 'libpng' headers in any of '.'
----------------------------------------
Command python setup.py egg_info failed with error code 1
Storing complete log in /Users/nugroho/.pip/pip.log
Nugrohos-MacBook-Pro:mysite nugroho\$

Hm, still long way to go, have to install freetype2 and lbpng. Ugh…

## Sunday, December 11, 2011

### Creating Django Apps on OS X Lion 10.7.2

As this is my first time using Django, I have to take care of some initial setup. Namely, I’ll need to auto-generate some code that establishes a Django project – a collection of settings for an instance of Django, including database configuration, Django-specific options and application-specific settings.

From the command line, cd into a directory where you’d like to store your code, I use my python directory,then run the following command:
django-admin.py startproject mysite
This will create a mysite directory in my python. Here tho result.
Nugrohos-MacBook-Pro:python nugroho\$ pwd
/Users/nugroho/python
Nugrohos-MacBook-Pro:python nugroho\$ ls
appender.py distribute-0.6.24.tar.gz graphy graphy.pyc
apprunner.py f.py graphy.py
Nugrohos-MacBook-Pro:python nugroho\$ django-admin.py startproject mysite
Nugrohos-MacBook-Pro:python nugroho\$ ls
appender.py distribute-0.6.24.tar.gz graphy graphy.pyc
apprunner.py f.py graphy.py mysite
Nugrohos-MacBook-Pro:python nugroho\$ cd mysite/
Nugrohos-MacBook-Pro:mysite nugroho\$ ls
__init__.py manage.py settings.py urls.py
Nugrohos-MacBook-Pro:mysite nugroho\$
These files in mysite directory are:
__init__.py: An empty file that tells Python that this directory should be considered a Python package. (Read more about packages in the official Python docs if you're a Python beginner.)
manage.py: A command-line utility that lets you interact with this Django project in various ways. You can read all the details about manage.py in django-admin.py and manage.py.
settings.py: Settings/configuration for this Django project. Django settings will tell you all about how settings work.
urls.py: The URL declarations for this Django project; a "table of contents" of your Django-powered site. You can read more about URLs in URL dispatcher.
To verify that it works do this
Nugrohos-MacBook-Pro:mysite nugroho\$ python manage.py runserver
Validating models...

0 errors found
Django version 1.3.1, using settings 'mysite.settings'
Development server is running at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
Yup, it works…
Try to access http://127.0.0.1:8000 with your browser, :)
Here screenshot from Safari on my Lion

 From Blogsy Photos

If we want to show off on other computer, use command below. It will listen on all public IP's

Nugrohos-MacBook-Pro:mysite nugroho\$ python manage.py runserver 0.0.0.0:8000
Validating models...

0 errors found
Django version 1.3.1, using settings 'mysite.settings'
Development server is running at http://0.0.0.0:8000/
Quit the server with CONTROL-C.

Here screenshot from my iPad

### Double Tap Dragging on Lion

I wrote about missing single-tap-hold on Lion to dragging. However, after googling around, I found that it's still has capability to do it, just you will find it at the most unpredictable place in System Preferences

To enable one finger drag by double-tap-hold, go to System Preferences, click on Universal Access, and then the Mouse & Trackpad tab. Click on the “Trackpad Options…” at the bottom section of window. Enable dragging option; we can select the desired dragging behaviour from the drop down list. I wonder why this preference is here, not on trackpad section instead.

 From Blogsy Photos

### Lion have more Finger Gesture than Snow Leopard

Migrating from Snow Leopard to Lion is confusing and annoying but fun experience. One feature of Lion that I noticed very much is new finger gesture as it's a whole different experience than Snow Leopard.

I noticed first bad feeling when I browsing through Safari and can't double-tap-hold todragging a text to highlight it. I think, oh my God, my trackpad is broken. Calming down, go to preferences panel. I can't find double tap option, hm. Drag n Drop now can be done by three finger, uh. Highlighting text using three finger seems wrong to me. So, no double-tap-hold. (edit: there is double-tap-hold )

Two finger gesture to scroll and zoom is intact. Hm, not really. Scroll direction now has default option to 'natural', iPad like scroll.

No ExposÃ© or Space, just Mission Control. Mission Control contain apps on current active desktop, just like ExposÃ©, and all full screen apps, including other desktop.

Sweeping down four finger now show windows from same apps while sweeping up bring us to Mission Control. Sweeping left or right will bring us to next full screen apps (Desktop's treated as fullscreen apps).

A new gesture is pinching with four finger; pinching down will bring up Launchpad, an apps list just like iOS. A reverse pinching, spread (not sure what it's named), will push all windows to side to show Desktop.

I'm a bit missing the time when I could switch apps by sweeping down my four finger. Moving apps through spaces has gone too, but I guess it's a sacrifice to be able jump too next step.

### The Journey of Installing Matplotlib Python Module on OS X Lion

I need matplotlib to plot my python output when I am running my output function generator python code.

This post is a log of what I did to being able to install matplotlib 1.1.0 on python 2.7.2 on my Mac OS X Lion 10.7.2. Yet, it's unfinished job.

First, googling for matplotlib, sourceforge is official home fon it, but it's very slow, I coudn't even open download page with my sluggish connection. So, I searching other source.

Got it from kambing.ui.ac.id, it has pypi repositories, but when it opened, there is no package, just blank folder.

After further googling, I finally found http://pypi.python.org, pypi stand for python package index.

To be able to use pypi package, we have to install pip first, but before that install distribute using this command

curl http://python-distribute.org/distribute_setup.py | python
curl https://raw.github.com/pypa/pip/master/contrib/get-pip.py | python

and then install matplotlib using pip, there is download activity, but got error at the end; must install numpy first, but it got error too as I didn't have GCC on my lion yet, aaarrrgghh... So, the hell of dependencies is begin...

So here I am, searching for 'light' GCC for my lion. I know I should install XCode 4 from Apple , it's free anyway, but I must face the fact that it's including 4.5GB download job, such a tedious job and wasting time; I just want to install 13 MB matplotlib.

I wish I can type the code below

pip install numpy
pip install matplotlib

(pray)

## Saturday, December 10, 2011

### iRig

Several weeks ago my iRig package has come, finally. I expect it'll come earlier but alas my home's in the middle of nowhere surounded with forest and mountain, even google map refuse to map my place, :). At least it comes safely at my front door.

I planned to use it with Amplitube on my iPad. It worked flawlessy of course. A minor annoyance, it's built in jack is undetachable, so it's uncool if you planned to bring it on your front pocket.

I'm surprised when the thing work well with my macbookpro too. My 13' MacBook Pro only have one port audio, either for input or output, so it's big 'yeah yeah' for me for be able to record my guitar on GarageBand AND listen it.

iRig work with GarageBand for iPad too, and several music apps like digital effect apps for ipad (forget its name), I'm sure not just that. Sadly, amplitube didn't support more space for effect, eight slot effect will cool. Here some screenshot.

 From Blogsy Photos
 From Blogsy Photos
 From Blogsy Photos
 From Blogsy Photos

## Monday, December 5, 2011

### Grapher on Mac OS X

Any wonder how "x power ten" curve is? Well, maybe not, we know that equation is just another parabolic like curve. But how about (x^3-3x)/(4x-3)? Maybe little calculation could help. How about e^x-x^2... (oh my God, WHAT IN EARTH YOU'RE TRYING TO SAY?)

It begin when I bought my first Mac. I realized that we could search anything using spotlight, even application and web.

Someday (forget where and when), when I surfing on internet for solution of mathematic function, I got a page full of wonderfull snapshot of exotic function on 3D with standart cartesian system, rotateable, etc. And it's said that OS X's Grapher did that. So I am Command-Space-ing my mac and voila... There's Grapher, apps I never know exist on my mac did appear.

Grapher have capability to draw almost any kind of equation. It can draw an equation in 3D or 2D. We can draw parametric function in Grapher as well.

Yeah, Grapher is, at least for me, hidden functional application brought by OS X.

The best of all, it's free, :)

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