[Tutor] Help- Regarding python
Hi All!
If i have data set like this means...
3626,5000,2918,5000,2353,2334,2642,1730,1687,1695,1717,1744,593,502,493,504,449,431,444,444,429,10
438,498,3626,3629,5000,2918,5000,2640,2334,2639,1696,1687,1695,1717,1744,592,502,493,504,449,431,444,441,429,10
439,498,3626,3629,5000,2918,5000,2633,2334,2645,1705,1686,1694,1719,1744,589,502,493,504,446,431,444,444,430,10
440,5000,3627,3628,5000,2919,3028,2346,2330,2638,1727,1684,1692,1714,1745,588,501,492,504,451,433,446,444,432,10
444,5021,3631,3634,5000,2919,5000,2626,2327,2638,1698,1680,1688,1709,1740,595,500,491,503,453,436,448,444,436,10
451,5025,3635,3639,5000,2920,3027,2620,2323,2632,1706,1673,1681,1703,753,595,499,491,502,457,440,453,454,442,20
458,5022,3640,3644,5000,2922,5000,2346,2321,2628,1688,1666,1674,1696,744,590,496.
How to do PCA on this data? if it is in array how to do that? and also how
to use princomp() in PCA?
Shall i use the following code for doing PCA on given input? could you tell
me?
from numpy import mean,cov,double,cumsum,dot,linalg,array,rank
from pylab import plot,subplot,axis,stem,show,figure
A = array([ [2.4,0.7,2.9,2.2,3.0,2.7,1.6,1.1,1.6,0.9],
[2.5,0.5,2.2,1.9,3.1,2.3,2,1,1.5,1.1] ])
M = (A-mean(A.T,axis=1)).T[latent,coeff] = linalg.eig(cov(M))
score = dot(coeff.T,M)
return coeff,score,latent
princomp(A):
coeff, score, latent = princomp(A.T)
figure()
subplot(121)
m = mean(A,axis=1)
plot([0, -coeff[0,0]*2]+m[0], [0, -coeff[0,1]*2]+m[1],'--k')
plot([0, coeff[1,0]*2]+m[0], [0, coeff[1,1]*2]+m[1],'--k')
plot(A[0,:],A[1,:],'ob') # the data
axis('equal')
subplot(122)
plot(score[0,:],score[1,:],'*g')
axis('equal')
plt.show()
Thanks!
Regards,
Gayathri.
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Re: [Tutor] HELP- Regarding working with python
Hi all...! I don't know how to import our own data sets in python. its always importing the in built data sets. could you just tell me how to do that...! Thanks...! On Mon, Jan 28, 2013 at 1:50 PM, Steven D'Aprano st...@pearwood.infowrote: On 28/01/13 18:26, Gayathri S wrote: Hi all..! wanna know how to compile python script in python command line, and is there any need for setting path for python like JAVA? whats the difference between .py file and .pyc file? Python is a byte-code compiled language, like Java many years ago. Normally to compile a python module, you just import it from within Python. That is not very convenient for scripts, so from the shell (bash, command.com, cmd.exe, or similar) you can run python -m compileall NAME NAME ... to compile scripts. You do not necessarily need to set the PYTHONPATH, but you can if you need to. .py files are source code. .pyc are compiled byte code. .pyo are compiled byte code with optimization turned on. Don't get too excited, the standard Python optimization doesn't do very much. -- Steven __**_ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/**mailman/listinfo/tutorhttp://mail.python.org/mailman/listinfo/tutor -- Keep Smiling. Regards Gayu ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] HELP-Regarding python
Hi All! I don't know how to read text file in python. If the data values are stored in a text file format, for example(1,30,60,90,120...200) means what i would do for reading it in python. could you just explain it. Thanks! Keep Smiling.[?] Regards Gayu[?] 335.png___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP- Regarding working with python
Hi all..! wanna know how to compile python script in python command line, and is there any need for setting path for python like JAVA? whats the difference between .py file and .pyc file? Thanks...! On Sat, Jan 19, 2013 at 8:54 AM, bob gailer bgai...@gmail.com wrote: On 1/18/2013 8:03 AM, eryksun wrote: Yes, it's a mistake in the PCA example from the docs: http://mlpy.sourceforge.net/**docs/3.5/dim_red.html#** principal-component-analysis-**pcahttp://mlpy.sourceforge.net/docs/3.5/dim_red.html#principal-component-analysis-pca There seems to be no way to report a bug in that documentation! Or am I missing something? -- Bob Gailer 919-636-4239 Chapel Hill NC __**_ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/**mailman/listinfo/tutorhttp://mail.python.org/mailman/listinfo/tutor -- Keep Smiling. Regards Gayu ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP- Regarding working with python
hi... I am using principal component analysis for dimensionality reduction in python. am having this following error... import numpy as np import matplotlib.pyplot as plt import mlpy np.random.seed(0) mean,cov,n=[0,0],[[1,1],[1,1.5]],100 x=np.random.multivariate_normal(mean,cov,n) pca.learn(x) Traceback (most recent call last): File interactive input, line 1, in module NameError: name 'pca' is not defined would you please help me in finding the error...? what was my fault? how could i use PCA in python..? Thanks.! On Wed, Jan 9, 2013 at 12:58 PM, Gayathri S gayathri.s...@gmail.com wrote: Hi.. I would like to use Principal component analysis independent component analysis in python. Wanna know whether it will support this efficiently or not? On Wed, Jan 2, 2013 at 4:59 PM, Alan Gauld alan.ga...@btinternet.comwrote: On 02/01/13 07:20, Gayathri S wrote: Hi.. I am using python 2.7 and scikit-learn for machine learning. And OS is Windows 7. Wanna know how to import our own data sets in scikit-learn? Further to my last mail there is a gmane group gmane.comp.python.scikit-learn I'd try looking there, or wherever it is sourced originally. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ __**_ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/**mailman/listinfo/tutorhttp://mail.python.org/mailman/listinfo/tutor -- Keep Smiling. Regards Gayu -- Keep Smiling. Regards Gayu ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] HELP- Regarding working with python
Hi.. I would like to use Principal component analysis independent component analysis in python. Wanna know whether it will support this efficiently or not? On Wed, Jan 2, 2013 at 4:59 PM, Alan Gauld alan.ga...@btinternet.comwrote: On 02/01/13 07:20, Gayathri S wrote: Hi.. I am using python 2.7 and scikit-learn for machine learning. And OS is Windows 7. Wanna know how to import our own data sets in scikit-learn? Further to my last mail there is a gmane group gmane.comp.python.scikit-learn I'd try looking there, or wherever it is sourced originally. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ __**_ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/**mailman/listinfo/tutorhttp://mail.python.org/mailman/listinfo/tutor -- Keep Smiling. Regards Gayu ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] HELP- Regarding working with python
Hi.. I am using python 2.7 and scikit-learn for machine learning. And OS is Windows 7. Wanna know how to import our own data sets in scikit-learn? Regards, Gayathri.S ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
