עמודות תלויות לינארית

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Jonathan Schwartz

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Oct 21, 2014, 5:32:18 AM10/21/14
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מישהו מכיר פונקציה שיכולה למצוא איזה עמודות תליות לינארית במטריצה?

amit gal

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Oct 21, 2014, 5:42:15 AM10/21/14
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זה קצת לא מוגדר היטב.... אם כבר, בד"כ מחפשים קבוצה מקסימלית בלתי תלויה, ואז כל וקטור נוסף, תלוי לינארית.

On Tue, Oct 21, 2014 at 12:32 PM, Jonathan Schwartz <yoni.sch...@gmail.com> wrote:
מישהו מכיר פונקציה שיכולה למצוא איזה עמודות תליות לינארית במטריצה?

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Giora Simchoni

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Oct 21, 2014, 7:49:42 AM10/21/14
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Hi Yoni,

For finding pairwise correlated columns above a certain threshold (e.g. 0.99), lookup:
caret::findCorrelation


Thanks,

Giora.


On Tuesday, 21 October 2014 12:42:15 UTC+3, Amit Gal wrote:
זה קצת לא מוגדר היטב.... אם כבר, בד"כ מחפשים קבוצה מקסימלית בלתי תלויה, ואז כל וקטור נוסף, תלוי לינארית.
On Tue, Oct 21, 2014 at 12:32 PM, Jonathan Schwartz <yoni.sch...@gmail.com> wrote:
מישהו מכיר פונקציה שיכולה למצוא איזה עמודות תליות לינארית במטריצה?

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Jonathan Schwartz

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Oct 21, 2014, 7:55:29 AM10/21/14
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Thank you Giora,

But this works only for pairwise, what if 2 columns span the third for example?

Yoni

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Giora Simchoni

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Oct 21, 2014, 9:41:45 AM10/21/14
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If you suspect this kind of linear relationships, from simple to complex, I guess I would go with PCA on my columns.
PCA analysis would not only turn your columns into linearly uncorrelated combinations of columns, but might also show you "underlying" structures in your data.


On Tuesday, 21 October 2014 14:55:29 UTC+3, Jonathan Schwartz wrote:
Thank you Giora,

But this works only for pairwise, what if 2 columns span the third for example?

Yoni
On Tue, Oct 21, 2014 at 2:49 PM, Giora Simchoni <gsim...@gmail.com> wrote:
Hi Yoni,

For finding pairwise correlated columns above a certain threshold (e.g. 0.99), lookup:
caret::findCorrelation


Thanks,

Giora.


On Tuesday, 21 October 2014 12:42:15 UTC+3, Amit Gal wrote:
זה קצת לא מוגדר היטב.... אם כבר, בד"כ מחפשים קבוצה מקסימלית בלתי תלויה, ואז כל וקטור נוסף, תלוי לינארית.
On Tue, Oct 21, 2014 at 12:32 PM, Jonathan Schwartz <yoni.sch...@gmail.com> wrote:
מישהו מכיר פונקציה שיכולה למצוא איזה עמודות תליות לינארית במטריצה?

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Yotam Hechtlinger

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Oct 21, 2014, 9:54:58 AM10/21/14
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ניסית את זה?

חוץ מזה, הניחוש שלי זה שאתה יכול לחשב rank למטריצה המלאה, ואז להעיף כל עמודה שלא משפיעה על ה- rank, עד שאתה מגיע למספר עמודות כגודל ה- rank. 


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