| SVDC procedure [message #88317] |
Mon, 14 April 2014 02:54  |
g.nacarts
Messages: 148
Registered: November 2013
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Senior Member |
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Does SVDC procedure works for under determined systems? I tried to solve my system but I ended up with negative value and it supposed to be all positive.
Here are my matrices:
A= [[21, 10, 6], [1,1,1]]
SVDC
b= [[570], [8070]]
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| Re: SVDC procedure [message #88335 is a reply to message #88317] |
Tue, 15 April 2014 11:47  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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On Monday, April 14, 2014 5:54:00 AM UTC-4, g.na...@gmail.com wrote:
> Does SVDC procedure works for under determined systems? I tried to solve my system but I ended up with negative value and it supposed to be all positive.
>
> Here are my matrices:
>
> A= [[21, 10, 6], [1,1,1]]
>
> b= [[570], [8070]]
Which value was negative? When I run
SVDC, A, w, u, v
then I get,
W = 24.0702 0.790450 -0.00000
None of those values is "negative." (-0 is still equal to zero) For an under-determined system one should expect some zero singular values.
Craig
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| Re: SVDC procedure [message #88363 is a reply to message #88350] |
Wed, 16 April 2014 14:11 |
Mats Löfdahl
Messages: 263
Registered: January 2012
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Senior Member |
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Den onsdagen den 16:e april 2014 kl. 13:09:00 UTC+2 skrev g.na...@gmail.com:
> I don't mean the singular values. My final answer include a negative value.
You do know that an under determined system has an infinite number of solutions? If you don't like the one you've got, pick another...
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