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SVDC did not converge [message #85246]

Thu, 18 July 2013 09:07

fd_luni
Messages: 66
Registered: January 2013

Member

Hi

I am using the Singular value decomposition method (SVDC function) and so far everything works fine.

I have two arrays: one with p-values and the other with d-values
E.G. p=[0.02,0.04,0.06] and d=[0.01,0.015,0.025]
Each time I choose if I want to use the p or the d array. When I use the p array everything is ok but when I use the d array I've got the following error and I don't see why:

> SVDC: svdcmp_d did not converge.
> Array has a corrupted descriptor: <No name>.

Does anyone know why this happens?

ManY Thanks
M

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Re: SVDC did not converge [message #85259 is a reply to message #85246]

Fri, 19 July 2013 00:04

Rob Klooster
Messages: 18
Registered: February 2013

Junior Member

Op donderdag 18 juli 2013 18:07:52 UTC+2 schreef fd_...@mail.com het volgende:
> Hi
>
>
>
> I am using the Singular value decomposition method (SVDC function) and so far everything works fine.
>
>
>
> I have two arrays: one with p-values and the other with d-values
>
> E.G. p=[0.02,0.04,0.06] and d=[0.01,0.015,0.025]
>
> Each time I choose if I want to use the p or the d array. When I use the p array everything is ok but when I use the d array I've got the following error and I don't see why:
>
>
>
>> SVDC: svdcmp_d did not converge.
>
>> Array has a corrupted descriptor: <No name>.
>
>
>
> Does anyone know why this happens?
>
>
>
> ManY Thanks
>
> M

What are the matrices of which you want to calculate the SVD? I cannot reproduce the error you get, could you provide some example code?

Rob.

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Re: SVDC did not converge [message #85260 is a reply to message #85259]

Fri, 19 July 2013 01:22

Rob Klooster
Messages: 18
Registered: February 2013

Junior Member

Op vrijdag 19 juli 2013 09:04:57 UTC+2 schreef Rob Klooster het volgende:
> Op donderdag 18 juli 2013 18:07:52 UTC+2 schreef fd_...@mail.com het volgende:
>
>> Hi
>
>>
>
>>
>
>>
>
>> I am using the Singular value decomposition method (SVDC function) and so far everything works fine.
>
>>
>
>>
>
>>
>
>> I have two arrays: one with p-values and the other with d-values
>
>>
>
>> E.G. p=[0.02,0.04,0.06] and d=[0.01,0.015,0.025]
>
>>
>
>> Each time I choose if I want to use the p or the d array. When I use the p array everything is ok but when I use the d array I've got the following error and I don't see why:
>
>>
>
>>
>
>>
>
>>> SVDC: svdcmp_d did not converge.
>
>>
>
>>> Array has a corrupted descriptor: <No name>.
>
>>
>
>>
>
>>
>
>> Does anyone know why this happens?
>
>>
>
>>
>
>>
>
>> ManY Thanks
>
>>
>
>> M
>
>
>
> What are the matrices of which you want to calculate the SVD? I cannot reproduce the error you get, could you provide some example code?
>
>
>
> Rob.

I just noticed that the error can come from NAN's in your array. You should check for those with the finite() function.

Rob.

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Re: SVDC did not converge [message #85261 is a reply to message #85260]

Fri, 19 July 2013 02:21

fd_luni
Messages: 66
Registered: January 2013

Member

Yes, maybe! This error appears when I am using an array with very small values. I will check with the finite() function.

Cheers
M

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Re: SVDC did not converge [message #85263 is a reply to message #85261]

Fri, 19 July 2013 08:34

Mats Löfdahl
Messages: 263
Registered: January 2012

Senior Member

On 2013-07-19 11:21, fd_luni@mail.com wrote:
> Yes, maybe! This error appears when I am using an array with very small values. I will check with the finite() function.

You could try using la_svd instead of svdc.

/Mats

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