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Re: Applying each element of a vector to each row of a matrix
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From: |
Jordi Gutiérrez Hermoso |
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Subject: |
Re: Applying each element of a vector to each row of a matrix |
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Date: |
Sun, 19 Dec 2010 11:08:45 -0600 |
2010/12/19 Martin Helm <address@hidden>:
> Am Sonntag, 19. Dezember 2010, 17:11:42 schrieb Jordi Gutiérrez Hermoso:
>> 2010/12/19 Martin Helm <address@hidden>:
>> > Am Sonntag, 19. Dezember 2010, 16:33:20 schrieb Jordi Gutiérrez
>> >
>> > Hermoso:
>> >> I'm often found with a situation in which I have some matrix A and
>> >> some vector v and I would like to do something like multiply each
>> >> column or row in A by each element of v.
>> >
>> > There is a special type "diagonal matrix" which should fit your
>> > needs.
>>
>> [snip]
>>
>> > diag(v)*a for example
>>
>> Ah, yes, I hadn't thought of that. Jaroslav worked on extending diag
>> matrices. But that only covers the multiplication and division cases.
>>
>> Sometimes I also want to do this with exponentiation. What then?
>
> But exponentiation of a diagonal matrix is trivial:
No, no... exponentiate each row or column of a matrix by each element
of a vector.
- Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Martin Helm, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Martin Helm, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix,
Jordi Gutiérrez Hermoso <=
- Re: Applying each element of a vector to each row of a matrix, Martin Helm, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Olaf Till, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Jonathan Webster, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/20
- Re: Applying each element of a vector to each row of a matrix, Jonathan Webster, 2010/12/20
- Re: Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Judd Storrs, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Martin Helm, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Francesco Potortì, 2010/12/20