[R] Fwd: Quadratic programming, for loop

[Spencer Graves]

       sos::findFn('{quadratic programming}') just identified 156 help 
pages in 68 packages containing the term "quadratic programming".  The 
function mentioned by Berwin Turlach, "solve.QP", is in package 
"quadprog", which has not been updated since 2016-12-20.  I've used 
qudprod successfully, but you might wish to consider some of the other 
options in package(s) more actively maintained.


       The "print" method for sos::findFn('{quadratic programming}') 
produced two sheets in my default browser.  The first of these contained 
156 rows for the 156 help pages in 68 packages, sorted by default by 
c('Count', 'MaxScore', 'TotalScore', 'Package', 'Score', 'Function').  
The second sheet listed only the 68 packages sorted by c('Count', 
'MaxScore', 'TotalScore', 'Package').  You can click on the column 
headers to get them sorted in different orders, if you want.


       "sos::findFn" is for me the fastest literature search for 
anything statistical.  I often write the list of help pages and the 
package summary to an Excel file using the "writeFindFn2xls" function, 
then annotate the package summary with other information to help me 
decide which package(s) and function(s) to try.


       Hope this helps.
       Spencer Graves, lead author of "sos"


On 2018-06-26 07:01, Berwin A Turlach wrote:
> G'day all,
>
> On Tue, 26 Jun 2018 11:16:55 +0300
> Maija Sirkjärvi <maija.sirkjarvi using gmail.com> wrote:
>
>> It seems that my Amat and dvec are incompatible. Amat is a matrix of
>> zeros size: *2*J-3,J* and dvec is a vector of length *J*. There
>> should be no problem, but apparently there is. [...]
> solve.QP solves the quadratic program:
> 	 min(-d^T b + 1/2 b^T D b)
>     where A^T b >= b_0.
>
> Note the transpose. :)
> If dvec is of length *J*, then b will be of length J too, and Amat
> should be Jx(2J-3) so that its transpose is (2j-3)xJ, making it
> compatible for matrix multiplication with b.
>
> Cheers,
>
> 	Berwin
>
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