Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


dpb
Posts:
9,288
Registered:
6/7/07


Re: Automating an iterative procedure
Posted:
Feb 23, 2013 4:47 PM


On 2/23/2013 3:01 PM, Milos Milenkovic wrote:
...[top posting repairedplease don't: hard conversation follow makes]...
> dpb <none@non.net> wrote in message <kgb86j$446$1@speranza.aioe.org>... >> On 2/23/2013 2:04 PM, Milos Milenkovic wrote: >> ... >> > K1=[0.2582 18.596 0 0.2582; >> > 34.737 1300.188 0 34.737; >> ... >> > for i=1:100 >> > B1(1)=[0.01 0.02 0.07 0.03; >> > 0.02 0.05 0.06 0.02; >> > 0.07 0.09 0.01 0.03; >> > 0.01 0.03 0.02 0.04]; >> >> ... >> >> No, but why would you want to duplicate a constant array anyway? >> Sometimes for matrix operations there's a need/desire to do so, but >> generally a temporary via repmat() or some other technique would be >> more reasonable than just holding multiple copies of the same array. >> >> B1(1) refers to a single array location whereas the rhs is an array. >> "Can't put 5lbs of 'taters in a 1lb tote" to use the E TN vernacular. >> >> Only a cell array element can hold another array. >>
...
>> B1(1) and B0(1) are given matrices in iteration 1, then for the next 99 >> iterations I want to calculate updates of these matrices.
Oh.
Move the initiation outside the loop then store new values into the desired location(s) in the array inside the iterative portion (the loop iow). To do that you don't need to subscript B1 at all other than to address individual elements therein if required. But, if you can vectorize the computation of B1 then there's no need for the indexing.
Are you needing to save all iterations to the bitter end?




