how to sum (or recall) matrices from previous cycles?

Question

0 个投票

hi everyone,

I've got a "for" cycle of i=1:100 iterations, and in every iteration MATLAB calculates a matrix called "A".

Now for every iteration I need to sum the current matrix "A" with the previous same five matrices.

If "A" was a scalar I could do:

a(i)=a(i-1)+a(i-2)+a(i-3)+a(i-4)

but I don't now how to handle this with a matrix...could you help me?

thanks a lot!! fab

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Follow Question

Answer 1

David Young 2012-2-26

在 MATLAB Online 中打开

0 个投票

You can store the matrices using a cell array:

for i = 1:100
  < compute A >
  Astore{i} = A;
  if i >= 5
     arraySum = A{i-1} + A{i-2} + A{i-3} + A{i-4};
     < use arraySum >
  end
end

You can also do this with a multidimensional array, and if the matrices are large, you can avoid storing all 100 of them by only keeping the last 5. Please say if you want more details of either of these options.

2 个评论
显示无隐藏无

Faber 2012-2-26

David thank you for your answer,

it seems to me that there is always a problem, using:

Astore{i} = A;

MATLAB tells me " In an assignment A(I) = B, the number of elements in B and I must be the same."

because I think Astore looks like a scalar in this way...have I forgot something?

thank you!

Faber 2012-2-26

sorry David, it's my fault, I didn't noticed the {} brackets, now everything works! Thank you very much for your help!

Bye

Fab

请先登录，再进行评论。

how to sum (or recall) matrices from previous cycles?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

2 个评论
显示无隐藏无

更多回答（0 个）

类别

标签

Community Treasure Hunt

how to sum (or recall) matrices from previous cycles?

0 个评论 显示 -2更早的评论 隐藏 -2更早的评论

采纳的回答

2 个评论 显示 无 隐藏 无

更多回答（0 个）

类别

标签

另请参阅

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

2 个评论
显示无隐藏无