matrix playing

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PChoppala
PChoppala 2011-10-14
Hi all
i have
w1 =
1.0000 1.0000 1.0000 1.0000 1.0000 1.0000
1.0000 1.0002 1.0000 1.0001 1.0000 1.0001
I want a new matrix with product of all terms in each 2x2 matrix in w1
Eventually, I need a 1x3 matrix.
If I use prod(w1), only the columns get multiplied.
Can anyone help please

采纳的回答

Walter Roberson
Walter Roberson 2011-10-14
blkproc(w1,[2 2],@prod)
  4 个评论
PChoppala
PChoppala 2011-10-14
Worked, but, just a quick question,
What is 'x'?
Walter Roberson
Walter Roberson 2011-10-14
x is the "formal argument" for the anonymous function. It is nearly exactly like the x in
proc result = multiplyblock(x)
result = prod(x(:));
end

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更多回答(1 个)

Image Analyst
Image Analyst 2011-10-14
Looks like a job for blockproc().
% Generate sample data.
w1 =[...
1.0000 4.0000 1.0000 2.0000 1.0000 6.0000;
1.0000 1.0002 1.0000 1.0001 1.0000 1.0001]
% Declare a function
fun = @(block_struct) prod(block_struct.data(:))
% Do the job:
result = blockproc(w1,[2 2], fun)
Note I changed w1 to make it easier to see that it actually did the job.

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