Multiplying two double arrays within a structure

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Kelly
Kelly 2019-8-15
回答： Guillaume 2019-8-16
Hi,
I am trying to multiply two arrays together, which are contained in the same structure. I have a 1x28 structure containing different variables all a double array (7974x1) and I need to multiply together two of these variables within each structure.
My code:
% SerStruct (1x28 struct)
% A (7974x1 double)
% B (7974x1 double)
for i = 1:length(SerStruct);
dat1 = SerStruct(i).A.* SerStruct(i).B;
end
The answer I get is: dat1 = 88016x1
However if I count the number of rows in each double array (either A or B) within each 28 cells, there should be more like 500000x1.
Can anyone please help me?
Thank you!
  1 个评论
James Tursa
James Tursa 2019-8-15
编辑：James Tursa 2019-8-15
What is size(SerStruct(i).A) and size(SerStruct(i).B) for each i? This should be pretty simple to debug and figure out what is going on by just examining the sizes.

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采纳的回答

Guillaume
Guillaume 2019-8-16
It sounds like you want to vertically concatenate the result of the multiplication for each element of your structure array.
With a loop:
result = cell(size(SerStruct)); %preallocate temporary cell array to store the result of the multiplications
for idx = 1:numel(SerStruct) %iterate over each element of the structure array (with fields A and B
result{idx} = SerStruct(idx).A .* SerStruct(idx).B; %do the multiplication for each element
end
result = vertcat(result{:}); %vertically concatenate the whole lot (could also use cell2mat if the structure array is a column vector
With arrayfun:
result = arrayfun(@(s) s.A .* s.B, SerStruct, 'UniformOutput', false); %does the same thing as the loop
result = vertcat(result{:});

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