Multiplying two double arrays within a structure

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!

[James Tursa]

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.

Answer 1

[Guillaume]

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{:});