Matlab：将一个单元格乘以一个向量

Question

I currently do this:

x1 = {...}; %a 1xn cell with each element being a column vector
w = [...]; %some column vector
result = zeros(n,1);

% now I want to multiply each vector in x by w

for i = 1:n
  result(i) = w'*cell2mat(x1(i));
end

This works of course but the idea behind Matlab is to make use of it's optimised vector and matrix multiplication etc. So I though I'm probably doing something wrong. Is there a better way of doing the above performance-wise?

Answer 1

我认为你可以用for方式替换你的for循环：

result = w'*cell2mat(x1);

Answer 2

Alternatively you can use

result = cellfun(@(x) w'*x,x1);

Though I think the other answer will be quicker.