Fill matrix with zeros

Question

Cladio Andrea 2015-1-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/170267-fill-matrix-with-zeros

编辑： Mohammad Abouali 2015-1-16

Hello, i have two matrices, one has fixed size 100x1 and the second one changes lets say could be 97x4 or 103x4, i want to multiply just the first columns of these two, but how can i multiply them, i just want to fill the rest of the rows with zeros if its less than 100 ,and i want to remove the last three columns if it is more than 100, Any ideas? Thank you

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。

Answer 1

Mohammad Abouali 2015-1-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/170267-fill-matrix-with-zeros#answer_165095

编辑：Mohammad Abouali 2015-1-16

在 MATLAB Online 中打开

A: is the Fixed Sized Matrix

B: is the Variable Sized Matrix

A(:,1) .* [B(1:min(size(A,1),size(B,1)),1); zeros(size(A,1)-size(B,1),1)]

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Cladio Andrea 2015-1-16

i was exactly looking for this. Thank you Mohammad!!

请先登录，再进行评论。

Answer 2

Image Analyst 2015-1-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/170267-fill-matrix-with-zeros#answer_165096

在 MATLAB Online 中打开

Try this:

% Sample data
matrix1 = randi(9, 100, 1);
matrix2 = randi(9, 97, 4);
[rows, columns] = size(matrix2)
if rows > 100
    % Crop off any rows more than 100
    matrix2 = matrix2(1:100, :);
elseif rows < 100
  % Pad with rows of zero.
    matrix2(100,:) = 0;
end
% Now multiply.
col1Product = matrix1 .* matrix2(:, 1);