How can I generate a matrix?

2 次查看(过去 30 天)
net
net 2013-11-20
评论: net 2013-11-20
Hi, I have two array and I want to generate one matrix according to these arrays.
For example:
a={2,5,2,4,2,3,4,4,8}
b={1,3,1,3,4,2,3,3,2}
Matrix is 2 to 1 -> 1, 5 to 3 -> 1, 2 to 1 -> 2 (again) ...
Output:
Thanks for your helps.

采纳的回答

Simon
Simon 2013-11-20
Hi!
Loop over your a/b vectors and increase the specified matrix element:
M = zeros(max(a), max(b));
for n = 1:length(a)
M(a(n), b(n)) = M(a(n), b(n)) + 1;
end

更多回答(2 个)

Laurent
Laurent 2013-11-20
a={2,5,2,4,2,3,4,4,8};
b={1,3,1,3,4,2,3,3,2};
yourmat=zeros(8,5);
for ii=1:length(a)
yourmat(a{ii},b{ii})=yourmat(a{ii},b{ii})+1;
end
Why are you using a cell array for a and b?
  2 个评论
net
net 2013-11-20
Array "a" is my states and "b" is my observations. I want to know that states and observations amount.
Sorry for my english.
net
net 2013-11-20
Yes you are right, I wrote with wrong parenthesis. Thanks.

请先登录,再进行评论。


Andrei Bobrov
Andrei Bobrov 2013-11-20
编辑:Andrei Bobrov 2013-11-20
a=[2,5,2,4,2,3,4,4,8];
b=[1,3,1,3,4,2,3,3,2];
sz = [8 5];
out = nan(sz + 1);
out(2:end,2:end) = accumarray([a(:),b(:)],1,sz);
out(1,2:end) = 1:sz(2);
out(2:end,1) = 1:sz(1);
  2 个评论
Shani
Shani 2013-11-20
Andrei do you know about neural networks?
net
net 2013-11-20
Thanks for your help.

请先登录,再进行评论。

类别

Help CenterFile Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by