cellfun with Frobenius norm

3 次查看（过去 30 天）

Xh Du 2017-3-3

评论： Xh Du 2017-3-3

Hi all,

I'd like to obtain Frobenius norm for each element in a cell, I wrote this:

a1 = (1:6)';
a2 = (2:7)';
a3 = (3:8)';
a = {a1 a2 a3};
nm.a = cellfun(@norm, a);

However, if I want a Frobenius norm, I'll need norm(x, 'fro'), how can I add 'fro' in this case in cellfun?

Thank you!

Guillaume 2017-3-3

Use an anonymous function:

nm.a = cellfun(@(m) norm(m, 'fro'), a)

Guillaume 2017-3-3

Looks compact enough to me. If it bothers you that much, create an m file called frobeniusnorm.m with the content:

function m = frobeniusnorm(x)
   m = norm(x, 'fro');
end

You can then write your cellfun more compactly:

nm.a = cellfun(@frobeniusnorm, a);

Xh Du 2017-3-3

Many thanks, I was just wondering is there a possibility to write without an anonymous function.

MATLAB Language Fundamentals Data Types Structures

在 Help Center 和 File Exchange 中查找有关 Structures 的更多信息

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

Translated by