How to write an equation on the ylabel of a figure in MATLAB?

Question

I'm trying to write the following math on the ylabel of a figure in MATLAB,

\norm{\boldsymbol{\tilde{y}}(t)}_2

I've tried this,

ylabel('\norm\boldmath{\bf{$y$}}$(t)$', 'interpreter', 'latex');

But got the following error, Warning: Error updating Text.

Character vector must have valid interpreter syntax: \norm\boldmath{\bf{$y$}}$(t)$

If I use,

ylabel('$|\!|\boldmath{\bf{y}}(t)|\!|_2$', 'interpreter', 'latex');

I get,

but I want the 2-norm of this,

Answer 1

\norm isn't available, but you can use |\!\.

I can't see a way to do (the revised question) in math, but you can do it in text with \textbf{\emph{y}}.

ylabel('$|\!|\textbf{\emph{y}}(\mathrm{t})|\!|_2$', 'interpreter', 'latex');

If you don't really want the t to be upright:

ylabel('$|\!|\textbf{\emph{y}}(t)|\!|_2$', 'interpreter', 'latex');