Q. Cannot display summaries of variables i.e. here Y U V with more than 524288 elements.

Answer 1

[Walter Roberson]

If you really need those statistics, then you can use

min(Y(:))
max(Y(:))
mean(Y(:))
std(Y(:))

at the MATLAB command line.

It is not possible to reconfigure MATLAB's Variable Browser so that it shows statistics automatically for arrays with more than 2^19 elements.