Speed up the minimum search in a third order tensor

Hi

I need to find the absolute minimum inside a thermographic set of data (let's call it hyper_cube) which is a third order tensor, with the structure

1. dimension one = pixel
2. dimension two = pixel
3. dimenstion three = time (time steps)

to be exact the tensor has the sizes of (512,640,3000) and it is loaded from an external mat file which is 1.4 GByte big.

I need to retrieve the absolute minimum but using the "traditional":

abs_min = min(min(hyper_cube(:))); 

search takes up to 1 minutes and 30 seconds. I was wondering if there is a way to speed up this search.

• I am working with MATLAB 2015 and 2018 and I am dealing with retrocompatibily since 2014
• the computer I am working with is a DELL Latitude 5480. Not the fastest tool ever I am aware

Greetings

Luca