How to get arg min of an N-dimensional Matrix ?

Hi, i'm having an image of size[280,307,191] and i want to get the argmin of it,Any help?

Answer 1

[James Tursa]

[m n] = min(M(:));
[x y z] = ind2sub(size(M),n);

x, y, z will be the indexes (i.e., argmin) of the minimum value of your 3D array M.

[Rawan hamdi]

thanks but what are the m & n ?

[Jan]

The documentation of min explains this exhaustively already. Type this in Matlab's command window:

help min
doc min

and read it.

Answer 2

[Cedric]

How do you define argmin? If it is the global min, you can get it as follows:

 min(M(:))

where M is your 3D array.

[Rawan hamdi]

i don't know what argmin means actually,

i have an equation like this :

x = arg min |g-u|.^2 g and u are 2 multibanded images

and im trying to implement it in matlab

[Jan]

Why do you want to implement something, when you do not know its mathematical meaning?

[Sreeda M A]

can you please explain what values should I give for M ??

[Andrei Bobrov]

Hi Sreeda M A! Example:

M = randi(400,280,307,191);

Answer 3

[Sean de Wolski]

Or:

min(min(min(M)))

[Ties Hendrickx]

Nope, this will return the minimum value and not the index of the minimum value

[Cedric]

Just use [~,linIdx] = min(M(:)) and then convert to subscripts using IND2SUB.

Answer 4

[Steven Lord]

If you're using release R2019a or later, you probably want to call min with the 'all' dimension input and the 'linear' flag.