finding index of minimum or maximum in tall array

I'm tryin to find the index of the minimum and maximum of each row in a tall mxn array because I need to determine the number of elements between the max and min for each row. Does anyone have any ideas for how I could do this?

Here's what I've got.

% A is a 100 x 48 tall array
% minA is what I'm using to contain the minimum of each row and the index of the minimum
% maxA contains the maximum of each row and the index of the maximum

minA(:,1) = min(A(:,5:20),[],2); % I only want the minimum value between the 5th and 20th elements
min(:,2) = % index of minA(:,1) for each row + 4 because I'm only searching from the 5th element onwards
% the maximum needs to be the maximum between the minimum element and the 40th element. To do this I need the index of the minimum element. 
maxA(:,1) = max(min(:,2):40,[],2);
maxA(:,2) = %index of maxA(:,1) for each row + index of minA bevause I'm only searching from minA onwards.

width(:) = maxA(:,2)-minA(:,2); % width is the number of elements between the min and max for each row


%%
% if this was a regular array and not a tall array, the functions min and max would also return an index, 
% but since it's tall, I can't get an index from the function. I've tried find:

find(A(:,(5:20)) == minA(:,1)) % This does not work. 

help!

[Jalaj Gambhir]

Is it required to store data in tall array format?

[lalikesbrains]

The data is too big for memory which is why I've been trying to use tall arrays. Is there any other technique that would work?