how to select two arrays from a group of four

i have 4 arrays and i need to square each element then find the total. then the 2 arrays that have to lowest total get selected and assigned a value eg, u3

would love some help from a true matlab master

Answer 1

[Thomas Satterly]

To find the sum square of an array:

sumSquared = sum(array.^2);

If you have your arrays all together in a matrix:

% If each array is a colum of the matrix
sumSquaredEachArray = sum(matrix.^2, 1);

% If each array is a row of the matrix
sumSquaredEachArray = sum(matrix.^2, 2);

For finding the two lowest scores, let's assume that you have the scores in an array called "sumSquaredEachArray" (which would happen automatically if you have your arrays organized in a matrix)

% Get the order of lower to highest scores
[~, order] = sort(sumSquaredEachArray);

% Select the first two scores from the sorted order, which would be the lowest two
lowestTwoScores = order(1:2);

% Set those scores to "u3"
sumSquaredEachArrau(lowestScores) = u3;

[Lachlan Pemberton-Pigott]

thanks this works perfect