Extracting max or min values from each row in a matrix, and storing them and their indices.

Hi! I am trying to extract the max and min values between columns startIdx:endIdx

function N2 = extractN2(data, startT, endT)
Fs = 250;                                    % Sampling Frequency (Hz)
Ts = 1/Fs;                                   % Sampling Interval (s)
startIdx = floor(startT / (Ts * 1E+3))+51;      % Start Time (ms)
endIdx = floor(endT / (Ts * 1E+3))+50;          % End time (ms)
sTimes = [-200:4:796];

for l=1:size(data)
  ???
end

of each row of a matrix, as well as the indices of these values.

So for example, I have a matrix (64x250) and I want to extract the min value between columns 70:124, and store this value in a new variable. I also want to get the index of this value. I was thinking of doing it in a loop, so that it runs through each row of the matrix, and the outputswould be 64x1 (one for min values and one for indices). Any help or tips would be appreciated!

Answer 1

[Image Analyst]

Try

[N2, indexes] = min(data(:, startT:endT), 1); % Get min of every column between column "startT" and column "endT"

[User48765]

Hmm, when I do that, I get the following error;

Error using min

MIN with two matrices to compare and two

output arguments is not supported.

>> [N2, indexes] = min(ERP_CG1(:, 88:124), 1);

[Image Analyst]

I forgot the middle brackets. Presumably you looked it up in the help, but here is the solution:

[N2, indexes] = min(ERP_CG1(:, 88:124), [], 1)