Find maximum of an array in a for loop?

I need to calculate the maximum of each array from the load variable in the following for loop.

myDir = uigetdir;
myFiles = dir(fullfile(myDir,'*.txt'));
for k = 1:length(myFiles)
    baseFileName = myFiles(k).name;
    fullFileName = fullfile(myDir, baseFileName);
    fprintf(1, 'Now reading %s\n', fullFileName);
    num = readmatrix(fullFileName);
    load = num(:,1)
    ext = num(:,3)
    plot(ext,load); hold on
    grid on; 
end

Answer 1

[dpb]

GENERAL GUIDANCE:

Do NOT name a variable load; it is a builtin in important MATLAB function; developing a habit of aliasing it will confuse things immeasruably when come to using .mat files.

myDir = uigetdir;
myFiles = dir(fullfile(myDir,'*.txt'));
N=length(myFiles);
MaxY=zeros(N,1);                                                % preallocate for maxima
for k = 1:N
  fullFileName = fullfile(myFiles(k).folder,myFiles(k).name);   % use the results directly...
  fprintf('Now reading %s\n', fullFileName);
  data=readmatrix(fullFileName);
  plot(data(:,1),data(:,3));
  MaxY(k)=max(data(:,3));
  if k==1, hold on; grid on; end
end

No need for copies of the original data just taking up memory...although MATLAB will not make a deep copy here.

[Brennan Lytle]

Thank you. This worked great!

If I want to find the corresponding row value in column 1 with the maximum found in column 3, how could I add that into the loop?

[dpb]

Read the doc for max -- look at the optional second output variable.