As per my understanding you want to read all files in a directory and read the excel files and plot the values in particular columns.
currentpath = pwd;
dataPath = string(currentpath)+ '\data';
allFiles = dir(dataPath);
sz = size(allFiles,1);
figure
for i = [3:sz]
% The index start from 3 because for i = 1 & 2,
% allFiles.names is '.' & '..' respectively.
path = dataPath + '\' + allFiles(i).name;
data = readtable(path);
hold on
plot(data.Var4)
hold on
plot(data.Var10)
end
Here, Var4 and Var10 are used for column 4 & 10. You can use Var<n> where n is the column number.
