How to save mat file from specific index

Question

Med Future 2022-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/1648265-how-to-save-mat-file-from-specific-index

编辑： Matt J 2022-2-12

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HI, I hope you are doing well.

I have the following Code It saves the frame as mat file name as frame8PSK001 to frame8PSK5000.

I want to save the frame starting from 8PSK5001 to So ON how can i save that

The folllowing for loop is used to save the mat files

for p=1:numFramesPerModType

How can i change the value

dataDirectory='C/NewFolder'
numFramesPerModType=5000
fileNameRoot = "frame";
% Check if data files exist
dataFilesExist = false;
if exist(dataDirectory,'dir')
  files = dir(fullfile(dataDirectory,sprintf("%s*",fileNameRoot)));
  if length(files) == numModulationTypes*numFramesPerModType
    dataFilesExist = true;
  end
end
if ~dataFilesExist
  disp("Generating data and saving in data files...")
  [success,msg,msgID] = mkdir(dataDirectory);
  if ~success
    error(msgID,msg)
  end
  for modType = 1:numModulationTypes
    elapsedTime = seconds(toc);
    elapsedTime.Format = 'hh:mm:ss';
    fprintf('%s - Generating %s frames\n', ...
      elapsedTime, modulationTypes(modType))
    
    label = modulationTypes(modType);
    numSymbols = (numFramesPerModType / sps);
    dataSrc = helperModClassGetSourceAMC(modulationTypes(modType), sps, 2*spf, fs);
    modulator = helperModClassGetModulatorAMC(modulationTypes(modType), sps, fs);
    if contains(char(modulationTypes(modType)), {'B-FM','DSB-AM','SSB-AM'})
      % Analog modulation types use a center frequency of 100 MHz
      channel.CenterFrequency = 100e6;
    else
      % Digital modulation types use a center frequency of 902 MHz
      channel.CenterFrequency = 902e6;
    end
    
    for p=1:numFramesPerModType
      % Generate random data
      x = dataSrc();
      
      % Modulate
      y = modulator(x);
      
      % Pass through independent channels
      rxSamples = channel(y);
      
      % Remove transients from the beginning, trim to size, and normalize
      frame = helperModClassFrameGenerator(rxSamples, spf, spf, transDelay, sps);
      
      % Save data file
      fileName = fullfile(dataDirectory,...
        sprintf("%s%s%03d",fileNameRoot,modulationTypes(modType),p));
      save(fileName,"frame","label")
      
    end
  end
else
  disp("Data files exist. Skip data generation.")
end

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Matt J 2022-2-12

Are you sure that's a good idea? Why not save all frames together in one file? The difficulty you're facing splitting them up will be encountered again when you need to read them back in.

Med Future 2022-2-12