How to Loop on Different SNR values in MATLAB

Question

Med Future 2022-2-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1648295-how-to-loop-on-different-snr-values-in-matlab

编辑： Voss 2022-2-12

采纳的回答： Voss

在 MATLAB Online 中打开

Hi, I Hope you are doing well,

I want to make a Loop which takes different SNR value from array or cell. and save the mat file for each SNR

How can i do that?

i have the following code

But the files are overwritting How can i avoid overwrite

for SNR=[-20,-10,0,10,20,30]
channel = helperModClassTestChannel(...
  'SampleRate', fs, ...
  'SNR', SNR, ...
  'PathDelays', [0 1.8 3.4] / fs, ...
  'AveragePathGains', [0 -2 -10], ...
  'KFactor', 4, ...
  'MaximumDopplerShift', 4, ...
  'MaximumClockOffset', 5, ...
  'CenterFrequency', 902e6)
for p=1:numFramesPerModType
     
      % 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%s%03d_SNR",fileNameRoot,modulationTypes(modType),p,SNR));
      save(fileName,"frame","label")

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Answer 1

Voss 2022-2-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1648295-how-to-loop-on-different-snr-values-in-matlab#answer_894560

编辑：Voss 2022-2-12

在 MATLAB Online 中打开

Looks like you have it essentially right; you just need to use the decimal specifier %d (or %03d or whatever makes sense) rather than the string specifier %s in the sprintf format for the index p (and maybe some underscores for readability):

% Made up variables.
dataDirectory = '';
fileNameRoot = 'result';
modulationTypes = ["QAM" "PSK"];
modType = 1;
numFramesPerModType = 2;
for SNR=[-20,-10,0,10,20,30]
    for p=1:numFramesPerModType
        fileName = fullfile(dataDirectory,...
            sprintf("%s_%s_%d_%03d_SNR",fileNameRoot,modulationTypes(modType),p,SNR))
    end
end
fileName = "result_QAM_1_-20_SNR"
fileName = "result_QAM_2_-20_SNR"
fileName = "result_QAM_1_-10_SNR"
fileName = "result_QAM_2_-10_SNR"
fileName = "result_QAM_1_000_SNR"
fileName = "result_QAM_2_000_SNR"
fileName = "result_QAM_1_010_SNR"
fileName = "result_QAM_2_010_SNR"
fileName = "result_QAM_1_020_SNR"
fileName = "result_QAM_2_020_SNR"
fileName = "result_QAM_1_030_SNR"
fileName = "result_QAM_2_030_SNR"

The way you had it, with %s for p, the file names each contain a non-alphanumeric character (characters whose ASCII code is 1, 2, etc.). These gave me an error when using save() on my version of MATLAB, but here they seemed ok. In any case, if you want to see the value of p in the file name, use some variant of %d instead of %s.