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Understanding the following lines of code

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chaaru datta
chaaru datta 2024-1-24
评论： chaaru datta 2024-1-24
Hello all, I am trying to understand the meaning of following two lines of code, but not getting it clearly.
file_x_train = strcat( file_px, num2str(ii),'_M',num2str(M), '_N',num2str(N),'_', num2str(SNRdB),'dB.mat' );
file_h_train = strcat( file_py, num2str(ii),'_M',num2str(M), '_N',num2str(N),'_', num2str(SNRdB),'dB.mat' );
where, M = number of antennas, N = number of elements, SNRdB is a constant value say 10 decibels.
Any help in this regard will be highly appreciated.
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Stephen23
Stephen23 2024-1-24
Ran in:
A much better approach is to use SPRINTF.
M = 5;
N=10;
SNRdB = 10;
file_px = 'rawDatafileName';
ii = 2;
Compare:
sprintf('%s%d_M%d_N%d_%ddB.mat',file_px,ii,M,N,SNRdB)
ans = 'rawDatafileName2_M5_N10_10dB.mat'
strcat( file_px, num2str(ii),'_M',num2str(M), '_N',num2str(N),'_', num2str(SNRdB),'dB.mat' )
ans = 'rawDatafileName2_M5_N10_10dB.mat'
chaaru datta
chaaru datta 2024-1-24
Thanks a lot sir for your detailed response....

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akshatsood
akshatsood 2024-1-24
编辑：akshatsood 2024-1-24
HI @chaaru datta,
Based on my interpretation of your question, it appears you are requesting insight into the "strcat" function. From the code sample you have ve shared, it is being used to construct a filename for a MAT file by connecting together different segments, where 'M' and 'N' represent the number of antennas and elements, respectively.
file_x_train = strcat( file_px, num2str(ii),'_M',num2str(M), '_N',num2str(N),'_', num2str(SNRdB),'dB.mat' );
file_h_train = strcat( file_py, num2str(ii),'_M',num2str(M), '_N',num2str(N),'_', num2str(SNRdB),'dB.mat' );
To break it down consider each argument to the "strcat" function
  1. file_px - might be a file name (assuming file_px stores the file name 'file_px') => 'file_px'
  2. num2str(ii) - casts number (stored in variable "ii") to character array (assuming 0 as it is not given) => '0'
  3. '_M' => '_M'
  4. num2str(M) - converts M to character array (assuming 20 as it is not given) => '20'
  5. '_N' => '_N'.
  6. num2str(N) - converts N to character array (assuming 5 as it is not given) => '5'
  7. '_' => '_'
  8. num2str(SNRdB) - converts SNRdB to character array (which is 10 as provided) => '10'
  9. 'dB.mat' => 'dB.mat'
Hence, "strcat" function will concatenate all the strings(in monospace at the end of each point) and store the result in the respective variables "file_x_train" and "file_h_train".
Hence, the variable file_x_train = file_px0_M20_N5_10dB.mat
I hope this helps.

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Aquatris
Aquatris 2024-1-24
编辑：Aquatris 2024-1-24
Ran in:
My guess is the code is used to generate a name for a mat file after performing some postprocessing on raw data from 'file_px'.
So file_px is probably an excel sheet with data in it. Then probably some post-processing is done on the data from the excel sheet and the results needs to be saved. To have a meaningful name with the origin of the data, and some usefull info, they use the code. So just from the name of the mat file, you can see the info for _M SNR etc.,
M = 5;N=10;SNRdB = 10; % dummy postprocessed info from
file_px = 'rawDatafileName'; % dummy file name
ii = 2;
strcat( file_px, num2str(ii),'_M',num2str(M), '_N',num2str(N),'_', num2str(SNRdB),'dB.mat' )
ans = 'rawDatafileName2_M5_N10_10dB.mat'
So results show you that mat file contains data from 'rawDatafileName', has 5 antennas (_M5), has 10 elements (_N10) and has a SNR of 10dB (_10dB);

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