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TV_kmi3-Newcomer
3-Newcomer
August 21, 2023
Solved

Falsely read complex numbers from a textfile

  • August 21, 2023
  • 3 replies
  • 2457 views

I am using Mathcad Prime Release 9.0 and Datecode9.0.0.0

Hello.
When reading complex numbers from a text file (1 complex floating point value per line) into a vector, the following phenomenon appears: From the samples 500, 1000, 1500, ... (sample counting 0, 1, 2, ...) only the real part enters into the vector. I searched the vicinity of sample 500 for special characters that are invisible on the screen, but could eventually cause skipping the imaginary part during the reading procedure. I didn't find any special character except 0D and 0A (hex) "carriage return", "line feed"

Here are the errors that I faced
No error message or warning

Best answer by LucMeekes

Ah, I see you are using Prime, and probably used the READFILE function, with "delimited" as the second argument.

Guess there's a bug in that function:

LucMeekes_0-1692949273081.png

You should consider reporting that bug.

Unfortunately READPRN is not capable (anymore) to read such files. Seems like PTC managed to ruin that function going from Mathcad to Prime:

LucMeekes_1-1692949375371.png

But there's a work-around. If you edit the .txt file with notepad, replace all + with a space character and all i with nothing and save the result (as a text file with e.g. extension ".PRN" instead of txt),  you can read this file with READPRN. You get a matrix with two columns as I showed earlier, from which you can reconstruct the array of complex values.

 

Success!

Luc

3 replies

V
24-Ruby III
VladimirN24-Ruby III
24-Ruby III
August 21, 2023

Please upload your text file here.

    T
    TV_kmi3-NewcomerAuthor
    3-Newcomer
    August 22, 2023

    The textfile is named "224015_TFHF_sm_trunc300Hz.txt". No header, One column, One complex number per line.

    L
    LucMeekes23-Emerald IVAnswer
    23-Emerald IV
    August 25, 2023

    Ah, I see you are using Prime, and probably used the READFILE function, with "delimited" as the second argument.

    Guess there's a bug in that function:

    LucMeekes_0-1692949273081.png

    You should consider reporting that bug.

    Unfortunately READPRN is not capable (anymore) to read such files. Seems like PTC managed to ruin that function going from Mathcad to Prime:

    LucMeekes_1-1692949375371.png

    But there's a work-around. If you edit the .txt file with notepad, replace all + with a space character and all i with nothing and save the result (as a text file with e.g. extension ".PRN" instead of txt),  you can read this file with READPRN. You get a matrix with two columns as I showed earlier, from which you can reconstruct the array of complex values.

     

    Success!

    Luc

      L
      LucMeekes23-Emerald IV
      23-Emerald IV
      August 25, 2023

      What did you use to read the file.

      I used READPRN, resulting in a 2 column matrix, the first column contains the real parts, the second column contains the imaginary parts:

      LucMeekes_1-1692944673915.png

      LucMeekes_2-1692945106930.png

       

      Success!
      Luc

       

      M
      MichaelW17-Peridot
      17-Peridot
      September 26, 2023

      This issue has been reported to PTC R&D to determine how to resolve the issue

       

      Status:

      CS401987 Reading complex numbers from a text file (1 complex floating point value per line) into a vector using READFILE() or READTEXT() works fine, except that lines 500, 1000, 1500, etc. get just the real part, miss the complex part in Mathcad Prime

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