Question: plot command not working the way I want


The procedure I uploaded, was originally written in C++. I made a text file and plot the file with C++ without any problem.

But in the maple version of the same program, when I use the command:


some kind of problem occurs.I don't even understand the error message.


If I use the command:



 it works! But I want to work it in the  previous way.

I don't know how.


Can anyone help me plz?

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