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Yes, they changed the function(ing) of READPRN.
READPRN used to work with this kind of files (A textual header above the table of numbers) since MathCad 8 or earlier. One more thing broken by PTC.
I guess now you have to use
READTEXT("filename","delimited"," ")
And then you have to strip off the first row of the result array.
Which means you can write your own READPRN, like this:
The function StripHeader() checks if the first element of matrix M is a string, if so, it strips off its first row.
This function is used by:
Now use it:
and plot:
Success!
Luc