# This is a text data file. It doesn't need to begin with a
# comment, although this one does. Comments and empty lines
# are ignored in text data files.
-1 1 # This is row 1. It contains two columns.
0 0 # This is row 2. Columns don't need to be lined up neatly.
1 1 # Row 3. Whitespace separates columns and is otherwise ignored.
1.5 2.25# Row 4. Most common formats for base 10 numbers are acceptable.
# Note, however, that only "." can be used to separate
# the integer and fractional parts ("," is treated as a
# column separator).
2 4 # Row 5 (the empty and comment lines aren't counted.)
2.5 6.25 8 # The "8" is ignored, since row 1 has only 2 columns.
3 9
4,16 # Comma-separated value (CSV) format is acceptable.
"5","25"# Quoted CSV format is also acceptable.
6 3.6e1 # Standard notation for floating-point numbers is acceptable.
7 490e-1# Here's another, with a negative exponent.
8 64.
9 +81.0 # The "+" is redundant, but acceptable.
10 1e2
# There can be more comments at the end ....