Gmtselect issue with output columns (again!)

Q&A
1

Seems me and gmtselect just don’t get along!

Trying to specify input and output columns.

(File “point.txt” contains “150.0 40.0”)

gmtselect <<END -Cpoint.txt+d100k -fg
150.1 40.1 A
150.2 40.1 B
END

Gives:

150.1 40.1 A
150.2 40.1 B

(as expected)

gmtselect <<END -Cpoint.txt+d100k -fg -o2,1,0
150.1 40.1 A
150.2 40.1 B
END

Gives:

NaN 40.1 150.1
NaN 40.1 150.2

Why isn’t column 2 output?

Tried specifying it as input (just in case this is what is expected):

gmtselect <<END -Cpoint.txt+d100k -fg -i0,1,2 -o2,1,0
150.1 40.1 A
150.2 40.1 B
END

Gives:

NaN 40.1 150.1
NaN 40.1 150.2

Seems it only works when long/lat are the first two columns.
Any idea what’s going on?
R

2

OK. Just realised that it’s getting upset because the extra columns are text and not numbers.
Why can’t it just pass the text columns?

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3

All numerical columns come first, follow by any trailing text. See https://docs.generic-mapping-tools.org/dev/cookbook/options.html#input-columns-selection-the-i-option
If you want text in the position of x and y then awk is your only option.

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