Makecpt fails on some palettes

Q&A
1

Using GMT 5.5; makecpt fails on some palettes giving following error

makecpt: Error: CPT gray.cpt has no z-slices!

[Session gmt (0)]: Error returned from GMT API: GMT_CPT_READ_ERROR (8)

Offending command:
gmt makecpt -Cgray -T-250/250/50 -Z > gray.cpt

This has been working recently. Can’t figure out problem. Tried multiple color palettes. Some work. Some give this error. Tried different max/min/step combinations.

2

OK. More stuff I did.
Restart computer. Nope.
Reinstall GMT5.5. Nope.
Fired up GMT6.5 and ran makecpt. That worked. Maybe makecpt busted in older version.
Ran makecpt in GMT5.5 again (because I am lazy and know the old scripts). It worked.
I know nothing.

3

Get rid of this guy. The docs say 5.5 scripts run fine in 6.5

1 Like
4

Yeah, you’re right.
But I’m still scratching my head trying to figure out what broke. My money is on a corrupted path somewhere.

5

If it happens again, use the option -Vd to see better where it starts to fail.

6

OK. Thanks for the suggestion.