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Odd issue with the -Xc option in modern mode #9278
Description
To start, I'm not entirely sure why -Xc was removed for modern mode (-Xf too, although i'm not using it).
I encountered a weird issue with using the gmt begin -C flag, that seems to trick GMT into not using modern mode.
gmt begin test1 ps
gmt basemap -R0/1/0/1 -JX4i -Baf -Xc
gmt end
gmt begin test2 ps -C
gmt basemap -R0/1/0/1 -JX4i -Baf -Xc
gmt end
Only the test2.ps plots because the -C seems to not initialize modern mode? I'm not sure whats happening here, but I can get around the issue by setting anything that would be in gmt.conf within each script.
For reference, here was what was in my gmt.conf:
#
# GMT 6.7.0 Defaults file
#
# COLOR Parameters
#
COLOR_BACKGROUND = black
COLOR_FOREGROUND = white
COLOR_NAN = white
#
# FONT Parameters
#
FONT_ANNOT_PRIMARY = 8p,Helvetica,black
FONT_ANNOT_SECONDARY = 8p,Helvetica,black
FONT_LABEL = 12p,Helvetica,black
FONT_TITLE = 10p,Helvetica,black
#
# FORMAT Parameters
#
FORMAT_GEO_MAP = ddd.xx
#
# GMT Miscellaneous Parameters
#
GMT_CUSTOM_LIBS = /usr/local/lib/mbsystem.so
#
# MAP Parameters
#
MAP_ANNOT_OFFSET_PRIMARY = 5p
MAP_FRAME_WIDTH = 3p
#
# Projection Parameters
#
PROJ_LENGTH_UNIT = inch
#
# PostScript Parameters
#
PS_MEDIA = letter
PS_PAGE_ORIENTATION = landscape
GMT version: 6.7.0
Linux Ubuntu 22.04
Activity
joa-quim commentedon Oct 22, 2026
Those commands work for me. Better to discuss this on the Forum in case of doubts than to open issues.
ESaltPi commentedon Oct 23, 2026
Intended, see:
#4735
https://forum.generic-mapping-tools.org/t/gmt-modern-mode-xc-option/6503/2