Function cg = colourgrade_streaked()
cg = colourgrade_streaked(cg)
cg = colourgrade_streaked(cg,m)
cg = colourgrade_streaked(cg,m,n)
cg = colourgrade_streaked(cg,[],n)
returns a struct cg with information on a
colourmap with "streaked" colours.
There are two distinct colourmaps, with at most
16 streaked colours (input argument m == 1),
and at most 31 colours (input argument m == 2).
If input argument n is given, a lesser number
of streaked colours is chosen.
All input arguments are optional; an
empty matrix [] indicates "no input
for that argument".
The function returns default grade values (if
cg.gradevalues has not been given at input),
and appends 3 extra colours for infra, ultra
and na/nan values to the streaked colourmap.
The function is directly responsible for the
following fields in the ouput struct cg:
cg.gradevalues (column vector of reals)
cg.colourmap (colourmap, an N*3 matrix
for N colours in total)
cg.icm_infra (row index to cg.colourmap)
cg.icm_min (row index to cg.colourmap)
cg.icm_max (row index to cg.colourmap)
cg.icm_ultra (row index to cg.colourmap)
cg.icm_nanan (row index to cg.colourmap)
The output struc cg contains also any
other fields with defaults defined by
m-file colourgrade_init.m.
The function internally calls the following
non-standard m-files:
reluxcolourmap.m
colourgrade_init.m
colourgrade_init_ngrade.m
(c) 2026 fabien van mook
2026.08.20 release of this file within package "fvm-colourgrade" under GNU GPLv3+
