I would like to create a plot where some of the points have a downward pointing arrow (see image below). In Astronomy this illustrates that the true value is actually lower than what's measured.Note that only some of the points have this symbol.
I would like to know how I can create such symbols in matplotlib. Are there downward arrow symbols that I can use?
Thanks for your help in advance!
When calling matplotlibs plot function, set a
caretdowndoesn't work for you, you can create your own marker by passing a list of (x,y) pairs, which are passed to a Path artist. x/y are 0…1 normalized coordinates that are scaled to the set marker size.
Pathinstance as a
marker, which allows even more flexibility.
$…$as a marker, where
…is arbitrary text, including Unicode characters, if your font supports it (should be the case these days). Downwards arrow in Unicode: ↓ (or
\u2193, resulting in
$\u2193$as the marker. Note that this must be a unicode string in Python 2.x [prepend u]). Unicode Block Arrows @ Wikipedia
Arrowinstance as marker, but I'm not sure whether that works.