» help stem

STEM Discrete sequence or "stem" plot.
STEM(Y) plots the data sequence Y as stems from the x axis
terminated with circles for the data value.

STEM(X,Y) plots the data sequence Y at the values specfied
in X.

STEM(...,'filled') produces a stem plot with filled markers.

STEM(...,'LINESPEC') uses the linetype specifed for the stems and
markers. See PLOT for possibilities.

H = STEM(...) returns a vector of line handles.

See also PLOT, BAR, STAIRS.