MATLAB stem()

A two-dimensional stem plot shows data as lines extending from a baseline along the x-axis. A circle (the default) or another marker whose y-position represents the data value terminates each stem.

Syntax

stem(Y) // It plots the data sequence Y as stems that extends from equally spaced and automatically created values along the x-axis. When Y is a matrix, stem plot, all items in a row against the same x value.
stem(X,Y) // It plot X versus the column of Y. X and Y are vectors or matrices of a similar size. X can be the row or a column vector, and Y is a matrix with length(X) rows.
stem(...,'fill') // It specifies whether to color the circle at the end of the stem.
stem(...,LineSpec) // It specifies the line style, marker symbol, and color. 
h = stem(...) // It returns a vector of Stem objects in h.

Example

f=e^-t/5 sint,0≤t≤2π
t=linspace (0, 2*pi, 200);
f=exp (-.2*t).*sin(t);
stem(t, f)

Output:

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