How to plot vertical line from X Axis to values on graph?

Hi,

Ive got a fft plot with values linked by a line however, I would like the values to be plotted as a straight vertical line down to the x axis so that it just shows each frequency. I havent been able to find a possible way of doing this anywhere. Help on how to do this is very much appreciated.

Answer 1

[Star Strider]

The easiest way to do this is to use the stem function.

Example —

f = 0:0.05:pi;                                          % Create Frequency Vector
A = rand(size(f));                                      % Create Fourier Transform Amplitude Vector

figure
plot(f, A, '-b')
hold on
stem(f, A, '-r', 'Marker','none')                       % Plot ‘stem’ Without Markers
hold off
grid

This plots the Fourier transform amplitudes with a blue line, and with red stem lines. Change the various properties to get the result you want.

[ImperialStar]

Ah perfect! Much appreciated.

[Star Strider]

As always, my pleasure!