How do I get my lowpass and highpass filter using the Signal Analyser App for variable x.

I can get for y, However, for my x, I could not even do the spectrum. Below is my m.file that I did to transfer the variables to my workspace.

clc

T1 = readtable('combined2wf_500.xlsx');

vars = T1.Properties.VariableNames;

figure(1)

hold on

plot(T1{:,1})

plot(T1{:,2})

x = (T1{:,2});

y = (T1{:,1});

grid on

xlabel('Time (in secs)')

ylabel('Voltage (in V)')

Answer 1

[Raghava S N]

Hi @nao,

After running the script you have provided, on running the command

any(isnan(x))

the output is a logical 1. This means that there are missing values in the variable "x" represented by Nan. This is the reason the signal analyzer app is not allowing you to pre-process the variable "x" using filters and visualize its spectrum.

Consider replacing the Nan values with a suitable placeholder to be able to use the features of the signal analyzer app. This can be achieved using the "fillmissing" function. For more details, refer to this documentation link - https://www.mathworks.com/help/matlab/ref/fillmissing.html

Hope it helps!

[Frantz Bouchereau]

Signal Analyzer app now supports filling missing data directly in its preprocessing mode. Fill the missing data first and then apply your filter(s).