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

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nao
nao 2023-7-8
评论： Frantz Bouchereau 2025-5-30
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)')

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回答（1 个）

Raghava S N
Raghava S N 2025-3-26
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!
  1 个评论
Frantz Bouchereau
Frantz Bouchereau 2025-5-30
Signal Analyzer app now supports filling missing data directly in its preprocessing mode. Fill the missing data first and then apply your filter(s).

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