and is one of the variables in that .mat file. You have to substitute your own signal, apparently ‘ChannelFirst’, for ‘openLoop’.
buttLoop error message code lifted from Matlab example 60 Hz hum
Using code from Remove the 60 Hz Hum from a Signal. srate = input ('Enter SAMPLE RATE for this subject(check log book!): '); ChannelFirst = data.ECG; Fs=srate; t =( 0:length(data.ECG)-1)/fs; plot(t,data.ECG); ylabel 'Voltage (V)', xlabel 'Time (s)' title 'Open-Loop Voltage with 60 Hz Noise' d = designfilt('bandstopiir','FilterOrder',2, ... 'HalfPowerFrequency1',59,'HalfPowerFrequency2',61, ... 'DesignMethod','butter','SampleRate',Fs); fvtool(d,'Fs',Fs) ; buttLoop = filtfilt(d,openLoop); ERROR THIS LINE
Kshitij Singh answered .
2025-11-20
load openloop60hertz, openLoop = openLoopVoltage;