How to match the matrix dimension ?

clc
clear all
close all
load ('C:\Users\manish\Downloads\100ml.mat')
val=val';
plot(val)
I=val((1:end),1);
str1=dec2bin(typecast(int8(I),'uint8'));
ecg_signal_I=filtering(I);
c1=dec2bin(typecast(int8(ecg_signal_I),'uint8'));
figure 
title('I')
plot(ecg_signal_I)
ylim([-1000 1000])
sampling_frequency = 360;
mains_coeff = 0.1;   % Amplitude of mains line to change. Depends on your ECG signal.
time_step = 1/sampling_frequency;
max_time = 2;    % Duration of your signal in seconds.
t = time_step:time_step:max_time;    % This is our time vector.
mains_signal = cos(2*pi*110*t);       % 110Hz mains frequency. Depends.
dirty_signal = val' + mains_coeff*mains_signal;
plot(dirty_signal);

I am getting error in second last line of the above code: Matrix dimensions must agree.

Error in c100ml2 (line 21)

dirty_signal = val' + mains_coeff*mains_signal;

[James Tursa]

What are the dimensions of the variables that cause the error?

[manish kumar]

"Val" are of 3600*1 double and "Main_signal" are of 1*720 .

Answer 1

[KSSV]

Val" are of 3600*1 double and "Main_signal" are of 1*720

How do you expect them to add? YOu need to do interpolation and get them to the same dimensions. Read about interp1