# sum first matrix and second matrix

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abdullah qasim on 12 Jan 2019
Commented: Walter Roberson on 17 Feb 2019
I want to collect the first function and the second function but there is an error there is no help ('Xf ').
x=[-1 8 2 -3 -5 6 -4 5 -8 7 -9 4 5 -10 -6 -11 8 3 7 1 -5 -20 14 18 19 -16 8 16 -17 -15];
Xp=x(x>0);
Xn=x(x<0);
figure(1)
stem(Xn);
title('negative signal');
Xn=abs(Xn);
figure(2)
stem(x);
title('orginal signal');
figure(3)
stem(Xp);
title('positive signal');
figure(4)
stem(Xn);
title('abs negative signal');
Xf=Xp+Xn;

Walter Roberson on 12 Jan 2019
Your Xp and Xn are different lengths. You cannot add them. And if you could, what would the answer mean ?

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Walter Roberson on 12 Jan 2019
Okay, so transmit them. Just keep in mind they are different lengths.
You can concatenate them if you have reason to,
[Xn, Xp]
but you would need to keep track of the size of at least one of the two if you need to separate them out again.
abdullah qasim on 17 Feb 2019
How can I keep track of the size of at least one of the two if I need to separate them out again?
Walter Roberson on 17 Feb 2019
XNsize = length(Xn);
[XNsize, Xn, Xp]