MATLAB: Need help for these two commands

cat

These are two lines

dif = length(sig) – length(ADSR);

x = cat(2, ADSR, zeros(1,dif));

What is purpose of zeros(1,dif) Plz explain

Best Answer

It is appending (padding) zeros on the end of ADSR so that the total length of x is the length of the signal, sig:

length(ADSR)+ (length(sig)-length(ADSR))

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MATLAB: Need help for explanation of one command

This is the code Walter provided in your previous question. It's a different way to do zero-padding.

Conventional Way: (assume ADSR is a 1xn vector)

x=ADSR; x=[ADSR,zeros(1,100)];

Walter's suggestion is to set x to be all zero first and then copy the value of ADSR to the beginning of x, that is what x(1:length(ADSR)) = ADSR does.

The potential issue is to make sure the length of x is bigger than the length of ADSR. Otherwise, x will end up with the same as ADSR.

MATLAB: Question about length function

length returns the maximum of n and m:

>> help length
 length   Length of vector.
    length(X) returns the length of vector X.  It is equivalent
    to MAX(SIZE(X)) for non-empty arrays and 0 for empty ones.

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MATLAB: Need help for explanation of one command

MATLAB: Question about length function

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