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Suppose we have a continuous time function \$f(t)\$ , we sample it at frequency \$f_s, (t = -5:1/f_s:5)\$, and store it in an array \$a\$ in Matlab. Now we convolve it with itself using \$b = conv(a,a)\$. What is the new time axis array for the convolved function stored discretely in array \$b\$ ?

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the new x-axis should be the lag between the signals. Since your signal is a digital signal, the x-axis is N, where N is the number of samples ahead or behind the the original signal.

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