3d graph

I have this code an I am trying to make the 3d graph.. could you help me??
thank you in advanced!!

>>[wave,fs]=wavread('your_file_name.wav'); /* read file into memory */
>>sound(wave,fs); /* see what it sounds like */
>>t=0:1/fs:(length(wave)-1)/fs; /* and get sampling frequency */
>>plot(t,wave); /* graph it
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