Why do i get the error "Index exceeds matrix dimensions. Error in fingerprinting (line 6) song1=song1(1:44100);" in my code

• * * Item one
• * * Item twoMy code is :
• function fingerprinting %main routine for fingerprinting and matching
• %write reference wav-files ("Library") into vectors
• clear all;
• clc;
• song1=wavread('song1.wav');
• song1=song1(1:3*44100);
• song2=wavread('song2.wav');
• song2=song2(1:3*44100);
• song4=wavread('song4.wav');
• song4=song4(1:3*44100);
• %write sample wav-file into vector
• sample=wavread('sample.wav');
• sample=sample(1:3*44100);
• %create signatures of reference files and sample
• FP1=fingerprint1(song1);
• FP2=fingerprint1(song2);
• FP4=fingerprint1(song4);
• FPS=fingerprint1(sample);
• %calculate similarity between the reference FP and the sample FP
• M1=eq(FPS,FP1);
• M2=eq(FPS,FP2);
• M4=eq(FPS,FP4);
• %sum up number of equal digits
• s1=sum(M1);
• s2=sum(M2);
• s4=sum(M4);
• com1=sum(s1);
• com2=sum(s2);
• com4=sum(s4);
• %look for a perfect match
• match=0;
• if com1==4608 %max. equal digits
• fprintf('perfect match with song 1')
• match=1;
• end
• if com2==4608
• fprintf('perfect match with song 2')
• match=1;
• end
• if com4==4608
• fprintf('perfect match with song 4')
• match=1;
• end
• %if there is no perfect match, find best match
• if com1>com2
• if com1>com4
• if match==0
• fprintf('song 1 is closest match')
• end
• end
• end
• if com2>com1
• if com2>com4
• if match==0
• fprintf('song 2 ist closest match')
• end
• end
• end
• if com4>com1
• if com4>com2
• if match==0
• fprintf('song 4 ist closest match')
• end
• end
• end;
• Fingerprint extraction:
• function H=fingerprint1(song) %fingerprint extraction
• A=auditoryfbank(song, 44100); %bandpass filtering using the pre-designed filterbank
• B=A.*A; %energy calculation
• H=zeros(256,18);
• %calculating the energy difference between two adjacent bands in two subsequent time frames
• for n=2:256
• for m=1:17
• H(n,m)=B(n,m)-B(n,m+1)-(B(n-1,m)-B(n-1,m+1));
• if H(n,m)>0
• H(n,m)=1;
• else
• H(n,m)=0;
• end
• end
• end;

[Jan]

Do not start each line with a star. See the "? help" link to learn how to format code in this forum.

clear all on top of a function is 1. meaningless, 2. wastes time by forcing Matlab to reload all functions from the slow hard disk, 3. deletes all valuable breakpoints of the debugger.

Answer 1

[David Sanchez]

Your code says:

song1=song1(1:3*44100);

what assumes that song1 is at least a 1x132300 array. It seems that song1 is smaller than that.

[Shweta]

Thnx sir ... So what size should i use instead ??

[Jan]

@Shweeta: We cannot guess, what you want. But at least you cannot exceed the maximum index:

song1 = song1(1:min(3*44100, numel(song1)))

But the same problem might occur for the other files also: You cannot crop the elements behind 3*44100, when the data have less elements.