1. **x = x(end:-1:1);** %reverse a vector

2. **x( 3:5 ) = [];** % remove part of the vector

3. **fprintf('Some Text');** %Output a string without carriage return: some text>>

4. **m = min(x(:)); M = max(x(:));x = (b-a) * (x-m)/(M-m) + a;** %Rescale the entries of a vector x so that it spans [a,b]

5.

**[,I] = sort(abs(x(:)));**

x( I(1:end-n) ) = 0;%Keep only the n biggest coefficients of a signal x (set the others to 0).

x( I(1:end-n) ) = 0;

6. Resize an image M (new size is (p1,q1)).

**[p,q] = size(M);**% the original image

**[X,Y] = meshgrid( (0:p-1)/(p-1), (0:q-1)/(q-1) );**% new sampling location

**[XI,YI] = meshgrid( (0:p1-1)/(p1-1) , (0:q1-1)/(q1-1) );**

M1 = interp2( X,Y, M, XI,YI ,'cubic');% the new image

M1 = interp2( X,Y, M, XI,YI ,'cubic');

7. Compute the PSNR between to signals

**d = mean( mean( (x-y).^2));**

m = max( max(x(:)),max(y(:))

PSNR = 10*log10( m/d );

m = max( max(x(:)),max(y(:))

PSNR = 10*log10( m/d );

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