MATLAB: Undefined function or variable ‘sigshift’. how can i shift the signal

MATLABsignal processing

i got this code

nx = [-3:3]; x = [-4 5 1 -2 -3 0 2];
subplot(2,2,1);
stem(nx,x); 
axis([-4 8 -5 9]);
ny = [-1:5];
   y = [6 -3 -1 0 8 7 -2];
subplot(2,2,2);
stem(ny,y); 
axis([-4 8 -5 9]);
[c,nc]=sigshift(y,ny,2);
subplot(2,2,3);
stem(nc,c); 
axis([-4 8 -5 9]);
[u,nu] = sigadd(x,nx,c,nc);
subplot(2,2,4);
stem(nu,u); 
axis([-4 8 -5 9])

and i got =>

Undefined function or variable 'sigshift'.
Error in hw2a (line 9)
[c,nc]=sigshift(y,ny,2);

Best Answer

sigshift() is a minor function that can be found in http://www.mathworks.com/matlabcentral/fileexchange/2189-digital-signal-processing-using-matlab

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MATLAB: How to modify a matrix to change the entries >=0 and multiply it by 5 AND to change the entries <0 and add 2 to those entries

Start with "If an entry in B is greater than or equal to zero": You can either run a loop over all elements of B or use "logical indexing":

% Linear indexing:
for k = 1:numel(B)
   if B(k) >= 0
     ...
   end
end

Or two indices for rows and columns:

for r = 1:size(B, 2)
  for c = 1:size(B, 1)
    if B(r, c) >= 0
       ...
    end
  end
end

Or "logical indexing":

index = (B >= 0);
disp(B(index))

Now try to use this to modify B. Use the mentioned terms to search in the documentation and in the internet.

MATLAB: How can i solve

xyz = [-4  3  0;  8  12  7;  6  -6  -5]\[4; 0; -10];

Best Answer

Related Solutions

MATLAB: How to modify a matrix to change the entries >=0 and multiply it by 5 AND to change the entries <0 and add 2 to those entries

MATLAB: How can i solve

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