MATLAB: Plotting numbers of main diagonal

graphplotting

I have a matrix that in the main diagonal has values that vary slightly from 1, almost an identity matrix. How would i plot a graph with all the data in a way that each row represents a of the matrix represents it's own line of values? For example, on the first row there is a one and the rest is zeros, so it would be a line with a peak on the one and the rest a straight line, the second row there is a row on the second row, second column so a peak there and so one forming one big graph showing all the peaks.

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 surf(yourMatrix,'FaceColor','none');

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MATLAB: Main diagonal operations problem

Using Roger Stafford's FEX submission randfixedsum (must be downloaded first):

https://www.mathworks.com/matlabcentral/fileexchange/9700-random-vectors-with-fixed-sum

>> N = 4; % matrix size
>> M = nan(N,N); % preallocate
>> V = 0.3+(1-0.3)*rand(1,1) % diagonal value
V =
      0.47505
>> M(~eye(N)) = randfixedsum(N-1,N,1-V,0,1); % other values
>> M = M.'; % transpose
>> M(1:N+1:end) = V % assign diagonal value
M =
      0.47505      0.40657    0.0087969      0.10958
      0.12917      0.47505      0.21287       0.1829
      0.35794      0.15519      0.47505     0.011825
      0.41335     0.032696     0.078907      0.47505

Checking the sum of each row:

>> sum(M,2)
ans =
     1
     1
     1
     1

and diagonal:

>> diag(M)
ans =
      0.47505
      0.47505
      0.47505
      0.47505

MATLAB: How can i change the 1st row 1st column and last row last column values in a tridiagonal matrix

A(1,1) = 17;A(end,end) = 23;

You can create your original matrix without using a loop:

n = 5;
A = diag(ones(1,n))*300-diag(ones(1,n-1)*100,-1)-diag(ones(1,n-1)*100,1);

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MATLAB: Main diagonal operations problem

MATLAB: How can i change the 1st row 1st column and last row last column values in a tridiagonal matrix

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