x=[1 4;8 3] %initialize matrix $octave -qf --no-window-system demo.m inverse(r) %inverse of above matrix X = 1. 4 diag(y) %diagonal og matrix 8 3 sum(x) %sum of each column warning: function ./demo.m shadows a core library function error: 'r' undefined near line 3 column 9 error: execution exception in demo.m sum(sum(k)) %sum of all columns sum transpose(x) %transpose of matrix

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