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14 lines
561 B
Mathematica
14 lines
561 B
Mathematica
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function a = matrixA(n) % We want n rows and columns in the matrix
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a = zeros(n, n); % in order to save speed we preallocate zeros to the vector
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for i = 1 : n % we iterate through rows
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for j = 1 : n % we iterate through columns
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if i == j % as per problem description on how to fill the matrix
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a(i, j) = 9;
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elseif i == j - 1 || i == j + 1
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a(i, j) = -3;
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else
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a(i, j) = 0;
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end % end if
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end % end column for
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end % end row for
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end % end function
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