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To get matrix dim<br />
You can use <br />
[n_rows,n_col]=size(A)<br />
Then check if row &amp;&nbsp;col equals 3<br />
If so it is 3*3 matrix
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To get matrix dim
You can use
[n_rows,n_col]=size(A)
Then check if row & col equals 3
If so it is 3*3 matrix

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To find determinent of a square matrix just use <br />
D = det(A)<br />

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To find determinent of a square matrix just use
D = det(A)


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Example<br />
<a href="http://www.mathworks.com/help/techdoc/ref/det.html" rel="ugc">http://www.mathworks.com/help/techdoc/ref/det.html</a>
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Example
http://www.mathworks.com/help/techdoc/ref/det.html [http://www.mathworks.com/help/techdoc/ref/det.html]

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<div class="content wysiwyg-content">
The determinant of a 3X3 matrixis<br />
¿g h i¿ ¿¿<br />
det( A) = aei + bfg + cdh - afh - bdi - ceg<br />
¿a b c¿ A=¿d e f¿<br />
¿¿<br />
Think of this as being the sum of the products of each of the three elements in the three forward diagonals minus the sum of the products of each of the three elements in the backward diagonals. In the diagram below note how the first two columns of A are placed to the right of A. This makes the elements in the diagonals easy to see.<br />
I need a MATLAB function mdet3( A ) that first checks to see if A is 3X3. If the matrix is not 3X3, call the MATLAB error function with the message ‘Matrix not 3X3’to stop the processing. If the matrix is 3X3 calculate and return the determinant according to the above formula 1.
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The determinant of a 3X3 matrixis
¿g h i¿ ¿¿
det( A) = aei + bfg + cdh - afh - bdi - ceg
¿a b c¿ A=¿d e f¿
¿¿
Think of this as being the sum of the products of each of the three elements in the three forward diagonals minus the sum of the products of each of the three elements in the backward diagonals. In the diagram below note how the first two columns of A are placed to the right of A. This makes the elements in the diagonals easy to see.
I need a MATLAB function mdet3( A ) that first checks to see if A is 3X3. If the matrix is not 3X3, call the MATLAB error function with the message ‘Matrix not 3X3’to stop the processing. If the matrix is 3X3 calculate and return the determinant according to the above formula 1.

determinant of a matrix

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