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Cofactor matrix how do you find the cofactor matrix using the fx-115es?

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The cofactor (C) of Matrix (A) = (det(a) times (A)^-1)t

Cof A=(detAxA^1)t

Enter a matrix for (MatA) AC
shift 4 7 gives det(_
shift 4 3 shows det(a )<-end Paren
= x shows ansx
shift 4 3 shows ansxMatA -1x
= you'll see a Matrix AC to get out
shift 4 8 gives Trn(
shift 4 6 shows Trn(MatAns) =


The Matrix graph shows all the Cofactors

Posted on Jun 20, 2009

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How to find adjoint of a matrix


This is a rather involved question and your calculator has pretty basic matrix capabilities.
The adjoint of a matrix is the transpose of the matrix of cofactors. For each element of the original matrix, you must calculate its cofactor and insert it at the same place as the element. Once you get the matrix of cofactors, you take its transpose.
As you see that will not be easy to explain without an example. Please consult a book on linear algebra. And NO, your calculator cannot perform such a feat even for a 3X3 matrix.

Sep 12, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

How i do matrix equations on my fx-115ES calculator?


1. press mode 2. select the option matrix (6) 3.select matrix A,B or C 4 select (m x n) 5 input matrix 6 repeat steps1-5 if u are using more than 1 matrix. (select another matrix (A,B or C) in step 3) 7 press shift and 4 and select the required functions. (mat A x mat B or det mat A etc..)

Jan 09, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

On which calculator can i solve 6*6 matrix


If you want to manipulate 6x6 matrices, you can use one of the CASIO Graphing calculators, such as theCFX-9850GPlus, or the FX-9750G plus.
Graphing calculators from other manufacturers can also handle such matrices. The FX-115ES can handle matrices with dimensions up to 3x3.

Nov 25, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

How do i solve a matrix?


What do you mean by "solve a matrix"? Find the inverse? Find the determinant? Find the solution to a system of linear equations? Within limits the fx-115ES can do any of these and more.

The procedures are described in the "Matrix Calculations" section of the manual. If you still have problems, please reply to this post specifying what you want to do.

Nov 18, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

How to input numbers to solve a matrix using a casio fx-115es


Press MODE 6 to get into matrix mode. Note: do this only once. If you do it again, it will erase all your matrices. Pick the matrix, set its dimension, then the calculator will put up a screen allowing you to enter/edit the matrix elements. At any time you're in matrix mode, press SHIFT 4 to bring up the matrix menu.

All this is explained in the manual beginning on page E-57. If you've misplaced the manual, you can download a copy from
http://support.casio.com/manualfile.php?rgn=1&cid=004001004

Nov 08, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

Can we use in matix complex mode (3 + 4i) ???????????


No. The fx-115ES only allows real numbers in matrix mode.

Oct 29, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

How to find the cofactors?


There is no command on the calculator that allows you to do it.
You can use the calculator to evaluate the minors for each element (the determinant of the matrix that is left when you remove the column and the row that have that element as intersection).
Here is an example how to calculate the cofactor of the _11 element of a 3X3 matrix.
76902ff.jpg
  1. I defined a 3x3 matrix called b
  2. I defined a submatrix by removing the first row and the first column of the b matrix.
  3. The submatrix is called min11.
  4. Its determinant is the minor of the _11 element of matrix b.
  5. The cofactor cof11 of _11 element of matrix b is the product of (-1) to the the power (1+1) and the minor of the _11 element.
  6. The cofactor is represented by the last result to the right of ->cof11, that means b22*b33-b23*b32.
  7. For additional information refer to your algebra book.

Jan 27, 2010 | Texas Instruments TI-83 Plus Calculator

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I need to find the cofactor of a matrix using casio fx-115es calculator, i found a post with a solution but at this point: shift 4 3 shows ansxMatA -1x = you'll see a Matrix AC to get out, nothing happens...


Since the largest matrix you can create on the FX-115ES is a 3X3 matrix, I am not sure it is worth it to do it on a calculator.

There is no command on the calculator that allows you to do it.
You can use the calculator to evaluate the minors for each element (the determinant of the matrix that is left when you remove the column and the row that have that element as intersection).
Here is an example how to calculate the cofactor of the _11 element of a 3X3 matrix.
76902ff.jpg
  1. I defined a 3x3 matrix called b
  2. I defined a submatrix by removing the first row and the first column of the b matrix.
  3. The submatrix is called min11.
  4. Its determinant is the minor of the _11 element of matrix b.
  5. The cofactor cof11 of _11 element of matrix b is the product of (-1) to the the power (1+1) and the minor of the _11 element.
  6. The cofactor is represented by the last result to the right of ->cof11, that means b22*b33-b23*b32. The cofactor is a number.
  7. For additional information refer to your algebra book.
Note: The power of -1 that multiplies the minor of an element is
(-1)^(row number + column number).
coff11=((-1)^2)*det(min11) =det(min11)
cof12=((-1)^(1+2))* det(min12)=-det(min12)
cof13=((-1)^(1+3))*det(min13)= det(min13)
cof21=((-1)^(1+2))*det(min21)= -det(min21)
etc.

Jan 26, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

Weather casio FX-115ES can solve 5*5 matrix


According to the manual for the Casio FX115ES, the largest matrix it solves is a 3x3.

Sep 06, 2008 | Casio FX-115ES Scientific Calculator

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