I needed to find logistic regression using table of given values, but the calculator is still giving me"singular matrix" in response. What does it mean and what should be done to solve the problem?

I had this problem as well...Were you working on a SinReg equation by any chance? I was able to do every other type of regression (Linear, quadratic, cubic, ect..) In order to get Sinusoidal regression you need to make sure you arrow down to the Period box when entering the equation, and fill it in with the number of items in your table of values (a ten item list means a period of 10). That was the fix for me, so hopefully it works for you!

Posted on Feb 04, 2009

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Posted on Jan 02, 2017

What's the determinant of the numbers in matrix A? A singular matrix is a matrix whose determinant is zero.

Mar 06, 2014 | Texas Instruments TI-84 Plus Calculator

Open the Matrix function by pressing 2nd [x^-1]>EDIT.

Once Matrix is created, press [2nd][x^-1]>MATH>[1:det(] complete the matrix name and then press ENTER. If matrix is non-singular, you will get your answer.

Once Matrix is created, press [2nd][x^-1]>MATH>[1:det(] complete the matrix name and then press ENTER. If matrix is non-singular, you will get your answer.

Nov 29, 2012 | Texas Instruments TI-84 Plus Silver...

Not all matrices are invertible. The matrice must be square.The matrix must be non-singular: Its determinant must be different from 0. Your error comes probably from the key you used to calculate the inverse. Use the reciprocal key, the one marked with x^-1. If the marking is not ON the key, use the SHIFT button prior to pressing the relevant key.

Sep 04, 2011 | Casio FX-115ES Scientific Calculator

A singular matrix has no inverse. It's the equivalent of zero: trying to take the inverse of zero is an error. Check the matrix to make sure you have entered it correctly. If the error persists, could you post the matrix in question?

Dec 10, 2010 | Texas Instruments TI-84 Plus Calculator

your value is not within the domain of the function, that is why it's giving you that error message, try the value times -1, or -(your value)

May 01, 2010 | Texas Instruments TI-89 Calculator

- Press [2nd] [X to -1] under [MATH[ to access the (Matrix) menus.
- Use right arrow to highlight [EDIT]
- Press [1:A] to edit (create from scratch) the A matrix.
- On the line MATRIX[A] line cursor blinks on 1
- Enter m dimension (3) and press [ENTER].
- Cursor moves to the second dimension (n). type 3.
- Press [ENTER].
- A 3x3 matrix template is displayed with A_11 element highlighted.
- Replace the value 0 with your value for A_11.
- Press [ENTER].
- Type a value and press [ENTER].
- When finished, press [2nd][QUIT] to exit the matrix editor.

Feb 03, 2010 | Texas Instruments TI-83 Plus Calculator

If a matrix has a determinant of 0, this error appears. If you get this error, your matrix doesn't have an inverse.

Jun 02, 2009 | Texas Instruments TI-84 Plus Silver...

The problem is with the data. The calculator is telling you that your matrix is singular. Inverting a singular matrix is analogous to dividing by 0. Just as you can't divide by 0, you can't invert a singular matrix.

If you think that the inverse exists, double check the entries in the matrix.

If you think that the inverse exists, double check the entries in the matrix.

Apr 19, 2009 | Texas Instruments TI-83 Plus Calculator

Information regarding singular Matrix can be found on Texas Instruments Knowledge Base which can be accessed by clicking on the URL below:

http://epsstore.ti.com/OA_HTML/csksxvm.jsp?nSetId=70965&nUsePub=NO&jttst0=6_23871,23871,-1,0,&jtfm0=&etfm1=&jfn=ZG4DFC2561D832E9A7B8E3D67D02A142E36C32198B223B8B735B80EB41E1A4C06C1D6FD81FCE2A573E09CA38076BEBE3A38E

http://epsstore.ti.com/OA_HTML/csksxvm.jsp?nSetId=70965&nUsePub=NO&jttst0=6_23871,23871,-1,0,&jtfm0=&etfm1=&jfn=ZG4DFC2561D832E9A7B8E3D67D02A142E36C32198B223B8B735B80EB41E1A4C06C1D6FD81FCE2A573E09CA38076BEBE3A38E

Feb 07, 2008 | Texas Instruments TI-83 Plus Calculator

Here are a few things to try.

First, I'd check whether the students put the data

into lists other than L1 and L2. If you do SinReg

with no arguments, the machine defaults to using L1

and L2.

Second, check degree versus radian mode.

Third, I have had problems in the past with SinReg

when the data were *too good*. I think a singular

matrix might be the culprit in a case like this, but I

doubt that's the problem here. If you think it might

be, try deleting every other data point and try the

regression again.

First, I'd check whether the students put the data

into lists other than L1 and L2. If you do SinReg

with no arguments, the machine defaults to using L1

and L2.

Second, check degree versus radian mode.

Third, I have had problems in the past with SinReg

when the data were *too good*. I think a singular

matrix might be the culprit in a case like this, but I

doubt that's the problem here. If you think it might

be, try deleting every other data point and try the

regression again.

Jan 04, 2008 | Texas Instruments TI-84 Plus Calculator

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I used Logistiv Regression, not sinusoidal one....

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