Question about Toshiba Satellite M40-S417TD Notebook

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Matrix like display

Had 2 bars on the screen some time back,now can not use my lp as can see symbols, aphabets and nubber on the screen,i think the graphic card in got,i did open the lp and also removed the graghic card fruno:V000054110 (ATI 64MB), no know where to find one .

MY IS A M40-331

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  • gee1 Jan 07, 2008

    open up the laptop again and put the graphic card back in make sure you have not made any metal touch make sure everything gos back the same way restart laptop gee1

  • tarkes Jan 10, 2008

    thank for the help,but still not ok.

    also did disconect the lcd and did conect an other screen to,the problem remain.



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When you get all those letters and weird codes on the screen, does it do that at the POST screen? If so, the only way to really troubleshoot that problem is to have another ATI video chip to replace. Other than that, i would check the LCD display for a short. you would have to take the plastic cover off and look for the ground wire (use a multi-meter to determind this). If the ground is not properly secure, then secure it with electrical tape.

Posted on Jan 07, 2008

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It looks as though the video driver is corrupted. Can you go into safe mode and uninstall the last or updated driver?

Posted on Jan 07, 2008


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Verticall bar on the screen

A vertical bar is frequently a sign that the matrix decoder has failed.

The usual solution is to replace the display panel itself. Dependent upon the model, sometimes this may not be economically viable.

There is also a possibility that the connexion between the display panel and the motherboard may have come loose. Try removing the connexion and replacing it before you replace the display panel.

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Hi my name is paul and I'm trying to get more help for Statistics, there was help for finding mean, but i can't find help for standard deviation. Also, for another professor I can't figure out, by the...

Here is some help. Please read both parts attentively.


I assume you know the theory. I will show you the key strokes

For 1-Var statistics
Press [MODE][3:STAT] [1:1-VAR]. You are ready to enter values in the X column.
Enter a number and press [=]. Cursor jumps to second number to enter.
Keep entering numbers and pressing [=] till all numbers are in. Press the [=] key after the last one.
Press [AC] key to clear the screen.
Press [SHIFT] [STAT] (above digit 1.) then [5:Var]. Screen displays the statistical variables 1:n ;2: x bar; 3: x sigma n; 4:x sigma n-1.
Press the number corresponding to the statistical value you want, ex 1:n . The variable appears on screen. Press [=] and it will be displayed.
To display another variable press [SHIFT][STAT][5:Var][ 1,2, 3, or 4] .

To access the sum of squares sigma x^2 and the sum of data sigma x press[SHIFT][STAT][4:SUM] then [1: for sigma x^2] or [2: for sigma x]. Press [SHIFT][STAT][6:MinMax] to access minX and maxX.

For 2-var statistics
To perform 2 variable statistics you press [MODE][3:STAT] and any of the other regression options (except 1:1-Var). A two column template opens where you enter the X and Y values. When finished entering data, press [SHIFT][STAT][5:Var]. to access the different statistics. As I assumed above, you should be able to recognize what each variable means.


This post is rather exhaustive as regards the matrix capabilities of the calculator. So if the post recalls things you already know, please skip them. Matrix multiplication is at the end.

Let me explain how to create matrices. (If you know how to do it, skip to the operations on matrices, at the end.)

First you must set Matrix calculation
[MODE][6:Matrix]. Then By entering one of the numbers [1:MatA] or [2:Matb] or [3:MatC] you get to choose the dimensions of the matrix
(mxn]. Once finished entering the matrix you clear the screen.
The operations on matrices are available by pressing [Shift][Matrix]
[1:Dim] to change the dimension of a matrix (in fact redefining the matrix)
[2:Data] enter values in a matrix
[3:MatA] access Matrix A
[4:Matb] access Matrix B
[5:MatC] access matrix C
[6:MatAns] access the Answer Matrix (the last matrix calculated)
[7:det] Calculate the determinant of a matrix already defined
[8:Trn] The transpose of a matrix already defined

To add matrices MatA+MatB (MUST have identical dimensions same m and same n, m and n do not have to be the same)
To subtract MatA-MatB. (MUST have identical dimensions, see above)
To multiply MatAxMatB (See below for conditions on dimensions)
To raise a matrix to a power 2 [x2], cube [x3]
To obtain inverse of a SQUARE MatA already defined MatA[x-1]. The key [x-1] is the x to the power -1 key. If the determinant of a matrix is zero, the matrix is singular and its inverse does not exit.

Dimensions of matrices involved in operations must match. Here is a short summary

The multiplication of structured mathematical entities (vectors, complex numbers, matrices, etc.) is different from the multiplication of unstructured (scalar) mathematical entities (regular numbers). As you well know matrix multiplication is not commutative> This has to do with the dimensions.

An mXn matrix has m rows and n columns. To perform multiplication of an kXl matrix by an mXn matrix you multiply each element in one row of the first matrix by a specific element in a column of the second matrix. This imposes a condition, namely that the number of columns of the first matrix be equal to the number of rows of the second.
Thus, to be able to multiply a kXl matrix by am mXn matrix, the number of columns of the first (l) must be equal to the number of rows of the second (m).

So MatA(kXl) * MatB(mXn) is possible only if l=m
MatA(kX3) * Mat(3Xn) is possible and meaningful, but
Mat(kX3) * Mat(nX3) may not be possible.

To get back to your calculation, make sure that the number of columns of the first matrix is equal to the number of rows of the second. If this condition is not satisfied, the calculator returns a dimension error. The order of the matrices in the multiplication is, shall we say, vital.

Apr 14, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

How to multiply matrix on fx-991ES calculator?


Its very easy to do matrix operations in FX 991ES
This calculator can operate up to three Matrices at a time, namely Matrix A (Mat A), Matrix B (MAT B), Matrix C(MAT C).

  1. First to do, is set the calculator in MATRIX Mode
    Its Easy
    Press MODE button and press 6.
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  2. Now we need to Define matrices and set its dimensions.
    This product supports matrix of order up to 3x3. That is you can operate matrix of No. of rows=3 and No. of columns=3
    To input matrix, Press SHIFT and then 4. This will Pop up Menu for Matrix. Now press 1
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    Press 1 , 2 , or 3 to select Matrix A , B, or C.
    here I will Proceed with Matrix A, so I press Numerical 1 Key

  3. Next screen will ask you about the size of matrix.

    Press UP or DOWN Keys to view options.
    Press Corresponding Numerical keys to select corresponding order.

  4. On Next Screen , enter values on each positions
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  5. Now we inputed Details about Matrix A. If you want to specify other matrices (MATRIX B, MATRIX C) repeat STEPS 2 To STEP 4

  6. After Specifying required Matrices, we can tell calculator to do operations with them.

    Press SHIFT and then 4 and then It will show a menu contains

  7. For example, i need to multiply Matrix A with Matrix B, i'll enter as

    SHIFT + 4 + 3 to Input Matrix A

    to enter operator (Here multiplication, You enter + - x / for corresponding arithmetic operations )

    SHIFT + 4 + 4 to Input Matrix B

    = To show Result
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Hope this will help you.

have a good time with Casio FX 991ES

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1 Answer

I get ERR: DOMAIN everytime I try to inverse a matrix

  1. First, Press the "MATRX" button

  2. Next, enter a matrix into the calculator. To enter a matrix, press the arrow that points to the right two times when the cursor highlights letter "A." This moves the top cursor to "Edit." Press "Enter" to select the "Edit" option.

  3. Next,, enter the matrix's numbers into the matrix on the calculator. Press "Enter" to move the cursor over one column. Press a button that has a dash symbol within parenthesis [( - )] to move down one row. Repeat the steps until the matrix is completed.

  4. Next, Press "2nd" then "Mode" to go back to the home screen. Press "MATRX" to enter the matrix screen again.

  5. Finally, press "Enter" when the cursor highlights matrix "A" then press "[x^ -1]." Your screen should read "[A]^ -1." Press "Enter" again to display the inverse matrix.

    I got this information from

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You can use the display setup (Disp) screen to specify the symbols you want for the decimal point and 3-digit separator.
• To change the decimal point and separator symbol setting, press the MODE key a number of times until you reach the setup screen shown below.
Display the selection screen. (Disp) 1.
Press the number key ( 1 or 2) that corresponds to the setting you want to use.
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2(Comma): Comma decimal point, period separator

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Hanging symbol

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