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Create the matrix, specify its size, enter its elements, then use the Determinant command in the Matrix menu.

The matrix operations begin on page E-15 of the Additional Functions manual, and there's a fully worked out example on page E-17.

If you need the Additional Functions manual, you may download a copy here. The basic manual is here.

Posted on Feb 17, 2012

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Posted on Jan 02, 2017

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SOURCE: how to calculate inverse of a 3x3 matrix in casio

Hello,

Here is the solution for th FX-991ES.

Hello,

The error may be due to the key you used to signifie
inverse. It says in the manual that you should use the key x^-1 not the
one used to input general powers.

Here is screen capture from the
Appendix to the manual. The picture shows the sequence of keys to press
to obtain the inverse of a 2x2 matrix. It is taken from page 41 of
Appendix

The matrix used in the exemple is

a_11=2 a_12=1 a_21=1 a_22=2

Here is the link to download the manual and the appendix

http://support.casio.com/manualfile.php?rgn=1&cid=004001004

The link is for FX991ES. Look there foe you manual.

Hope it helps

Posted on Sep 07, 2009

SOURCE: can i calculate calculus using fx-991ms

If you want to get an answer like 1/2X for d/dx(X^2), you will have to
purchase a CAS calculator like Casio's Algebra FX-2 or Classpad. TI series calculators also have CAS.

However, you can calculate the numerical values of derivatives and integrals only.

To calculate the value of a proper integral:

- Press the 'ON' key;
- Press the Integral key ;
- Enter your expression (example X^2+X-3 etc);
- Press the 'comma' key after your expression;
- Input the first limit after comma, input comma again after first limit;
- Close brackets;
- Press the equals key, display may return after a while with the answer.

To calculate derivative at a point:

- Press Shift and then the integration key.
- Enter your function;
- Input comma;
- input the point at which you want to evaluate the derivative;
- Close bracket and press enter.

SHIFT+

Display looks like this: d/dx(X^2,3).

Posted on Oct 23, 2009

SOURCE: Hi, I have a Casio calculator fx-991MS giving me wrong answers!

Hello,

I am only looking for a plausible cause of the error, because I do not believe your calculator can make such a mistake. I think you **accidentally activated the Exponential display format** and did not pay attention to the small, raised -03 that came at the end of the number displayed. It is a common mistake for those not very familiar with Scientific or exponential notation.

Let us try to reset your calculator to the normal (floating point) format.

Press the [MODE] key a number of times until you reach a screen that has FIX, SCI, NORM and under each one a number (FIX 1, SCI 2), Norm 3). To have the number of decimal place you gave in your result (4 decimal digits), you press 1 to select Fix then 4.

Be aware that scientific calculators usually stop displaying results in floating point format ( 0.0000045 ) if the number is smaller then 0.001. So basically, 0.00099 will be displayed as 9.90-04, -04 being raised above the level, and in smaller size.

Hope it helps.

Posted on Oct 02, 2009

Testimonial: *"Thanks so much, its working now:) I thought I was going to have to buy a new calculator!"*

SOURCE: how to calculate 0.3log(base 2)0.3 using fx-991ms

Your calculator knows only the decimal logarithms log or log_10 and the natural logarithms (ln or log in base e).

So you cannot compute directly the logarithms in any bases other than 10 and e.

A workaround consists in using the relation

log in base b of a number a (log_b (a))

log_b(a)= (log_10(a) ) / (log_10 (b))

or the relation

log_b(a)= ln(a)/ln(b)

log_2(0.3)=log(0.3)/log(2) where log is log in base 10

Similarly

log_2(0.3)=ln(0.3)/ln(2)

As to the multiplicative factor you had at the beginning of your expression, just multiply the value obtained by one on the formulas above (both formulas will give the same result) by 0.3

Posted on Jul 24, 2010

Casiodisplay format (Disp) settings while the calculator is in the BASE ... Be sure to checkthe current calculation mode (SD, REG,. COMP ... Use [ and ] to display the expression 4 + 4. Press A ... want to perform scientific function calculations. COMP .

Dec 03, 2015 | Casio Office Equipment & Supplies

Read user's manual. Don't have one? Download it from here:

http://support.casio.com/storage/es/manual/pdf/ES/004/fx100MS_115MS_570MS_991MS_ES.pdf

http://ftp.casio.co.jp/pub/world_manual/edu/en/fx115MS_991MS_E.pdf

http://ftp.casio.co.jp/pub/world_manual/edu/es/fx115MS_991MS_S.pdf

Tutorial para calculadora CASIO fx 991MS

http://support.casio.com/storage/es/manual/pdf/ES/004/fx100MS_115MS_570MS_991MS_ES.pdf

http://ftp.casio.co.jp/pub/world_manual/edu/en/fx115MS_991MS_E.pdf

http://ftp.casio.co.jp/pub/world_manual/edu/es/fx115MS_991MS_S.pdf

Tutorial para calculadora CASIO fx 991MS

Sep 12, 2015 | Casio Office Equipment & Supplies

On a fx-991MS? With many other models, including the fx-991ES, I'd say you have the calculator in binary mode but the 991MS doesn't have such a mode.

Aug 03, 2013 | Office Equipment & Supplies

Do you mean the fx-991ES?http://upload.wikimedia.org/wikipedia/commons/8/8f/Casio_fx-991ES_Calculator_New.jpg

Or do you mean the fx-991MS?http://nayuki.eigenstate.org/res/casio-fx-991ms-tips-and-tricks/casio-fx-991ms-l33tness.jpg

Or do you mean the fx-991MS?http://nayuki.eigenstate.org/res/casio-fx-991ms-tips-and-tricks/casio-fx-991ms-l33tness.jpg

Jul 25, 2013 | Cameras

Your calculator knows only the decimal logarithms log or log_10 and the natural logarithms (ln or log in base e).

So you cannot compute directly the logarithms in any bases other than 10 and e.

A workaround consists in using the relation

log in base b of a number a (log_b (a))

log_b(a)= (log_10(a) ) / (log_10 (b))

or the relation

log_b(a)= ln(a)/ln(b)

log_2(0.3)=log(0.3)/log(2) where log is log in base 10

Similarly

log_2(0.3)=ln(0.3)/ln(2)

As to the multiplicative factor you had at the beginning of your expression, just multiply the value obtained by one on the formulas above (both formulas will give the same result) by 0.3

So you cannot compute directly the logarithms in any bases other than 10 and e.

A workaround consists in using the relation

log in base b of a number a (log_b (a))

log_b(a)= (log_10(a) ) / (log_10 (b))

or the relation

log_b(a)= ln(a)/ln(b)

log_2(0.3)=log(0.3)/log(2) where log is log in base 10

Similarly

log_2(0.3)=ln(0.3)/ln(2)

As to the multiplicative factor you had at the beginning of your expression, just multiply the value obtained by one on the formulas above (both formulas will give the same result) by 0.3

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

how to solve probability in fx-991ms

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

I don't know about fx-9750gII, but for fx-991MS

Change the mode to REG

Then

Shift->3(DISTR)->1(P())->give your Z value

Change the mode to REG

Then

Shift->3(DISTR)->1(P())->give your Z value

Jan 07, 2010 | Casio Office Equipment & Supplies

Hello,

If by calculus problem you mean derivatives of functions, integrals, extrema and such things, I am sorry to inform you that neither the Casio FX-300MS, nor the FX-991MS can handle them. The newer Casio calculator FX-991ES is capable of performing numerical differentiations and integrations. There also graphing calculators by Casio FX-9750G, FX-9860G as well as by Texas Instruments (TI 83 PLUS/TI84PLUS) that are reasonably performant in that area.

Hope it helps.

If by calculus problem you mean derivatives of functions, integrals, extrema and such things, I am sorry to inform you that neither the Casio FX-300MS, nor the FX-991MS can handle them. The newer Casio calculator FX-991ES is capable of performing numerical differentiations and integrations. There also graphing calculators by Casio FX-9750G, FX-9860G as well as by Texas Instruments (TI 83 PLUS/TI84PLUS) that are reasonably performant in that area.

Hope it helps.

Oct 19, 2009 | Casio FX-300MS Calculator

there is one button ab/c beneath CALC... if u want to calculate 7 mod 4 then... u should press 7 then ab/c 4 and equal to

1, 3 ,4 which is 4*1=4 and 7-4=3 remainder...

1, 3 ,4 which is 4*1=4 and 7-4=3 remainder...

Jun 29, 2009 | Casio FX-115MS Plus Calculator

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