how to calculate inverse of a 3x3 matrix in casio fx-991MS calculator?
Posted by tweety... on
Here is the solution for th FX-991ES.
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
The link is for FX991ES. Look there foe you manual.
Hope it helps
Posted on Sep 07, 2009
How do you use the pol and rec
Posted by william196... on
To avoid errors make sure that the angle unit is THE ONE
required by your problem. To verify or to change the angle unit press
[SIFT][MODE] and select [3: Deg] for degrees, [4:Rad] for radians, or
[5:Grad] for grads.
Convert from rectangular to polar
[SHIFT][+] (Pol) . Screen displays Pol(
You enter the X-coordinate, and the Y coordinate separated by a comma, then you close the parenthesis and press [=].
Exemple: Polar coordinate of the point (1,1)
Pol( 1, 1) gives
r=1.414213562 (square root of 2)
Here is how you enter it
[SHIFT][POL] 1 [SHIF] [,] 1 [)] [=]
The screen displays
Convert from polar to rectangular coordinates
Rec ( radius, angle) =
Exemple: Recatngular coordinates of (r=3, θ=60°)
[SHIFT][Rec] 3 [SHIFT][,] 60 [ ) ] [=]
The screen displays
Posted on Jan 20, 2010
how to interpolate in CASIO fx 991 ES
Posted by vivekratna... on
l x l y l
l 2 l 4.6 l
l 4 l 5.9 l
u will get ans
Posted on Nov 07, 2012
how to write log base 2 in casio fx-82MS
Posted by juliettica on
With log a / log b = loga (b) formula
In casio for log2 8 = log8 / log 2 = 3
Posted on May 19, 2010
how to get the inverse of a matrix an fx-991 ES calculator
Posted by ahmed... on
The same way you would get the inverse of a number. Assuming you already have the matrix entered into memory, press SHIFT 4 to bring up the matrix menu, select the matrix whose inverse you want, then press the x^-1 key (just to the right and slightly below the big round cursor pad.
Posted on Nov 02, 2010
How do you reset the casio fx-115es
Posted by foxx_eee on
Next to the digit 9 key or ( there is a marking on the calculator that says CLR. To clear calculator (reset) press [SHIFT] (CLR) [=]. You will have to confirm the resetting.
Posted on Sep 06, 2010
How to convert polar to rectangular form
Posted by rah_bhati on
Press [MODE] and select [1:COMP]
Press [SHIFT][MODE] and select [3:Deg]. You can also use rad if the angle you are given is in radians.
To start the conversion
Press [SHIFT][-] (Rec) screen displays Rec(
Key in the radius r , ex: 3 screen displays Rec(3
Press [SHIFT][)] (,) to enter comma separator Rec(3,
Key in the angle in degrees, ex: 57.3; screen displays Rec(3,57.3
Press ) to close parentheses; screen displays Rec(3, 57.3)
X and Y are the values of the coordinates.
If angle is in radians, [SHIFT] [MODE][4:Rad] the command
Rec(3, Pi) gives X=-3, Y=0
Hope it helps
Posted on Oct 18, 2009
how to calculate 0.3log(base 2)0.3 using fx-991ms calc
Posted by amaresh... on
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_2(0.3)=log(0.3)/log(2) where log is log in base 10
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
how to interpolate with 991MS
Posted by december... on
i am giving the key input with an example..
at 0, value is 300
at 50, value is 270
so how much at 30...
Go in Reg mode, for doing that : press Menu,Menu, 2
Enter the values as follows,
0,300 and press M+ key on the calci
(Note: there is a "," in between 0 and 300)
then enter the following,
50,270 and press M+ key
now enter the following input exactly as displayed below:
(30) shift 2 > > > 2 =
you will get the answer as 282.
I hope you got it!!!
Posted on Mar 02, 2011
How to turn off scientific notation on CASIO fx-115ES?
Posted by tahsk2008 on
Press [SHIFT][MODE][6:Fix] (number between 0 an 9) to select the number of decimal digits you want. Then press [=].
Hope it helps.
Posted on Oct 09, 2009
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