Question about Texas Instruments TI-84 Plus Calculator

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Posted on Jan 02, 2017

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SOURCE: rref for 4X4 matrix does not answer correctly

To make sure that the calculator is misbehaving, I suggest that you create a simple 4X4 matrix, that is not singular, and calculate it reduced row echelon form by hand, then use the calculator to perform the reduction. You can also generate a random 4x4 matrix and calculate the rref forms by hand and with the calculator. If the calculator is defective, try to upgrade the OS. If it is still defective, well, the deck is stacked aaginst you. It may then be time to get another one or to send it for repairs.

Posted on Jan 21, 2012

press on the green telephone icon and slide it sideways

just like you are scrolling the screen

just like you are scrolling the screen

Dec 17, 2016 | Cell Phones

what you need to do is open up your device manager, you then need to click the action tab at the top and click add legacy hardware

then click next and next again it will then scan and find nothing click next on the screen after that.

Wait a minute and you will see a list of hardware appear, scroll down and choose network adapters then click next, then from the left column choose Microsoft then in the right hand column scroll down and choose Microsoft Teredo Tunneling Adapter, then click next and this will install it.

To check just make sure it is set to show hidden devices, right click on device manager on the right and click view then show hidden devices

then click next and next again it will then scan and find nothing click next on the screen after that.

Wait a minute and you will see a list of hardware appear, scroll down and choose network adapters then click next, then from the left column choose Microsoft then in the right hand column scroll down and choose Microsoft Teredo Tunneling Adapter, then click next and this will install it.

To check just make sure it is set to show hidden devices, right click on device manager on the right and click view then show hidden devices

May 14, 2014 | Computers & Internet

To make sure that the calculator is misbehaving, I suggest that you create a simple 4X4 matrix, that is not singular, and calculate it reduced row echelon form by hand, then use the calculator to perform the reduction. You can also generate a random 4x4 matrix and calculate the rref forms by hand and with the calculator. If the calculator is defective, try to upgrade the OS. If it is still defective, well, the deck is stacked aaginst you. It may then be time to get another one or to send it for repairs.

Jan 18, 2012 | Texas Instruments Office Equipment &...

you can contact the mobile service provider.......

Aug 24, 2011 | HTC Snap S522 Cell Phone

Well, the equation is Ax=b and we want so solve for x

There are several ways of entering the data, but this is one way

Code: A=[15+35i 29+1i; 46+13i 62+3i]

b=[0;0]

x=A\b which has the trivial solution x=[0;0] (the ";" means "next row", a space next column.) To input a matrix use APPs then Data/Matrix Editor then New. Then change Data to Matrix. Put in the name such as "AA" in the variable field. Then enter row and column dimensions. Then edit as a spread sheet. Use F6(util) to delete a column or row. To manipulate matrices, exit the matrix application, then go to MATH then Matrix. Notice that J(RowOpps) is available. Good luck and thank you for using FixYa! We would sure appreciate a 4 "thumbs-up" rating for this answer. Happy holidays!

There are several ways of entering the data, but this is one way

Code: A=[15+35i 29+1i; 46+13i 62+3i]

b=[0;0]

x=A\b which has the trivial solution x=[0;0] (the ";" means "next row", a space next column.) To input a matrix use APPs then Data/Matrix Editor then New. Then change Data to Matrix. Put in the name such as "AA" in the variable field. Then enter row and column dimensions. Then edit as a spread sheet. Use F6(util) to delete a column or row. To manipulate matrices, exit the matrix application, then go to MATH then Matrix. Notice that J(RowOpps) is available. Good luck and thank you for using FixYa! We would sure appreciate a 4 "thumbs-up" rating for this answer. Happy holidays!

Dec 05, 2010 | Texas Instruments TI-84 Plus Calculator

Right click on an empty spot on the desktop, scroll down to the graphics control panel, this may be Ati or Nvidia. Open the control panel amd look to the choices on the left. There will be a choice to either "Rotate Display" or something about "Screen Orientation", change the rotation to "0" degrees or whatever puts it upright.

Jan 02, 2010 | HP Computers & Internet

I assume you are speaking of solving a system of equations with a number of unknowns. If not, please correct me. Here's an example in practice:

If you have a system of 3 equations with 3 unknowns, you would set up your matrix so that the coefficients of each variable for a particular equation are on one row. So, given equations x + y + z = 0, 2x + 3y - 4z = 1, x + -z = -1 you would type the following into your calculator: [[1,1,1,0][2,3,-4,1][1,0,-1,-1]] and press enter to make sure you typed it correctly. notice that in the third row there is a zero, since we have zero time y for the third equation. Then row-reduce the matrix (2nd > 5 > 4 > 4 or in the CATALOG as rref). You should get out the matrix [[1,0,0,-1][0,1,0,1][0,0,1,0]]. This says that x=-1 y = 1 z=0 since my first column contained the coefficients for the x variable, the second for the y variable, and the third for the z variable. The last column contains the solution, the part on the other side of the equals sign.

Hope this helps! For more reading (from someone else; I just made this one up), check out the Wikipedia articles on Gaussian elimination and Systems of linear equations

If you have a system of 3 equations with 3 unknowns, you would set up your matrix so that the coefficients of each variable for a particular equation are on one row. So, given equations x + y + z = 0, 2x + 3y - 4z = 1, x + -z = -1 you would type the following into your calculator: [[1,1,1,0][2,3,-4,1][1,0,-1,-1]] and press enter to make sure you typed it correctly. notice that in the third row there is a zero, since we have zero time y for the third equation. Then row-reduce the matrix (2nd > 5 > 4 > 4 or in the CATALOG as rref). You should get out the matrix [[1,0,0,-1][0,1,0,1][0,0,1,0]]. This says that x=-1 y = 1 z=0 since my first column contained the coefficients for the x variable, the second for the y variable, and the third for the z variable. The last column contains the solution, the part on the other side of the equals sign.

Hope this helps! For more reading (from someone else; I just made this one up), check out the Wikipedia articles on Gaussian elimination and Systems of linear equations

May 03, 2009 | Texas Instruments TI-84 Plus Calculator

i tried to graph a simple function but it wont show the lines it will only show the graph

Mar 17, 2009 | Casio FX-9750GPlus Calculator

Go to your matrix button and enter a "3x4" matrix.

Then enter it as follows:

-3 4 5 7

4 3 2 9

-5 5 3 -10

Then exit out and go to "2nd->matrix->math->rref(". Then press enter.

Your screen should look like this:

rref(

Then go to matrix and select your 3x4 matrix, press enter and close it with a parathesis. Your screen should look like this:

rref([A])

Press enter and the screen should say this:

1 0 0 2

0 1 0 -3

0 0 1 5

So,

x=3

y=-3

z=5

Hope this cleared up the confusion!

SJ_Sharks

Then enter it as follows:

-3 4 5 7

4 3 2 9

-5 5 3 -10

Then exit out and go to "2nd->matrix->math->rref(". Then press enter.

Your screen should look like this:

rref(

Then go to matrix and select your 3x4 matrix, press enter and close it with a parathesis. Your screen should look like this:

rref([A])

Press enter and the screen should say this:

1 0 0 2

0 1 0 -3

0 0 1 5

So,

x=3

y=-3

z=5

Hope this cleared up the confusion!

SJ_Sharks

Mar 03, 2009 | Texas Instruments TI-84 Plus Calculator

When SCROLL LOCK is on, "SCRL" appears on the Excel status bar. If you press the arrow keys when SCROLL LOCK is on, you scroll one row up or one row down. Or, you scroll one column to the left or one column to the right. To use the arrow keys to move between cells, you must turn SCROLL LOCK off.

Sep 18, 2008 | Microsoft Office Professional 2007 Full...

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