Question about Texas Instruments TI-84 Plus Calculator

Put a second parenthesis in front of 3X

Posted on May 19, 2008

Press the MATH button, and under the first subheading (math), choose #8, which is nDeriv.

The syntax for it is: nDeriv(function, variable, number)

So if you want the derivative of x^2 at x = 1, then you enter:

nDeriv(x^2, x, 1)

However, I don't know of any way a TI-84 Plus can calculate the algebraeic derivative. Hopefully the other way helped!

Posted on May 07, 2008

Please help me to find the answer for my problem with TI-84:

If I'd like to work with: **nDeriv(3X^3+2x^.5),X,1) **

then I press Enter button, the sreen shows Error...

Please help me to get the answer for this problem. Thank you very much!

Posted on Apr 17, 2008

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Posted on Jan 02, 2017

There is a command called nDeriv( which you find in the catalog. To open the catalog of commands press [SHIFT][0] (CATALOG), then scroll down or press N to jump to the 1st command starting with N.

Highlight the command then press ENTER. The command echoes on the main screen. Type in the function you want to differentiate, type in a comma to separate, type the name of the vatriable (X), then type in the value at which the derivative is to be evaluated. Close the right parenthesis, then press ENTER.

This is what you see with the newer OS that has MathPrint

With the newer OS with MODE set to Classic, here is what you see.

Hope it helps.

Highlight the command then press ENTER. The command echoes on the main screen. Type in the function you want to differentiate, type in a comma to separate, type the name of the vatriable (X), then type in the value at which the derivative is to be evaluated. Close the right parenthesis, then press ENTER.

This is what you see with the newer OS that has MathPrint

With the newer OS with MODE set to Classic, here is what you see.

Hope it helps.

Dec 08, 2011 | Texas Instruments TI-84 Plus Silver...

The TI-84 does not have a Computer Algebra System and therefore cannot perform this operation.

It can however find the value of a derivative at a single point on a function. Put the function into your Y= menu and graph it. Press 2nd and Trace to go to the calc menu and choose the "dy/dx" option. Type the x-value at which you want to evaluate the derivative and press enter.

It can however find the value of a derivative at a single point on a function. Put the function into your Y= menu and graph it. Press 2nd and Trace to go to the calc menu and choose the "dy/dx" option. Type the x-value at which you want to evaluate the derivative and press enter.

Dec 15, 2010 | Texas Instruments TI-84 Plus Calculator

The newer version of the OS 2.0.0.1188 is quite different from the initial version. It would be a good idea to upgrade the OS.

Back to your question. Since I upgraded my calculator, I am unable to illustrate the calculations with screen captures that are meaningful to you. If you do not mind I will show you how to calculate derivatives and integrals using OS Version 2.0.0.1188

In Calculator Mode

For the numerical integration

Select Calculus (see above)>Numerical Integration>ENTER.

Type in your integral using the template. Here is the procedure illustrated.

Back to your question. Since I upgraded my calculator, I am unable to illustrate the calculations with screen captures that are meaningful to you. If you do not mind I will show you how to calculate derivatives and integrals using OS Version 2.0.0.1188

In Calculator Mode

- Press the Menu button.
- Use down arrow to highlight 4:Calculus or just press 4
- Select 1:Numerical derivative at a point and press ENTER
- An entry screen opens where you can select the name of the independent variable (default is x, not X), the point where you want the derivative and whether you calculate the first or the second derivative.
- After you make your choices, you press ENTER and a template is displayed in calculator screen.
- All you have to do then is to specify the function you are differentiating.

For the numerical integration

Select Calculus (see above)>Numerical Integration>ENTER.

Type in your integral using the template. Here is the procedure illustrated.

May 28, 2010 | Texas Instruments TI-Nspire Graphic...

Hi,

You cannot use the ± in the definition of a function. If you need to consider two alternatives, you have draw each function separately, one function as Y1 and the other as Y2. I just checked the catalog of commands, and there is no ±.

Hope it helps.

Thanks for using FixYa

You cannot use the ± in the definition of a function. If you need to consider two alternatives, you have draw each function separately, one function as Y1 and the other as Y2. I just checked the catalog of commands, and there is no ±.

Hope it helps.

Thanks for using FixYa

Nov 19, 2009 | Texas Instruments TI-84 Plus Calculator

Hello,

The derivative of the cubic root of x is, as you wll know, equal to (1/3)*x^(-2/3). Its limit as x approaches 0 is undefined. However the calculator uses approximate representations of numbers to calculate. And you can never be sure what it is going to give as results near singularities (poles of functions).

Calculators with Computer Algebra Systems can do better. To show you this, I am enclosing a screen capture showing you the correct result.

On this screen I defined a function u =f(v) where u is the derivative of cubic root of v. I stored 0 in the dummy variable v, and I evaluated the function u at v=0. You can see that the result displayed is undefined.

That this result is deemed correct seems to me just a matter of convention. We do not know, we cannot know, or we dont care to know? It will not make any of us lose sleep.

Hope it helps.

The derivative of the cubic root of x is, as you wll know, equal to (1/3)*x^(-2/3). Its limit as x approaches 0 is undefined. However the calculator uses approximate representations of numbers to calculate. And you can never be sure what it is going to give as results near singularities (poles of functions).

Calculators with Computer Algebra Systems can do better. To show you this, I am enclosing a screen capture showing you the correct result.

On this screen I defined a function u =f(v) where u is the derivative of cubic root of v. I stored 0 in the dummy variable v, and I evaluated the function u at v=0. You can see that the result displayed is undefined.

That this result is deemed correct seems to me just a matter of convention. We do not know, we cannot know, or we dont care to know? It will not make any of us lose sleep.

Hope it helps.

Nov 10, 2009 | Texas Instruments TI-84 Plus Silver...

Hello,

I am sorry to disappoint you, the nDeriv ( function can only calculate numerical derivatives of an expression at a point. The dy/dx can do the same thing (calculate the first derivative) at one point on a displayed graph. It can be activated for graphs by pressing TRACE, then [2nd][CALC][6:dy/dx]. If you need the derivative at more than one point you have to press [2nd][CAL] [6:dy/dx] again.

What I said above concerns the native abilities of the calculator. There may be applications you can install to allow computation of 2nd derivatives. look for them on the TI site, or the archive section of ticalc.org. Try deriv

Hope it helps.

I am sorry to disappoint you, the nDeriv ( function can only calculate numerical derivatives of an expression at a point. The dy/dx can do the same thing (calculate the first derivative) at one point on a displayed graph. It can be activated for graphs by pressing TRACE, then [2nd][CALC][6:dy/dx]. If you need the derivative at more than one point you have to press [2nd][CAL] [6:dy/dx] again.

What I said above concerns the native abilities of the calculator. There may be applications you can install to allow computation of 2nd derivatives. look for them on the TI site, or the archive section of ticalc.org. Try deriv

Hope it helps.

Nov 05, 2009 | Texas Instruments TI-84 Plus Calculator

Hello,

nDeriv( is valid only for real variables.

The syntax is as follows:

**nDeriv ( expression, variable, value, epsilon**)

**expression**: the function the derivative of which you want to calculate

**variable**: the name of the variable in the expression above (usually x)

**value:** the numerical value of the e x where you evaluate the derivative

**epsilon**: the numerical value of the tolerance. Default is 1x10^(-3). But you can change it to a smaller value to obtain a more precise result.

To use default value of epsilon

**nDeriv ( expression, variable, value**)

To use a different epsilon, ex 1x10^(-4)

**nDeriv ( expression, variable, value, 0.0001**)

nDeriv( A^3 , A, 5., 0.0001) should give you 75

Hope it helps.

nDeriv( is valid only for real variables.

The syntax is as follows:

To use default value of epsilon

To use a different epsilon, ex 1x10^(-4)

nDeriv( A^3 , A, 5., 0.0001) should give you 75

Hope it helps.

Oct 21, 2009 | Texas Instruments TI-84 Plus Calculator

Press the 2nd button, then the plus button, the 7, then 1, then 2. This will reset your calculator.

Jun 01, 2009 | Texas Instruments TI-84 Plus Calculator

nderiv(nderiv(sin(x),x,x),x,2)

Dec 03, 2008 | Texas Instruments TI-84 Plus Silver...

well, the TI-84 does not do derivatives, however, the TI-89 does, if you are willing to fork over the $150 for it. It is definitely worth it if you are planning on taking Calculus BC and/or SAT II for Math Level 2.

Apr 07, 2008 | Texas Instruments TI-84 Plus Calculator

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I used "nDeriv" last week and it worked very well. However, this week our teacher told us to type "NewProb" and now nDeriv isn't working anymore.

How can I fix this problem, so I can use it again? Thanks

I used nDeriv last week and it worked very well. However, today our teacher told us to type in 'NewProb' and now nDeriv isn't working anymore. How can I solve this problem and use nDeriv again? Thanks

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