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Ti-83 giving me wrong answer when i use the nDeriv() function

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: derivative

put a second parenthesis in front of 3X

Posted on May 19, 2008

  • 6 Answers

SOURCE: on my TI 83 plus my sine cosine and tangent

Alot of people seem to be having this problem. Angles can be measured in two units, degrees and radians. Your calculator is currently doing everything in terms of radians. I have an 84 but I'm sure the 83 is similar, go under MODE and look for Degrees and Radians and make sure you choose degrees. if you have to convert, 360[degrees] = 2* pi [radians]
(easy to remember, 360deg in a circle, 2pi radians in a circle)
Good luck

Posted on Aug 12, 2009

  • 7993 Answers

SOURCE: TI-83 Plus will not let me view a table

Hello,
I have just done what you said you had done, but I got a nice, correct table of values. You might have discoverd a secret command to clear memory.

Cheers.

Posted on Sep 09, 2009

  • 7993 Answers

SOURCE: When I put X^(1/3) into Y=, and go to nDeriv, and

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.
b308767.jpg
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.

Posted on Nov 10, 2009

  • 61 Answers

SOURCE: my TI-83 calculator is giving

Try reseting your calculator if needed, and sometimes answers can be off because the calculator sometimes is so precise you answers may be rounded.

Posted on Mar 10, 2011

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1 Answer

TI-83 Plus ( finding linear regression) gives wrong y-intercept (b=) value sometimes. Please tell me why?


I get the same answer. Is b wrong? When I do it in Excel I get b= -2E+06, which is -1 797 322.99 rounded to the millions, in scientific notation.

Let me know if you have any questions.

Good luck,

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My ti-83 plus is giving me the wrong answer only when i divide.


I am sorry, there is nothing to fix. The answer is perfectly correct. 62250/1450=439310344828
I think you meant to divide 65250 by 1450, the result of which is 45.

Jun 29, 2012 | Texas Instruments TI-83 Plus Calculator

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My TI-83 plus seems to give me the wrong answer if I type in the problem: 1400/(60*24) The answer should be 1, but I keep getting .9722222. I don't understand why it keeps giving me the wrong...


That is the correct answer. 60 multiplied by 24 is 1440. 1400 divided by 1440 is a number slightly smaller than 1.

Are you sure the problem isn't 1440/(60*24)?

Jun 22, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

Zoom function on tI-83 plus


The calculator is not designed to quit on you without giving a fair warning: an error message. There are several Zoom functions, each with its specificities, so saying that the zoom function quit on you does not help a bit.
The safest Zoom you can use without any prior knowledge of the function is the ZoomStd (Zoom standard). It sets Xmin=-10, Xmax=10, Ymin=-10, Ymax=10. That is also what you get if you reset the memory.

You did not explicitly ask a question. Nonetheless I tried to answer with blinders on my eyes. If you still want to understand what you have been doig wrong with the Zoom, post a comment to this thread spelling out what you have been trying to do and the error message you got.

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1 Answer

I ask my TI-83 Plus to calculate (-64)^(3/2) The TI-83 Plus says the answer is -512i, but I think the answer should be 512i. Is the calculator wrong or am I?


You're both right, in a way. (-64)^3 is -262144. The square root of that is +/- 512i. Take your choice as to the sign.

For what it's worth, the TI-84, TI-86, TI-89, and the HP 50g all go with the negative value.

Jan 24, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

How do enter a lim of function when from one side using nderiv


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.

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

3 Answers

Derivative


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!

Apr 10, 2008 | Texas Instruments TI-84 Plus Calculator

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