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Calculating the derivative with a TI calculator

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NovaLFS Posted messages 2 Status Member -  
koraud Posted messages 1 Status Member -
Hello,

I have a TI-83 Plus calculator. I would like to know how to find the derivative of a function, without specifying values for an interval, but simply the derivative of the function. For example, if I ask it what the derivative of x squared is, the calculator tells me it's 2 times x, and not a number.

Also, I would like to know how to find the minimum of a function, without defining intervals. 
Configuration: Windows XP Internet Explorer 7.0

6 answers

  1.
    fab7777 Posted messages 1081 Status Member 91
     
    In the function Y=
    you do "Math" --> 8: nDeriv (and then you put the function, X, X)
    19
    1. milka96
       
      What is x in parentheses?
      0
    2. koraud Posted messages 1 Status Member
       
      The derived number is NOT the derivative.
      This program will trace the curve of the derivative (at 1/10th of a pixel with a scale of 0.1), but despite 3 months of research, there's no way to provide the expression
      Instructions:
      adjust the window
      launch the program
      choose the scale (precision) e.g. scale of 0.1 on -1/1: 20 calculated points.

      prompt S, P, M (the famous scale, the lower limit, the upper limit)
      For (I, P, M, S (execution between P and M, all S)
      (y1(I+0.001)-y1(I))/0.001->A (for an unknown reason, nbrdérivé did not work - Aff(I,A) did not. By increasing the number of 0, we increase the End precision)
      0