HP integral



#2

I got an HP 50G for Christmas (yay) and it is really handy, especially because I like the reverse notation.
I would like to be able to do definite integrals on it for calcII and I can't figure out how (without switching notations).
Anybody want to tell me button for button what to hit?
That'd be great
Thanks :D


#3

Define the precision you want (eg. FIX 4, SCI 9, and so forth), through the MODE key. Be sure to be in the Approx mode (MODE CAS menu)

Type the lower limit (a number)

Type the upper limit (a number)

Type the equation (either through the EQW editor or as an algebraic equation enclosed in single quotes)

Type the integration variable (usually X), enclosed in single quotes. If you hit the X key and then ENTER, you're done (unless X is a variable, in which case it returns its value; in this case, use explicit single quotes).

Type the integral command (on my HP-49g+ it's on the TAN key, to be hit after the red right shift).

Wait for the answer.

In the VAR menu (hit the proper key), you see the IERR variable, that yields the error of the calculation.

Hope this will help.

-- Antonio


Edited: 24 Jan 2007, 4:59 a.m. after one or more responses were posted


#4

Wow.
You're awesome-
Thanks !


#5

Just as a general learning principle, be sure before even approaching the calculator to know a little bit about the properties of the function in question. Some functions with kinks and bends and what have you are notoriously difficult to integrate numerically. Likewise with functions with lots of oscillations that increase as you approach one of the limits of integration. Sometimes a clever variable substitution or transformation makes a difficult problem a lot easier.

A classic example is the Kahan integral, sqrt(x)/(x-1) - 1/ln(x) integrated between x = 0 and x = 1. This function has a dramatic kink in it close to x = 0. Substituting x = w^2, dx = 2w dw, and integrating from w = 0 to w = 1 makes the curve smoother and more tractable for the calculator's algorithm.

Les

#6

Another way to enter a definite integral is to use the equation editor. Right Shift EQW, then Right Shift Integral. You can fill in the blanks using the right/left arrows to navigate the form. Good luck with your class,

Dave


Possibly Related Threads...
Thread Author Replies Views Last Post
  Integral Richard Berler 32 2,261 09-22-2013, 08:59 PM
Last Post: Les Koller
  Another tough integral Gerson W. Barbosa 59 2,644 05-20-2012, 05:59 PM
Last Post: Gerson W. Barbosa
  can't calculate integral on hp 41 Hans Holzach 12 957 05-16-2012, 02:59 PM
Last Post: Hans Holzach
  Polynomial Derivative and Integral for the HP 35S Eddie W. Shore 0 226 05-24-2011, 10:29 PM
Last Post: Eddie W. Shore
  Indefinite integral calculation with 49g+/ 50g ferroburak 7 616 11-10-2009, 02:27 PM
Last Post: David Hayden
  Solving for an Integral: 28S solution Marcus von Cube, Germany 2 326 03-02-2008, 10:49 AM
Last Post: Marcus von Cube, Germany
  Handheld Calculator Helps Solving Kahan's Integral Symbolically Gerson W. Barbosa 3 332 02-26-2007, 11:28 AM
Last Post: Gerson W. Barbosa
  Kahan's "weird" integral revisited Les Wright 1 270 01-02-2007, 01:29 PM
Last Post: Namir
  OT: Integral PC Backup? Howard Owen 2 323 04-19-2006, 08:15 AM
Last Post: Vassilis Prevelakis
  OT: Integral PC Floppy Drive Howard Owen 10 701 03-13-2006, 01:58 PM
Last Post: Dave Shaffer

Forum Jump: