Can't get integration right
05-31-2016, 12:16 PM (This post was last modified: 06-01-2016 04:23 PM by Marcio.)
Post: #1
 Marcio Senior Member Posts: 438 Joined: Feb 2015
Can't get integration right
Hello all,

Would you be king enough as to point out what I am doing wrong with this very simple integration?

$t = \int_0^{0.515}\frac{1}{0.000273\times exp\left[16306\times\left(\frac{1}{535}-\frac{1}{535+90.45x}\right)\right](1-x)} dx$

The correct answer is $$833$$ but I keep getting $$838.867\pm2.38E-7$$ with FIX 9.

This is the code I am using on the 15C:

R0 = 0.000273
R1 = 16306
R2 = 535
R3 = 90.45

Code:
LBL 0 RCL 3 x RCL 2 + CHS 1/X RCL 2 1/X + RCL 1 x exp RCL 0 x x<>y CHS 1 + x 1/X RTN

Very much appreciated.
05-31-2016, 12:36 PM
Post: #2
 Werner Senior Member Posts: 747 Joined: Dec 2013
RE: Can't get integration right
You're not doing anything wrong, as that is the correct answer for the problem as stated.
Perhaps a digit is wrong somewhere in the constants?

Werner
05-31-2016, 01:39 PM (This post was last modified: 05-31-2016 01:46 PM by Marcio.)
Post: #3
 Marcio Senior Member Posts: 438 Joined: Feb 2015
RE: Can't get integration right
That is right. Just found out 833 was a "close" approximation and 838.87 is actually the correct answer.
Thank you.
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