Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Read paper titled "What every programmer should know about floating point" (google for it). Then you'll see that most of the floating values are represented approximately in computer hardware.</p> <p>To make calculations without this drawback, use symbolic calculation. But this is not as efficient as using floating point.</p> <p>To make floating point results consistent, use rounding to nearest power of 10, e.g., 0.1, 0.01, etc. To understand when you should stop apporximations, use some kind of threshold to watch for during approximation steps. E.g., if performing next approximation step yields only .001% change to already computed value, there's no sense to continue approximations.</p> <p><strong>Update</strong> I had my numerical computation classes long ago, but I can vaguely recall that substracting close numbers is very bad, because if numbers are very close, most reliable digits are cancelled out and you have unreliable digits. This is exactly what happens when you decreasing <code>h</code>. What is suggested in these situations is substitute substraction with some other operations. For example, you can switch to some kind of series to which your `f(x) expands.</p> <p>I don't quite understand your 2nd question, because answer depends on your requirements -- "as many as you wish".</p> <p>By the way, you might have better luck with finding answers to your questions at math.stackexchange.com.</p> <p>Additionally, visit link provided by <code>thrashgod</code>: <a href="http://en.wikipedia.org/wiki/Numerical_differentiation#Practical_considerations_using_floating_point_arithmetic" rel="nofollow">Numerical differentiation</a></p>
    singulars
    1. This table or related slice is empty.
    1. POJava estimate a derivative at a point
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USVictor Sorokin
    1. USVictor Sorokin
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI know all of this already. My question is what is the most appropriate h, and how can it be scaled to any size
      singulars
      1. PO
      1. USThe Dude
    2. CO@The Dude I updated answer.
      singulars
      1. PO
      1. USVictor Sorokin
    3. COah thank you, i did not know about math.stackexchange.com.
      singulars
      1. PO
      1. USThe Dude
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload