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## Excel Math Bug

## Mathematical Functions In Excel 2007

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Now when you take a **look at the pivot** table that uses this data, you can see the error in the pivot table. compliance and reporting Latest Stories AUDITING All articles Compilation and review Peer review Performing an audit Latest Stories MANAGEMENT ACCOUNTING All articles Financial reporting Human resources Planning and budgeting Risk management Earlier versions of the spreadsheet, including its immediate predecessor, give the correct answers. But I've got some pretty good suspicions, so I'll do my best to explain the background that leads to the problem, and what I think is probably going on. (Another excellent http://sandon.org/excel-2007/excel-error-2007.php

That said, CPUs have gotten pretty fast. Customers don't expect a spreadsheet program to perform a vanishing act (a la David Copperfield) with their data. Such errors are typically considered insignificant **or immaterial because they rarely manifest** into meaningful calculation errors; nonetheless, here are two measures you can take to eliminate potential floating decimal point errors: Want to know more? More hints

you may have noticed that I said that this bug exists for numbers which are extremely close to 65,535, but not for 65,535 itself. Download Now! With $ 300 million, I think many people could have been hired just to make sure that the new features of Office 2007 actually work. For example, when you type 77.1, Excel stores this internally using 64 bits: 0100 0000 0101 0011 0100 0110 0110 01100110 0110 0110 0110 0110 0110 0110 0110 The display is

- We're talking about a formatting conversion for display purposes only.
- People often focus on what seems to be a problem without necessarily doing a proper engineering analysis.
- Floating point is annoying, seriously annoying.
- And errors like this are so easy to miss, while catching them in testing is almost impossible.
- In Excel 2003, 2002, and 2000, from the Tools menu, select Options, and on the Calculation tab, under Workbook options, check the Precision as displayed box, and then click OK. Latest
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- It all matters.
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- Off the top of my head, I can't think of anything that would cause this behavior.
- They're not going to toss their super-optimized, hand-crafted, whiz-bang numeric code into the package with the compiler.

To make matters worse, floating point doesn't using base-10. Your email Submit RELATED ARTICLES Understanding Excel 2007's Formula Error Values Excel Data Analysis Tools Excel Array Functions for Statistical Analysis Some Excel Worksheet Functions for Statistical Analysis Statistical Analysis with The more you do, the larger the accumulated effects of roundoff errors can become. Microsoft Excel 2007 Mathematical Functions Ben, Newton's algorithm is notoriously finicky when you start it somewhere that isn't near enough to the root you're looking for.

Drang October 2, 2007 I would expect the code that converts back to decimal for display to be part of the compiler, and not anything that the Excel programmers would touch. At the same time, you want to get the number out correctly - so along with doing your clever optimization, you're always keeping your eyes open for one of the cases And this number, which is very close to 65,535, happens to be one of only 12 possible floating point numbers which trigger this bug in Excel. http://www.journalofaccountancy.com/issues/2014/mar/excel-calculation-errors.html Please try the request again.

Finally, there's so much effort that goes in to these highly optimized routines that most companies don't just want to give it away to the competition. How To Fix Rounding Errors In Excel Easy! When you try, Excel displays 12345678987654300. Cells containing this value display as **100,000, but from VBA, they're** going to look like 65,535 (since the number would be passed into the Basic runtime in binary, before the display

For example, in base-10 4 digit floating point, with 1-digit exponents, if you have (0.1E-9)×(0.3E0)×(0.4E8), if you do the first pair of numbers first, it evaluates to 0E0×0.4E8=0. http://www.computerworld.com/article/2541211/desktop-apps/excel-2007-flunks-some-math-problems.html Second, one of the most notorious flaws among programmers is inappropriate optimization. Excel Math Bug As a result, you need to either implement lazy evaluation; add some static analysis; or always generate display forms. Mathematical Formulas In Excel 2007 There's still room for some loss of precision, but not so drastically as you describe.

So if you use the cell in another formula (for example, if the mistakenly displayed presentation of 100000 appears in cell A1 and you enter the formula =A1*2 in another cell, check my blog So you can imagine how, in decimal, if you tried to do 3*1/3, and you didn't have time to write 3's forever, the result you would get would be 0.99999999, not If Excel’s arithmetic fails, then what else is false, and why does this happen? ( Author’s note: You must increase the column width size to view the full number mentioned A: I'm not sure exactly, since I don't have the code. Mathematical Symbols In Excel 2007

ScienceBlogs is a registered trademark of ScienceBlogs LLC. Slowing things down a tiny bit - taking an extra microsecond per conversion - can have a huge impact on the performance of the system. If they share it at all, it's a high-price add-on. #6 Mark C. this content My Excel has been installed only a few weeks ago, perhaps the bug had been corrected in the meantime.

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The usual expectation is that if you need to worry about that, you'll do it yourself, in a way which is best suited towards your particular application. You can only reliably catch this kind of problem by doing a detailed analysis of the logic of the code, and all you need to do is miss one out of To prove that Excel knows its multiplication tables, he suggested entering 850*77.1 in Excel 2007 -- yielding the incorrect 100,000 -- then multiplying the result by 2. Excel Round Function Not Working Comments By Gregg Keizer Follow Computerworld | Sep 26, 2007 1:00 AM PT RELATED TOPICS Desktop Apps Malware & Vulnerabilities Windows 10 Microsoft Comments