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## Excel Math Bug

## Mathematical Functions In Excel 2007

## I think that if we really were interested in optimizing hardware resources for what most people used them for, we'd have gone instead with hardware support for rational arithmetic.

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Bad luck! They do have an option for columns to store a number in IEEE format for reduced precision, but potentially faster math operations. #2 Dr. A Microsoft spokeswoman, however, said a date had not been set for the fix, or for its appearance on WU and WSUS. All I'm not buying is (1) the theory that there's some sort of preliminary "code that tries to prevent generating numbers like 1.99999999999999999 instead of 2" that's separate from the "code news

All rights reserved. Floating point performance and memory usage is more predictable. #13 jackd October 2, 2007 I've still got some GeoWorks disks around here. Finally, it's mostly a display bug - but not entirely. Your cache administrator is webmaster. http://www.accountingweb.com/technology/excel/math-errors-found-in-excel-2007

For those of you who haven't heard about this, in Excel 2007, floating point calculations that should result in a number very, very close to either 65,535 or 65,536 are displaying See how much you know about this and other recent news with this short quiz. I’m Joel Spolsky, co-founder of Trello and Fog Creek Software, and CEO of Stack Overflow. You specified an intersection of two cell ranges whose cells don’t actually intersect Because a space indicates an intersection, this error will occur if you insert a space instead of a

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 What seems obvious from the outside might be a terrible choice from the inside, because of the structure and complexity of the code. (3) Even if the structure of the code It's binary: so numbers are really represented by a base-2 fraction and a base-2 exponent. Microsoft Excel 2007 Mathematical Functions Where extended amounts of precision or range were needed, hardware acceleration for bignums would work.

Excel doesn’t recognize a name This error value appears when you incorrectly type the range name, refer to a deleted range name, or forget to put quotation marks around a text Mathematical Functions In Excel 2007 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, Falvo II October 2, 2007 Flaky, 10 to 15 years ago, there was a computer OS called PC/GEOS (aka GeoWorks) whose display engine was 20 years ahead of its time. More about the author Required fields are marked *Comment Name * Email * Website Newsletter Sign Up Advertisement Popular Articles In Tech, Return Measures are Better than Margins Partying Like It’s 1999Metric of the Month:

Here are six steps to help shore up your systems. How To Fix Rounding Errors In Excel It's actually a very interesting problem, getting the right display of a number. What it looks like is that the rounding-error correction is probably over-doing its job; it's doing the roundoff and presenting its result back to the output code in what looks like If you use the number further along in calculations, for example, if you add 2 to the results, you'll get the right thing. =77.1*850 -> displays 100000 =77.1*850+2 -> displays 65537,

- 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
- You can test that code on billions of different values, and still miss the crucial couple that reveal the problem.
- Excel uses several error values, all of which begin with the number sign (#).
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- Also, a drop-down button appears to its right that you can click to display a drop-down menu with the following options: Help on This Error: Opens an Excel Help window with
- 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
- Look closely at the binary representation for 77.1: 0100 0000 0101 0011 0100 0110 0110 01100110 0110 0110 0110 0110 0110 0110 0110 See how there's a lot of 0110 0110
- Whoops. #37 Mark C.
- To make matters worse, floating point doesn't using base-10.
- Still, the Microsoft Excel support team has spent the last 20 years defending IEEE 754, and it's not surprising that they've started to believe in it.

We ran into a more fundamental problem with number representations in a Dynamical Systems class once. http://www.computerworld.com/article/2541211/desktop-apps/excel-2007-flunks-some-math-problems.html Q: What caused the bug? Excel Math Bug The problem that has been isolated so far occurs when a calculation should produce the result of 65535. Mathematical Formulas In Excel 2007 Still, CPAs should be aware that Excel is vulnerable to producing such errors.

The "fixing up" of numbers - making 1.99999999 print as "2" is just part of displaying the number. navigate to this website It doesn't actually change the storage value of the number - just the display representation. Sorry, Marc. So you do get unfortunate tradeoffs, like not doing certain kinds of optimizations on the user-written spreadsheet code, because that would create problems for your users. #35 g October 7, 2007 Mathematical Symbols In Excel 2007

Second, most console IO doesn't spend a lot of time worrying about things like best-possible-roundoffs. Try it, and remember to increase your column width and decimal places so you can see the calculation problem. For example, the formula =13107*5 produces the correct result of 65535. More about the author Click on the OK button.

I'm just trying to explain the bug a little bit as a public service. Excel Rounding Error Example It's only in the display though - the underlying number is actually represented correctly, so if you subtract 2 from 65,536, you'll get the correct answer of 65,534 - not 99,998. But it was a lovely GUI, and insanely fast.

This is the code that **has the bug that causes a** few numbers which are extremely close to 65,535 to be formatted incorrectly as 100,000. If you do, Excel rounds the digits after the 15th place down to zero. Even if the inputs and outputs are close in size, intermediate values can get huge or tiny. Excel Round Function Not Working That's because 0.1 has no exact representation in binary...

The function f(x) = { x, 0<=x<1/2; x-1/2, 1/2<=x<=1 } (looks like a sawtooth pattern with two teeth) when iterated has points with orbits of every period, but when you simulate Kind regards, Rob (Amsterdam). #42 Douglas McClean August 4, 2008 Regarding some earlier comments about the superiority in certain respects of rational / fixed-point arithmetic, and the relative desirability of hardware Continue to site » Joel on Software Explaining the Excel Bug by Joel Spolsky Wednesday, September 26, 2007 By now you've probably seen a lot of the brouhaha over a bug http://idearage.com/excel-2007/excel-2007-eurotool-xla-error.php uncovers $20M H-1B fraud scheme A Virginia couple and four other people have been indicted for running an H-1B visa-for-sale scheme the...