All:

A problem was discovered in v1.3.1 (and 2.3.1 for those of you that own Calculator12) that may cause the calculator to fail to compute the interest rate for a certain class of problems. These problems will return a message "could not calculate i (2)". I have located the cause of the discrepancy as well as a fix but need to confirm the fix with Roy before I upload it.

I do appreciate your patience.

Kim

## v1.3.1 and v2.3.1 have a problem...

### Re: v1.3.1 and v2.3.1 have a problem...

Roy and I are finally happy with the fix, and it was uploaded to Apple this morning. Expect an update shortly!

For those that are curious, the problem arose because I was programming a solution with more precision than is 100% reliable using IEEE floating point math, so in the effort to eek the 15th decimal place from the interest rate in some situations the calculation would not "settle down" at that last decimal place. Since any failure to settle down makes it appear as if the solution isn't behaving I was declaring an inability to solve for the interest rate. Being a little less picky about what constitutes "settled down" in the last decimal place has addressed the problem.

Kim

For those that are curious, the problem arose because I was programming a solution with more precision than is 100% reliable using IEEE floating point math, so in the effort to eek the 15th decimal place from the interest rate in some situations the calculation would not "settle down" at that last decimal place. Since any failure to settle down makes it appear as if the solution isn't behaving I was declaring an inability to solve for the interest rate. Being a little less picky about what constitutes "settled down" in the last decimal place has addressed the problem.

Kim

Last edited by theDev on Fri Feb 06, 2009 10:33 pm, edited 1 time in total.

### Re: v1.3.1 and v2.3.1 have a problem...

Thanks, Kim. I will await the update.

Jaimer7

Jaimer7

### Re: v1.3.1 and v2.3.1 have a problem...

In case you missed it, the fix has released and is available for update (free of course!).

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