Re: [Chicken-users] Using epsilon in test egg

On 29/07/14 04:58, Alex Shinn wrote: > On Mon, Jul 28, 2014 at 10:09 PM, John Cowan > wrote: > > Alex Shinn scripsit: > > > If people think it's useful I'd consider walking pairs and vectors. > > They are the most important cases, because the expected val

Re: [Chicken-users] Using epsilon in test egg

On Wed, Jul 30, 2014 at 10:00:00PM +0900, Alex Shinn wrote: > On Wed, Jul 30, 2014 at 9:33 PM, John Cowan wrote: > > > Peter Bex scripsit: > > > > > While you're looking at that, could you also take a look at this ticket? > > > https://bugs.call-cc.org/ticket/935 > > > > That was from 22 months

Re: [Chicken-users] Using epsilon in test egg

On Wed, Jul 30, 2014 at 9:33 PM, John Cowan wrote: > Peter Bex scripsit: > > > While you're looking at that, could you also take a look at this ticket? > > https://bugs.call-cc.org/ticket/935 > That was from 22 months ago... I don't remember exactly when it was fixed but it works now. Closed th

Re: [Chicken-users] Using epsilon in test egg

Peter Bex scripsit: > While you're looking at that, could you also take a look at this ticket? > https://bugs.call-cc.org/ticket/935 In addition, the page on comparing floats that you pointed to now has a replacement:

Re: [Chicken-users] Using epsilon in test egg

On Mon, Jul 28, 2014 at 09:46:57PM +0900, Alex Shinn wrote: > Regardless, I'll add a utility to make defining tests with your > own comparator easier, and explicitly export test-approx-equal? > so you don't have to capture the initial test comparator. While you're looking at that, could you also t

Re: [Chicken-users] Using epsilon in test egg

On Mon, Jul 28, 2014 at 10:09 PM, John Cowan wrote: > Alex Shinn scripsit: > > > If people think it's useful I'd consider walking pairs and vectors. > > They are the most important cases, because the expected value is > expressed as a literal value, and that can only be a list or vector. Actual

Re: [Chicken-users] Using epsilon in test egg

Alex Shinn scripsit: > If people think it's useful I'd consider walking pairs and vectors. They are the most important cases, because the expected value is expressed as a literal value, and that can only be a list or vector. If you are using `test-assert`, you can specify your own function direc

Re: [Chicken-users] Using epsilon in test egg

On Mon, Jul 28, 2014 at 9:30 PM, John Cowan wrote: > Alex Shinn scripsit: > > > The solution is definitely not to write your own comparison function, > > and trust that the test egg is doing the right thing. > > It isn't, though, not quite. What it needs to do is not a dichotomy of > "if inexact

Re: [Chicken-users] Using epsilon in test egg

Alex Shinn scripsit: > The solution is definitely not to write your own comparison function, > and trust that the test egg is doing the right thing. It isn't, though, not quite. What it needs to do is not a dichotomy of "if inexact, use epsilon, otherwise use `equal?`" but rather to have a versi

Re: [Chicken-users] Using epsilon in test egg

On Sun, Jul 27, 2014 at 10:03 AM, Matt Gushee wrote: > Hmm, just realized something. The test egg documentation also says: > > "Percentage difference allowed ..." > > So if the expected value is 0, then no variance is allowed? If that's > true, then epsilon isn't what I want anyway. I need to a

Re: [Chicken-users] Using epsilon in test egg

On Sun, Jul 27, 2014 at 11:02 AM, Alex Charlton wrote: > > Matt Gushee writes: > > > I guess my explanation wasn't entirely clear, but that's pretty much > > what I was already doing. I showed the equality predicate I was using, > > which tests individual values in the list with = . I think my mi

Re: [Chicken-users] Using epsilon in test egg

On Sun, Jul 27, 2014 at 10:03 AM, Matt Gushee wrote: > Hmm, just realized something. The test egg documentation also says: > > "Percentage difference allowed ..." > > So if the expected value is 0, then no variance is allowed? Naturally we handle this case correctly and check the absolute dif

Re: [Chicken-users] Using epsilon in test egg

Matt Gushee writes: > I guess my explanation wasn't entirely clear, but that's pretty much > what I was already doing. I showed the equality predicate I was using, > which tests individual values in the list with = . I think my mistake > was in assuming that (current-test-epsilon) would apply to

Re: [Chicken-users] Using epsilon in test egg

Hi, John-- On Sat, Jul 26, 2014 at 7:47 PM, John Cowan wrote: > Matt Gushee scripsit: > Other posters have addressed the main issues, but I'll just point out > that "inexact comparison" means "comparison for equality of inexact > numbers". Epsilon is applied only by the default predicate: it's

Re: [Chicken-users] Using epsilon in test egg

Hi, Alex-- On Sat, Jul 26, 2014 at 7:11 PM, Alex Charlton wrote: > The problem you’re having is because test only uses the approximate > comparison (using current-test-epsilon) when the _expected_ value is inexact: > http://api.call-cc.org/doc/scheme/inexact%3F Thank you. That clarifies thing

Re: [Chicken-users] Using epsilon in test egg

Matt Gushee scripsit: > I guess I don't really understand how > epsilon is supposed to work. The test egg documentation says that > applies to 'inexact comparisons', but I can't find a definition of > 'inexact comparison'. I have also read that '=' may be unreliable for > inexact numbers, but I do

Re: [Chicken-users] Using epsilon in test egg

On Sat, Jul 26, 2014 at 6:57 PM, Alaric Snell-Pym wrote: > It's probably best to define your own equality predicate, I think! Yes, I think you're right. Thanks! ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/l

Re: [Chicken-users] Using epsilon in test egg

Hi Matt, The problem you’re having is because test only uses the approximate comparison (using current-test-epsilon) when the _expected_ value is inexact: http://api.call-cc.org/doc/scheme/inexact%3F Since your expected value is a list (i.e. inexact? will result in #f given a list), test is t

Re: [Chicken-users] Using epsilon in test egg

Hmm, just realized something. The test egg documentation also says: "Percentage difference allowed ..." So if the expected value is 0, then no variance is allowed? If that's true, then epsilon isn't what I want anyway. I need to allow an absolute amount of variance that is independent of the va

Re: [Chicken-users] Using epsilon in test egg

On 27/07/14 01:42, Matt Gushee wrote: > I can certainly define a custom equality predicate that will do what I > need, but this is bugging me. I guess I don't really understand how > epsilon is supposed to work. The test egg documentation says that > applies to 'inexact comparisons', but I can't f

[Chicken-users] Using epsilon in test egg

Hi, folks-- I am working on an application that does a lot of floating-point calculations, and I'm having trouble with the test suite. The program is based on the imlib2 egg, and it does some fairly simple image processing for web applications, so the numbers in question are RGBA color values. Int