AN: Gurugram #58...

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Don Lancaster 20 years ago

... is newly available for free downlaod at

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It is on the underlying math behind Bezier Cubic Splines.

Sourcecode separrately appears as

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Other GuruGrams at

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Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com Please visit my GURU\'s LAIR web site at http://www.tinaja.com

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Jonathan Kirwan 20 years ago

Algebra error on page 58.4, first box, last equation.

Jon

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Jonathan Kirwan 20 years ago

Sorry, I meant to write "first box with 4 equations, last equation."

Jon

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hoffmann 20 years ago

You can be sure that Don Lancaster doesn't ever respond to suggestions about corrections for his docs.

[His contribution about the circle segment approximation (here, some time ago) was wrong as well.]

The mentioned doc contains a typo (and you could have shown us a a more constructive correction) :

-3*t^3 should be replaced by -t^3.

Best regards --Gernot Hoffmann

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hoffmann 20 years ago

Now it seems that this bug was corrected by the author D.L. without any feedback to the forum. Really ugly.

Best regards --Gernot Hoffmann

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Don Lancaster 20 years ago

Fixed it just before your post. We always try to seek out negative correction times.

Paper has since also been expanded with new "snake in the box" feature.

Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com Please visit my GURU\'s LAIR web site at http://www.tinaja.com

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Jonathan Kirwan 20 years ago

I didn't want to take away from him, recognizing the exact error. It was entirely too much to say as much as I did.

Jon

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Jonathan Kirwan 20 years ago

Now if we can just put that phase delay into closed loop control, we'd be in serious business!

Jon

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Don Lancaster 20 years ago

That's what makes digital filters so much better than analog ones. You can have negative time simply by backing up one tap.

Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com Please visit my GURU\'s LAIR web site at http://www.tinaja.com

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Kaba 20 years ago

Another problem is that the paper actually describes Bezier curves (polynomials), not splines (piecewise polynomials).

Kalle Rutanen http://kaba.hilvi.org

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Don Lancaster 20 years ago

-- observable by viewing the title.

Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com Please visit my GURU\'s LAIR web site at http://www.tinaja.com

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Phil Hobbs 20 years ago

Riiiggghhhtttt. Everything's possible with digital--even time machines!

Cheers,

Phil Hobbs

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Jonathan Kirwan 20 years ago

I'd noticed that.

Jon

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Jonathan Kirwan 20 years ago

Which says, "The Math behind Bezier Cubic Splines"

Jon

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Carl Smith 20 years ago

This makes me laugh a bit and think about all the times I've had to explain to people how it is possible that a digital oscilloscope can trigger at a set time before a trigger event. :-)

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Don Lancaster 20 years ago

Actually, most all analog scopes also do this with a fixed delay line.

Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don@tinaja.com Please visit my GURU\'s LAIR web site at http://www.tinaja.com

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AN: Gurugram #58...

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