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Thread: Revit Formulas for "everyday" usage

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    If I know C and and S, can I get R?

    Quote Originally Posted by Munkholm View Post
    Ever needed to calculate circular segments? Made this one earlier, to get the radial arrays right in this family, but figured that it might come in handy for something else, so saved it out at a early stage.
    If I know C and and S, can I get R?

    PS: this if from the circular segment formula.
    Last edited by Jaapf; November 20th, 2018 at 01:10 PM.

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    Administrator Munkholm's Avatar
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    I believe that it should be possible, but surely would be easier to get R if you also know h

    Link to the article I used back then: https://en.wikipedia.org/wiki/Circular_segment

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    Yes, I also expect it to be possible... Been wrestling with it for a few day now though :-)

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    Quote Originally Posted by Munkholm View Post
    I believe that it should be possible, but surely would be easier to get R if you also know h

    Link to the article I used back then: https://en.wikipedia.org/wiki/Circular_segment
    From that wiki:
    One can reconstruct the full dimensions of a complete circular object from fragments by measuring the arc length and the chord length of the fragment.

    So, it should be possible... no luck so far though :-(

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    Administrator Munkholm's Avatar
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    Found an article which suggest that it's only possible to do an approximation with Newton's method (Sometimes called the Newton-Raphson method)

    I'm usually pretty good at this stuff, but this one have me puzzled, and I'm starting to think that it's not possible after all. But please do let me know if you figure it out.

    Given the arc length and chord length, what is the radius? - Math Central

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    yes, I found those too. I believe you are correct, if smarter guys as us can't find a solution, we should probably just give up

    I will be looking at the approximation, maybe combined in a lookup table to come to a solution for the family.

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    Hello, I don't know if this had been posted before, but I could not find it anywhere here, so I am going to add this info to this thread in case it's useful for someone in the future: how to find the cube root of a value in Revit.

    You know that for square roots we have a function, so we simply type sqrt (x) to find the square root. For example, if x = 16, then sqrt (x) is 4.
    But how do we get the cubic root of a value? I thought there was a function for it, such as crt (x) or cubicroot (x), or croot (x) but no, none of those functions exist in Revit.

    So the syntax for cubic root is this: x ^ (1/ 3)
    For example, you have a parameter x whose value is 129, and you need a number that x * x * x is 129, then you create a new parameter, say "y" and make it equal to x ^ (1/ 3) . The result is 5.052774 , that's the number that multiplied three times by itself gives 129 or actually 128.999...

    In the same way, finding the n root of a value x in Revit is: x ^ (1/n)

    Why was I needing a cube root? Because I needed to find the radius of a hemisphere given its volume, and I read that the formula requires a cuberoot and I didn't know how to do a cuberoot in Revit.
    Attached Thumbnails Attached Thumbnails Revit Formulas for "everyday" usage-2018-12-10_9-04-42.jpg  

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