topic Re: Add Inverse trig function into parameters menu in Fusion Support Forum

Add Inverse trig function into parameters menu

scott.nortman — Tue, 01 Aug 2017 00:22:33 GMT

When entering new parameters, inverse trig (asin, acos, atan) function are not available as expression functions. Is this expected?

Re: Add Inverse trig function into parameters menu

ahreum.ryu — Tue, 01 Aug 2017 01:12:52 GMT

Hi @scott.nortman,

Welcome to the Fusion community!

I think we are able to use the Inverse trig with acos(expr) , asin(expr) , atan(expr)

For your reference, this is Prefix Parameter for Inventor. (I think it's working in Fusion 360) it will be helpful.

If you have further questions, please let me know!

Many thanks,

Ahreum.

Re: Add Inverse trig function into parameters menu

scott.nortman — Tue, 01 Aug 2017 03:32:16 GMT

Thanks.

I reviewed the link you sent, and only some of the functions work in the
'expression' text entry box; for example, if I enter

'sin(PI rad)'

the returned value of the expression is correctly 0.

However, when I change to atan( 0 ) the text stays red, since the atan
function is not recognized.

I suspect this is just not yet supported in Fusion 360.

Best regards,
Scott

Re: Add Inverse trig function into parameters menu

HughesTooling — Tue, 01 Aug 2017 15:49:56 GMT

Did you set the unit type correctly?

Re: Add Inverse trig function into parameters menu

scott.nortman — Wed, 02 Aug 2017 01:46:54 GMT

Yes, I even tried constant values such as atan( 0 )

Re: Add Inverse trig function into parameters menu

HughesTooling — Wed, 02 Aug 2017 08:39:56 GMT

Can you install screencast and record what you're doing because it does work.

Mark

Re: Add Inverse trig function into parameters menu

Anonymous — Fri, 01 Jun 2018 10:35:52 GMT

I am having the same issue

cos() etc work, but all of these stay red:

atan(1)

atan2(1)

atan(1,2)

atan2(1,2)

Nothing complicated, I just go to Parameters, Add, and type in a name and the expr as atan(1) etc

And yet its in the documentation as working... perhaps its been left out of recent build somehow?

Re: Add Inverse trig function into parameters menu

HughesTooling — Fri, 01 Jun 2018 12:09:35 GMT

Can you get a screen grab of what you see. Embed the picture using the Photo option don't attach.

Mark

Re: Add Inverse trig function into parameters menu

Anonymous — Fri, 01 Jun 2018 12:50:00 GMT

Re: Add Inverse trig function into parameters menu

HughesTooling — Fri, 01 Jun 2018 12:51:59 GMT

You have the units set to mm the result is degrees so you need to set units to deg.

Mark

Re: Add Inverse trig function into parameters menu

Anonymous — Fri, 01 Jun 2018 12:54:52 GMT

Great, thanks!

It would be a nice feature if it could work that out automatically from the result of the expression.

Re: Add Inverse trig function into parameters menu

jeremiahrose — Sun, 31 Mar 2019 11:30:49 GMT

How then do you add a more complex expression, e.g such as 1 / acos(1)?

No matter what units I select in the drop-down menu, this expression is always red, so it cannot be added.

Seems like a very short-sighted limitation!

EDIT - looks like the "percentage" unit works for the above equation. However, for an expression containing an inverse hyperbolic trig function as the denominator e.g 1 / acosh(2), the percentage unit no longer works and I cannot find any unit that does. This behavior is pretty bizarre and seems to nullify the usefulness of having these functions available in the first place... It seems to me that the "No units" option should be available for any arbitrary expression as a fall-back, so maybe this is a bug?

Re: Add Inverse trig function into parameters menu

HughesTooling — Sun, 31 Mar 2019 15:52:25 GMT

@jeremiahrose Looks like it's been reported as a bug a while ago.

https://forums.autodesk.com/t5/fusion-360-support/asinh/m-p/8073237?collapse_discussion=true&filter=location&location=category:1234&q=asinh&search_type=thread

Might want to bump that thread or start another rather than leave it buried here.

Mark

Re: Add Inverse trig function into parameters menu

jeremiahrose — Thu, 11 Apr 2019 10:26:56 GMT

Looks like this issue is now fixed in new update