trigonometry functions

Hi.i m a beginner.
What should i write in expression line in evaluate component for trigonometry functions such as xsin(x).
I know there is sin component in newest version but i cant use xsin(x) for example.

Replies to This Discussion

Permalink Reply by Hannes Löschke on May 3, 2014 at 5:48am

So what exactly is the xsin function?

If what you are referring to is a contracted version of x * sin (x), you can use the Evaluate component to evaluate basically any math expression. Just make sure you don't omit math operators like multiplication (*) that you typically omit when writing that in formula in a textbook.

Permalink Reply by hodjat alipoor on May 3, 2014 at 6:44am

what is the problem?

Permalink Reply by Igor on May 3, 2014 at 7:42am

You must remove the quotes at the start and end of expression.......

Permalink Reply by hodjat alipoor on May 3, 2014 at 10:00am

why?

Permalink Reply by Ángel Linares on May 3, 2014 at 10:03am

Y = Null? If you don't use it, remove it.

Permalink Reply by hodjat alipoor on May 3, 2014 at 12:14pm

y is default in evaluate component in grasshopper 0.9 .how can i remove it?

for x*sin(x) i did it , but this algorithm is absolutely useless for complicated operations.

i dont know what is the problem yet.

Permalink Reply by David Rutten on May 3, 2014 at 12:18pm

To remove or add inputs, zoom in, then either click the (-) symbols to remove parameters or click the (+) symbols to insert parameters.

David Rutten

david@mcneel.com

Permalink Reply by hodjat alipoor on May 3, 2014 at 12:37pm

thank you mr rutten, but my problem was not solved.

when i write cos(x) in expression line , unknown variable encountered : cos , is displayed in errors line and component gets red,

when i write "cos(x)" , no syntax errors is displayed and component gets gray but point component gets red and nothing is displayed in rhino.

the book i m reading has been written by Tedeschi for GH 0,6 and in book , sin(x) has been written in expression line and no syntax errors has been displayed!

i dont know why it dosnt happen for GH 0.9 and what is my error.

Permalink Reply by Hannes Löschke on May 3, 2014 at 3:35pm

Cos() should be a valid function. If you click the function in the top right corner, all valid operations should be listed. If this list is very short or empty, check your gh installation and make sure you have the latest version.

everything between " " marks will be treated as text and echoed back. That's obviously never going to fail, just doesn't produce any results either.

Permalink Reply by hodjat alipoor on May 4, 2014 at 2:03pm

thank you mr loschke,

function list is empty in GH 0.0071 or maybe my version was faulty!

i installed GH 0.007 and my problem was obviated.

now i can use math operations.

thanks again.

Permalink Reply by Hannes Löschke on May 4, 2014 at 2:38pm

You should update to the current version, which is 0.9.0075, not downgrade...

Permalink Reply by 筑梦NARUTO on May 4, 2014 at 7:38pm