formula node

[s.turino84]

Hi! I have two problems with the formula node. I want to realize a sine function and show it on the graph.
The first problem is that i'm not able to wire the output (x) with the Waveform graph, the second one is the error in the formula node but i think that it is written properly since i took it from one of my teacher's example.
I have attached the VI. can you give a look at it? Thank you in advance.
Salvatore

[alexderjuengere]

Hi Salvatore,

your output x is just one single value, but a Graph accepts an array of values.

n is not defined in your formula node; just change the formula node's input "length" to "n" and delete the first row.

Regards,
Alex

[s.turino84]

Hi Alex,

the first row is important to create the "time dimension", if I delete it i'll have as result a line with all 1 and not the cos function as I wish.
About the output I have understood that it is a single value but probably I haven't done the right question that is:why isn't it an array? and is it possible to switch it into an array?

Thank you

[crossrulz]

First of all, your output will always be 1 (cos(2*pi*x) = 1).  Are you sure about your formula?  Secondly, just do it in LabVIEW.

[s.turino84]

first i want to learn the formula node 

second:

considering n=t that goes as it was written from 0 to length (lenght could be 100)  and a = 50Hz is it always 1? i think not... 🙂

[Mellobuck]

Like crossrulz said, if n is an integer, the output all always be 1:

[s.turino84]

mmm and what formula should I use? In matlab i used to do cos(2*pi*f*t) 

[crossrulz]

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@s.turino84 wrote:

mmm and what formula should I use? In matlab i used to do cos(2*pi*f*t) 

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And also in Matlab you probably used fractional seconds.  Something like 0:0.1:1 (it has been awhile since I did Matlab, I think that's the correct formatting) would result in an array from 0 to 1 in 0.1 steps.

[RavensFan]

I don't see where you attempted to define a Loop within the formula node.

[alexderjuengere]

I guess the formula is ok, but you need a loop to create an array.

Here's what I had in mind:

but remember crossrulz, if A is an integer, the result will always be one.