I want to evaluate a formula which has complex numbers please help me????

[girikavali]

I'm a begineer in labview. I want to evaluate an equation which has complex numbers through text code.. Any suggestions Please????

for(f=0;f<=2560;f=f+0.3125)

{

     R=((H12-e^(-i*k))/(e^(i*k)-H12))*e^(i*k);

}

where H12 is 1d array of complex number

            i         square root of -1

            k         function of frequency

            f          frequency

[MHoffmann]

Just use a For-loop in combination with a 1d-array of complex numbers. The following example shows the usage of a array of complex numbers:

https://decibel.ni.com/content/docs/DOC-28831

Or is there any other problem?

Regards,

Michael

[MarcoMauri]

Hi!

You could try using a script node (http://zone.ni.com/reference/en-XX/help/371361H-01/lvconcepts/scriptnodes/) if you have MATLAB installed on your PC.

Or you can implement it in Labview, since there is a Complex data type (actually more than one).

Here's a snippet as a draft/starting point:

[crossrulz]

Would you know how to do this if they weren't complex numbers?  If so, then all you have to do is change the numberic representation to a complex data type.

[eyeballxxx]

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@girikavali wrote:

I'm a begineer in labview. I want to evaluate an equation which has complex numbers through text code.. 

---

Are you saying you don't want to use LabVIEW to evaluate this? In which case I suggest asking on a different forum.

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for(f=0;f<=2560;f=f+0.3125)

{

     R=((H12-e^(-i*k))/(e^(i*k)-H12))*e^(i*k);

}

---

There is no 'f' in the loop, I don't understand what the loop would evaluate, unless k is a constant in which case the loop is redundant.

---

            k         function of frequency

            f          frequency 

---

If k is a function of frequency you need to say what that function is. For example if you are evaluating 'k' for changing 'f' and applying it to the equation for R. I don't know what the best procedure would be but my first port of call would be nested loops: 'R' for each 'k' for each 'f' ?

In the absence of a function for k this vi would evaluate you formula for k=f, I don't know if this wil help any.

[girikavali]

Thank you Marco Mauri & Michael for your sugesstions..

I have implemented it by using loop as you said, but it looks little bit messy, and it becomes difficult to debug,

So, script node will be  a better choice. since in my program there are many such equations.

I don't have matlab installed in my PC, but i have scilab installed can i use it, If possible i want to know the syntax...

Thanks and Regards,

Giridhar

[GerdW]

Hi girikavali,

- when the VI looks messy you should clean it up (there even is the automatic cleanup tool...)

- What means "difficult to debug"? A script node / formula node / scilab node is even more difficult to debug...