how to read complex number

[81452]

I'd like to try IFFT by my experimental data file, which has frequency, Real + Im numbers.

I tried  the Read from Spreadsheet File.vi to read the complex numbers from my data.

Real parts are read but Im parts are not read? Could you tell me how to read whole complex number(s)?

The attached is my data file.

[tbob]

Complex numbers must be treated differently.  I don't know of any LV function that will convert a complex string into a complex number, but here is a vi that will do the trick.  The string must end in i (23.4-14.2i).  The vi separates the real and imaginary parts, and concatenates the signs with the parts.  Then the two strings are converted into regular DBL numbers.  The function Re/Im To Complex (found in Numeric - Complex palette) converts the two numbers into one complex number.  The numeric indicator representation is set for CDB.

[unclebump]

Hi tbob,

Could you post that as 7.0 format?? I was trying to solve it also.

[Chaos]

Grain of salt here as I am not very familiar with using complex numbers in LabVIEW.  But I would assume you would need to seperate the real and imaginary parts and create a complex number from the two.

[tbob]

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you would need to seperate the real and imaginary parts and create a complex number from the two

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Chaos, if you would read my post you will see that this is exactly what I did.

Here is the 7.0 version.

[Chaos]

Yeah tbob I know

I was replying (and then I got busy doing something else) and when I finally submitted there were replys already.  I probably should have edited the message and removed everything but I did not have the time so I just left it there.  Oh well  cant win them all...

[unclebump]

Here is what I did to read it from the file.

[81452]

Thank you All.

What I did was separate the complex number in 2 columns (considered as

2 real numbers and use Re/Im To Complex function to read as a complex number.

My vi is attached.

[81452]

Thank you for your time.

What I did was separate the complex number in 2 columns (considered as

2 real numbers and use Re/Im To Complex function to read as a complex number.

My vi is attached.