Hp 35s integrating with complex numbers/functions

Are there any examples of how to integrate a complex function for
the HP 35s..the manual suggests its possible..but, I can not find one
example...anywhere... I am just interested in testing.....I do
not want to break things into parts etc...I just want to try
e^z for example, where z is complex..any help?
I have tried xiy, rTheta, x+iy...syntax errors or non existent..funny

Hi,
The manual states that complex numbers can be used with EXP(x), but it does not mention anything about using complex numbers for integration. Edit: I missed some text in the manual, see below.
As far as I can tell it cannot do integration with complex numbers. (The 50g can do this.)
However, you may get a more definitive answer if you ask your question here:
http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/forum.cgi
EDIT: that forum has moved to a new version:
http://www.hpmuseum.org/forum/forum-4.html
Note: I do not work for HP, I just like playing with calculators :-)

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Having trouble converting array to spreadsheet string, storing the file and coverting back to array with complex numbers

I am working with a network analyzer. I have arrays made of 5 columns the first consisting of an integer and the next four consisting of complex numbers. I am converting the array into a spreadsheet string and then saving the file using the write characters to a file VI. That seems to work well as when I open the file in Excel all the data is there. However when I try to reverse the process, open file and convert back to array, I loose some of the data. Specifically the imaginary parts of my complex numbers are all going to zero. I have narrowed down the problem to be in the conversion from spreadsheet string to array and vice versa. I
think the problem may be with the 'format' input to the VI. I do not have an adequate resource for this so I am not sure what to put in to accomplish my task. Any takers?

Hi Biz
I don't think there is a direct way of converting a complex number to a
string, so when you convert the array to a spreadsheet string, the
numbers would be converted to real data.
However, you could try separating the real and imaginary parts using the
"Numeric: Complex to Re/Im" function, and then store these - either in
separate files or in adjacent columns/rows in the same file. Then, when
you read in the data again, use the "Numeric: Re/Im to Complex" function
to put the two "halves" together.
If you actually want Excel to interpret the numbers as imaginary, then
you'll probably want to create a string for each complex number of the
form "Re + Im*i" (after separating the Re and Im parts), by using
"String:Format into String" with 2 numeric inputs and the format string
"%f+%fi".
Reading the data back into Labview then would require splitting the
string into the 2 pieces by using "Stringcan from String" with 2
numeric outputs (smae precision as original numbers specified by the 2
Default Value inputs) and the same format string "%f+%fi", and then using
the above-mentioned "Numeric: Re/Im to Complex" function. It worked for
me, so if you can't follow what I am describing, send me an email and I
can email you what I did (LV 5.1.1).
Paul
Biz wrote:
> Having trouble converting array to spreadsheet string, storing the
> file and coverting back to array with complex numbers
>
> I am working with a network analyzer. I have arrays made of 5 columns
> the first consisting of an integer and the next four consisting of
> complex numbers. I am converting the array into a spreadsheet string
> and then saving the file using the write characters to a file VI. That
> seems to work well as when I open the file in Excel all the data is
> there. However when I try to reverse the process, open file and
> convert back to array, I loose some of the data. Specifically the
> imaginary parts of my complex numbers are all going to zero. I have
> narrowed down the problem to be in the conversion from spreadsheet
> string to array and vice versa. I think the problem may be with the
> 'format' input to the VI. I do not have an adequate resource for this
> so I am not sure what to put in to accomplish my task. Any takers?
Research Assistant
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SVD with complex numbers

I'm working on creating a SVD class using complex numbers. I have an adaptation of the Jama ( http://math.nist.gov/javanumerics/jama/ ) implementation coded which works great with complex numbers with only a real part, but fails when the imaginary is present. I also coded up a port of numerical recipes' ( http://www.nr.com ) implementation, but am unable to get it to converge. I'm 99.9% sure that the problem does not exist in my complex number class as it has worked fine up until now.
Anyhow, what I'm wondering is if anyone has a Java SVD for complex matrices that I could look at and/or use?
Thanks in advance,
m

It wasn't working when I tried it a few months ago. I found the bug in the database - it's been long-standing. Given that Sun doesn't appear to be supporting Java3D very well, I doubt it'll ever be fixed.
Besides, that SVD algorithm is only for real matricies, I believe. - MOD

In range and coerce with complex numbers?

I have an array of complex numbers with these numbers I need to set to 0 all numbers whose real parts are negative. With "in range and coerce" I can split the array into real and imaginary then set all negative numbers to 0 then recombine the complex part but that still leaves me with 0+ai numbers that should be 0. How can I also set the complex part to zero for the negative numbers?

Hello,
You can use the following fonction in a for loop with your array.
Michel

Join numeric with join numbers function

Hi ! a small question from a guy that didnt use labview for a while !
i need to use the join number function to join two DBL number A and B to form a new number A.B, just like the join numbers function
in the example i would like the results after the join number function to be 1.5
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A and B are extracted from modbus READ register command and are unsigned 16 bit
seems easy enough but i need a good refreshment on how those bits, bytes and numeric works together.. doh !
thank for everyone involved, Kudos to all labview champions!
Solved!
Go to Solution.
Attachments:
join numbers.png ‏108 KB
test comm.png ‏91 KB

Hi yan,
it seems you really need a refreshment on all those bits/bytes/numeric representations
Typecasting floats (DBL) to U16 will probably never result in the desired value.
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How to use RLS with complex numbers as the input?

I import a file which have complex numbers, and I want to filter it using complex RLS adaptive filter, but it always freeze at the filtering and update then it returns one value in the matrix and all the other numbers are NaN, so how can I fix this.
The second thing is when I use FBLMS, it always return error 42020 unless I specify the filter length= number of the input which is huge number, so how do I specify normal filter length.

Hi engomar,
There is a detailed description of how to choose filter length in the Adaptive Filter Tollkit Help file.
http://zone.ni.com/reference/en-XX/help/372357B-01/lvaftconcepts/aft_choose_filterlength/
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Robert R. | Applications Engineer | National Instruments

Need help with complex numbers ..

Hi!
Just want to check if i got it right - if anyone could pls confirm:
public void divComplex(Complex a, Complex b)
x = ((a.x * b.x) + (a.y * b.y))/((b.x * b.x) + (b.y * b.y));
y = ((a.y * b.x) + (a.x * b.x))/((b.x * b.x) + (b.y * b.y));
public void multComplex(Complex a, Complex b)
x = ((a.x * b.x) - (a.y * b.y));
y = ((a.x * b.y) + (a.y * b.x));
where:
protected double x;
protected double y;
is declared to represent the complex number .
Is this correct?
Siw

For the division you have,
a/b = a*b'/b*b' = a*b'/|b|
|b| = (b.x + ib.y)*(b.x - ib.y) = b.x*b.x + b.y*b.y
a*b' = (a.x + ia.y)*(b.x - ib.y) =
(a.x*b.x + a.y*b.y) + i(a.y*b.x - a.x*b.y)
There seems to be a slight mistake in the imaginary part (y).
y = a.y*b.x - a.x*b.y / (b.x*b.x + b.y*b.y);
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I NEED HELP!!!. with complex numbers

Hi, I need your help on creating a class called Complex for storing and performing arithmetic operations on a complex number. I am very new using java. The header of the problems is as follow:
Create a class called complex for storing and performing arithmetic operations on a complex number. Private data members should be provided to store the real and imaginary parts of the Complex object. Provide two constructor methods: one with no arguments that initializes the Complex object to 0 + 0i, and one that enables an object of this class to be initialized with arguments when it is created. Inclued public member functions to:
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- "substract" two Complex arguments and store the difference in the current Complex object.
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I will appreciate your help about how i can create a constructor method that initialize the complex object to 0 + 0i.
I am really stuck in creating the constructor for using it in the add, substrac, and multiply method. Another problem that i have is that when a user enter a complex number, they are going to enter as
(3.2 + 2.7i) so what i am going to do with the "i"?
I really appreciate your help.!!! thank you....

I don't understand how I am goint to create a
constructor with no arguments that initializes the
Complex object to 0 + 0i.
Should it be like:
public Complex()
real = 0,0;
imaginary = 0,0;
What I thinks is that I need to have something like:
public Complex()
cplx = real + imaginaryi
then if I do this like I showed before, then what I am
goint to do with the "i" in the imaginary part. Is
there another way to do this or I am wrong or not
understanding the concept?You've got a good start, but you seem to be missing a little bit.
Your first constructor is good.
You seem to thing the second constructor "...that enables an object of this class to be initialized with arguments when it is created" needs to take the string "3 + 4i". You may want to clarify with your instructor, but I don't think that's necessary. Instead, it should probably just take two float or double arguments--one for the real part and one for the imaginary part.
public Complex(you need params here--I'll let you figure out what they are)Try that first, then work on the arithmetic and printing operations.

Using complex numbers in Fletcher Reeves optimization method

Hello,
I would like to minimize a function of 4 complex variables with the Fletcher Reeves optimization method (Conjugate Gradient VI).
Is it possible to do it with this VI or with HiQ4.5 ?
(for S-parameters specialists) The purpose is to de-embed using optimization method.
Thanks,
Dze

I believe that the "Conjugate Gradient nD.vi" and the optimize function in HiQ only work with real vectors. Most of the solve functions in HiQ work with complex numbers, and you may be able to create your own algorithm for the purpose, but I don't think that there is already a function that will do quite what you want.

Saving complex numbers?

Hello all,
I need to save a calibration file...simple enough, but my calibration file is an array of complex numbers. I tried to find the proper precession (ie. %.3f) but I couldn't locate the precession extension for complex numbers. When I try to save the array I loose all of my complex numbers...so how do you save an array with complex numbers?
Thanx
Azazel
Azazel
Pentium 4, 3.6GHz, 2 GB Ram, Labview 8.5, Windows XP, PXI-5122, PCI-6259, PCI-6115

Hi,
You can try the attached VI which is a modified version of Write to Spreadsheet File function so that you can now write complex numbers to a spreadsheet or text file.
Regards,
Ankita
Attachments:
Write to spreadsheet file Complex.vi ‏59 KB

Does java handle complex numbers and operations?

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http://www.vni.com/corner/garage/grande/index.html

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Thanks,
Gopal

Hi,
Go through this link.....
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/d3219af2-0c01-0010-71ac-dbb4356cf4bf
GTR

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Business Partner records with large numbers of addresses -- Move-in issue

Friends,
Our recent CCS implementation (ECC6.0ehp3 & CRM2007) included the creation of some Business Partner records with large numbers of addresses. Most of these are associated with housing authorities, large developers and large apartment complex owners. Some of the Business Partners have over 1000 address records and one particular BP has over 6000 addresses that were migrated from our Legacy System. We are experiencing very long run times to try to execute move in's and move out's due to the system reading the volume of addresses attached to the Business Partner. In many cases, the system simply times out before it can execute the transaction. SAP's suggestion is that we run a BAPI to cleanse the addresses and also to implement a BADI to prevent the creation of excess addresses.
Two questions surrounding the implementation of this code. Will the BAPI to cleanse the addresses, wipe out all address records except for the standard address? That presents an issue to ensure that the standard address on the BP record is the correct address that we will have identified as the proper mailing address. Second question is around the BADI to prevent the creation of excess addresses. It looks like this BADI is going to prevent the move in address from updating the standard address on the BP record which in the vast majority of cases is exactly what we would want.
Does anyone have any experience with this situation of excess BP addresses and how did you handle the manipulation and cleansing of the data and how do you maintain it going forward?
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Specifically, SAP suggested we apply/review these notes:
Note 1249787 - Performance problem during move-in with huge addresses
**applied this ....did not help
Note 861528 - Performance in move-in for partner w/ large no of addresses
**older ISU4.7 note
Directly from our SAP message:
use the function module
BAPI_BUPA_ADDRESS_REMOVE or run BAPI_ISUPARTNER_CHANGE to delete
unnecessary business partner addresses.
Use BAdI ISU_MOVEIN_CUSTOMIZE to avoid the creation of unnecessary
business partner addresses (cf. note 706686) in the future for that
business partner.
Note 706686 - Move-in: Avoid unnecessary business partner addresses
Does anyone have any suggestions and have you used above notes/FMs to resolve something like this?
Thanks,
Nick

Nick:
One thing to understand is that the badi and bapi are just the tools or mechanisms that will enable you to fix this situation. You or your development team will need to define the rules under which these tools are used. Lets take them one at a time.
BAPI - the bapi for business partner address maintenance. It would seem that you need to create a program which first read the partners and the addresses assigned to them and then compares these addresses to each other to find duplicate addresses. These duplicates then can be removed provided they are not used elsewhere in the system (i.e. contract account).
BADI - the badi for business partner address maintenance. Here you would need to identify the particular scenarios where addresses should not be copied. I would expect that most move-ins would meet the criteria of adding the address and changing the standard address. But for some, i.e. landlords or housing complexes, you might not add an address because it already exists for the business partner, and you might not change the standard address because those accounts do not fall under that scenario. This will take some thinking and design to ensure that the address add/change functions are executed under the right circumstances.
regards,
bill.

Hp 35s integrating with complex numbers/functions

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