topic Re: Interpolating S-parameters in LabVIEW

Interpolating 2D array

HoloYolo — Mon, 20 Apr 2020 04:51:08 GMT

Hello! I`m in process to create a programm including interpolating 2D array. I have some trouble with it. Data source is read from TXT file,after this I need to do interpolate between two adjacent columns in my array wich was automaticly created when file was read. Finally i need to create new file with new interpolated data for other values of voltage to use it in future.

When I use block "Read from file",data source correctly reading only in type 'STRING' whithout losing signs after dimentional point. But interpolated block only use format DBL and when I use DBL format,it shows just first sing in array.

Screenshots of program and file I`ll attach later.

Re: Interpolating 2D array

altenbach — Mon, 20 Apr 2020 05:00:50 GMT

@HoloYolo wrote:

Screenshots of program and file I`ll attach later.

OK, we'll wait for that then. 😉

(We prefer VIs over screenshots though. We cannot run or debug pictures...)

Re: Interpolating 2D array

GerdW — Mon, 20 Apr 2020 06:30:08 GMT

Hi Yolo,

@HoloYolo wrote:

When I use block "Read from file",data source correctly reading only in type 'STRING' whithout losing signs after dimentional point. … when I use DBL format,it shows just first sing in array.

Then you also need to read the help for the FileRead functions.

Maybe you should use ReadDelimitedFile instead of "Read from file" with some proper format codes and delimiter char as inputs?

Re: Interpolating 2D array

HoloYolo — Mon, 20 Apr 2020 16:12:50 GMT

So that`s it. I need to do automatic interpolate between this two files and create new,as I`ve read eralier.

But I cant attach here TXT files to interpolate it :(. It looks like this. Maybe you know,that it is Touchstone file for different currents.

I can share TXT files in other source If it possible for you

Re: Interpolating 2D array

GerdW — Mon, 20 Apr 2020 18:21:10 GMT

Hi Yolo,

@HoloYolo wrote:

But I cant attach here TXT files to interpolate it :(. It looks like this. Maybe you know,that it is Touchstone file for different currents.

I can share TXT files in other source If it possible for you

You can attach TXT files here in the forum. In case of trouble you can also ZIP all files into just one ZIP file!

You also should use filenames with just English chars as "standard" Windows applications often have problems with Unicode filenames…

You also should simplify your block diagram:

Re: Interpolating 2D array

HoloYolo — Mon, 20 Apr 2020 18:17:07 GMT

That`s it. Thank you

Re: Interpolating 2D array

GerdW — Mon, 20 Apr 2020 18:25:56 GMT

Hi Yolo,

when you are asked to provide a ZIP files, then you should attach a ZIP file. A RAR file apparently is not a ZIP file! (ZIP files can be handled by Windows while you need an additional proprietary application to handle RAR files! Not everybody will or can do this…)

Why are you naming those files as "LVM": they are simple CSV files (using a TAB as delimiter), so yoou should call them TXT or CSV…

@HoloYolo wrote:

I need to do automatic interpolate between this two files and create new,as I`ve read eralier.

How do you want to interpolate "between files"?

Re: Interpolating 2D array

HoloYolo — Mon, 20 Apr 2020 18:37:15 GMT

Is there any difference in LabView if i`ll just change expansion of this files?

I need to interpolate between two adjacent coloumns in final array which was created from this 2 files as it shown on block diagramm. So I think to use block 2D interpolate,but I laso have know ideas how to realize this in it,also because of wrong reading Interpolating block of data this files.

Re: Interpolating 2D array

HoloYolo — Mon, 20 Apr 2020 18:39:52 GMT

So,is it possible to do DBL paramater in reading block,without losing signs after delimetr point?

Re: Interpolating 2D array

Frozen — Mon, 20 Apr 2020 19:26:50 GMT

so what you have there is a tab separated text file.

Use the the appropriate read file utility to get a 2D array.

Re: Interpolating 2D array

HoloYolo — Mon, 20 Apr 2020 21:04:48 GMT

You mean to create a file path constant,but how it will be piossible to change file on front panel? Or I missunderstand smth

Re: Interpolating 2D array

HoloYolo — Mon, 20 Apr 2020 21:41:53 GMT

Could you share .vi file please,if It`s possible

What am I doing wrong?

Re: Interpolating 2D array

Frozen — Mon, 20 Apr 2020 22:23:24 GMT

No idea what you are doing wrong...

Perform the following steps:

- Place the "Read Delimited Spreadsheet" vi on a block diagram

- right-click the "all rows" output and create indicator

- run the vi.

You might have the double display-formatted incorrectly?

Re: Interpolating 2D array

HoloYolo — Mon, 20 Apr 2020 23:19:02 GMT

So,thank you. I`ve already solved this porblem,it was because of global parameters of decimal on my computer.I`ve change this on dot and It works correctly now. Excuse me for my slowpoke in this question.

Then. I`ll have no ideas how to interpolate between this two arrays to find new S-parameters for new current.

Re: Interpolating 2D array

GerdW — Tue, 21 Apr 2020 05:29:56 GMT

Hi Yolo,

@HoloYolo wrote:

I need to interpolate between two adjacent coloumns in final array which was created from this 2 files as it shown on block diagramm.

I`ll have no ideas how to interpolate between this two arrays to find new S-parameters for new current.

How do you want to interpolate between these two columns?

Do you need just the mean of each pair of columns: then you don't need any interpolation function!

When you really want to interpolate: which parameter decides the interpolation point (aka x value)?

Re: Interpolating 2D array

HoloYolo — Tue, 21 Apr 2020 16:39:25 GMT

As I`ve written earlier I have 2 files with S-parameters for given frequencies for 2 currents-2 mA and 5 mA. I think to use 2D Inerpolate block in LabView to do it,to interpolate between this 2 parametrs for current,for example to make outpur parameters for 2.5mA. But I don`t know how exactly It can be realized,Interpolate doesn`t work. For Z-value is combined data from 2 files,for X-frequencies from file and for Y-current 2-5.

Re: Interpolating 2D array

GerdW — Tue, 21 Apr 2020 18:47:09 GMT

Hi Yolo,

did you notice my comments on using real ZIP files and "only English" filenames?

Suggestion:

Re: Interpolating 2D array

HoloYolo — Wed, 22 Apr 2020 21:05:51 GMT

Oh,thank you so much for help,I`ll test this block and tell you how it is.

I`m sorry I forgot about english files and ZIP,in the future will attach with it.

I just think that visualy this interpolation looks like this,so I thought to use 2D interpolation.

For example,what should I do,if i have more files:for 10,15 mA and I want to interpolate for whole range,from 2 to 15 mA. I need to expand loop block with more arrays?

Re: Interpolating 2D array

HoloYolo — Wed, 22 Apr 2020 21:24:29 GMT

I`d like to know,how is it function nammed and what does this function perform?

Re: Interpolating 2D array

Frozen — Wed, 22 Apr 2020 22:44:28 GMT

As the name suggest, it builds a cluster array.