change x value

[marten]

I get 400 samples ... with different values........ To change them in the amplitude is now problem but..

time based it isn't possible, i try to move it to 1500 (now 0) and stretch is zo it's not from 0 til 400 but from 1500 til 2000?

I've tried alot from the signal processing pallete but it all changes the amplitude and not the x...

Who can help??

[tbd]

hi martin,

      Are you plotting data on a Graph or Chart?  How about attaching a simple VI along with some data.

Cheers! 

[marten]

 Okeej,

The attached vi reads the trace date that is in file moi (witch is also attached)...

What i want to do is that the trace starts at 150000 (khz) and stops at 110(MHz) instead of starting at 0 and stopping at 400....

[GerdW]

Hi Marten,

it seems to me you only saved the y-values of your data in the moi-file.
To show the correct x-scale you have to provide x- and y-values! So save your data as 2d-array and build up an xy-graph from your data.
See the example to learn about xy-graphs!

[Dennis_Knutson]

At the very least, you have to save the start frequency and increment in the data file along with the Y data. When you read the start and increment from the file, then you can write these to the a graph's offset and multiplier with a property node.

Saving the x axis as an array will also work as Gerd mentioned.

Message Edited by Dennis Knutson on 03-02-2007 07:44 AM

[altenbach]

Well, a waveform always has dt as X-axis, and you want Hz. Assuming that your file has no useful timestamps (currently its t0=0 and dt=1), it seems only the Y array is good data.

(You are probably aware that 150000kHz is larger than 110MHz. I assume you meant 150000Hz. Right?)

Just strip out your Y array from the waveform and set x0 and dx manually for the display using a property node (x0=150000, dx=110M-15000/(N-1)). Tweak as needed.

Of course you now should label the Axis Hz.

Message Edited by altenbach on 03-02-2007 06:51 AM

[altenbach]

Of course you probably noticed that I subtract wrong. Please swap the inputs to the minus. 😉

Message Edited by altenbach on 03-02-2007 07:01 AM