ImageInterpolate Bug? Help

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Hi Everyone,

I was following this node as this Igor user was doing something similar to what I was doing.

http://www.igorexchange.com/node/2366

I type this into the command line
ImageInterpolate/S={xmin, dx, xmax, ymin,dy,ymax} voronoi tripletWave


and I get an error. (Incidentily the same error as the Fortress from the old thread "Use '/N=number' or '/N=(expression)' (assuming flag 'N'). If multiple dimensions used (i.e., Make/N), use /N=(n1,n2...)")

I tried putting the S parameters in parenthesis as hrodstein suggested but still isn't working. If anyone can help me that would be wonderful!

Thanks for any help =)

Best,
N

PS i'm using Igor Pro 6.37 on Windows 7
Since you are typing on the command line, all of the variables must be globals.

Print them out with:

Print xmin, dx, xmax, ymin,dy,ymax


That should tell you if the variables are actually defined globally (as would the Data Browser).

--Jim Prouty
Software Engineer, WaveMetrics, Inc.

August 17, 2015 at 10:55 am - Permalink

Thanks for your reply Jim,

I was under the impression that only Global variables show up on the data browser? (that's why when I write a new function I have everything as a global variable for debugging purposes).

I printed them and they all showed up.

Is it because they are global variables that I am having a problem?

I wrote a simple function with the command and I think it worked, well i got an image (but it looks a bit odd but that might be my data). But I would really like to know why it isn't working on the command line. Any ideas?

Thanks,
N

August 17, 2015 at 11:17 am - Permalink

In Addition to this,

I have been looking at the 2D wave ImageInterpolate produces and I'm not entirely sure it's done what I was hoping it would do.

The Z values don't appear to be matched up with the x and y coordinates very well. There seems to be gaps in the table. Is there a better way to do this?

Thanks,

N

August 17, 2015 at 11:50 am - Permalink

n.black wrote:

I have been looking at the 2D wave ImageInterpolate produces and I'm not entirely sure it's done what I was hoping it would do.


Please elaborate; we have no idea what you were hoping.

Quote:

The Z values don't appear to be matched up with the x and y coordinates very well. There seems to be gaps in the table. Is there a better way to do this?


I'm not sure what "table" you have in mind.

If you have a triplet wave and the interpolated image you can display them both in Gizmo. First display the triplet wave as a scatter object and then append the image as a surface. You can find example of this in the video tutorials http://www.wavemetrics.com/products/igorpro/videotutorials.htm.

You might also want to try ImageFromXYZ.

A.G.
WaveMetrics, Inc.

August 17, 2015 at 01:04 pm - Permalink

Thanks for the reply A.G.

Let me elaborate I was hoping to turn my three 1D waves X,Y,Z where the X and Y waves are location waves of the Z wave (eg intensity) thus making a 2D matrix of z values that have been appropriately placed. I ultimately want to make a 2D image plot of this z matrix. (The X,Y waves are locations on a square grid).

I already watched the video tutorial (and the 3D image help guide), which was why I decided to try and achieve my goal this that way. I understand that for some data calculation reason there might be gaps around the edges of the table of the 2D z matrix data at least in the tutorial example, but my data should match up nicely. Moreover, when i tried to find pt (0,0,0) on the table the first data value of my z wave wasn't there. I'm not very efficient at code writing (in every sense of the word efficient unfortunately) so I was hoping that IGOR had a built in function which would saving me time.

But I'll try the image form XYZ approach and see where I get for the time being! =)

Thanks for your help,

N

August 18, 2015 at 01:55 am - Permalink

n.black wrote:
I ultimately want to make a 2D image plot of this z matrix. (The X,Y waves are locations on a square grid).


If the data are already sampled on a rectangular grid it is counter productive to use ImageInterpolate Voronoi. Instead, check if you can rearrange the data, for example, if the data were sampled in order you could use:
 Redimension/N=(rows,cols) datawave

If the data are not sampled in order then I'd recommend either sorting or using ImageFromXYZ.

August 18, 2015 at 10:41 am - Permalink

Thanks Igor,

Sorry for late reply, but your advice really solved my problem.
Unfortunately my data was all "higgilty piggilty" which was why I was over complicating matters.

Thanks for all your help!

Best wishes,
N

August 20, 2015 at 01:55 am - Permalink