Sort an element out of 2-D array

Hi guys, how to sort an element out of a 2-D array. For example I like to know the value of element in array[0][1].
Solved!
Go to Solution.

The index array function would be a good start.
Have you even tried it?

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How do I convert a 1-D array of cluster of 5 elements into a 2-D array of numbers? (history data from a chart)

Hello,
in my vi I have a chart with 5 Plots displaying measurement data.
The user should be able to save all the history data from the chart at anytime. (e.g. the user watches the chart and some event happens, then he presses a "save"-button)
I know, that I can read out the history data with a property node. That is not the problem. The problem is, how do I handle the data? The type of the history data is a 1-D array of cluster of 5 elements.
I have to convert that data somehow into a 2 D-array of numbers or strings, so that I can easily save it in a text-file.
How do I convert a 1-D array of cluster of 5 elements into a 2-D array of numbers?
I use LabVIEW 7.1
Johannes
Greetings Johannes
Using LabVIEW 7.1 and 2009 recently
Solved!
Go to Solution.

Gerd,
thank you for the quick response and the easy solution.
Look what I did in the meantime. I solved the problem too, but muuuch more complicate :-)
And I have converted the numbers to strings, so that I can easily write them into a spreasheet file.
Johannes
Message Edited by johanneshoer on 04-28-2009 10:39 AM
Greetings Johannes
Using LabVIEW 7.1 and 2009 recently
Attachments:
SaveChartHistory.JPG ‏57 KB
SaveChartHistory.JPG ‏57 KB

Determining if element is in a certain array

Hi,
I was wondering if there is a way to determine if a String element is part of an array of Strings. In other words, I want to do something like:
String myString = "blah";
String[] stringArray = {"blah", "foo"};
if (myString is part of stringArray) {
// Do stuff here
}The reason I want to do this is because I have two large String arrays, and want to determine if a String element is in one array or the other, and do some stuff based on the result.
Is there a way to do this? If so, how? Could I use compareTo, or something like that, to determine if it is part of an array?
Thanks,
Dan

Use java.util.Arrays.binarySearch(stringArray, myString) if the array is sorted, or use a more high-powered collection class instead (such as a java.util.ArrayList, and the methods it provides to search within).
http://java.sun.com/j2se/1.5.0/docs/api/index.html

How to display last element in a dynamic 1d array

hi..
i want to display the value of last element in a 1d dynamic array.../ i mean ..if i stop the vi run, i need to display the last element in the array..how can i do this?
and is there any way to use a button to start the vi...instead of using the Run button on the vi front panel??
Solved!
Go to Solution.

Index array!. Use array size to determine the size of your array, subtract 1, feed that in the index terminal of Index Array.
You have to start the VI running somehow. It could be set to run when opened. Assuming what you want is a means to type values into a front panel, hit a GO button that you created on the front panel, then have the real part of the VI execute. You could use an event structure. Or put a while loop at the beginning with a small wait statement in side that basically just polls the GO button. When that button is pressed, the true boolean stops the while loop and allows the program to proceed to the main body of your program.

Set number of elements in a two dimensional array

Hi,
Does anyone know how to set the number of elements in a two dimensional array directly in teststand.
To set a one dimsional array is simple:
SetNumElements( locals.somearray,4)
Is there a method to do this for a two dimensional array?
Sean

From the help file (TestStand 4.2.0):
PropertyObject.SetNumElements
SetNumElements Method
Syntax
PropertyObject.SetNumElements ( numElements, options = 0)
Purpose
Sets the number of elements of a single dimensional array.
Remarks
This method is only valid for single dimensional arrays. The elements in the array retain their values. Use the PropertyObjectType.ArrayDimensions property to set the number of elements in each dimension of a multi-dimensional array.
Parameters
numElements As Long
[In] New number of elements for the array.
options As Long
[In] Pass 0 to specify the default behavior, or pass one or more PropertyOptions constants. Use the bitwise-OR operator to specify multiple options.
This parameter has a default value of 0.
So you could use, for example: Locals.MultidimensionalArray.Type.ArrayDimensions.SetBounds({1,0},{3,4}) to set an array to have three dimensions (1,2,3), each with five elements (0,1,2,3,4).

My MACBOOK PRO NEVER LETS ME OPEN AUTOTRADER AND WHEN I TRY TO OPEN IT GETS FROZEN AND IT FREEZES OTHER WINDOWS AS WELL. Please help me to sort this problem out asap. Thanks

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To prevent this being accidentally activated in the future go to SystemPreferences>Keyboard>Keyboard Shortcuts>Universal Access and uncheck all the boxes.

Does any body know how to replace a chunk of elements in a 2-D array

I have a vi that I am working on that needs to be able to replace a lot of elements and I would like to replace them all with 1 operation. thanks in advance vivi

I you want to replace a "rectangle" inside a 2D array, you can wire a 2D array into the element input of the Replace Array Subset. In that case, the index you wire into the function will specify where you start the replacing.
Try to take over the world!

Sort a Set by entries of an Array

Hi,
I'm stuck here. I want to sort a Set by entries of an Array.
For example:
// Set of persons (Person has a country getter-method)
Set persons = getPersons();
// Array of Strings
String[] countrys = getCountrys();
// here I want to sort the set of persons by country name
???What is the right way to go?
Thanks
Jonny

It sounds like you'll want to write a custom Comparator...
The Java� Tutorial - Object Ordering
Making Java Objects Comparable

In Iphoto my manually sort is grayed out. I am unable to rearrange my photos. Any suggestions??

In IPhoto (Events), my "manually sort" is grayed out. I am unable to rearrange my photos. Any suggestions??

Hello Terence,
Okay I will try reformating the camera's card. However all is well when I export photos to my iMac at home or onto my iPad.
If your suggestion does not work should I try reinstalling iPhoto from the iLife disk? If so, how do I go about doing that or is there a website somewhere explaining this?
Regards,
Tom

Sort Second Element in Array of Strict Type Def Clusters

I need to sort the an array of strict type def clusters by the second or third element in the cluster. In the past I have used 1-D array sort and sorted by the first element of the cluster. When I need to sort by the second, third, or fourth element of the cluster I just break down the cluster and rebuild it placing the desired sort element in the first position of the new cluster. This works for simple tasks and clusters, but as the cluster gets more complicated this becomes a pain to do this. There must be a cleaner way to sort by other elements within the original array of strict type def clusters. Has anyone succeeded in doing this a different way?

Hello,
Here's the way I would do it...just create a new cluster array, where each cluster contains two elements...the unbundled item you want to sort by, and the cluster itself. Then sort the new cluster array, then unbundle the sorted cluster array to get the original clusters (now sorted). Here is a screenshot:
There may be a better way, but this is the first thing I thought of.
-D
Message Edited by Darren on 03-16-200610:00 AM
Darren Nattinger, CLA
LabVIEW Artisan and Nugget Penman
Attachments:
Sorted_cluster.jpg ‏30 KB

Nested IPE (In Place Element) usage when accessing Cluster/Array data via DVR

I am sharing data across several VIs and loops via a DVR, and accessing the data via a DVR IPE. The data is a cluster of arrays. The diagram below (VI attached) illustrates the structures invloved, but not the structure of the application.
(The diagram above does not include initialization of the arrays, as it is intended only to illustrate the Cluster1 data type. Array lengths could be 100.)
The DVR (DVR1) is passed to multiple VIs of the application at startup.
Each VI executes loops that either read or write particular elements of each array (fArray1 or fArray2).
I believe the DVR IPE (B1-DVR) provides blocking so that only one task can modify the data (Cluster1) at any time.
Case 1 illustrates how I currently WRITE to array elements. The outer IPE (block B1) is rolled into a VI (not shown) that takes DVR1, Index, and Value as inputs.
Cases 2 - 4 illustrate 3 additional methods that remove one or both of the inner IPEs (B2-Cluster and B3-Array).
Case 2: IPE B3 (Array Index/Replace Elements) is replaced with a non-IPE 'Replace Array Subset'.'
Case 3: IPE B2 (Unbundle / Bundle Elemnts)' is replaced with a non-IPE cluster 'Unbundle'/'Bundle'.
Case 4: removes both B2 and B3.
I implemented case 1 a long time ago. When I had to do the same thing again recently, I did case 4. When I stumbled across my earlier implementation, I was a bit suprised
Which of the 4 cases should take the least time (or resources) to execute? I think case 4 has as few array allocations as any of the other 3.
The attached image did not capture the Buffer Allocation marks, so I marked the ones that differed with a red "B".
I am only interested in differences in how the arrays are handled, so I see no signioficant differences.
Is this one of those cases where LV doesn't need my help?
Incidently, I recently wrote a small app with shared data and decided to try FGVs to share array data. For small arrays, 10^7 iterations, and an FGV based array-element read followed by a element write, the FGV was faster. 1.2us per read/write for FGV vs 3us per r/w for an DVR/IPE based read/write (like above).
Peter
LV 2011 SP1, Windows 7 64-Bit
Attachments:
IPE.vi ‏9 KB

Option 1 is a definite no and as far as I know it has been NI's explicit intention to steer clear from it. I believe there's an idea in the IE which asks for this.
I agree that option 2 makes sense, but I don't think it should be something the user specifies. Either LV can detect it automatically or it can't, but I doubt NI would let you have an option which creates the possibility for this kind of bug.
I'm not sure, but the mark as modifier option on the IPES might be the option you're looking for. I know that it exists and I know very roughly what it does, but the documentation for it is very limited and I never actually played around with it, as usually I don't need these kinds of optimizations.
You may well be right that a new option on the IPES is desirable and you should probably add it to the idea exchange.
As for NIWeek, I'm not going this year, so I have no idea what kinds of sessions are around, but it's a great place to find people who know what they're talking about and ask them about it directly. Certain people in LV R&D would probably be ideal for this and if you ask relevant people, you might even get their names. I'm sure buying them a beer would also help to loosen their tounges. If you ask me, this type of interaction is the main value of the conference, not the sessions themselves.
Try to take over the world!

RescaleOp elements out of order

I'm using the RescaleOp class to apply translucency to an image as needed.
This class takes an array of floats and uses them to scale the elements of a BufferedImage, like this:
float[] scale = { 1f, 1f, 1f, 0.5f };
However, the elements are not in expected order, and this is causing problems because I can't expect the order to always be consistent, and because I don't know how to programatically check the correct image order.
In one case, I have a buffered image of type TYPE_INT_ARGB.
But RescaleOp treats the elements as RGBA, with the last element influencing the alpha.
I have another image, TYPE_4BYTE_ABGR.
In this case, RescaleOp applies the four scale elements in a different order: RABG.
Just out of curiosity, I changed another image to use 4BYTE_ABGR instead of INT_ARGB, but RescaleOp still treats that image as RGBA.
It seems to be totally unpredictable how its going to apply the elements I give it. It does not match the image type.
How do I determine, programatically, what order it wants to treat the elements?

Nevermind.
Predictably, the case where I changed the image to 4BYTE_ABGR yet RescaleOp treated it the same way was a careless error.
So I can reliably use BufferedImage.getType() to get the image type and the element order.
RescaleOp reorders the elements as 1230, so that ARGB becomes RGBA and ABGR becomes RAGB.
I can't fathom why, and its not in the java doc, but it does so consistently, so I can work with that.
Sorry for posting this question before exploring it further. I would delete it, but I'm writing this on here so that if anyone else runs into the same situation, they'll find it on Google.

Help with elements getting lost in an array.

Hello all. I need a little help figuring something out.
Flash CS3 : AS 1 - 2.
I was messing around with colorTransform and running it
through an array of movie clips and somewhere along the way
elements of my array started getting lost. Meaning, when i started
a " trace (elementArray) " would recognize each element as a
movieclip.
Now when i test only elements 1,2, and 5 are recognized as
clips and the others come up undefined.
Now the only thing i can think of is the difference in the
naming conventions for the mcs (i pulled them from two other
files.). but that shouldnt be an issue. I have checked and double
checked the instance names and they are correct. Any insight into
this would be really appreciated.
Thanks.

Thanks for your offer to help Kglad, but I got it figured
out.
The code works, it was a problem with the movie clips. They
were set to "track as button" so the btnColor_mc clip was not
registering.

How can I remove only the middle elements from a 2-D array?

Hello all!
We have had an issue at my work where some of our graphs featuring a Gaussian curve have an unusual rectangular distortion in the middle of the curve (sorry that I have no image to show you, the error is before my time at the company, and I've been asked to find a solution before it happens again). Basically, what should be a Gaussian curve is leveling off briefly and looking like a rounded square wave. We know what causes the distortion, so I only wish to remove the middle part, giving it the appearance of a Gaussian. It's odd, but it actually offers a good approximation of what we want. The graph is made from a 2-D array of Double values, and we can estimate the size of the leveled-area, so I figured that removing the middle elements from the graph would accomplish this. Does anybody know a way I can accomplish this?
-Gobble
LabView 8.5.1

Raven,
Thank you very much, I'll try that!
-Gobble
LabView 8.5.1

What's going on with ios8... Screen rotate does not work anymore, wifi doesn't work very well anymore and apps are crashing or running slow... Come on Apple sort this mess out

ssince I updated my iPhone 5s to ios8 ive had nothing but problems...
first the the screen rotation is not working... Checked the settings and lock is off.... The wifi is intermittent, some times it works sometimes it doesn't....
the he iPhone is really slow now, like really labouring.... It hangs and crashes all the time.... I have to close apps down completely because they won't work from quick launch anymore.... Even writing this the phone is labouring.... It's like my old 48k spectrum.... I don't expect this from Apple and when you spend £400-500 on a phone you expect it to work and play propperly.... come on Apple you need to sort out this mess of a update.... Ios 7 was no bother......

Same issue here... iphone5S 64GB. It's intermittent. Sometimes the rotation works fine, sometimes it doesn't, but most of the time it doesn't work.
The first time I figured out it wasn't working was when all newly-taken photos and videos were showing up in portrait mode though I always hold in landscape mode when photographing.
Rotation lock is disabled (tried toggling it on and off). Tried recalibrating the compass on a whim, no effect (although my compass seems to always require calibration when it's launched now).
This issue only started happening after upgrading to iOS8. I did a reset/restore through iTunes rather than an OTA upgrade.
UPDATE - power-cycling the phone seems to fix it temporarily.

Sort an element out of 2-D array

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