Find a value in a boolean array

Hey I have a boolean array with 500,000 values and I need to find the only one thats true. Is there an easy way to find this value?
Thanks

altenbach wrote:
So far we assumed that you have a 1D array (you did not say!)
(In the more general case, this idea would help too, but it does not seem to get a lot of love. Only 16 kudos )
I'm sorry it's a 2D array.

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1d cluster array replace value in a 1d boolean array (without using Loop)

Hi ,
is there a way to replace the values (string , boolean) of a 1D array Cluster with value of 1D boolean array without using loop ?
Regards
Simone
Attachments:
111.png ‏75 KB

Replace Array Subset requires that the array elements are type compatible with the elements that you want to replace. That seems not the case in your example.
And the For Loop is anything but slow. How many billion elements do you expect your array to have to worry about performance of the for loop? With the type definition of your example even a ready made LabVIEW function would have to do internally a for loop too, since the boolean data inside the original array can not be in a continous memory area.
Maybe if you show us what you try to do with the for loop we can understand better what your concerns are. As it is from the front panel image alone it is really hard to understand what your imagined problem might be.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

How to find the nearlest value in 1-D array ?

Hi.. everybody..
I need to seperate the raw data(1-D) into 2 group of array by the center value and then make the average value in each array. But I also still have the problem about if the center value is not the same of some value in the 1-D array. I cannot use the split function.
"How to find the nearlest value to the center point that I calculated, in the 1-D array ?"
Thanks a lot for anybody help

In a general sense, since I'm not sure what your data values are or how far away your calculated center is from the true value, I would do it one of two ways:
1) Use a threshold value and scan the array until the threshold is reached (assumes constantly increasing values in the array).
2) Use either a) round to nearest integer b) round to + Infinity (round up) or c) round to - infinity (round down). If you don't have decimal values, you'll have to devide the values by a power of 10.
2006 Ultimate LabVIEW G-eek.

How to assign values for boolean array in LabVIEW?

I want assign values for boolean array.Iam not able to do that.For each boolen i want to assign each value.Plz help me......
Please Mark the solution as accepted if your problem is solved and donate kudoes
Solved!
Go to Solution.

Hi agar,
values in an array are "assigned" by building an array (using BuildArray) or by replacing values in an existing array (ReplaceArraySubset)!
Good starting point could be this...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

How to find closest value in array?

Hello all,
I just want to find the closest value from the string array. Which I attached herer as a image.
Now, If I want to find value 350 from string array and if it is not in array then in output array there should be display closest value of 350..
Thank You for support
Vinal Gandhi
Kudos are always Welcome.... :-)
Vinal Gandhi, CLD
Software Engineer
Solved!
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Attachments:
untitled.PNG ‏2 KB

Hi Vinal G,
something like the attached comes to my mind.
Hope it helps
Mike
Message Edited by MikeS81 on 05-12-2010 09:31 AM
Attachments:
Closest2Target.PNG ‏8 KB

How can I add a True value to position (0,1) in a 2*2 boolean array?

Hi everyone, let's say I have a 2*2 boolean array (Indicator), how can I let the element in position (0,1) for example be true??
Thanks.
T. A.
Solved!
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Hi T.A.,
1) ReplaceArraySubset with indices 0&1 and element=TRUE.
2) OR Array with an array constant of [(F,T),(F,F)]
Message Edited by GerdW on 11-23-2009 03:22 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Element position in boolean array

Hi,
I have a boolean array, whose elements are initialized to false. For example,
private boolean array[] = new boolean[10];Later on I set an element of the array to true. Let's say
array[5] = true;My question is how can I get the integer position of the element whose value(s) is/are true? Is there a method that does this? I looked into Arrays class but couldn't find anything.
Thanks in advance.

blias wrote:
I have a boolean array, whose elements are initialized to false...
My question is how can I get the integer position of the element whose value(s) is/are true? Is there a method that does this? I looked into Arrays class but couldn't find anything.You might want to have a look at [url http://download.oracle.com/javase/6/docs/api/java/util/BitSet.html]BitSet. It has loads of stuff for doing anything your heart desires for a bunch of bits, including Boolean operations on combinations and what you want.
Winston

NSArray for boolean array, define size...

Hi!
I have a Class that I'm trying to create...
The class have a boolean array that I define the size when the class initialize...
I put an NSArray in the .h file and I try to define the size of the array on initialisation based on a formula with the parameters for the init method.
I'm so new to Objective-C, I try to do that the same way I did it in C#..:S
What should I do?
Where Can I find information about class definition and sample with int or bool array?
Thanks!
Fred

ShrimpBoyTheQuick wrote:
Hi!
I think I understand something here..
In C, I cannot put an unsized array in the .H file and set the size in the init method in the .m file...
Kinda true, but you can dynamically allocate memory at runtime to hold an array of whatever size you want.
What I can do is....
Define a pointer and a size in the .h file...
Create an array of the good size in the .m file and put the memory address of the array in the pointer and use this array with the pointer and the size value...
I don't think the code you posted will work right. I believe the "roomArray" that you're creating inside "initWithWidth" is a local variable that will go away once you exit the "initWithWidth" method. So even though you've stored a pointer to it in "arrayPtr" ultimately you'll be pointing at garbage once that memory gets reclaimed and reused by the runtime system.
What's my problem after this is how do I tell the object to not used the memory of this array after the method is finished?
Take a look at this discussion of dynamically allocated arrays in C. Basically you'll use malloc() to allocate memory for your array and then later use free() when you no longer need the array. And since you're dealing with width and height you're needing a two dimensional array which becomes somewhat messier.
Steve

!!!Urgent: Boolean array to number!!!

I am trying to convert boolean array to number but I guess it has some limits. I have a boolean array containing 50 elements I want to convert that into number but it is not happening can anyone help. Its urgent.
The best solution is the one you find it by yourself

In a hurry I missed it. Let me explain now
1. I tried to convert a boolean array to a number as I had more than 40 elements I was getting only zero because of the limitation of I32 I know that I have to change the representation to 64bit but dont know where to do.
2. Then in the Boolean array to number function when I select the properties there I got the option for changing the representation to 64 bit. (This I totally missed when I was busy searchng a function outside to convert the output to a 64 bit value )
3. Now I got what I expected.
altenbach wrote:
I don't understand what that means. Could you be a little bit more clear so others can learn too? Thanks!
Thanks altenbach for asking.
The best solution is the one you find it by yourself

Number of 1s or 0s from a boolean array

How to find the number of 1s or 0s from a boolean array. e.g. in 101011, there are four 1s and two 0s.
Solved!
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ABBPAK ha scritto:
Hi,
When you talk about the value change, how to predefine the first value and the last value. e.g. 1100011. here just twice a time value changes but there are four 1s and three 0s.
thanks
Did you focus on the word "sort"?
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My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

Parsing a string to a boolean array

I got to pase a string to a boolean array, this code works for me, but I don't like it. Here Is
public static boolean[] NumeroToBoolArray( int Numero )
//Here I got the number in Binary Format, then reverse it
String temp = new StringBuffer(Integer.toBinaryString(Numero)).reverse().toString();
//Now I create a boolean array of temp.length
boolean[] data_bool = new boolean[temp.length()];
for (int pp = 0; pp < data_bool.length ; pp++)
//And now assign the value to data_bool
data_bool[pp] = String.valueOf(Character.digit(temp.charAt(pp), 10)).equalsIgnoreCase("1");
return data_bool;
Any idea or replacement for this function?
Thanks

data_bool[pp] = String.valueOf(Character.digit(temp.charAt(pp),10)).equalsIgnoreCase("1");becomes
data_bool[pp] = temp.charAt(pp) == '1';

How to address an cell in a boolean array

Hello
I am intersted in addessing a certain cell in a boolean array.
Suppose I have a boolean array called bArr which is of length 10 and contains values of { T,T,F,F,F,F,T,F,T,F }
and I want to send to an "AND" gate bArr[0] together with "TRUE" constant.
How do I address the cell bArr[0] or any other cell in bArr ???
Lavi
P.S: I am using LabVIEW 8.0

Hi Lavi,
You could ve easily given me 5 stars atleast !
- Partha
LabVIEW - Wires that catch bugs!

Store boolean array as text file

Hi there
I'm having some trouble storinge a 25x25 2D array of booleans in a text file.
First I make the 2D array a 1D array, and then I change it to a number, but here something already goes wrong, not the full number is stored, presumably because the array is this big?
Any help will be much appreciated!
Solved!
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Attachments:
Store 2D boolean array LV10.vi ‏17 KB

You can also convert the 2D boolean array into 1D array of numbers and save to text file and then read back to load the original 2D Boolean array
The best solution is the one you find it by yourself
Attachments:
2D Boolean to String.vi ‏16 KB

Control caption names for elements of a boolean array

Howdy, folks
I'm trying to control the caption names for each element of a boolean array. Can't seem to find the appropriate property node which will index each element to each element in the FOR loop. Please see the attached.
Sure appreciate the help,
Hunter

Creating a text array lined up next to it is of course the simplest solution. If the labels are always fixed, you could just use plain label test on the front panel.
Here's an example how you can change the labels inside an array of cluster as I mentioned above. (LabVIEW 7.1).
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Selector.vi ‏34 KB

Draw arc in a boolean array

Hello everyone
I want to extract the coordinate of an arc and use them to draw the same arc in a 2D boolean array, I have the start point coordinates, the end point coordinates, the center coordinates and the radius value.
the result should be like this picture
Thank you

Thank you so much Alex
I was trying to do it with picture functions for 2 days till now xD but I've forgotten the unflatten pixmap.vi
thanks for your help

Find a value in a boolean array

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