How many elements in an array?

Sounds like a simple question, right?
Apparently not.
LV 2010
I have a huge data structure, stored in DataLog files (thousands of them).
I want to convert this structure to Name/Value pairs ("Operator_Name", "Joe Smith"), for use in a TDMS file.
The structure is a cluster, with various clusters inside that, and inside those are DBLs, strings, BOOLs, other clusters, arrays, you name it.
My strategy is to obtain the CONTROLS[ ] property of the outermost cluster and call this VI.
The VI processes each control, decoding what type it is and handling it accordingly.
It works fine for STRINGs, NUMERICs, ENUMs, BOOLEANs, COMBOBOXes, TIMESTAMPS, and CLUSTERs.
For those simple ones, I use the LABEL.TEXT as the NAME and get the value (based on what type it is) as the VALUE.
For a CLUSTER, I get the CONTROLS[ ] array of the cluster and call myself recursively, to handle all the elements within the sub-cluster.
That all works fine.
But to handle an ARRAY, I'm stumped.
Attached is the code showing the case for an ARRAY.
What I'm doing is getting the CLASS NAME of the current control.
I LEGALIZE the label name (turn spaces into underscores, and maybe other special handling later).
For an ARRAY, I cast the generic CTL reference into an ARRAY reference, and get its VALUE.
I want to loop over each element of the array, and modify the name by the index number, and process each element.
There are arrays of STRINGS, arrays of DBLs, arrays of CLUSTERs - all types.
The question is - how many array elements are there?
The constant "10" in this diagram is a dummy - just there to see if it works.
it does work, except that I get 10 sets of answers, whether the real array has 2 or 20 elements.
I thought the array's VALUE would be an ARRAY of VARIANTs, but no - it's a single VARIANT.
I can't use VARIANT to DATA on the array's VALUE - I don't know what TYPE the array is.
I thought maybe the ARRELEM refnum would be NIL if I was past the end, but that's not the case - there's only one refnum for any array element, whether it exists or not.
If I check for errors, it complains that I cannot set the INDEXVALS property of a strict typedef array, even though it works just fine.
If there was a method to SELECT ALL on the array, I could use the SELECTION SIZE to figure out how many elements there are, but I see no such method.
The NUMBER OF ROWS / COLUMNS refers to the number of VISIBLE rows/columns, and has nothing to do with how much data is present.
So... How do I find out how many elements are in the array?
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

The ArrElem reference property is not a reference to any particular element of the array.
On the contrary, it is a reference to the element addressed by the current ARRAY INDEX(es).
That's why my code above can read out the values for element 0, element 1, etc. I've verified that this works.
There is only one set of PROPERTIES for the array elements; if you use the ArrElem refnum to set a background color of blue, then ALL elements turn blue, but you can obtain the VALUE of a given element by setting the ARRAY INDEX(es) and accessing via the ArrElem.
I was thinking that maybe LabVIEW did a trick by setting this to NIL to indicate "no such element", but that's not the case.
In any case, the question remains: How do I determine how many elements there are?
The VALUE of the array is a variant: just what is in that package?
As I said, I don't see how to use VARIANT TO DATA; I don't know what kind of data it is.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

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How many elements can ...

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I linux inode which contains 13 member array wich stores the actual block address of data .Similarly in windows how data is managed in disk ?. How many members in this array ?

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How many elements can I insert into a form?

When creating my form I received a notice that I had reached the maximum number of elements for my form! I was near the end stages of my design, Ouch!
What can I do? Is it possible to cut and past sections of my form to create a new form(s) and link it all together?

I am limited to the amount of check box elements I can insert into a form by Adobe Forms Central.
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How to average each element in an array

I have data from a Gage Card that I would like to average. I am tuning a laser over a 50 mA range and for each 1mA increment in current, I am taking 100 scans. Each scan consisting of about 200 points. I cannot average more than 10 shots using the Gagecard so I would like to capture 100 scans, and average them to reduce noise. Currently, I have my capture vi inside of a for loop which repeats 100 times and each scan writes to a file, but I would like ony 1 scan (the lower noise averaged one) per current increment.
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It sounds like you want to average element 0 across 100 arrays and make that element 0 of the new averaged array. Then average element 1 across 100 arrays and make that element 1 of the new array ... ?????
How are you working with your 100 1-D arrays now?
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Message Edited by Ravens Fan on 01-21-2008 04:26 PM
Attachments:
Example_BD.png ‏6 KB

Number of elements in an array

Hi,
I have been trying looking for a simple function to get number of elements is an array. Have gone though older posts but could not find answer to it.
The function should work for following examples:
char* name = "nInstruments"
float state[] = {1.0, 2.0}
I tried sizeof but it returns size of "type" in bytes. For example in example 2, it will just return 4.
Does someone know a way to do it?
Ciao
RB
Solved!
Go to Solution.

RB,
In C, if an array is declared on the heap, as opposed to on the stack as in your example above, the sizeof operator only returns the length of the pointer that holds the array which, in a 32-bit program, is always 4 bytes. This is because the compiler has no way of knowing how many elements that array actually holds. The length of a C array is a fairly fluid concept. The real size of the array is usually determined by some memory manager somewhere (usually, malloc), but it's not something that the language itself has anything to say about.
When you declare the entire array as a local variable, however, the compiler must create room for the full array on the stack, and therefore it is able to return the true size of the array via the sizeof operator. (The same is true if it's a global variable, even if it's not on the stack, in that case)
For this reason, using the sizeof(array) / sizeof(array[0]) trick is iffy. It might work, or it might not work, depending on how the array is declared.
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How do I extract the length of an element in an Array List

Hello there,
I am facing this problem with an Array List of elements. I am trying to extract the individual length of a particular element in the array list . Now if I know the element is a String is this valid?
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Snap!I don't know how many times I've seen people post
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� {�

How Do I Print the Number of Elements in An Array

How do I print: "There are ____ number of elements in the array?"

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Count how many time we have each element

I can't count how many the same element is on my array, I have an array [21, 12, 4, 21, 21, 4]
I expect to have something like this:
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below is the code
System.out.printf("%10s,%10s \n", "number exist", "number");
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          System.out.printf("%10s,%10s \n",v,list.get(i));
Edited by: ronisto on 11-Mar-2008 1:34 PM
Edited by: ronisto on 11-Mar-2008 1:39 PM

good actually I 'm using a List, I could'nt find where is wrong, I can print for the first one, but if I try to use the for it' s not working...look the code below with a list like this [5 , 1, 7, 1, 1, 5]
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               for(j = 0; j < list.size(); j++){
                         if (list.get(j) == list.get(0))
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               System.out.printf("%10s,%10s \n",v,list.get(0));
result give me:
Column1 Column1
3 1
til here is good but when I try to print samething for all elements of my list it doesn't work
System.out.printf("%10s,%10s \n", "number exist", "number");
               for (i = 0; i < list.size(); i++){
                    for(j = 0; j < list.size(); j++){
                         if (list.get(j) == list.get(i))
                              v++;
               System.out.printf("%10s,%10s \n",v,list.get(i));
Edited by: ronisto on 11-Mar-2008 6:04 PM

Is how can I calculate how many transitions are inside an array?

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Solved!
Go to Solution.

If you only care about actual transitions and not the type of them, I'm a fan of the simple XOR.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Attachments:
Count Transitions.png ‏19 KB

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