Number of Elements - What is it?

Hi,
I am trying to ramp up on OBIEE, and I am going through the OBE tutorials.
In creating levels in the dimensional hierarchies, the tutorial has you specify a field called "Number of elements at this level". It doesn't really explain what it's used for, or give guidelines on what to enter for this field. Could someone please explain it a little further? I would really appreciate it!
Thanks,
Kevin

From what I know , it is number of distinct values at that level in physical table.
E.g. at region level it is
select count distinct region from physical table.
Not sure how this information is exactly used by BI server. The number does not have to exact but the ratio has to be approximate.

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Number of Elements at this level --------------( 1 for Dimension Total)' ?

Hi All,
If we check the Dimension Hierarchy Property ..there is option like ‘Number of Elements at this level --------------( 1 for Dimension Total)’
‘Number of Elements at this level --------------( 1 for Dimension Total)’ ? in Dimension Hierarchy
What is the use of it ?

Number of Elements - What is it?

What is the purpose of Number of elements at this level and ..?

Hi,
What is the purpose of Number of elements at this level an how it influences the obi server to optimize the query?
Thanks in advance.

Hello,
Number of elements at this level, specify the number of elements that exist at this logical level.By mentioning this levels we are telling to the BI Server that it is a parent and the next level is a child.
Mark if helps.

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Number of elements at logical level / odbc driver

Hi everyone,
I'm new in BI area and I cannot understand one basic thing.
I study documentation about BI server, exactly chapter about "creating dimensions" and I'm confused about setting "number of elements at logical level"
It looks for me that "number of elements at logical level" is static.
What will be when someone update data in the table and number of elements will be different than number of elements in our logical level?
example:
current column with distinct values:
channel_desc:
direct sales
tele sales
catalog
internet
partners
in this case I set number of elements at logical level 5.
after a while some update data in the table and our column looks (see below)
column after update with distinct values:
channel_desc:
direct sales
tele sales
catalog
internet
partners
others (added value)
Does it mean that I have to change it to current numbers of elements?
I'm sure that this is misunderstanding in my case, but I don't know where?
Second problem which I have:
BI with oracle database is on linux
client software on windows
I can import data from database like sybase or flat files to the physical model, I can view data, but when I create whole model (physical, bussines model and mapping, presentation) and I try access data from "Answers" I have this error:
"Data source name not found and no default driver specified"
regards
Bart

Number of elements is just an indication used by the BI Server (e.g. when generating LOV's in Answers). It won't cause any problems when it doesn't hold the exact number of elements available in the dataset.

Number of elements - Dimensional Hierarchy

Hi,
In a *'Dimensional Hierarchy'*, while creating a new *'Parent level'*, a 'Logical Level' dialogue box prompts for entering *'Number of elements at this Level'*+. What is its significance ?
What is achieved by+ *'Number of elements at this Level'* +?+
Thanks in Advance & Regards,
Deeba

Hi deeba,
Its not mandatory to specify the number of elements in hierarchy....if you wont mention also by default it takes the value of 1.....Above vino gave you the link for explanation.
Hope it helps you...Award points and close the thread.
By,
KK

Number of elements to be defined at logical level

In the Business Model and Mapping layer, dimension >Logical Level >> number of elements at this logical level
I have come across two different version of how to deal with this
First version - From the OBE and the admin server guide it says "The number does
not have to be exact, but ratios of numbers from one logical level to another should be accurate".
Second Version - a question from asked about what defines the number at the level as best practices
To set the number of elements at each level of a dimension, which number would you use?
A. the number of columns in a logical table
B. the number of levels in a dimension
C. the number of dimensions in a business model
D. The number of tables in a physical model
E. the number of distinct rows in physical column
Question is
what is the rule to set the number of elements at this level?
If its been set depending upon the rows in the table . what will happen if the rows gets added every hour ??
Edited by: ZSAM on Jun 8, 2011 7:06 AM
Edited by: ZSAM on Jun 8, 2011 8:22 AM

The ratio between the levels is what is important I believe. BI Server will use this information to determine which aggregate source to use. You should use the number of distinct rows as the value.
You can also right click the hieracny and use "Estimate Levels" to auto-populate the numbers for you.
Paul

Write two functions to find the the number of elements in a linked list?

I am trying to Write two functions to find the the number of elements in a linked list. One method using recursion and One method using a loop...
//The linked List class is Represented here.
public class lp {
public int first;
public lp rest;
public lp(int first1, lp rest1)
first = first1;
rest = rest1;
The program i wrote so far is
import java.util.*;
import linklist.lp;
public class listCount{
//loop function
public static void show_list(lp list)
int counter = 0;
while(list != null)
list = list.rest;
counter++;
System.out.println ("length computed with a loop:" + counter);
//recursive function
public static int recursive_count(lp list)
if (list.first == null)
return 0;
else
return recursive_count(list.rest) + 1;
//main method
public static void main (String args[])
lp list1 = new lp(1, new lp(2, new lp(3, null)));
show_list(list1);
System.out.println("length computed with a recursion:" +
recursive_count(list1));
at the if (list.first == null) line i get the error " incomparable types:
int and <nulltype>" I know this is a beginners error but please
help...What should I do?

byte, char, short, int, long, float, double, and boolean are primitives, not objects. They have no members, you cannot call methods on them, and they cannot be set to or compared with null.

REST to SOAP: Invalid number of elements in URL "/"

Hi,
So having read the great blog series PI Rest Adapter - Don't be afraid by Alexander Bundschuh and I decided to try and set up my first scenario using the REST adapter in the same vain as Working with REST Adapter: A REST to SOAP Scenario in SAP PI/PO .
When I come to test the service from SOAPUI I get a 404 error with the message "Invalid number of elements in URL "/". 3 expected, 0 received."
As you can see it is hitting the correct sender communication channel as the response comes back with the channel name "RESTSenderMyService".
The Channel has been set up as follows:
Input and output format = XML
Channel selection = MyService (The 'Specify Endpoint' flag is ticked)
There is no limit set for the HTTP operation.
Everything else is left unchanged....left as their default values
Also I've tried adding the full URL in SOAPUI in the endpoint field - the attached screenshot shows when I tried moving the /RESTAdapter/MyService into the Resource field.
I've also fiddled with the media type of the payload from text/xml to application/xml.
So the mystery is what does the error message refer to and what are the 3 elements it's expecting?
Thanks in advance.

Hi Peter,
This has happened because you have not defined the values for the url pattern you have defined in the REST sender channel (I am talking about Service resource and id).
Provide them in the resource section and you will get the message through.
eg- /RESTAdapter/MyService/service/resource/id
Thanks,
Vikas Singh

Number of elements in the FP affecting the performance of my application ?

I developed a simple application which consists of aquiring a signal through a channel of a PXI 5102 module and commanding some relays of a SCXI 1161 module.
This application has the following features :
-The user can, at any time, change the configuration of the PXI 5102 module.
-The signal acquired can be saved to a file whenever the user wants.
-Instead of showing the signal acquired through the PXI 5102 channel, the user can load a given file which contains a saved signal.
-The user can increase or decrease the pressure on a line through a VI that commands SCXI 1161 relays.
As you can see, it is a fairly simple application but the problem is that it have been running for a time the fron
t panel crashes. Is it because the high number of elements I have in the front panel ?
To give you more information I tell you that the processes of saving, loading, decreasing and increasing the pressure on the line are event cases of an event structure.
The front panel consists of a tab structure, 20 controls and indicators and a cluster consisting of 9 controls.

No error take place. By crashing I mean that after a period of time the frontpanel control´s response to inputs of the user become so slow that after a short time there´s no response at all.
The problem is that I´ve been dealing with this problem in this aplication for quite a while and although I´ve optimized, I think, its execution time and the way it deals with memory usage this problem persists.
Since most of the operations performed by it depends on inputs by the user I´ve decided to use an event structure to manage them and decided to load the VIs related to them dynamically into memory to somewoh optimize memory usage.
In order to make things more clear to you I´m sending you a zipped file containing pics that completely describe the frontpane
l ad the block diagram of the appliction.
Any help you can give will be deeply appreciated.
PS : I´ve tried to sent the zipped file but awindow appeared notifying me that Developer Exchange is down for maintenance. If you need any more information to clarify what I mean please let me know.
Sincerely,
Giovani Marcelino Nesi
DRV Desenvolvimento e Representação Virtual Ltda.

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.
For this reason, most C APIs that accept or return arrays, will usually also have some method of communicating the length of the array, usually as an additional parameter of some function. Because .NET APIs usually have no need to do this, the C wrapper for a .NET API in CVI does this for you when it handles .NET arrays. For example, here's what a function signature might look like:
int CVIFUNC Namespace1_Class1_Test1DArrays (Namespace1_Class1 __instance, int * inA, int __inALength, char *** outA, int * __outALength, Namespace1_Class2 ** refA, int * __refALength, double ** __returnValue, int * ____returnValueLength, CDotNetHandle * __exception);
Luis

In OBIEE RPD hierarchy,while defining levels Number of elements count?

Whats the importance of NUMBER OF ELEMENTS AT THIS LEVEL (count) while defining the hierarchy level.Does I need to enter the MAXIMUM distinct values of any element in that dimension table.If Yes how will that value gets updated when data in DB changes.Or can I mention depending on level count too like Level 1(1),Level2(2) ...

use search functionality of the forum
Re: Estimate Levels

Reg Number of elements at this level and Variables

Hi Experts,
What is the purpose of Number of elements at this level in the dimensional hierarchy of BMM layer on what basis default it will show 1 if we change this value into 2 what happens .
Difference between non system session variables and dynamic repository variables in which scenarios we will use these bth variables.

Hi Rafi,
Sorry for delay response.
Nonsystem Session Variables :-
The procedure for defining nonsystem session variables is the same as for system session variables.
A common use for nonsystem session variables is setting user filters. For example, we could define a nonsystem variable called SalesRegion that would be initialized to the name of the user’s sales region.
We could then set a security filter for all members of a group that would allow them to view only data pertinent to their region.
2. difference between dynamic repository variables and non-system session variables?
Dynamic Repository Variables:-
We initialize dynamic repository variables in the same way as static variables, but the values are refreshed by data returned from queries. When defining a dynamic repository variable, we will create an initialization block or use a pre-existing one that contains a SQL query. We will also set up a schedule that the Oracle BI Server will follow to execute the query and periodically refresh the value of the variable.
Note: When the value of a dynamic repository variable changes, all cache entries associated with a business model that reference the value of that variable will be purged automatically. Each query can refresh several variables—one variable for each column in the query. We schedule these queries to be executed by the Oracle BI Server.
Hope this help's
Thanks,
Satya

How to convert amount data element to number data element

Dear Gurus,
I have a requirement to get the data by calling BRF+ and then pass them to BAPI 'BAPI_ASSET_ACQUISITION_POST', in the BRF+ export structure, there is a field 'AMOUNT', I bind it to DDIC element 'BF_ANBTR', the type is Number.
In BRF+, I call another global function to calculate the value, I define a local variant LV_VALUE to get export value from this function, this local variant's type is Amount, now I need to move this local variant value to the export field 'AMOUNT'.
But BRF+ doesn't allow to convert amount data element to number data element directly, and I find there is no formula function available. Only there is a function 'TO_AMOUNT' to convert number data element to amount data element.
Please help to get a solution for above solution.
Thanks.

Hi,
within the formula expression within the category "Mathematical functions" you will find the function "TONUMBER". This converts a data element of type currency to a number. According to the help of this function:
"The following conversion rules apply:
<Amount>: The number part is returned. The currency unit is omitted."
This is what you are looking for.
For the other way round you already mentioned the correct function "TO_AMOUNT"
BR
Christian

DMA FIFO number of elements to read mismatch in FPGA and RT

Hi all
I am using myRIO , LV14 to run my application.
Application: I have to continuously acquire data via FPGA and process in RT host once every 2000 samples are collected. I use DMA FIFO (size 8191) to acquire data, use timeout property at the FPGA to eliminate buffer overflow. I had followed cRIOdevguide to implement this part. A snippet of what I have implemented is attached. Whole code runs in SCTL at 50MHz.
Issue: Twice or thrice I encountered with this strange behaviour, that the FPGA FIFO is giving continous timeout and the RT is unable to read the FIFO. The number of elements to write propery in FPGA VI gives 0 showing that FIFO is full and no more can be written, but at the RT, elements remaining is giving 0, hence it is reading 0 (no) elements.
Workaround: I put a case where I will write to FIFO (as per the code) and if the number of elements to write is nonzero. It seems to work fine, as of now.
What confuses me is that my FPGA VI says that FIFO is full (FIFO number of elements to write = 0) and gives a timeout error, but RT VI says that number of elements remaining in FIFO is 0 and hence no data is read. Any idea why it is so? My FPGA and RT VIs continues to run, but with no data being acquired or read.
I saw this behaviour within minutes after running the code. Any idea as to why it is happening? I am trying to reproduce the behaviour and will update if i again encounter with it. Sorry, I cannot post my code here, but i guess the code snippets explain it to some extend.
Thanks
Arya
Edit: Even with the mentioned workaround, the problem persists, now that the FPGA does not write to FIFO at all. And the RT VI is not able to read any elements as it sees 0 elements in the FIFO. The FIFO continues to be in timeout state. So i guess the problem is with the RT side.
Solved!
Go to Solution.
Attachments:
cRIOdevguide_FIFOreadwrite.PNG ‏107 KB
FPGA_FIFO_write.PNG ‏41 KB
RT_FIFO_read.PNG ‏39 KB

Hi Nathan
Yes, I could have replaced it with an OR. Regarding my application, I want to acquire data in chunks of 2000 samples. If at all I receive a timeout error, I want to discard that chunk of 2k samples and start all over again. So my logic was like this, I acquire the data, if there is a timeout, the reset is triggered, and the system waits to comeback from reset, and it starts acquiring again. Btw, I tried removing the multiple FIFO reads in RT, but the error is still the same.
I have a small doubt as well, if I do not want to obtain stale data at alI, I would just check if timeout occurs, empty my FIFO and start acquiring data again (no reset button), isnt it? This was my original logic, but I saw that after a while, it stopped acquiring data and timeout led was on. I was thinking that FPGA and RT was simultaneously trying to acquire FIFO which might cause timeout. Somehow, I now feel that, as you have pointed out, my code is overly complicated. I will modify it and update the results. Thank you!
Arya

Number of Elements - What is it?

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