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

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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

Use boolean array to perform set operations

I am currently taking a computer science class that uses Java as the language of choice. I have no prior experience with Java. We have a homework assignment in which we are supposed to use a boolean array to implement set operations. We have to create a method that inserts an integer into the array, another that deletes an integer element, and several others. I am confused as how to do this with integers, as it is a boolean array. The datr for this class is:
private boolean base[];The constructor is:
public largeset(int size){ }We then have to create a method that inserts an integer into the array:
public void insert(int i){ }And one that deletes the element:
public void delete(int i) { }I am unsure how to do this using a boolean array. If it were an integer array I would not have any trouble, but I get an error when trying to insert/delete an integer from the boolean array. Can anyone help point me in the right direction? I would prefer advice only, not the actual code, as this is a homework assignment, and I would like to create the code myself so I actually know what I am doing. Thanks.

This is the assignment exactly as posted on the course website:
In this homework, we will use a boolean array to implement various set operations. Please create a class called largeset that supports set operations of any number of elements. The data of this class is
private boolean[] base;The constructor of the class is
public largeset(int size); // create a boolean array of size "size" and store it in "base"The methods of the class are:
public void insert(int i); // insert number i into the current set, where 0 <= i < base.length
public void delete(int i); // delete number i from the current set, where 0 <= i < base.length
public boolean member(int i); // test if i is in the set
public largeset union(largeset B); // return the union of two sets
public largeset interset(largeset B); // return the intersection of two sets
public largeset subtract(largeset B); // return the subtraction of two sets
public largeset complement(); // return the complement of the current set
public boolean subset(largeset B); // test if the current set is a subset of set B
public int cardinality(); // return the number of elements in the current set
public String toString(); // return a string which is a printing of the current setThen create another class called testset that uses the largeset class. At first, please create the following two sets:
X = { 1, 3, 5, 7, ..., 999 };
Y = { 9, 18, 27, 36, ..., 999 };
Please perform the following tests:
1. display the cardinalities of X and Y, respectively.
2. display the content of substraction of Y by X.
3. display the square root of the sum of all the elements of X (Math.sqrt(x) will return the square root of x in double type).
4. For every pair of distinct elements x and y in Y, compute the sum of (Math.max(x, y) - Math.min(x, y)) (or equivalently, Math.abs(x - y)), and report this sum.

How define size for String of Array ?

Hai,
How to define a String of array with size ?
String[] item={"a","b","c"};
but before this statement i want give the size for the String of Array
suppose if i give the size 10
String [10] item;
but it's give "Not a Statement Error"
Please give me an idea !
Thanks & Regards,
Merilna

String[] s = new String[10];

Oracle DBSL - Determine / Define size of fetch array

Hello guys,
i have a question about the Oracle DBSL and how it determines the size of the fetch array.
I am refering to the following documents / documentations:
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/86a0b490-0201-0010-9cba-fd5c804b99a1
Quote:
As long as you do not program an UP TO ROWS in ABAP, the database gets as many table rows as possible per communication set (as many as fit in 32k).
http://help.sap.com/saphelp_nw04/helpdata/en/d1/801f96454211d189710000e8322d00/frameset.htm
Quote:
You have to specify the size of an array before runtime. However, because you cannot know the size of the dataset the system will return, you must define a very large array to avoid an overflow.
To circumvent this problem, the SAP Basis System translates ABAP Open SQL statements into Embedded SQL. To do this, the system defines a cursor.
Ok but the translated embedded SQL code has also to specifiy an array fetch size (how many rows are retrieved by one fetch).
Is this a profile parameter or is it really calculated (how many rows of a specified table would fit into 32k) dynamically in the DBSL?
Regards
Stefan

Hello Michael,
i am refering to the documentation of DEFAULT_SDU_SIZE:
> Use the parameter DEFAULT_SDU_SIZE to specify the session data unit (SDU) size, in bytes to connections.
> session data unit (SDU)
>A buffer that Oracle Net uses to place data before transmitting it across the network. Oracle Net sends the data in the buffer either when requested or when it is full.
Ok, that controls the transmit moment in the network layer.. but not the number of rows which are returned by a single FETCH call (through the OCI). (For example in sqlplus it can be set with set arraysize XX)
I have tested also a little bit around with different sap standard tables in an ERP 2005 system.
I have activated a SQL Trace (ST05) and done a "select * from <TAB>" via SE16 (no count limit!).
In my tests there were fetched different number of rows - take a look by your own:
Time Object    Operation Rows   Returncode
2.451 T100       FETCH     321      0
1.915 T100       FETCH     321      0
1.912 T100       FETCH     321   1406
1.246 E071K      FETCH     109      0
1.218 E071K      FETCH     109      0
1.155 E071K      FETCH     109      0
T100 (4 VARCHAR columns)
E071K (14 columns of different types)
So it seems like the DBSL dynamically calculates the number of rows which can be returned by a single fetch call based on the row size (number of columns and column sizes) and other unknown factors.
If this is true, it would be really great and nothing have to be done by us (the customers!).
But if the DBSL dynamically calculates the max. number of rows per fetch:
Why is a "SELECT * FROM <TAB> INTO <ITAB>" preferred - the SELECT Statement in a LOOP (like in the example) is also fetching the max number of rows by each fetch, or?
The example: http://sap.mis.cmich.edu/sap-abap/abap04/sld017.htm
That was only a notice on some small tests, which i have done.. maybe someone knows it in detail.
Regards
Stefan

1D Boolean Array to 1D Integer Array conversion for FPGA FIFO

Hello, I am using a PXI7813R card. I would like to pass some data between the target (FPGA) vi and the host vi using the FIFO. I have a FIFO setup to 1023 "32 bit integer" samples. I have a boolean array of 32000 samples which would be the same as 1000 32 bit integers, that I acquired using the PXI7813R card. I would like to convert the 1D boolean array to a 1D "32 bit intger" array. This seems like a more a difficult problem than I first thought as the labview functions are reduced when targetting a FPGA device. I have attached a jpg of how I would like to do it. I am getting a "Arrays must be fixed size in current target" error for the output from the array subset function. I know this is because one of the inputs is not exactly a constant, i.e. the index input for array subset, but regardless of the index, I will only ever be taking 32 bits from the boolean array at any time to convert to a 32 bit integer to then place in the FIFO. Any suggestions of how I may get around this problem would be gratefully recieved. Regards, Michael.
Message Edited by Michael_Limerick on 02-08-2008 04:54 AM
Attachments:
fifo_out1.JPG ‏52 KB

Hi Daniel,
Thanks for your reply.
I had a look at the thread that you suggested and I'm not sure if that would solve the problem I was having, the option box was checked as default. I think my issue has to do with the limitations of the different LV functions when targeting a FPGA device.
I have decided to take another route anyway, it seems that trying to compile a large array (even a 1D boolean array) for a FPGA target both takes a long time and also a lot of FPGA resources.
Thanks again for your reply,
Regards,
Michael.

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

Crystal Reports for Enterprise - SQL Command - Array Fetch Size

We're attempting to migrate a report created in Crystal Reports 2013 Support Pack 3 Version 14.1.3.1257 to...
Crystal Reports for Enterprise Version 14.1.3.1300 Build: 2013 Support Pack 3 Patch 1
The originating report is successfully connecting and returning data from MySQL through the MySQL ODBC 3.51 Driver (3.51.30.00), using a SQL Command
When opening up this report in CR for E and running the report against the same database and the same version of database driver, we get the following Crystal Reports error:
Crystal Reports
A problem was encountered
The following error has occurred while trying to retrieve the data:
Error on Fetch : Largevarchar and Largevarbinary data cannot retrieved as variable-length data if the array fetch size is not set to 1.
Please check with your System Administrator that the data source is correctly configured.
How would we check and where would we adjust the array fetch size within Crystal Report for Enterprise?
Thank you

Hi Vitaly,
I had not yet tried creating a new report based on the query, within CR for E, but I did now upon your request\suggestion. Yes, it fails as well with a brand new report..same new error as above: "Non Supported Datatype"
I've pasted the SQL we are using below. I just tried running this exact query natively through MyPHPAdmin, and also creating a brand new report with Crystal Reports 2013 against the same ODBC driver that I am trying to use within CR for E. In both cases the query was accepted and ran successfully.
Driver info:
MySQL ODBC 3.51 Driver - Version 3.51.30.00
I have also tried 2 newer versions of the driver:
MySQL ODBC 5.3 ANSI - Version 5.03.02.00
MySQL ODBC 5.3 Unicode - Version 5.03.02.00
...where I also configure each within the Information Design Tool so that the "Array Fetch Size"= 1
I receive the same "Non Supported Datatype" error for these drivers as well. The MySQL server version is: 5.1.73-0ubuntu0.10.04.1-log
Protocol Version: 10
MySQL charset: UTF-8
Here is the query:
SELECT ft.seq_id, ft.ticket_date, ft.posttotal,
wl.name as current_approval_level,
TIMESTAMPDIFF(DAY,ft.ticket_date,NOW()) AS Days_Since_TicketDate,
TIMESTAMPDIFF(DAY,ft.date_created,NOW()) AS Days_Since_Created,
TIMESTAMPDIFF(DAY,wph.workflow_date,NOW()) AS Days_Waiting_Your_Approval,
ft.internal_comments
FROM ticket AS ft
LEFT JOIN unit AS unit ON (ft.unit_id = unit.id)
LEFT JOIN unit_district AS udist ON (udist.unit_id = unit.id AND (udist.effective_date IS NULL OR udist.effective_date = 0 OR udist.effective_date <= ft.ticket_date)
AND (udist.expiry_date IS NULL OR udist.expiry_date = 0 OR udist.expiry_date >= ft.ticket_date))
LEFT JOIN workflow_document_process_map AS wdpm ON (ft.id = wdpm.document_id AND wdpm.document_type_id = 1)
LEFT JOIN workflow_process AS wp ON (wp.id = wdpm.workflow_process_id)
LEFT JOIN workflow_rule AS wr ON (wp.workflow_schema_id = wr.workflow_schema_id AND wp.workflow_level_id = wr.workflow_level_id AND wr.workflow_activity_id = 2 AND (wr.effective_date IS NULL OR wr.effective_date = 0 OR wr.effective_date <= ft.ticket_date) AND (wr.expiry_date IS NULL OR wr.expiry_date = 0 OR wr.expiry_date >= ft.ticket_date))
LEFT JOIN workflow_rule AS wr2 ON (wp.workflow_schema_id = wr2.workflow_schema_id AND wp.workflow_level_id = wr2.workflow_level_id AND wr2.workflow_activity_id = 4 AND (wr2.effective_date IS NULL OR wr2.effective_date = 0 OR wr2.effective_date <= ft.ticket_date) AND (wr2.expiry_date IS NULL OR wr2.expiry_date = 0 OR wr2.expiry_date >= ft.ticket_date))
LEFT JOIN workflow_process_history AS wph ON (wph.workflow_process_id = wp.id)
LEFT JOIN ticket_attachment AS ftattach ON (ft.id = ftattach.ticket_id AND ftattach.attachment_type_id = 2)
LEFT JOIN person AS p ON (ft.supervisor_id = p.id)
LEFT JOIN person AS p2 ON (ft.head_office_contact_id = p2.id AND (p2.effective_date IS NULL OR p2.effective_date = 0 OR p2.effective_date <= ft.ticket_date)
AND (p2.expiry_date IS NULL OR p2.expiry_date = 0 OR p2.expiry_date >= ft.ticket_date))
LEFT JOIN person AS p3 ON (ft.sales_person_id = p3.id)
LEFT JOIN person_company_sales AS pcs ON (p2.id = pcs.client_person_id AND pcs.company_id = ft.client_company_id)
LEFT JOIN person AS p4 ON (ft.created_by = p4.id)
LEFT JOIN person AS p5 ON (ft.well_site_supervisor_id = p5.id)
LEFT JOIN division AS d ON (ft.division_id = d.id)
LEFT JOIN district AS dist1 ON (ft.district_id = dist1.id)
LEFT JOIN district AS dist2 ON (udist.district_id = dist2.id)
LEFT JOIN company AS c ON (ft.client_company_id = c.id)
LEFT JOIN province AS prov ON (ft.job_province_id = prov.id)
LEFT JOIN ticket_attachment AS ftattach2 ON (ft.id = ftattach2.ticket_id AND ftattach2.attachment_type_id != 2)
LEFT JOIN locale_currency AS lc ON (lc.id = ft.locale_currency_id)
LEFT JOIN operation_type AS ot ON (ot.id = ft.operation_type_id)
LEFT JOIN incident AS i ON (i.ticket_id = ft.id)
LEFT JOIN invoice_type AS it ON (it.id = ft.invoice_type_id)
LEFT JOIN workflow_level AS wl ON (wl.id = wp.workflow_level_id)
LEFT JOIN company AS dist1_company ON (dist1_company.id = dist1.internal_company_id)
WHERE 1
AND ( pcs.sales_person_id = 2113 AND pcs.effective_date <= ft.ticket_date AND ( pcs.expiry_date >= ft.ticket_date OR pcs.expiry_date = '0000-00-00 00:00:00' OR pcs.expiry_date IS NULL) )
AND ft.closed_flag <> 1 AND (wr2.id IS NOT NULL OR wr2.id != 0)
AND ft.commit_flag = 1
AND ft.dispatch_status = 0
AND dist1_company.country_id = 1
AND wr2.role_id = 2
GROUP BY ft.id
ORDER BY ticket_date ASC, ft.id ASC
Thanks you for your help.

While Loop to Monitor a 1D 8Bit boolean Array for changes

Hi;
I need help in monitoring a 1D 8-bit boolean array for a value change. I think I need to use a while loop with shift registers???
Any suggestions?
Thank you,
4BoysDaD

Where are you going to put it in your code. It will depend on what you are already doing. Here is an example to show you how to do it with out shift registers.
Tim
Johnson Controls
Holland Michigan
Attachments:
Example.vi ‏8 KB
Check of 1D Boolean Array has Changed.vi ‏8 KB

Allow boolean arrays as input for "Array Min & Max"

The Array Max & Min function is quite versatile, but for some reason it does not accept boolean arrays. This restriction make no sense at all. Since we can easily sort boolean arrays, this function should work too! It would come in handy for example if looking for the position of a single TRUE in a 2D array (search only works for 1D arrays!). Array min & max would simply return the index pair of the first TRUE found. As a workaround, we currently need to insert a "boolean to 0,1" to get the same effect. This seems unecessary.

> I have to disagree with the need to do this LabVIEW prides itself of function polymorphism, but there are these nagging little holes that give you a broken wire for no obvious reason at all. Sure there are workarounds, but the beginner programmer might construct a horrible Rube Goldberg style workaround, full of duct tape and bailing wire. We can sort boolean arrays so there is a clear order between TRUE and FALSE ---> there is a MAX and a MIN and the function should return it. Note that Array Min&Max even works for string arrays, where it outputs the lexically sorted first and last array element. (Hey, I did not know that, could be useful sometimes!). Not allowing boolean array inputs is an unnatural exception and should be fixed. A similar case is described in this suggestion (which did not get much attention either)

Doubling size of 2D boolean array

Hi there.
I have a 20x20 2D boolean array and need to convert this to a 40x40 2D boolean array. If the first element of the 20x20 array is a 1, the first two elements of the first and second line of the 40x40 array need to be a 1 as well.
Thanks in advance!
Solved!
Go to Solution.

jdepypere wrote:
I have a 20x20 2D boolean array and need to convert this to a 40x40 2D boolean array. If the first element of the 20x20 array is a 1, the first two elements of the first and second line of the 40x40 array need to be a 1 as well.
Boolean elements are either true of false, they are never 1.
You are leaving out a lot of scenarios. For example what should happen if the first element is FALSE?
Do the other elements matter too or can they be random?
Please be much more specific.
LabVIEW Champion . Do more with less code and in less time .

Programmatically Cycle through Boolean Array

I'm using an Agilent 34970 with a 34901A switch module. It has 16 switches going to two commons. The end function is to switch through all the sources to read resistance and voltage.
The driver and sample vi from the NI idnet were used as a base for my vi.
The sample vi uses a user-controlled 2-d boolean array (false = open). I want to be able to programmatically cycle through all the switches, but I don't know how to tell the dimensions of array I have.
I would like to go through every element of the 2nd raw for each element in the 1st row. If I could programmatically ignore elements #9, 10, 19, and 20, that would be helpful too.
Thanks for any help!
Attachments:
Agilent 34970 Advanced Scan-2U test-1.vi ‏31 KB
Agilent 34970 Switch-2U test.vi ‏23 KB

CelerityEDS wrote:
Is there a way to determine what's in the vi front panel right now? I cannot determine if it's 2x10 or 10x2... There are no properties of the 2-d array that plainly tell me.
There is "array size" which tells you the actual size of the 2D array.
There are properties that tell you how many rows and columns are visible in the front panel array container.
There are also properties that tell which element is currently scrolled to the top left corner.
The size and index position of the front panel array control or indicator is not related to the actual array size. You can show only 2x2 elements of a 1000x1000 array or vice versa. if the container is too big, the extra elements are greyed.
LabVIEW Champion . Do more with less code and in less time .

Change spacing between "LED's" in 2D boolean array indicator

Hi All
In my application I am tring to mimic a LED matrix sign using a 2D boolean array indicator. Its obvious enough how to chage the size of the LED's in the array indicator but I would also like to reduce the spacing between LED's as I have very small leds with two much space between them!!
Could someone kindly send me an example or tell me waht steps to take using customize indicators function etc.
Also can this be changed programatically using property nodes, so for instance i can resize the spacing to mimic LED signs with different LED densities?
Many Thanks!
Tristan

Hi Tristan
You could try customising the boolean in your array. Right click on an element of your array, select Advanced->Customise.... You can then modify the appearance of the boolean to your requirements, using decorations for example to modify the spacing.
You will be prompted to update your array with the modified version once you have finished your edits.
Had a quick play, see attachments
Hope this helps
Steve
There are 10 types of people in the world that understand binary, those that do and those that don't.
Attachments:
ModArray.vi ‏9 KB
ModBoolean.ctl ‏6 KB

What is the max number of bits a boolean array can have?

Hello,
What is the maximum number of bit that a boolean array can have?
Regards,
Kaspar
Regards,
Kaspar

There is no real size limit. (except for the natural limits of arrays because the size is a 32bit integer, etc.)
... of course if you ever plan to convert it back to an integer using "boolean array to number", you better stay below 64 bits.
Can you explain what you want to do in a bit more detail?
Message Edited by altenbach on 05-23-2007 02:51 PM
LabVIEW Champion . Do more with less code and in less time .

ASC file to 2D boolean array

Hey guys,
I was wondering if there is a method of uploading an *.ASC or *.DAT file to convert into a 2-D boolean array.
For example, I would create an .asc or .dat file composed of strings using MATLAB to generate
1 1 0 1 1 0 1 1
0 1 0 0 1 0 0 1
1 0 0 1 0 0 1 0
and it would convert the string to a 2-D boolean array of
T T F T T F T T
F T F F T F F T
T F F T F F T F
so that I can ultimately use it to create a modified Digital waveform graph like this:
The purpose is because I will be using sample rates of 0.1 second intervals that spans to 2-5 minutes.
So to sum it up:
1. upload a *.ASC or *.DAT file with a 2-D array strings
2. convert the file to create a 2-D boolean array for use to create the digital waveform
Any help will be appreciated. I know it isn't much but I've uploaded the 2-D array to waveform *.VI for testing purposes.
Solved!
Go to Solution.
Attachments:
boolean_array.vi ‏14 KB

sdkpark wrote:
However, when I tried that first, it doesn't know how to separate each column of the *.asc file
1 0 0 1 0 0
0 1 1 0 1 1
turns out just to read the first column
Please attach your VI instead of a meaningless picture.
Read from spreadsheet file will read all 2D data if used correctly. The defined delimiter is separating items, and linefeed separating rows. For example if you don't wire the delimiter, it will assume "tab" and only one value will get read per line if it is actually a space character. Try a delimiter of "space".
LabVIEW Champion . Do more with less code and in less time .

NSArray for boolean array, define size...

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