How to compare rows in 2D array?
Hi,
I have a 2D array of binary.
- I want to compare all rows against each other.
- Two rows should be compared if they have only one different element.
- The result of comparison should be a row with the different element assigned as 2 (or any number different from 0, 1).
- Continue to compare the result rows against each other.
- Repeat it until no row can be compare (those final rows should be presented).
Any idea will be appreciated!
Solved!
Go to Solution.
sangquang wrote:
I have a 2D array of binary.
"Binary" is not a type. deep down, everything is binary one way or another. What do you actually have?
sangquang wrote:
- Two rows should be compared if they have only one different element.
You have your oder of operations mixed up! You need to compare them first before you know if they have different elements.
sangquang wrote:
- The result of comparison should be a row with the different element assigned as 2 (or any number different from 0, 1).
Please explain
sangquang wrote:
- Repeat it until no row can be compare (those final rows should be presented).
Presented how? To the user? Does that mean all the result of the earlier row comparisons should not be presented? Why not?
You post makes very little sense. Please attach a simple VI that contains a simple example of your 2D array (make current value default before saving). Then tell us what kind of result you would expect.
LabVIEW Champion . Do more with less code and in less time .
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How to compare 1000 X 512 arrays
Hello there,
I have problem with comparing large amount of arrays. I have 1000 x 512 arrays. That means i have 1000 lines and each line contain 512 elements. I want to compare this 512 elements of each line and short out same one. how can i do? In result i want only the filtered one that means if out of 1000 line if 200 line are same then i want only 800 arrays that means 800 X 512
Thanx in advance,
dipenIs the 2D array sorted (i.e. are the duplicate rows next to each other)?
Is the duplicate row always the same or can you have several different rows that are duplicate?
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No matter what, this seems like an easy task. Can you attach a VI containing typical data?
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How to delete rows from 2D array in this case...
Hello. I'm just begging adventure with labview so please for patient. I created a program whitch suppose work in following way:
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Solved!
Go to Solution.
Attachments:
plots selector.vi 17 KB
problem.PNG 18 KBI have attached a vi. Is this the one that you need?
Anand kumar SP
Senior Project Engineer
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Attachments:
plot selector modified.vi 14 KB -
How to compare 3 values in array
Hi all
This is my first post so please be tolerant
I need to find "bad values" in array, it will be easier to explain it using example so:
I have array like this: 0 0 0 0 0 0 0 0 5 0 0 0 0 <- so "5" is the bad value, my method is to check two of nearby values so x(i-1) = 0, x(i)=5 x(i+1)=0, and if checked value is more than 25% bigger or smaller it should be replaced by average of neighborhood.
next example: 0 1 2 3 4 9 6 7 8 <- bad value is 9, and result of my filter should be (4+6)/2 = 5
I've done it using formula node (not 20% and not average, but the point is the same) and it's working but now I want to do it without C and I had lots of problems with memory cause the size of array is 10000.
I attached vi and signal thah you can check that it's working fine
Thanks
Mike
Solved!
Go to Solution.
Attachments:
vi+signal.zip 62 KBMeeHow wrote:
next example: 0 1 2 3 4 9 6 7 8 <- bad value is 9, and result of my filter should be (4+6)/2 = 5
Shouldn't e.g. the value 4 be outside too, because the average of 3 and 9 (=5.5) is more that 25% different to 4?
Here is a quick draft comparing three versions (LabVIEW 8.2):
Your formula node version
the same algorithm in G
Something along the lines you are proposing here.
As you can see, the new idea is not quite satisfactory. It needs more thought. Still, these drafts should give you some ideas how to do it. Modify as needed.
Also your data is similar to a square wave and has these large step functions where the value changes dramatically. These should probably be ignored. Maybe you should look at the first derivative and replace parts where a large positive slope is immediately followed by a negative slope of similar size, for example.
You should also look at absolute steps instead of percentages. If you use percentages and the value is zero, everything is outside, because even 5000% of zero is still zero, right?
LabVIEW Champion . Do more with less code and in less time .
Attachments:
filter testMOD.vi 41 KB -
How to compare consecutive groups of numbers in arrays
Hi
I require to place the solution into a 1D array.
I need to compare two arrays and save the same numbers that are in both arrays but also save groups of numbers that may be in only one of the two arrays being compared.
In the example l have not been able to place all consecutive groups of numbers 8,9,10,11,12 into a 1D array.
In the example l need to filter out the zeros and the number four.
The numbers in both arrays are always in descending order however may not be in the order of index number of array. That is 15 = 15 index number
A consecutive group of numbers in this example is a group that increase by a value of 1. E.g.. 8,9,0,22,23,24 are two consecutive groups of numbers.
Thank you
Solved!
Go to Solution.
Attachments:
Compare numbers and consecutive numbers in arrays.vi 17 KBHi Lynn
I did have a look at the consecutive array solution. I have looked and looked l thought l knew how it worked but after a number of separate evaluations with other code l have failed. I am just glad it works. With the consecutive array solution l tried today my own code but l lost either the first number of the last number of a consecutive group of numbers.
I may have confused you but in doing so you have provided a real different view which l am very grateful. You have viewed the consecutive number problem as just a single 1D array problem. By doing this you have opened my eyes to another way to do the job and a way to handle this type of data. However l am also comparing two arrays. For example l have to pick up say two equal values in two columns that the consecutive array does not detect and then correctly locate a value in the final array if the value is not in the final array.
What l have not told you is also l have to be able to identify groups of numbers in two 1D arrays. E.g... Array 1 has 1,2,9,10 next array has 9,10 the final array ends up 9,10 when l would like 0,9,10. When viewing numbers by rows later on l can then detect with a array length vi the length of the 1,2 groups of numbers over a large number of columns. If 9,10 jumps to the front it becomes a wrong length. This is actually my main problem which has caused me a large amount of extra programming. I have gone back to basics to see what l can do differently and you have provided the first clue with the consecutive array. I placed it in my main program today and it filtered a lot variable data which l could not remove without losing real data. The main data lost in your solution was the say 17 number in two columns which in an image is a horizontal line. I know what l have just provided you in this paragraph is all new information but it provides a background as to what l am up to. I am getting pixel data from a 2D array and comparing +1 index 1D array with a normal array. This way l can view the data of the next column to see if there is a pattern. I am actually trying to program an array as how humans view objects in images.
I will have another go at integrating your solution next week
Regards
Michael -
How to compare two rows in PL/SQL?
Hi All,
How to compare two rows in PL/SQL? Is there any method that I can use instead of comparing them column by column?
Any feedback would be highly appreciated.PhoenixBai wrote:
Hi All,
How to compare two rows in PL/SQL? Is there any method that I can use instead of comparing them column by column?What "rows" are you referring to?
If you're talking of rows within a PL/SQL associative array there are techniques as described in the documentation... e.g.
SQL> ed
Wrote file afiedt.buf
1 declare
2 type v1 is table of number;
3 r1 v1 := v1(1,2,4);
4 r2 v1 := v1(1,2,3);
5 begin
6 if r1 MULTISET EXCEPT DISTINCT r2 = v1() then
7 dbms_output.put_line('Same');
8 else
9 dbms_output.put_line('Different');
10 end if;
11* end;
SQL> /
Different
PL/SQL procedure successfully completed.
SQL> ed
Wrote file afiedt.buf
1 declare
2 type v1 is table of number;
3 r1 v1 := v1(1,2,3);
4 r2 v1 := v1(1,2,3);
5 begin
6 if r1 MULTISET EXCEPT DISTINCT r2 = v1() then
7 dbms_output.put_line('Same');
8 else
9 dbms_output.put_line('Different');
10 end if;
11* end;
SQL> /
Same
PL/SQL procedure successfully completed.
SQL>If you're talking about rows on a table then you can use the MINUS set operator to find the rows that differ between two sets of data...
SQL> select * from emp;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7369 SMITH CLERK 7902 17-DEC-1980 00:00:00 800 20
7499 ALLEN SALESMAN 7698 20-FEB-1981 00:00:00 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-1981 00:00:00 1250 500 30
7566 JONES MANAGER 7839 02-APR-1981 00:00:00 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-1981 00:00:00 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-1981 00:00:00 2850 30
7782 CLARK MANAGER 7839 09-JUN-1981 00:00:00 2450 10
7788 SCOTT ANALYST 7566 19-APR-1987 00:00:00 3000 20
7839 KING PRESIDENT 17-NOV-1981 00:00:00 5000 10
7844 TURNER SALESMAN 7698 08-SEP-1981 00:00:00 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-1987 00:00:00 1100 20
7900 JAMES CLERK 7698 03-DEC-1981 00:00:00 950 30
7902 FORD ANALYST 7566 03-DEC-1981 00:00:00 3000 20
7934 MILLER CLERK 7782 23-JAN-1982 00:00:00 1300 10
14 rows selected.
SQL> select * from emp2;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7521 WARD SALESMAN 7698 22-FEB-1981 00:00:00 1250 500 30
7566 JONES MANAGER 7839 02-APR-1981 00:00:00 2975 20
7782 CLARK MANAGER 7839 09-JUN-1981 00:00:00 2450 10
7788 SCOTT ANALYST 7566 19-APR-1987 00:00:00 3000 20
7839 KING PRESIDENT 17-NOV-1981 00:00:00 5000 10
7900 JAMES CLERK 7698 03-DEC-1981 00:00:00 950 30
7934 MILLER CLERK 7782 23-JAN-1982 00:00:00 1300 10
7 rows selected.
SQL> select * from emp
2 minus
3 select * from emp2;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7369 SMITH CLERK 7902 17-DEC-1980 00:00:00 800 20
7499 ALLEN SALESMAN 7698 20-FEB-1981 00:00:00 1600 300 30
7654 MARTIN SALESMAN 7698 28-SEP-1981 00:00:00 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-1981 00:00:00 2850 30
7844 TURNER SALESMAN 7698 08-SEP-1981 00:00:00 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-1987 00:00:00 1100 20
7902 FORD ANALYST 7566 03-DEC-1981 00:00:00 3000 20
7 rows selected.If you actually need to know what columns data is different on "non-matching" rows (based on your primary key) then you'll have to compare column by column. -
How to compare array of String with column of a table
Hi,
i have a array of string(say array is of length 1000). I want to
compare those string in array with one table column
- whether that table column has a string
if yes
do nothing.
if no
then insert that string into table.
- whether table has obsolete row i.e, the one present in table and
not in array
then delete that row.
How do i go about this, because i see, it is not feasible to loop
through array and search table to find new string OR loop through each
row from table to find some obsolete row
How can i accomplish this task more feasibly(without running query for
each string, for comparission)? Is there any way to find this kind of
problem. I would have been easy if i had to compare two tables(with
UNION and INTERSECT), but it is not the case.
thanks,
kath.I'm not sure, whether I understand your problem correctly. Only two comments:
- if both arrays are sorted, all can be done running exactly once simultaneously through both arrays.
- if the column is marked as UNIQUE, all column strings will be different. I.e. you cannot insert the same string a second time.
Regards Thomas -
The attached file is work inprogress, with some dummy data sp that I can test it out without having to connect to equipment.
The second tab is the one that I am having the problem with. the output array from the replace element appears to be starting at the index position of 1 rather than 0 but that is ok it is still show that the new data is placed in incrementing element locations. However the main array that I am trying to build that is suppose to take each new calculation and place it in the next index(row) does not ap
pear to be working or at least I am not getting any indication on the inidcator.
Basically what I am attempting to do is is gather some pulses from adevice for a minute, place the results for a calculation, so that it displays then do the same again the next minute, but put these result in the next row and so on until the specifiied time has expired and the loop exits. I need to have all results displayed and keep building the array(display until, the end of the test)Eventually I will have to include a min max section that displays the min and max values calculated, but that should be easy with the min max function.Actually I thought this should have been easy but, I gues I can not see the forest through the trees. Can any one help to slear this up for me.
Attachments:
regulation_tester_7_loops.vi 244 KBI didn't really have time to dig in and understand your program in depth,
but I have a few tips for you that might things a bit easier:
- You use local variables excessively which really complicates things. Try
not to use them and it will make your life easier.
- If you flowchart the design (very similar to a dataflow diagram, keep in
mind!) you want to gather data, calculate a value from that data, store the
calculation in an array, and loop while the time is in a certain range. So
theres really not much need for a sequence as long as you get rid of the
local variables (sequences also complicate things)
- You loop again if timepassed+1 is still less than some constant. Rather
than messing with locals it seems so much easier to use a shiftregister (if
absolutely necessary) or in this case base it upon the number of iterations
of the loop. In this case it looks like "time passed" is the same thing as
the number of loop iterations, but I didn't check closely. There's an i
terminal in your whileloop to read for the number of iterations.
- After having simplified your design by eliminating unnecessary sequence
and local variables, you should be able to draw out the labview diagram.
Don't try to use the "insert into array" vis since theres no need. Each
iteration of your loop calculates a number which goes into the next position
of the array right? Pass your result outside the loop, and enable indexing
on the terminal so Labview automatically generates the array for you. If
your calculation is a function of previous data, then use a shift register
to keep previous values around.
I wish you luck. Post again if you have any questions. Without a more
detailed understanding of your task at hand it's kind of hard to post actual
code suggestions for you.
-joey
"nelsons" wrote in message
news:[email protected]...
> how do I create a 1d array that takes a single calculation and insert
> the result into the first row and then the next calculation the next
> time the loop passes that point and puts the results in thsecond row
> and so on until the loop is exited.
>
> The attached file is work inprogress, with some dummy data sp that I
> can test it out without having to connect to equipment.
> The second tab is the one that I am having the problem with. the
> output array from the replace element appears to be starting at the
> index position of 1 rather than 0 but that is ok it is still show that
> the new data is placed in incrementing element locations. However the
> main array that I am trying to build that is suppose to take each new
> calculation and place it in the next index(row) does not appear to be
> working or at least I am not getting any indication on the inidcator.
>
> Basically what I am attempting to do is is gather some pulses from
> adevice for a minute, place the results for a calculation, so that it
> displays then do the same again the next minute, but put these result
> in the next row and so on until the specifiied time has expired and
> the loop exits. I need to have all results displayed and keep building
> the array(display until, the end of the test)Eventually I will have to
> include a min max section that displays the min and max values
> calculated, but that should be easy with the min max function.Actually
> I thought this should have been easy but, I gues I can not see the
> forest through the trees. Can any one help to slear this up for me. -
How to compare 2 arrays with different operator options using parameters in Teststand
Pls let me know how to compare 2 arrays using different operators like <= or >= or ==......
I am using TS 2010. FYI
ex:
Array XX [ A_Temp,
B_Temp,
C_Oil Pressure,
D_Oilpressure,
Note : A_Temp, B_Temp,C_Oil Pressure,D_Oilpressure all these parameters will be getting numerical values (dynamically) from the simulink models and also in future I may need to add parameters to this array.
Array YY [A_Temp_1,
B_Temp_2,
C_Oil Pressure_3,
D_Oilpressure_4,
Note : A_Temp_1, B_Temp_2,C_Oil Pressure_3,D_Oilpressure_4 all these parameters will be getting numerical values (dynamically) from the simulink models
So my question :
I would like to verify A_Temp >= A_Temp_1
B_Temp >= B_Temp_2
C_Oil Pressure >= C_Oil Pressure_3 etc -
How to compare the same array?
Hello,
The question not how to compare arrays.
I have a method that gives results of an array type int.
for(......){
int [] arrayFunc(int [] input)
return arrayOut;
}I want to compare those arrayOut arrays. I need to find a way to save the first output and then compare it with the newest output. Where do I have to put the temp array to temporary save the array? What should happen if I want to keep track of the results and get comparisons of first, second, third output?
ThanksStill not 100% sure but I try and help. What you need to do is have two references. After you have generated a result compare it to the last result. After the comparison you need to assign the current result to the last result and then go around the loop again to generate a new current result. Below is some code that uses plain ints but I hope it illustrates what I am trying to explain.
import java.util.Scanner;
class ComparingNumbers {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int current;
System.out.print("Number: ");
int last = scanner.nextInt();
scanner.nextLine();
for(int index = 0; index < 10; index++) {
System.out.print("Number: ");
current = scanner.nextInt();
scanner.nextLine();
System.out.println("Difference is " + Math.abs(current - last));
last = current;
} -
I am reading data from inport in hex form and save it in array to compare data with 0100800000D0.. how can i make hex constant array to store 010080000D0... and then compare it with the array that store data from inport.. (Actually it works as check)
Or there is any other good option
timmy
Solved!
Go to Solution.indo asia wrote:
I am receving data in single byte like 00, 01 or 08.... But my check is 5byte thats why first i store my data in array and than want it to compare. On comparing if its true than i have to send data..
The string diagram constant on your diagram is 10 bytes, not five. Try hex display instead before entering.
Do you (1) stream until five consecutive bytes match the desired pattern, or do you (2) read exactly five bytes, then compare with the constant? In case (2), the outer while loop should probably be a FOR loop. Autoindex at the output tunnel and you get an array with five elements.
What is the purpose of the inner while loop. Should it have a small wait?
You get an I8 value, so doing a logical AND with xFF in the inner loop does not do anything useful. Right?
What's up with all these sequence structures? None are needed. Use the error wire to enforce execution order instead.
You can use "stop if true" so you don't need to invert the boolean.
You forgot to include the subVI. Please attach it.
Here's a quick draft (case 2 above) to get you some ideas. More code is needed to make a complete program, e.g. the inner loop will run forever if there is a problem. Not good.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Compare5Bytes.png 8 KB -
How to compare two rows from two table with different data
how to compare two rows from two table with different data
e.g.
Table 1
ID DESC
1 aaa
2 bbb
3 ccc
Table 2
ID DESC
1 aaa
2 xxx
3 ccc
Result
2Create
table tab1(ID
int ,DE char(10))
Create
table tab2(ID
int ,DE char(10))
Insert
into tab1 Values
(1,'aaa')
Insert
into tab1 Values
(2,'bbb')
Insert
into tab1 Values(3,'ccc')
Insert
into tab1 Values(4,'dfe')
Insert
into tab2 Values
(1,'aaa')
Insert
into tab2 Values
(2,'xx')
Insert
into tab2 Values(3,'ccc')
Insert
into tab2 Values(6,'wdr')
SELECT
tab1.ID,tab2.ID
As T2 from tab1
FULL
join tab2 on tab1.ID
= tab2.ID
WHERE
BINARY_CHECKSUM(tab1.ID,tab1.DE)
<> BINARY_CHECKSUM(tab2.ID,tab2.DE)
OR tab1.ID
IS NULL
OR
tab2.ID IS
NULL
ID column considered as a primary Key
Apart from different record,Above query populate missing record in both tables.
Result Set
ID ID
2 2
4 NULL
NULL 6
ganeshk -
How to increase rows in array more than one ?
Hi all ,
I have an application with string array ,
How to increase array index by x (rows in the array) and not by one as it is in the default ,how to do it ?
10 xHi Doran,
another trick, set your cursor next to the decimal position you want to 'jump' and use the increment control. I *think* you can control the position of the cursor via properties.
Ton
Free Code Capture Tool! Version 2.1.3 with comments, web-upload, back-save and snippets!
Nederlandse LabVIEW user groep www.lvug.nl
My LabVIEW Ideas
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How to increase the number of rows in the array as needed
hello LV
I need advice following
1. To the sine signal of 100 data (100 sampling) to sort 250 rows in the array. It changes the sine signal in the plane that time.
2. To set up a new row by external trigger signal.
Thank youHi Nusorn,
Your question makes little to no sense. Could you explain further, perhaps send some example code of what you have done so far?
Rgs,
Lucither
"Everything should be made as simple as possible but no simpler" -
Delete unwanted rows in 2D array when not knowing the index of which to delete
Hi!
I am kind of new to Labview and I hope that someone can help me with my problem.
First I import a spreadsheet from Excel into a 2-D array of string. For each row in the array I then want to compare the data in a specific column (which is a date (time stamp)) with today's date. Rows containing a date with lower number than today's date I want to put into a new array and the rest I have no need for.
I have succeeded in creating a time stamp for today's date so that it is consistent with the Excel time stamp. But for the comparing and creating a new array part I have no idea about how to do it. I have tried numerous ways with no luck at all (probably because I don't understand all of the VIs that I need to use).
Happy for all help that I can get!
Solved!
Go to Solution.You're on the right track! (although your attempt will only list the datetime values)
What you'll need to add/change is the resulting array need to be connected to the loop as Shift register (with an initial empty array), and in the Case you'll either use Build array to add the current line or send the unmodified through.
You'll probably want to send the full array through and not only the datetime.
You'll probably need some tweak to only use date, but similar to this:
/Y
LabVIEW 8.2 - 2014
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