HOW TO DRAW THIS VI:NESTED WHILE LOOP

[gptshubham595]

How to do this ?

source is a matrix of 360*100 it is a image

a=[]
 i = 0
    while i < len(source):
        j = 0
        while j < len(source[0]):
            a.append(i,j)
            j += 1
        i += 1

Is this correct?

[GerdW]

Hi gpt,

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@gptshubham595 wrote:

How to do this ?

Start a text editor and type that text…

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@gptshubham595 wrote:

source is a matrix of 360*100

 i = 0
    while i < len(source):
        j = 0
        while j < len(source[0]):
            MY_FUCTION()
            j += 1
        i += 1

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What exactly is the problem? What have you tried?

I would use 2 autoindexing FOR loops and a subVI named "MY_FUCTION".

Why do you need 2 loops to call "MY_FUCTION" 36000 times? From your question that function does NOT depend on i or j…

[Gregory · Accepted solution]

In LabVIEW we have "auto-indexing" terminals. If you only feed in a 2D array to a for loop, it will run once for each row. If you feed the row into another for loop, it will run once per element, which would be your columns.

[gptshubham595]

I have edited my question, I want to add a bilateral filter over this image. I am confused regarding two nested while loop, 

I know how to implement single while loop 

I have edited My_FUNCTION to a array insert, means I have coded this but I want to put it inside a loop

[GerdW]

Hi gpt,

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@gptshubham595 wrote:

I am confused regarding two nested while loop, I know how to implement single while loop

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Again: use FOR loops with autoindexing inputs!

Place one FOR loop, then place another FOR loop inside the first one to nest them…

[gptshubham595]

is this correct showing i and j?

[RavensFan]

Did you try to run it to prove it to yourself?

No, you need an auto-indexing tunnel on the array wire going into the inner for loop.

Also, your text code seems incomplete.  The syntax doesn't show if the i+=1 is part of the inner while loop or outside of that.  By indentation, it seems to be outside the inner while loop.  But I don't see any syntax that shows where the steps of the inner while loop end.

[gptshubham595]

I want a value at that i,j index at every iteration but this return an array 

even inside the array, I want COLSxROWS, not ROWSxCOLS

means I tried to test this by myself and with a timer but it is not iterating row with cols but I want to iterate with cols with rows

means I want  cols x Rows iteration

1 2 3 4

4 5 6 7

8 9 0 1

1 

4

8

then

2

5

9

Yes "i" is outside the inner while loop 

[RavensFan]

Transpose 2D array before you feed it to your loops.

Also, when you have auto-indexing tunnels, you do not need, and really shouldn't, put a constant on the N terminal of the For Loop.

[Mark_Yedinak]

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@RavensFan wrote:

Did you try to run it to prove it to yourself?

No, you need an auto-indexing tunnel on the array wire going into the inner for loop.

Also, your text code seems incomplete.  The syntax doesn't show if the i+=1 is part of the inner while loop or outside of that.  By indentation, it seems to be outside the inner while loop.  But I don't see any syntax that shows where the steps of the inner while loop end.

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Welcome to Python, where indenting IS your delineation of code blocks.