How to create 2D array

[sl2obel2ts]

Hi

I am pretty new to labview. I need to make 250x250 array filled with value 300, so I can substract this array from an array derived from an image (for background substraction). How can I do this? 

thanks.

[sl2obel2ts]

nm, i got it.

[altenbach]

Well, you don't tell us how you are doing it, so here's the correct way.

You pose the question wrong, because you don't need to create a 2D array at all, you can just subtract a scalar from the 2D array and LabVIEW does the rest. Is that what you got?

Message Edited by altenbach on 08-18-2008 04:45 PM

[sl2obel2ts]

reallly?

when i subtract it, it just doesnt let me put in constant. it asks me to put a 2d array. the thing is that I have a imaq vision (yes that $3200) and it had subtract operator... but I'd love to know how you did this though.

[altenbach]

Sorry, I don't have the vision stuff, but if you use the plain subtract primitive from the numeric palette, subtracting a scalar from a 2D array should work without problem.

Maybe you are trying to use a more complicated tool designed to subtract two images from each other?

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sl2obel2ts wrote:

when i subtract it, it just doesnt let me put in constant. it asks me to put a 2d array.

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How doesn't it "let you"? How does it "ask"? Do you simply get a broken wire?

Can you explain?

Message Edited by altenbach on 08-18-2008 05:25 PM

[lmtis]

If you wire the array to the subtract first and then right click to create a constant to the other input it will default to an array.  For the constant input, create the constant first and then wire it.