Some question about 2D array

[Amuno]

I have construct a 2D array with either one or zero and want to convert it into a boolean 2D array

Can anyone help me to solve it?

Also, for an array, i want to start with a fixed size(let say 8X32) 2D array with all zero 

and then the data can be changeable later, how can i do this?

Thank You!

[devchander]

Hi,

This VI should answer your questions

Here, i am initially creating a numeric array, converting it to boolean( just by checking if the element is zero or not)

Later, on the run user can modify the array elements

You will observe that i am using a ring while adding to array.

All i am doing here is creating a ring -> giving its values as 0 and 1-> and later reading this ring text ->conveting it ot numeric ->and adding to array at the click of the 'add to array' button. you can select row/column at which u want to modify the entry.

To simplify, You can also just add a value from a numeric control directly.

Hope this helps

Regards

Dev

Message Edited by devchander on 01-09-2006 01:40 AM

Message Edited by devchander on 01-09-2006 01:58 AM

[GerdW]

Hi,

I simplifies devchanders example a little bit:
- LabView can do math with arrays, so you don't need for loops to check the 2d array
- why don't you use local variables here but property nodes?
- when you use property "ring.text" to convert to number, then you shouldn't use a "O" instead of an "0". And why not use the ring value itself?

[devchander]

Ouch!

It slipped my mind that 'not equal to zero' can take array input too! must be getting balmy after a break!

Thanks GerdW !

For some reason, i seem to prefer Property nodes over local vaiables! so i used property node, just like that!

 And that O instead of 0 was a Typo!

Oh Yeah, ring value can be used directly

regards

Dev

Message Edited by devchander on 01-09-2006 03:01 AM

[JeffBoettcher]

Just a reminder to be careful when using any equality operation on floating point numbers.  A floating point number can look like 0 without being the binary representation of identically 0, and therefore will not compare as you would expect.  Unless there is some reason they need to be DBL, you'd be better off making the numeric array an integer-based type.  If they have to be DBL, then it'd probably be safer to ask if it's > 0.5 instead of != 0.

[devchander]

Jeff has a point there!

This attached Vi will demonstrate how equal/not equal to zero may not give an expected result for dbl type

Regards

Dev

[3457]

hi,

  I wanna ask how can i get data from a spreadsheet file to an array in labview so i can work on it????

  And then how can i export it to another file?

Newbie alert!!!

Pls help

[Ankita]

Hi,

Check out the Read from spreadsheet file function in LabVIEW for getting data from a spreadsheet file into an array in LabVIEW. You can now write the data to a file using Write File or Write to spreadsheet File functions.

Hope this helps,

Ankita