query: matlab function

[nonmm]

i have add the cursor but it doesn't wait for the user to click on the axis.

instead it save into the file.

Message Edited by nonmm on 02-21-2008 01:42 PM

[kehander]

You need to enclose the property node and your second Mathscript node inside a While loop (which should also contain a Wait Until Next ms Multiple, so it doesn't take over the CPU completely).

This is actually fairly basic LabVIEW stuff.  Have you tried looking at the Getting Started guide, or some of the other tutorials available on the NI website?


Message Edited by kehander on 02-21-2008 01:54 PM

[nonmm]

Actually i am quite new to labview. I have looked through the cursor_demo.vi in this discussion board but i can't solve my prob. hope i don't irritate you. 🙂

after going through the steps you told me, i can't seem to capture the cursor into my output file.

Message Edited by nonmm on 02-21-2008 02:41 PM

[kehander]

You put the Write Characters to File inside the While loop as well.  That has to be outside the While loop.  (Oh, wait, you fixed that already.)


Message Edited by kehander on 02-21-2008 02:43 PM

[nonmm]

i have just edited and repaste into the forum and u give me comments. but there is still nothing shown inside the file?

[kehander]

For some reason I can't actually run this VI myself, but I suspect that you need to specify that the output "a" is a double and not a string.  You can then convert the number into a string outside of the script node with the appropriate LabVIEW functions.

One way you can verify this is by wiring an indicator to the output of the MathScript node and see if it contains anything.

[nonmm]

strange i add a "number to decimal string", this time round it keep giving me zero despite my x value is not zero

[kehander]

Yes, a number that is less than one will probably get rounded down to zero if you convert it to a decimal string.