Carriejo

Lesson: Pay attention to the data stored in the buffer. Do clear buffer for device you acquired data from. Patience, patience and hard work. Yes. I will take your suggestion. Set the reset is true outside the loop. Inside the loop, reset is fault. Thank you so much, Ton.

I have found out the problem. I have not reset the histogram function. So when the subvi is called, it remember the history value and gives the wrong histogram distribution. After I have set the True as default value for the reset item of histogram input, it is solved. thanks everyone.

histogram is the subvi. when using as a subvi in getstoppoint, the peak number never reach to 2, always 1.

No input. this subvi gets data from DCA (a broadband oscilloscope), analysis the graph, give the peak number as output. So for the same graph, the output should be the same either I run tha main vi to get the peak number from this subvi's output, or I run the subvi as a independent vi program. Also at the beginning of this subvi, I cleared the buffer of the DCA. So it should not be a problem. I will try to paste the program later. but the pc with labview have no access to Internet. I will print the screen and copy it here later. Thank you so much for your quick response.

when the subvi run by itself seperately, it can give me the right answer. But when I use it as a subvi in the main vi, it can not give the same answer. My program is check the number of the peak of a graph. The vi runs well. But if I made it as a subvi, it can not give the same performance. Anyone can give me a hint to trace it? I have worked for it more than two days. Thanks.

I am a PHD student and English is not my mother language. Using Labview for a few months already. From knowing nothing to knowing a little, sometimes it is really frustrating to looking for one bug and tracing the structure again and again. That is why I am here in a forum to make new friends to share the knowledge of labview, and more important, to share the friendship among the labview users for at least we have something in common here. I would be very happy and appreciated to get any response for my post, no matter short or long one. Because you know, reseach is a lonely life.