LabVIEW
While loops
Hi alhabeeb,
@alhabeeb wrote:
Indicated data are wrong. The graph of mass flow rate? The timer cause error when stop the while loop.
- Which data are wrong and in which way are they wrong?
- What's wrong with the "graph of mass flow rate"? Btw. this is a chart and not a graph…
- Which timer causes errors? Which errors does it cause?
- Why do you need "value" property nodes when you could use wires inside the loop??? (Race conditions ahead!)
You really need to learn to provide useful information with your questions!
@alhabeeb wrote:
Hi @ altenbach
There is something wrong. Indicated data are wrong. The graph of mass flow rate? The timer cause error when stop the while loop.
How can fix these issues?
The word "something" is an understatement here!
Why would you replace the large index array with a few shorter ones? Your start indices are obviously wrong, they should be 5 and 9, not 6 and 10. Also if you want to start with index=zero, you don't even need to wire that.
As has been mentioned, do NOT use value property nodes, just wire as before. (You currently cannot tell if the property is read before or after the terminal has been written, but the outcome depends on that. Race condition! Property nodes are also computationally very expensive).
There is no "timer" that can cause any errors.
@ GerdW
I really appreciate what you have done to me. Let's make my question clear ^_^
Dear @ altenbach,
1- Why did you replace saving file by a table?
2- About the index, does the index in the index array represent the number of the physical channel?
3- What is the difference between these induces in your code , and what are they representing?
Thanks
Alhabeeb
- I used the table to make a quick demo and avoid writing files that I don't want. You asked about the scaling math. You already know how to conditionally write to a file, no need to show and explain that again.
- If you don't know what the index of an array element means, you need to go back to the tutorials. An array is a collection of identical elements, each identified by its index. The firs array element has index zero, and so on.
- If you don't know the function of a code element, open the context help (ctrl+h) and hover over it. For more detailed help, do a right-click...help. It's all there!
You still have the wrong indices wired to some of the index array nodes. Did you understand what I said last time?
Hi,
With this
In total I have 11 elements. I split first two (m_prim and m_sec) for the mass flow rate chart, then from the rest, I split first 5 to T_chart and the rest goes to P_chart as shown in the pic. below. It is good.
But when I added ER to the mass flow rate chart:
I got this?!
How can I fix it?
Thanks
Alhabeeb
Hi alhabeeb,
@alhabeeb wrote:
In total I have 11 elements. I split first two (m_prim and m_sec) for the mass flow rate chart, then from the rest, I split first 5 to T_chart and the rest goes to P_chart as shown in the pic. below. It is good.
But when I added ER to the mass flow rate chart:
You don't "add", but you create a 2D array from elements!
And you do this creation in the wrong order!
Why don't you create a 1D array from your two m_* elements and one ER element and then build a 2D array from this 1D array to plot in the chart? (And so you would apply the very same algorithm as is used with the other charts!)
