LabVIEW
Help needed for using Waveform graph indicator
I am making a VI that plots y=Ax^2 + B, where all the variables are controls, also the Vi should use front panel control to enter the no. of points N to eavaluate the polynomial over the interval x0 to x n-1. I want to plot y vs. x.
This is where i am getting confused?
does N means the no. of loops(for loop) i want the VI to run. i am not able to plot y vs. x???
does N means the no. of loops(for loop) i want the VI to run. i am not able to plot y vs. x???Please help with both these problems.
Thanks for any help..........
Is this a school project?
X will vary, so it should not be a front panel control, but calculated from the iteration terminal of the loop.
A and B should go outside the loop, they should not change during loop execution
Inside the loop calculate x and y for each [i]. They will turn into arrays at the loop boundary, containing the set of X-values and Y-values for the graph. Now use an xy-graph to plot y vs x.
See how far you get. 🙂 Check the online help and the LabVIEW example finder for more ideas.
First of all, you should remove the timing node. There is no need to slow down the calculation. 😮
Currently, you use [i] directly for x, which is often a bit limiting. You should calculate and x based on [i] instead. (for example" x=0.1*[i] or x=[i]-50, etc. depending on the x-values you want.)
Of course a much simple version of your code would be:
- Use the Ramp Pattern to generate the desired x values (inputs are: start x, end x, number of points).
- Use the polynomial evaluation function with the x-array and the [ABC]-array to generate the y-array.
- graph it! Just bundle the x- and y-arrays and feed the cluster to the xy graph. No need to go through the express node.
Happy wiring!
