How to automatically label data point at intersection of plot?

[NotAGenius]

Hey Everyone!

I currently have a loop running in VBA that requires inputs from a user, and then provides data and a plot. Essentially this is a break even function. The plot consists of 3 horizontal lines (will be the same in every plot) , and a linear function (changes based on user input). I am trying to have the intersection data points of each horizontal line and the linear function display automatically. Is this possible? If so, how would I go about doing this?

 

[pgc01]

Hi
Welcome to the board

Get the equations of the lines and solve for the intersections.

The horizontal lines you already have.

You just have to calculate the equation of the linear function, also a straight line, and intersect it with the 3 horizontal ones.

 

[NotAGenius]

Okay I was thinking that as well. Right now I am thinking about running a loop that exits after the intersection and data label is plotted. Is this correct or is there an easier way? I don't want more than one data label, only one at the intersection!

Hi
Welcome to the board

Get the equations of the lines and solve for the intersections.

The horizontal lines you already have.

You just have to calculate the equation of the linear function, also a straight line, and intersect it with the 3 horizontal ones.

 

[pgc01]

Hi

I was thinking another way, ...

but let me tell you how I understood your problem (that may be wrong)

You have plotted some points in a chart, added a linear trendline and want to know the intersections of the trendline to the 3 default horizontal lines that you have.

If I understood correctly then what I would do is to get the equation of the linear trendline and intersect it directly.

For ex., let's say that the equation of the linear trendline is

Y = 2 X + 3

and one of the the horizontal lines is

Y = 7

Then solving

7 = 2 X + 3

X = 2

This means that the intersection point is (2, 7)

 

[NotAGenius]

Thanks for that. Unfortunately it isn't as simple as that.
I have a function that runs a loop based off user inputs and then generates a plot. There are 3 intersections with the 3 standard lines. The problem is I want to automatically generate data labels for the intersection points. The above solution will not work because I have to go through after the plot generates and then find the trendline and solve for x.

 

[Jon Peltier]

Find the X and Y values of each intersection point.

Plot each as a new XY series in your chart, and apply a label to each single-point series.