Inside the Insert point series dialog, you can choose between carteasian and polar coordinates.

]]>Love your program, thanks so much for it.

I want to draw vectors (phasors) for 3 phase power. I know how to use the insert data points using polar coordinates feature to get the end points on the graph but is there an easy way to draw the vector from the origin to the end point. Do I need to do a slope intercept line formula for each vector and set limits equal to the end point?

Sample 30 @ 45 degrees

Also is it possible to add vectors using polar coordinates : eg. 30@45 - 15@120 or do I need to break then into x and y components and sum them and derive the new polar values manually.

Russ

]]>Matt

]]>I have read the manual but it provides no examples. Can someone walk me through the process of entering power functions and getting a graph for them? Are there any tutorials available?

Matt

]]>Andy]]>

-Marco

]]>Graph.Axes.xAxis.ShowNegativeArrow=True

Graph.Axes.yAxis.ShowNegativeArrow=True

After pressing F5 you can see the negative arrows. What I fixed was that you can now use *Save as default* in the *Edit|Axes* dialog afterwards to store the setting so you don't need to do this every time..

1. First you create a point series with your data points.

2. Select the point series and choose *Function|Insert trendline* in the menu.

3. In the *User defined* tab, you can specify your model as **$a*sin(atan(-$b*x))**

4. You can optionally use the *Add model* button to store the model for later use. It also allows you to change the default guess, which is sometimes needed.

5. When you click the *OK* button, Graph will create a function from your model that fits your point series.

f(x) = a {sin[atan(-bx]}

and a set of points. I determined a and b by trial and error to make the curve match the points. Is there a better method to let the software do the work?]]>

Graph.Axes.xAxis.ShowNegativeArrow=True

Graph.Axes.yAxis.ShowNegativeArrow=True

Once this was achieved, I tried to save the settings of the axis as default (so that the next time I start graph the arrows on both ends of the axes would show up). However, the arrows did not show up on startup.

Is there a way to have the arrows on both ends of each axis show up on startup?

Thank you

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