Draw / rotate line in plots

User: "JonesFox"
New Altair Community Member
Updated by Jocelyn
I want to evaluate the performance of my model by plotting the measured output variable on the X-axis and the prediction of the output variable on the Y-Axis. That, I can do with the normal scatter plot option. Additionally, I want a line (Ursprungsgerade) in an 45° angle to help me judge visually how far the predictions are from the optimal line. 
Here is a example how I did that using matplotlib.

How can I do that in RapidMiner? I only find the option to draw horizontal or vertical lines. In the following picture I drew a vertical line, but I want to rotate it..

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    User: "MartinLiebig"
    Altair Employee
    Accepted Answer
    Hi,
    I usually just add a line chart with mechanical_strength vs mechanical_strength, this is the straight line through the origin you search for.
    Best,
    Martin
    User: "JonesFox"
    New Altair Community Member
    OP
    Accepted Answer
    Yes, thanks! That's a nice workaround I didn't think of.