Draw / rotate line in plots

JonesFox

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..

MartinLiebig

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