Plotting multidimensional discrete Data

Hi everyone!

I have some problem visualizing data.

I messured engine power over rpm and torque. Knowing the power input I calculated the efficiency. Now I have 560 values in discrete steps resulting in a 40x14 matrix (basicly 40 different torque settings over 14 rpm settings) and i want to create an area diagram for the efficiency.

In other words: Every column represents one rpm setting (e.g. 250 rpm) and every line represents a torque setting (e.g. 0.1 Nm)

Does anyone have an idea on how to visualize the data? I would like it to look like picture below.

My idea was to use the contour function, but to my understanding it does not work for a 40x14 matrix.

Help is appreciated! Thanks in advance,

Hannes

Answer 1

[Alan Stevens]

Presumably, for every combination of rpm and torque you are able to calculate an efficiency, so you should be able to use contour

contour(x,y,z)

say, where x and y represent rpm and torque and z represents efficiency. Try doc contour for details.