Hi Adam,
I am assuming you are using R2017a, but if you are using a release within the past 3 years the interface will be very similar.
1.
- For Data Import
You can import your data into MATLAB in many ways. See the link below for details:
https://www.mathworks.com/help/matlab/import_export/recommended-methods-for-importing-data.html
One way is from the HOME Tab >> Import Data >> Select the appropriate file. Many file formats are supported, but you can find the additional details here:
https://www.mathworks.com/help/matlab/import_export/supported-file-formats.html
Another way to do this is by clicking the New Variable button and copying and pasting the data in the variable matrix. Then you can rename this variable to something that aligns with your data.
- For Graphing the Data
The surface plot will be adequate. You can find details for it in the link below:
http://www.mathworks.com/help/matlab/ref/surface.html
Note that the surface plot can take a matrix as input argument (air fuel ration matrix data), and it can also take x and y vectors (let's say RPM and Pressure Ratio) with a data matrix (say air fuel ratio). I think the fastest way to get started with the plotting is to use the PLOTS tab. This is a more interactive way to generate plots thank using the plotting commands, but it is very important to understand how the plotting functions actually work. You can generate graphs from the PLOTS Tab by selecting existing variables from the Workspace and then clicking one of the available plots.
For instance, if in the Workspace you have a vector variable called RPM and another vector called PressureRatio and a matrix called AirFuelR, then you can select them (in that order) and then click one of the available plots (Surface).
2. To Re-Scale the PE Axis
For this part you may need to be familiar with creating and modifying vectors and matrices in MATLAB. I have included two useful links below that have info on the colon notation and the linspace function:
http://www.mathworks.com/help/matlab/ref/colon.html
https://www.mathworks.com/help/matlab/ref/linspace.html
Good luck and have fun!
