Plotting surface charts when z is not a function of x or y

I need to create a surface plot showing how SKL varies with both Pec and QBERI, but because this is a data set, it is not a function of either of them. Every resource I can find online about this requires the z variable to depend on the x and y, so I've been running into a lot of issues.

[Adam Danz]

How many Pec values are there there? If there are only 4, then a surface plot doesn't seem like the right tool.

I don't see enough of the data to understand whether this suggestion makes sense but why not plot 4 line objects that each have their own Pec label?

hold on
plot(QBERI_1, SKL_1,'.','DisplayName','Pec=1.00E-06')
plot(QBERI_2, SKL_2,'.','DisplayName','Pec=7.00E-07')
plot(QBERI_3, SKL_3,'.','DisplayName','Pec=4.00E-07')
plot(QBERI_4, SKL_4,'.','DisplayName','Pec=1.00E-07')
legend()

Answer 1

[Star Strider]

It would help to have the spreadsheet.

The data can be extracted from it using either table or matrix indexing, once it is immported.

That result needs to create an array like this —

A = [NaN    1E-06    7E-7     4E-7     1E-7
     1E-3   2.17E-8  2.18E-8  2.20E-8  2.21E-8
     7E-4   2.21E-8  2.23E-8  2.24E-8  2.26E-8
     4E-4   2.26E-8  2.27E-8  2.26E-8  2.31E-8
     1E-4   2.31E-8  2.32E-8  2.34E-8  2.36E-8];

figure
surfc(A(2:end,1), A(1,2:end), A(2:end, 2:end))
colormap(turbo)
colorbar
xlabel('QBERI')
ylabel('Pec')
zlabel('SKL')
view(60,30)

Then creating the surface or contour plot (or both) is straightforward.

.

[Jabir]

Thank you very much, this helped a lot!

[Star Strider]

As always, my pleasure!