How to plot engine map

Hello there,

I want to create an efficiency map or SFC map for an engine using contour. Now this is what l have Te engine torque is a vector [1,N] we engine angular speed is a vector [1,N] nf engine efficiency is a vector [1,N]

this is what l tried : contour(we, Te,nf) but it came up with the following error Error using contour (line 81) Z must be size 2x2 or greater.

is it possible to convert a vector? or Is there another another function to plot my engine map?

Your help is very needed thanks in advance

[Junfei Tang]

You can have a look at the link below. I think this might be similar to your question. http://www.mathworks.com/matlabcentral/answers/44515#answer_208604