This is certainly not a question we can answer affirmatively either way on Answers. Perhaps customer service could direct you to a good person to ask.
But the way I see it, who owns the plots? That is, who owns the work done? The MathWorks does not own your work, despite the fact they effectively helped you to create it. The owner of the work would logically be the source of the grant money. Recognition of MATLAB as the tool used to do the work seems appropriate in any event, but that seems to be as far as it would go from this end.
IANAL, but carried to an extreme, suppose I build a structure. In the process, I use a hammer. Do I need permission from Stanley Works (the source of the hammer - to whom I have paid fair market value for the tool) to use pictures of the structure in a class I will then teach about building practices? If someone paid me to build the structure, then it is they who must provide any agreement to this use.
