interpolation on look up table

Question

Brasco , D. 2014-9-2

评论： Brasco , D. 2014-9-2

Hi guys i am new with this staff and i have problem.

I have three variables Altitude and Force which ara A, F and M.

A=5x1 matrix let sayA=[1000 1500 2000 2500 3000] and

F=20x1 F=1:1:20;

I have a table M=20x5 that consist of every M value for each altitude A, and Force F

eg. M(1,1)=M(Altitude{1000},Force{1}) , M(2,1)=M(Altitude{1000},Force{2})

like these.

My problem is, i need to find M values using interpolation between break points, like A= 1250 and F=2.5 M=?

how can i do this ?

Answer 1

Andrei Bobrov 2014-9-2

Use griddedInterpolant:

A = 1000:500:3000;
F = 1:20;
M = randi([-100 100],20,5);
[X,Y] = ndgrid(F,A);
FF = griddedInterpolant(X,Y,M); 
out = FF(2.5,1250);

Brasco , D. 2014-9-2

thank you very much