How to use interpolate struct data in simulink?

I have a struct data file in .mat format.

I can use interp2 to interpolate the data from this struct data file in matlab.

for example,

h = interp2(data.P,data.T,data.H,234e+05,317)

How to do similiar like this in simulink?

Answer 1

[Fangjun Jiang]

In general, in Simulink, the "2-D Lookup Table" block can be used to do what interp2() does in MATLAB.

You need to figure out the proper size for the input arguments though. Your example certainly has problem due to un-matched size.

data.P=1:4;
data.T=1:3;
data.H=rand(3,4);
h = interp2(data.P,data.T,data.H,1.5,2.5)

h = 0.2963

data.P=rand(3,4);
data.T=rand(3,4);
h = interp2(data.P,data.T,data.H,0.5,0.5)

Error using griddedInterpolant
Grid arrays must have NDGRID structure.

Error in interp2>makegriddedinterp (line 226)
F = griddedInterpolant(varargin{:});

Error in interp2 (line 134)
F = makegriddedinterp(X, Y, V, method,extrap);

[Anup]

I only need P, T, H and all the other values can be excluded. Don't these three variables have same size. If we were to consider only these three variables, could you kindly explain to me how we can perform interpretation using a lookup table? Thank you very much for your help.

I have attached the .mat file (reduced file size).

[Fangjun Jiang]

My example should already explain it. If you want to run

h = interp2(data.P,data.T,data.H,234e+05,317), H is 301x400, then P needs to be 1x400 and T needs to be 1x301. See doc interp2