MATLAB: How to create a class with functional syntax, like griddedInterpolant

classMATLABsyntax

The documentation for the griddedInterpolant has an example like the following:

    [X1, X2] = ndgrid(1:10,1:10);
    V = X1.^2 + X2.^2;
    F = griddedInterpolant(X1,X2,V, 'cubic');
    [X1q, X2q] = ndgrid(1:0.5:10,1:0.5:10);
    Vq = F(X1q,X2q);

In the last line the object is called like it is a function. Can I create a class with this syntax, and if so, how?

Best Answer

Yes. See the examples on this documentation page and this documentation page that show how to overload indexing to support this pattern.

Related Solutions

MATLAB: How to reduce dimension of griddedinterpolant

whos
  Name             Size               Bytes  Class     Attributes
  eff_map        500x500            2000000  double              
  x_voltage      500x500            2000000  double              
  y_current      500x500            2000000  double

We are given some data as arrays, and you understand how to use griddedInterpolant. What you need to learn next is about building a function handle.

F = griddedInterpolant(x_voltage,y_current,eff_map)

Now, you want to reduce that, for a FIXED voltage, to a function of only one variable. Since 42 is the answer to everything, I'll fix the voltage at 42.

FixedVolts = 42;
F_v42 = @(y) F(repmat(FixedVolts,size(y)),y);

That is all it takes. We can now evaluate the new function at some value or a list of values for the current. We can even plot it as a function of one variable now. I've even set up F_42v in such a way that we can even pass in a complete vector or array for y. The result will be the same shape and size as the input for y.

F_v42(17)
ans =
         0.881963765526607
         
F_v42([1 3 5])
ans =
        0.0952082740655224         0.230322190630928         0.381508409480828
         
fplot(F_v42,[0,50])
xlabel 'y_current'
ylabel 'eff_map @ x = 42'

MATLAB: Expanding matrix

[j k i]=meshgrid([x1,x2]);
xx = [i(:) j(:) k(:)];

Best Answer

Related Solutions

MATLAB: How to reduce dimension of griddedinterpolant

MATLAB: Expanding matrix

Related Question