Please tell me what corrections can I make when encountering the following error?

    [X, Y, T] = ndgrid(xspan, yspan, tspan0);
    R_pre = interpn(X, Y, T, u_history, x, y, tref, 'linear');

Incorrect use of griddedInterpolant.

GridVectors must define grids whose size is compatible with the Values array.

Answer 1

[Torsten]

We don't know the contents and sizes of the arrays you use. So we are unable to help.

This would work e.g. :

xspan = linspace(0,1,5);
yspan = linspace(3,5,10);
tspan0 = linspace(0,1,22);
u_history = rand(5,10,22);
R_pre = interpn(xspan,yspan,tspan0,u_history,0.2,4,0.25,'linear')

R_pre = 0.3873