How to use a data from time series (e.g.) in ode function?

Hi, i want to use data from another mat file which contains a timeseries, below is a simplified example:

tspan = [0 5];
y0 = 0;
tQ = linspace(0,5,25);
Qg = load('GasFlowRate_T.mat', 'Qg');

[t y] = ode45(@(t,y) f(t,y,tQ,Qg),tspan,y0);
plot(t,y)

    function dydt = f(t,y,tQ,Qg)
        Qg = interp1(tQ, Qg, t);
        dydt = Qg*t;
    end

and i will get the error:

Error using interp1>reshapeValuesV (line 439)
Values V must be of type double or single.

Error in interp1>reshapeAndSortXandV (line 419)
[V,orig_size_v] = reshapeValuesV(V);

Error in interp1 (line 93)
    [X,V,orig_size_v] = reshapeAndSortXandV(varargin{1},varargin{2});

but i also couldn't convert from struct to double, how could i exactly to use the data from timeseries?

Answer 1

[Stephen23]

You just need to get the numeric array out of the structure, e.g.:

S = load('GasFlowRate_T.mat', 'Qg');
Qg = S.Qg;

[Wenqing Qiu]

You're right, but if i only use this code, i will stil get error because of my ode function:

Error using odearguments (line 113)
Inputs must be floats, namely single or double.

but i just tried to save my data in array, the everything works.

Through thank a lot for your answer:)