MATLAB: Error using horzcat Dimensions of arrays being concatenated are not consistent

Question

hello. i solve some differential equation with ode45. The answers are correct and there is no error.because i want to show some variables that are not in diffrential equation i use the command:

[dx phee] =melanie_ode_fj(t,Y)

but there is this error:

Error using horzcathorzcat
Dimensions of arrays being concatenated are not consistent.

i do not know why ? the codes run correctly and there is no error.

codes are long so i attach them.

you should run MAIN.

Thanks

Answer 1

Your ‘melanie_ode_fj’ function has only one output (as it should):

function dx=melanie_ode_fj(t,x) 

If you want other outputs from it, create a second version of it (with a slightly different name, I call it ‘melanie_ode_fj_more_outputs’ here) with the outputs you want.

Then, use a for loop and the results of the original ‘melanie_ode_fj’ integration to get the other information you want.

For example (assuming your time vector is ‘t’):

for k = 1: numel(t)
    [dx{k} phee{k}] = melanie_ode_fj_more_outputs(t(k),Y(k));
end

NOTE: This is UNTESTED CODE and is for illustration purposes only!