# Error using horzcat Dimensions of arrays being concatenated are not consistent?

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Najmeh Eskandari on 14 Jan 2019
Commented: Stephen Cobeldick on 27 May 2019
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
##### 2 CommentsShowHide 1 older comment
Najmeh Eskandari on 14 Jan 2019
this is complete error message:
Error using horzcat
Dimensions of arrays being concatenated are not consistent.
Error in melanie_ode_fj (line 14)
c_m=[.635 .3133 -4+t]';
c_m is a vector (3 by 1) and it is correct.
if the error relates to dimension of dx or phee?
after running codes and ode i use that command (previous post) in command window to get phee and plot it.
the value of phee changes with time and is defined in "corrective control.m".

Star Strider on 14 Jan 2019
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!
Stephen Cobeldick on 27 May 2019
One nargout would be simpler, rather than duplicating an entire function.

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