How to resolve an error message: Unrecognized function or variable

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I always get an error of Unrecognized function 'DA' when I run the code for the first time.
The error disappears in subsequent runs. What could be the reason.
see a sample of the code.
%% ENTER DATE, MONTH, YEAR AND HOUR
DA.Day = 1;
DA.Month = 06;
DA.Year = 2021;
DA.tLST = 7;
DA.ls = 60;
[tim, yprime] = Balloondynamics(dtspan,In0,wind, DA, I, B);
  5 Commenti
Telema Harry
Telema Harry il 13 Ago 2021
I have seen the bug. It took a while but I was able to find it.
after the DA variable, I called another file to load weather data.
That file clears all the previous variables using the function: clearvars -except data
In the next attempt, the program uses the stored 'data' and it is not runing the weather data file again.
Problem solved. Thanks
Rik
Rik il 14 Ago 2021
That sounds like you just learned why functions are useful.

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