How to resolve an error message: Unrecognized function or variable

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Telema Harry 2021-8-13

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评论： Rik 2021-8-14

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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);
     
 

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Telema Harry 2021-8-13

Thank you for the feedback @Image Analyst @Walter Roberson @Sulaymon Eshkabilov.

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 2021-8-14

That sounds like you just learned why functions are useful.

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