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For loop assistance- incorrect data

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Eddy Ramirez
Eddy Ramirez on 14 Nov 2020
Commented: Are Mjaavatten on 16 Nov 2020
Greetings,
I am running the attached files, but I am running into an issue with DATA.s. I would like to get the following data
5.0000 -5.0000 0
3.3333 -3.3333 0
1.6667 -1.6667 0
0 0 0
1.6667 1.6667 0
3.3333 3.3333 0
But instead, my coding is providing the following
5.0000 -5.0000 0
3.3333 -3.3333 0
-1.6667 -1.6667 0
0 0 0
1.6667 1.6667 0
3.3333 3.3333 0
I cant figure it out as to why I am getting a negative (-1.6667) on the first columnt/third row
any feedback would be greatly appreciated it
  2 Comments
Eddy Ramirez
Eddy Ramirez on 14 Nov 2020
I am using the debugger and that is how I was able to find the mistake ... thank you for your feedback

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Answers (1)

Are Mjaavatten
Are Mjaavatten on 15 Nov 2020
You give DATA.s(3,1) the desired value in line 8 of exec2w. Then you overwrite it with the wrong value in line 22.
I found debugging your code confusing at first. This was caused by your declaration of DATA as global. The use of global variables is generally discouraged in Matlab, as they tend to lead to confusing effects. In this case the confusion stemmed from the fact that global variables survive the 'clear' command, so I struggled a bit with finding which function actually set the values. ('clear all' does the trick, it turns out.)
Your code runs exactly the same if you delete all 'global DATA' commands, as DATA is transferred in the function calls.
  2 Comments
Are Mjaavatten
Are Mjaavatten on 16 Nov 2020
Type "clear all" in the command window before calling exex2w.
If you avoid the unnecessary global declarations you will not need the "clear all" any more. At least not in this context.

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