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can anyone find the error?

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Accepted Answer

Sindar on 23 Oct 2020
Perhaps you are calling the function with two few arguments, such as this on the command line:
If you are simply hitting the "Run" button, then the program assumes no inputs at all, and b happens to be the first one it comes across.
Neither of these are bugs in the code, simply incorrect usage. If you want to prevent this, define defaults:
function quadraticc(a,b,c)
a (1,1) double = 1
b (1,1) double = 0
c (1,1) double = 0
Sindar on 24 Oct 2020
you aren't calculating r when k<0, but you still try to display it

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More Answers (1)

KSSV on 23 Oct 2020
Edited: KSSV on 23 Oct 2020
Save the function in a folder...and :
a = 1 ;
b = 2 ;
c = 3 ; % define your variables

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