How can I fix this?

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Eduardo Gallegos
Eduardo Gallegos on 25 Oct 2022
Commented: dpb on 25 Oct 2022
clear all; close all; clc; format compact
x1 = 2
sqrt = sqrt(x1)
x2 = sqrt^2
y1 = 3
st = sqrt(y1)
y2 = st1^2
Index exceeds the number of array elements. Index must not exceed 1.
Error in Debugging_7_Eduardo_Gallegos (line 6)
st = sqrt(y1)
I'm not sure what to do to fix this error

Accepted Answer

dpb
dpb on 25 Oct 2022
Edited: dpb on 25 Oct 2022
Don't alias the builtin sqrt function by assign a value to it and thereby turning the reference to sqrt into a variable.
sqrt = sqrt(x1)
just wiped out the function of the same name by hiding it behind the variable of the same name.
x1 = 2;
sqr_x = sqrt(x1);
x2 = sqr_x^2;
...
will save your bacon.
MORAL: Don't EVER use a builtin function name as a variable!!!
NOTA BENE: You'll then need to
clear sqrt
to rid the workspace of the variable before going on...your first line I didn't put into the code will do the deed as well, but is way overkill for almost all uses (excepting if the instructor makes it a requirement for grading purposes).
  2 Comments
Eduardo Gallegos
Eduardo Gallegos on 25 Oct 2022
Thank you, I can't believe I didn't think of that.
dpb
dpb on 25 Oct 2022
Don't feel bad...everybody does that at some point or another in their learning curve...and sometimes the most obvious is the hardest to see having made a blunder.

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