How can I fix my function?

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Matlab Student
Matlab Student 2021-9-19
评论： Walter Roberson 2021-9-22
Hi, I'm new to Matlab and have a lot of difficulty understanding how to properly write functions. I need to write a function ispythag that will recieve three positive integers (a,b,c) that will return a logical 1 if they form a pythagorean triple, or logical 0 if they don't. I also cannot use if or select statements.This is the code I have written but I always get an error saying unrecognized function or variable 'a', however when I write a script using this code and write "ispythag(1,2,3)" or "ispythag(3,4,5)" in the command prompt, I get the logical answers I need. After several attempts at changing my code without success, I was hoping someone might be able to lend me some guidance. Thank you very much for your time and help!
Ptriple = ispythag(a,b,c)
Ptriple = a^2+b^2 == c^2;
ispythag(1,2,3)
ispythag(3,4,5)
  1 个评论
Cris LaPierre
Cris LaPierre 2021-9-20
You have not property declared your function. See this page for help with that. It also contains some working examples that you can modify to get your function started.
https://www.mathworks.com/help/matlab/ref/function.html

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Wan Ji
Wan Ji 2021-9-20
Hey， friend
Just try the inline function
ispythag = @(a,b,c)a.^2+b.^2 == c.^2;
a = ispythag(1,2,3)
b = ispythag(3,4,5)
Then you will obtain the result
a =
logical
0
b =
logical
1
  2 个评论
Matlab Student
Matlab Student 2021-9-22
Thank you ver much for your help. Just a quick follow up question, why do i need to include the '@' in the function?
Walter Roberson
Walter Roberson 2021-9-22
The correct term for this in MATLAB is "anonymous function". It is documented at https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html
MATLAB does have "inline" functions as well, which are not recommended; they are an older technology that has a number of drawbacks compared to anonymous functions.

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