How can I fix my function?

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Matlab Student 2021-9-19

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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)

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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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Answer 1

Wan Ji 2021-9-20

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在 MATLAB Online 中打开

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

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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 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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