Perfect Square in Matlab

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Zaid
Zaid on 4 Jul 2022
Edited: Siraj on 4 Jul 2022
What is the most efficient way to check wether a number is a perfect square or not in matlab. Perfect square are 4,9,16 and so on

Accepted Answer

Siraj
Siraj on 4 Jul 2022
Edited: Siraj on 4 Jul 2022
Hi,
It is my understanding that you want to know the easiest way to find whether a number is a perfect square or not.
For this first you can take the square root of the number and then see if the square root is a proper integer or not. We know that any integer when divided by one leaves zero as the remainder, therefore we can use the “modulo” function to find the remainder of the square root when divided by one and if the remainder is zero means that the number is a perfect square.
Refer to the documentation for more on modulo function in MATLAB.
n = 49;
%take the square root
sq_rt = sqrt(n);
% now check if the sq_rt is a proper integer or not
int_or_not = mod(sq_rt,1);
if(int_or_not == 0)
disp("Prefect Square");
else
disp("Not a Perfect Square");
end
Prefect Square

More Answers (3)

Chunru
Chunru on 4 Jul 2022
x = (1:20);
mod(sqrt(x), 1) == 0
ans = 1×20 logical array
1 0 0 1 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0

Karan Kannoujiya
Karan Kannoujiya on 4 Jul 2022
Hi Zaid,
You can use below code to check for a perfect square-->
%num---> number you want to check
y=sqrt(num);
z=ceil(y);
if(z==y)
disp('The number is perfect square number');
else
disp('The number is not a perfect square number');
end

Shivam Lahoti
Shivam Lahoti on 4 Jul 2022
you can check for perfect square by using the following check, however representable number might sparse if n is large enough.
if floor(sqrt(n)).^2 == n

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