Function that squares each elemnt of a matrix

Question

Norty 2020-3-26

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回答： harsh raval 2021-10-18

Hi everyone,

I´m strugling with writing a function that is suppose to square each element of my matrix. I tried doing it through vector and then reshaping it, but couldn´t quite hit the correct code. My problem is that i figured out a part of the code but can´t really put it all together since im new to mathlab.

Having matrix n x m then

for 1:n

for 1:m

x.^2

end

but i dont really understand or know how to put in the function and what re the variables.

Thanks for any help.

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Torsten 2020-3-26

You don't need the for-loops above.

If A is a matrix of arbitrary size, then A.^2 is the matrix with all entries squared.

Can you take it from here ?

Norty 2020-3-27

I would. But I forgot to add, that its a excercise, where i have to write a loop function for squaring each element of matrix.

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Answer 1

Peng Li 2020-3-26

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If you only want to square each element of a matrix, you use .^

For example:

A = randn(100, 100);

B = A.^2;

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Peng Li 2020-3-27

在 MATLAB Online 中打开

function A2 = myElementSquare(A)
A2 = nan(size(A)); % this pre-allocation speeds up the loop
for iR = 1:size(A, 1)
    for iC = 1:size(A, 2)
        A2(iR, iC) = A(iR, iC) .^ 2;
    end
end
end

save above script as a function file. you can call this function by

Res = myElementSquare(anyNumericMatrix);

for example:

test  = randn(100, 100);
test2 = myElementSquare(test);

Norty 2020-3-27

works just perfectly, Thank you very much, now i understand what i needed!

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Answer 2

harsh raval 2021-10-18

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a=[1 2; 3 4]

squa1=a^2

squa2=a.^2

squa1 =

7 10

15 22

squa2 =

1 4

9 16

so, for traditional square of the matrix use a^2

but, for square of each element use a.^2

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