Function that squares each elemnt of a matrix
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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
end
but i dont really understand or know how to put in the function and what re the variables.
Thanks for any help.
回答（2 个）
Peng Li
2020-3-26
0 个投票
If you only want to square each element of a matrix, you use .^
For example:
A = randn(100, 100);
B = A.^2;
4 个评论
Peng Li
2020-3-26
meaning you don't need a seperate function to do this.
Norty
2020-3-27
Peng Li
2020-3-27
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
Harsh
2021-10-18
0 个投票
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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