How to square each element of a vector

Question

Daniel 2012-1-31

5
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/27627-how-to-square-each-element-of-a-vector

编辑： John D'Errico 2023-3-12

Hello everybody I have a very simple problem, but I don't know how to solve it.

I want to create a row vector from a certain range between two limits. So, given the limits 'a' and 'b', I do: x = [a:0.1:b] %I obtain a vector with equally spaced values between 'a' and 'b', with a 0.10 step.

The problem is that now, I need to elevate each value of 'x' to square, and so, obtain a new vector, let's say 'y', that will contain the values of 'x' squared. How do I do this???

Example: x = [0:1:4] ans = 0 1 2 3 4

I need y to be: 0 1 4 9 16

Thanks everyone!

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Mohammed Alkhatib 2015-10-20

y = x.^2;

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Answer 1

Dr. Seis 2012-1-31

17
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/27627-how-to-square-each-element-of-a-vector#answer_35865

在 MATLAB Online 中打开

y = x.^2;

Using the "." will effectively perform element-by-element mathematical operations. So if you had 2 MxM matrices, say A and B, then:

C = A*B;

Would yield normal matrix multiplication, while:

C = A.*B;

Would yield element-by-element multiplication of both matrices.

See example below:

>> A = eye(2)
A =
     1     0
     0     1
>> B = rand(2)
B =
    0.9594    0.1745
    0.9917    0.9862
>> A*B
ans =
    0.9594    0.1745
    0.9917    0.9862
>> A.*B
ans =
    0.9594         0
         0    0.9862

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Answer 2

the cyclist 2012-1-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/27627-how-to-square-each-element-of-a-vector#answer_35866

在 MATLAB Online 中打开

y = x.^2;

If you don't need the intermediate variable x, then you could simply have done

y = (a:0.1:b).^2;

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Answer 3

Jabir Mumtaz 2018-5-30

2
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https://ww2.mathworks.cn/matlabcentral/answers/27627-how-to-square-each-element-of-a-vector#answer_322457

y=x.^2;

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Answer 4

Saurabh Palve 2020-1-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/27627-how-to-square-each-element-of-a-vector#answer_411557

x=[2 5 1 6]^2

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Kyle Delaney 2020-12-20

You forgot the dot

John D'Errico 2023-3-12

编辑：John D'Errico 2023-3-12

For any newbies who might see this question, of the many answers I see here, all the others are correct, but this answer by @Saurabh Palve is not correct in MATLAB. Without a dot in that operator, that line will fail.

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