Make a function accept vector

Asked by Tim on 12 Mar 2018

Latest activity Answered by KL on 12 Mar 2018

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Hello, I am trying that this function below accepts vector inputs, but it doesnt want to work.

function y = myfunction(x)

y=x*(exp(x*(-0.7)))*sqrt(2*x^2+1)

end

I tried to replace the x* with x.*, but it wont work either. Maybe I am calling it wrong? myfunction(5) works, but myfunction([5 2]) does not.

Thanks in advance!

1 Comment

Tim on 12 Mar 2018

ah i did it. its function y = myfunction(x)

y=x.*(exp(x.*(-0.7))).*sqrt((x.^2)*2+1)

end

1 Answer

Link

Answer by KL on 12 Mar 2018

This is called the element-wise operation. When you write x^2, MATLAB tries to find x*x but when you write x.^2, it calculates square of every element.

>> x = 1:3;
>> x^2
Error using  ^ 
Inputs must be a scalar and a square matrix.
To compute elementwise POWER, use POWER (.^) instead.
>> x.^2
ans =
     1     4     9

more on this link: https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

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