Implementation of summation Matlab

Hello! I have given a function , where a is a vector with n(n between 1 and 10) varaibles, e is the Eulerian number and x is a vector with 10 random values. I should now compute the following sum: , where y is also a vector with 10 random values. Can anyone help me to implement that please?

I have written this:

t=symsum((transpose(a(:)).*cos((1:n).*X(j)*e)-Y(j)).^2,j,1,11)

but it says this error: Array indices must be positive integers or logical values. The error is because one variable in my vector a is negative.

[KSSV]

Why to use symsum when all the variables are known?

[Franzi]

I don't know, what should I use instead? only sum?

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Ameer Hamza]

Try this

a = 1:10;
x = rand(1, 10);
y = rand(1, 10);
e = 1;

z = sum(a(:).*cos((1:numel(a)).'*x(:).'*e)-y(:).', 'all')

[Ameer Hamza]

Which release of MATLAB are you using?

[Franzi]

Matlab R2020a

[Ameer Hamza]

Can you show your code, which causes this error?

[Ameer Hamza]

What are the dimensions of a, x, y and e at this line? Or better, can you gives their values?

[Ameer Hamza]

The problem happened because I assumed x and y are row matrices, whereas they can be column matrix too. I have modified my answer to work with both cases.

[Franzi]

thank you, it works now! :-)

[Ameer Hamza]

I am glad to be of help!