Create a vector x with the elements

Create a vector x with the elements x = (-1^n + 1/2*n -1 ) Add up the elements of the version of this vector that has 100 elements.

Can someone tell me how to do it?

[Walter Roberson]

Is that (-1)^n ? Does the 1/2 apply to n or to (n-1) ? Is n a constant, or does it represent the index of the element? If it represents the index, should n start at 0 or at 1 ?

[the cyclist]

If this is class homework, please say so and describe what you have tried on your own.

Answer 1

[Davide Ferraro]

You can use vector operations on the vector n with elements from 1 to 100:

x = (-1.^n + 1/2*n -1);

to create the x vector.

If you need to sum every element you can then use the SUM command:

sum(x)

Answer 2

[Barnali]

n = 1:100; 
x = ((-1).^(n+1))./(2*n-1);
sum(x)

ans = 0.7829

[SIBUNABIRWA]

It is working out. Thank you very much