Matlab spring equation question

Can someone please help me with the following question?

The force required to compress a linear spring is given by the equation;

where F is the force in newtons, k is the spring constant in newtons per meter and x is displacement. Write a program which will determine the compression of each spring for a given set of forces F and corresponding spring constants k. Use function round() to round the n-th element in the answer vector only.

For example:

TestResult

F = [20 30 80];

k = [20 10 20];

n_th = 2;

Result =

3

[KSSV]

You have to use

F = k*x 

right? F, k is given.

[Liam Bouchereau]

F = k*x doesn't work because x is undefined

I tried

x = F/k;

disp(round(x));

but am unsure how to round to the n_th element

Answer 1

[maiaL]

The way I understand the problem, you need an array "x" as the result of this program, which will have the same size as the arrays F and k. For that, I would use an element-wise division here:

x = F./k;

For the rounding part, I believe you'd need to use the round() function with a 2nd argument, like so:

x = round(x,n_th);