# Matlab spring equation question

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Liam Bouchereau 2020 年 10 月 27 日

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
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Liam Bouchereau 2020 年 10 月 27 日
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

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### 回答 (1 件)

maiaL 2020 年 10 月 27 日

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);

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