Problem in root while compiling a macro

ROOT
1

error: variable length array declaration not allowed at file scope
Double_t x[n], y[n];

2 
Double_t *x = new Double_t[n];
Double_t *y = new Double_t[n];
// ...
delete [] y; // cleanup
delete [] x; // cleanup
3

C++ does not allow such arrays that way if n can change. If n never changes, you can just declare it as const, i.e.

const Int_t n = 5;
Double_t x[n], y[n];
4 
#include <array>
// ...
std::array<Double_t, n> x, y;

http://www.cplusplus.com/reference/array/array/

5

Thank you very much.
It is working.

6

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