mapleFU commented on issue #38370:
URL: https://github.com/apache/arrow/issues/38370#issuecomment-1774061493
Would code like below helps?
```c++
arrow::Datum avg_return;
arrow::Datum avg_std;
double daily_sharpe_ratio;
// 创建 Arrow Double 标量
double days_of_year_double = 252.0;
double sqrt_year = std::sqrt(days_of_year_double);
ARROW_ASSIGN_OR_RAISE(avg_return, arrow::compute::CallFunction(
"mean", {fund_returns}));
arrow::compute::VarianceOptions variance_options;
variance_options.ddof = 1;
ARROW_ASSIGN_OR_RAISE(avg_std, arrow::compute::CallFunction(
"stddev",
{fund_returns},&variance_options));
daily_sharpe_ratio = avg_return.scalar_as<::arrow::DoubleScalar>().value /
avg_std.scalar_as<::arrow::DoubleScalar>().value;
std::cout << "计算得到的夏普率为 : " << daily_sharpe_ratio / sqrt_year << std::endl;
auto end_time = std::chrono::high_resolution_clock::now();
auto duration =
std::chrono::duration_cast<std::chrono::microseconds>(end_time - start_time);
std::cout << "c++读取数据,然后计算夏普率一共耗费时间为: " << duration.count()/1000.0 << "
ms" << std::endl;
return arrow::Status::OK();
```
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