/// <summary>
/// 执行Get操作
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="target"></param>
/// <returns></returns>
protected Result <T> Wrap <T>(WrapDelegate <T> target)
{
var result = new Result <T>();
try
{
T entity = target();
result.Code = null == entity ? ResultCode.Error : ResultCode.Success;
result.Message = result.Code == ResultCode.Success ? "" : "操作失败";
result.Data = entity;
}
catch (Exception ex)
{
result.Code = ResultCode.Error;
result.Message = "系统异常!" + ex.Message;
}
return(result);
}
/// <summary>
/// Create a two-dimensional array with the flattened input as a diagonal.
/// </summary>
/// <param name="v">Input data</param>
/// <param name="k">Diagonal to set; 0, the default, corresponds to the "main" diagonal, a positive(negative) `k` giving the number of the diagonal above (below) the main.</param>
/// <returns></returns>
public static ndarray diagflat(ndarray v, int k = 0)
{
/*
* Create a two-dimensional array with the flattened input as a diagonal.
*
* Parameters
* ----------
* v : array_like
* Input data, which is flattened and set as the `k`-th
* diagonal of the output.
* k : int, optional
* Diagonal to set; 0, the default, corresponds to the "main" diagonal,
* a positive (negative) `k` giving the number of the diagonal above
* (below) the main.
*
* Returns
* -------
* out : ndarray
* The 2-D output array.
*
* See Also
* --------
* diag : MATLAB work-alike for 1-D and 2-D arrays.
* diagonal : Return specified diagonals.
* trace : Sum along diagonals.
*
* Examples
* --------
* >>> np.diagflat([[1,2], [3,4]])
* array([[1, 0, 0, 0],
* [0, 2, 0, 0],
* [0, 0, 3, 0],
* [0, 0, 0, 4]])
*
* >>> np.diagflat([1,2], 1)
* array([[0, 1, 0],
* [0, 0, 2],
* [0, 0, 0]])
*/
ndarray fi;
WrapDelegate wrap = null;
v = asarray(v).ravel();
int s = len(v);
int n = s + Math.Abs(k);
ndarray res = zeros(new shape(n, n), dtype: v.Dtype);
if (k >= 0)
{
ndarray i = arange(0, n - k, null, null);
fi = i + k + i * n;
}
else
{
ndarray i = arange(0, n + k, null, null);
fi = i + (i - k) * n;
}
res.Flat[fi] = v;
if (wrap == null)
{
return(res);
}
return(wrap(res));
}