add support for minute and hourly time step for bootstrapping

fixes #9

include/evalhyd/detail/uncertainty.hpp

@@ -105,8 +105,41 @@ namespace evalhyd
                         (x_timepoints >= start) && (x_timepoints < end);
 
                 // check that year is complete (without a rigorous leap year check)
-                int n_days = xt::sum(wdw)();
-                if ((n_days != 365) && (n_days != 366))
+                bool complete_yr = true;
+                if (std::chrono::minutes(ti).count() == 1)
+                {
+                    // minute timestep
+                    int n_minutes = xt::sum(wdw)();
+                    if ((n_minutes != 60 * 24 * 365) && (n_minutes != 60 * 24 * 366))
+                    {
+                        complete_yr = false;
+                    }
+                }
+                else if (std::chrono::minutes(ti).count() == 60)
+                {
+                    // hourly timestep
+                    int n_hours = xt::sum(wdw)();
+                    if ((n_hours != 24 * 365) && (n_hours != 24 * 366))
+                    {
+                        complete_yr = false;
+                    }
+                }
+                else if (std::chrono::minutes(ti).count() == 60 * 24)
+                {
+                    // daily timestep
+                    int n_days = xt::sum(wdw)();
+                    if ((n_days != 365) && (n_days != 366))
+                    {
+                        complete_yr = false;
+                    }
+                }
+                else
+                {
+                    throw std::runtime_error(
+                            "time step must be minute, hourly, or daily"
+                    );
+                }
+                if (!complete_yr)
                 {
                     throw std::runtime_error(
                             "year starting in " + std::to_string(y - 400)

include/evalhyd/evald.hpp

@@ -132,7 +132,9 @@ namespace evalhyd
     ///       The date and time must be specified in a string following the
     ///       ISO 8601-1:2019 standard, i.e. "YYYY-MM-DD hh:mm:ss" (e.g. the
     ///       21st of May 2007 at 4 in the afternoon is "2007-05-21 16:00:00").
-    ///       If provided, it is only used if *bootstrap* is also provided.
+    ///       The time series must feature complete years. Only minute, hourly,
+    ///       and daily time steps are supported. If provided, it is only used
+    ///       if *bootstrap* is also provided.
     ///
     ///    seed: ``int``, optional
     ///       A value for the seed used by random generators. This parameter

include/evalhyd/evalp.hpp

@@ -123,7 +123,9 @@ namespace evalhyd
     ///       The date and time must be specified in a string following the
     ///       ISO 8601-1:2019 standard, i.e. "YYYY-MM-DD hh:mm:ss" (e.g. the
     ///       21st of May 2007 at 4 in the afternoon is "2007-05-21 16:00:00").
-    ///       If provided, it is only used if *bootstrap* is also provided.
+    ///       The time series must feature complete years. Only minute, hourly,
+    ///       and daily time steps are supported. If provided, it is only used
+    ///       if *bootstrap* is also provided.
     ///
     ///    seed: ``int``, optional
     ///       A value for the seed used by random generators. This parameter