# Scenario/validate

> Validate a Scenario object

---

## Description
Validate the properties of a Scenario object to ensure that they meet the required conditions. If all the conditions are satisfied, the function returns a Scenario object with `valid = true`. If not, corresponding error message is raised.

## Syntax
```matlab
scenario = validate(scenario)
scenario = scenario.validate()
```
## Input Arguments
| Name | Type | Description |
|------|------|--------------|
| `scenario` | *Scenario object* | Scenario object to be validated |

## Output Arguments
| Name | Type | Description |
|------|------|--------------|
| `scenario` | *Scenario object* | Validated Scenario object |

## Required conditions
For a Scenario object to be valid, the following conditions must be satisfied.

### EVs
* If `EVs` is nonempty, each EV object in it must be valid. (SEE ALSO EV OR EV.VALIDATE)
### Compatibility
* If `Problem_type == "Lf"`, then `D` must be nonempty.
* If `Problem_type == "Uf"`, then `C` must be nonempty.
* `N_c` must be greater than or equal to the maximum value of `Charger_ind` of EV objects in `EVs`.
* `N_ev` must be equal to the length of `EVs`
* `N_g` must be greater than or equal to the maximum value of `Group_ind` of EV objects in `EVs`.
* For EV objects in `EVs` with same `Charger_ind` value, their occupancy must not overlap, i.e., vectors `Arr_time:(Dep_time-1)` must not have common elements.
### Dimension
* If nonempty, length of `D` must be `T`.
* If nonempty, length of `C` must be `T`.
* If nonempty, size of `L` must be `(N_c+1)×(N_c+1)`.
* If nonempty, size of `W` must be `N_c×N_c`.
### Graph-related
* If nonempty, `L` must be a symmetric matrix with zero row sums and nonnegative diagonal elements.
* If nonempty, `W` must be a symmetric stochastic matrix.