new Ones(x_len, y_len)
    make a matrix filled with ones
    Parameters:
| Name | Type | Description | 
|---|---|---|
| x_len | int | the number of columns. | 
| y_len | int | the number of rows | 
- Source:
| Name | Type | Description | 
|---|---|---|
| x_len | int | the number of columns. | 
| y_len | int | the number of rows |