Returns the lognormal distribution of x, where ln(x) is normally distributed with the specified parameters.
| Name | Type | Description |
| arg1 | number | The value at which to evaluate the function, a positive number. |
| arg2 | number | The mean of ln(x). |
| arg3 | number | The standard deviation of ln(x), a positive number. |
| arg4 | boolean | A logical value (true or false) that determines the function form. If it is true, the function returns the cumulative distribution function. If it is false, the function returns the probability density function. |