def dirint(ghi, solar_zenith, times, pressure=<NUM_LIT>, use_delta_kt_prime=True,<EOL>temp_dew=None, min_cos_zenith=<NUM_LIT>, max_zenith=<NUM_LIT>):
disc_out = disc(ghi, solar_zenith, times, pressure=pressure,<EOL>min_cos_zenith=min_cos_zenith, max_zenith=max_zenith)<EOL>airmass = disc_out['<STR_LIT>']<EOL>kt = disc_out['<STR_LIT>']<EOL>kt_prime = clearness_index_zenith_independent(<EOL>kt, airmass, max_clearness_index=<NUM_LIT:1>)<EOL>delta_kt_prime = _delta_kt_prime_dirint(kt_prime, use_delta_kt_prime,<EOL>times)<EOL>w = _temp_dew_dirint(temp_dew, times)<EOL>dirint_coeffs = _dirint_coeffs(times, kt_prime, solar_zenith, w,<EOL>delta_kt_prime)<EOL>dni = disc_out['<STR_LIT>'] * dirint_coeffs<EOL>return dni<EOL>
Determine DNI from GHI using the DIRINT modification of the DISC
model.

Implements the modified DISC model known as "DIRINT" introduced in
[1]. DIRINT predicts direct normal irradiance (DNI) from measured
global horizontal irradiance (GHI). DIRINT improves upon the DISC
model by using time-series GHI data and dew point temperature
information. The effectiveness of the DIRINT model improves with
each piece of information provided.

The pvlib implementation limits the clearness index to 1.

Parameters
----------
ghi : array-like
    Global horizontal irradiance in W/m^2.

solar_zenith : array-like
    True (not refraction-corrected) solar_zenith angles in decimal
    degrees.

times : DatetimeIndex

pressure : float or array-like, default 101325.0
    The site pressure in Pascal. Pressure may be measured or an
    average pressure may be calculated from site altitude.

use_delta_kt_prime : bool, default True
    If True, indicates that the stability index delta_kt_prime is
    included in the model. The stability index adjusts the estimated
    DNI in response to dynamics in the time series of GHI. It is
    recommended that delta_kt_prime is not used if the time between
    GHI points is 1.5 hours or greater. If use_delta_kt_prime=True,
    input data must be Series.

temp_dew : None, float, or array-like, default None
    Surface dew point temperatures, in degrees C. Values of temp_dew
    may be numeric or NaN. Any single time period point with a
    temp_dew=NaN does not have dew point improvements applied. If
    temp_dew is not provided, then dew point improvements are not
    applied.

min_cos_zenith : numeric, default 0.065
    Minimum value of cos(zenith) to allow when calculating global
    clearness index `kt`. Equivalent to zenith = 86.273 degrees.

max_zenith : numeric, default 87
    Maximum value of zenith to allow in DNI calculation. DNI will be
    set to 0 for times with zenith values greater than `max_zenith`.

Returns
-------
dni : array-like
    The modeled direct normal irradiance in W/m^2 provided by the
    DIRINT model.

Notes
-----
DIRINT model requires time series data (ie. one of the inputs must
be a vector of length > 2).

References
----------
[1] Perez, R., P. Ineichen, E. Maxwell, R. Seals and A. Zelenka,
(1992). "Dynamic Global-to-Direct Irradiance Conversion Models".
ASHRAE Transactions-Research Series, pp. 354-369

[2] Maxwell, E. L., "A Quasi-Physical Model for Converting Hourly
Global Horizontal to Direct Normal Insolation", Technical Report No.
SERI/TR-215-3087, Golden, CO: Solar Energy Research Institute, 1987.