# %%
# ======================================================================================
# Copyright (©) 2014-2026 Laboratoire Catalyse et Spectrochimie (LCS), Caen, France.
# CeCILL-B FREE SOFTWARE LICENSE AGREEMENT
# See full LICENSE agreement in the root directory.
# ======================================================================================
# ruff: noqa
"""
Exponential window multiplication
=================================

In this example, we perform exponential window multiplication to apodize a NMR signal in the time domain.

"""

# %%
import spectrochempy as scp

Hz = scp.ur.Hz
us = scp.ur.us

path = scp.preferences.datadir / "nmrdata" / "bruker" / "tests" / "nmr" / "topspin_1d"
dataset1D = scp.read_topspin(path, expno=1, remove_digital_filter=True)

# %%
# Normalize the dataset values and reduce the time domain
dataset1D /= dataset1D.real.data.max()  # normalize
dataset1D = dataset1D[0.0:15000.0]

# %%
# Apply exponential window apodization
new1, curve1 = scp.em(dataset1D.copy(), lb=20 * Hz, retapod=True, inplace=False)

# %%
# Apply a shifted exponential window apodization
# default units are HZ for broadening and microseconds for shifting
new2, curve2 = dataset1D.copy().em(
    lb=100 * Hz, shifted=10000 * us, retapod=True, inplace=False
)

# %%
# Plotting
dataset1D.plot(zlim=(-2, 2), color="k")
curve1.plot(color="r")
new1.plot(color="r", clear=False, label=" em = 20 hz")
curve2.plot(color="b", clear=False)
new2.plot(dcolor="b", clear=False, label=" em = 30 HZ, shifted = ")

# %%
# This ends the example ! The following line can be uncommented if no plot shows when
# running the .py script with python
# scp.show()

# %%
# sphinx_gallery_thumbnail_number = -1