3_different_variables.py

import badcrossbar

# The main purpose of the plotting module is for plotting currents and voltages
# in the branches and on the nodes of the crossbar, respectively. However,
# these functions can accept any numeric arrays and thus plot arbitrary
# variables. This example shows how to plot the percentage change in current
# in every branch, due to introduced line resistance.

# Applied voltages in volts.
applied_voltages = [
    [1.5],
    [2.3],
    [1.7],
]

# Device resistances in ohms.
resistances = [
    [345, 903, 755, 257, 646],
    [652, 401, 508, 166, 454],
    [442, 874, 190, 244, 635],
]

# Interconnect resistance in ohms (different for word and bit line segments).
r_i_ideal = {"word_line": 0, "bit_line": 0}
r_i_nonideal = {"word_line": 0.75, "bit_line": 0.5}

# Computing the solution.
solution_ideal = badcrossbar.compute(
    applied_voltages,
    resistances,
    verbose=0,
    r_i_word_line=r_i_ideal["word_line"],
    r_i_bit_line=r_i_ideal["bit_line"],
)
solution_nonideal = badcrossbar.compute(
    applied_voltages,
    resistances,
    verbose=0,
    r_i_word_line=r_i_nonideal["word_line"],
    r_i_bit_line=r_i_nonideal["bit_line"],
)

# Extracting the currents.
ideal_currents = solution_ideal.currents
nonideal_currents = solution_nonideal.currents

# Computing percentage changes.
device_change = (nonideal_currents.device - ideal_currents.device) / ideal_currents.device * 100
word_line_change = (
    (nonideal_currents.word_line - ideal_currents.word_line) / ideal_currents.word_line * 100
)
bit_line_change = (
    (nonideal_currents.bit_line - ideal_currents.bit_line) / ideal_currents.bit_line * 100
)

# Plotting percentage changes.
modified_label = "Change in current (%)"
badcrossbar.plot.branches(
    device_vals=device_change,
    word_line_vals=word_line_change,
    bit_line_vals=bit_line_change,
    axis_label=modified_label,
    filename="Ex-3",
    allow_overwrite=True,
)