Short python script to read ngspice raw binary files
# MIT license: https://opensource.org/licenses/MIT | |
# See https://github.com/Isotel/mixedsim/blob/master/python/ngspice_read.py | |
# for a more complete library. Isotel's version is GPL licensed | |
from __future__ import division | |
import numpy as np | |
BSIZE_SP = 512 # Max size of a line of data; we don't want to read the | |
# whole file to find a line, in case file does not have | |
# expected structure. | |
MDATA_LIST = [b'title', b'date', b'plotname', b'flags', b'no. variables', | |
b'no. points', b'dimensions', b'command', b'option'] | |
def rawread(fname: str): | |
"""Read ngspice binary raw files. Return tuple of the data, and the | |
plot metadata. The dtype of the data contains field names. This is | |
not very robust yet, and only supports ngspice. | |
>>> darr, mdata = rawread('test.py') | |
>>> darr.dtype.names | |
>>> plot(np.real(darr['frequency']), np.abs(darr['v(out)'])) | |
""" | |
# Example header of raw file | |
# Title: rc band pass example circuit | |
# Date: Sun Feb 21 11:29:14 2016 | |
# Plotname: AC Analysis | |
# Flags: complex | |
# No. Variables: 3 | |
# No. Points: 41 | |
# Variables: | |
# 0 frequency frequency grid=3 | |
# 1 v(out) voltage | |
# 2 v(in) voltage | |
# Binary: | |
fp = open(fname, 'rb') | |
plot = {} | |
count = 0 | |
arrs = [] | |
plots = [] | |
while (True): | |
try: | |
mdata = fp.readline(BSIZE_SP).split(b':', maxsplit=1) | |
except: | |
raise | |
if len(mdata) == 2: | |
if mdata[0].lower() in MDATA_LIST: | |
plot[mdata[0].lower()] = mdata[1].strip() | |
if mdata[0].lower() == b'variables': | |
nvars = int(plot[b'no. variables']) | |
npoints = int(plot[b'no. points']) | |
plot['varnames'] = [] | |
plot['varunits'] = [] | |
for varn in range(nvars): | |
varspec = (fp.readline(BSIZE_SP).strip() | |
.decode('ascii').split()) | |
assert(varn == int(varspec[0])) | |
plot['varnames'].append(varspec[1]) | |
plot['varunits'].append(varspec[2]) | |
if mdata[0].lower() == b'binary': | |
rowdtype = np.dtype({'names': plot['varnames'], | |
'formats': [np.complex_ if b'complex' | |
in plot[b'flags'] | |
else np.float_]*nvars}) | |
# We should have all the metadata by now | |
arrs.append(np.fromfile(fp, dtype=rowdtype, count=npoints)) | |
plots.append(plot) | |
fp.readline() # Read to the end of line | |
else: | |
break | |
return (arrs, plots) | |
if __name__ == '__main__': | |
arrs, plots = rawread('test.raw') | |
print(darr) | |
# Local Variables: | |
# mode: python | |
# End: |
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@Wallflower123, I'm not sure what you're trying to do and what your error is. It works for my original purpose. |
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@snmishra I am trying to read my NgSpice raw files with a python script. When using this function I get empty arrays... |
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@Wallflower123 I'm sorry I can't debug without some indication of the error. Please give me a test file and the actual error message. |
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Hello,
This function does not run for me....