Related
I'm working on a network using triplet mining for training. In order to make it work properly, I need my batches to contain several images of the same class. The problem I'm currently facing is that I have 751 classes, for a total of 12,937 pictures, and a batch size of 48 pictures. When shuffling the dataset using the command below, the odds to get pictures from the same class are really low, making the triplet mining inefficient.
dataset = dataset.shuffle(12937)
What I would need instead is a way of generating batches that contain a specific number of pictures for every class represented in this batch. As an example, let's say here that I want 12 classes per batch, there would be 4 pictures for each of them.
Another problem I'm facing is how would I shuffle this dataset at the end of every epoch so that I can have different batches that still follow the condition fixed above, that is 12 classes, 4 pictures for each one of them?
Is there any proper way to do it? I can't really find one. Please let me know if I'm unclear, and if you need further details.
================ EDIT ================
I've been trying a few things, and came up with something that would do what I want. The function would be the following:
counter = 0.
# Assuming a format such as (data, label)
def predicate(data, label):
global counter
allowed_labels = tf.constant([counter])
isallowed = tf.equal(allowed_labels, tf.cast(label, tf.float32))
reduced = tf.reduce_sum(tf.cast(isallowed, tf.float32))
counter += 1
return tf.greater(reduced, tf.constant(0.))
##tf.function
def custom_shuffle(train_dataset, batch_size, samples_per_class = 4, iterations_in_epoch = 100, database='market'):
assert batch_size%samples_per_class==0, F'batch size must be a {samples_per_class} multiple.'
if database == 'market':
class_nbr = 751
else:
raise Exception('Unsuported database yet')
all_datasets = [train_dataset.filter(predicate) for _ in range(class_nbr)] # Every element of this array is a dataset of one class
for i in range(iterations_in_epoch):
choice = tf.random.uniform(
shape=(batch_size//samples_per_class,),
minval=0,
maxval=class_nbr,
dtype=tf.dtypes.int64,
) # Which classes will be in batch
choice = tf.data.Dataset.from_tensor_slices(tf.concat([choice for _ in range(4)], axis=0)) # Exactly 4 picture from each class in the batch
batch = tf.data.experimental.choose_from_datasets(all_datasets, choice)
if i==0:
all_batches = batch
else:
all_batches = all_batches.concatenate(batch)
all_batches = all_batches.batch(batch_size)
return all_batches
It does what I want, however the returned dataset is extremely slow to iterate, making modele learning impossible. As per this thread, I understood that I needed to decorate custom_shuffle with #tf.function, as the one commented out. However, when doing so, it raises the following error:
Traceback (most recent call last):
File "training.py", line 137, in <module>
main()
File "training.py", line 80, in main
train_dataset = get_dataset(TRAINING_FILENAMES, IMG_SIZE, BATCH_SIZE, database=database, func_type='train')
File "E:\Morgan\TransReID_TF\tfr_to_dataset.py", line 260, in get_dataset
dataset = custom_shuffle(dataset, batch_size)
File "D:\Programs\Anaconda3\envs\AlignedReID_TF\lib\site-packages\tensorflow\python\eager\def_function.py", line 780, in __call__
result = self._call(*args, **kwds)
File "D:\Programs\Anaconda3\envs\AlignedReID_TF\lib\site-packages\tensorflow\python\eager\def_function.py", line 846, in _call
return self._concrete_stateful_fn._filtered_call(canon_args, canon_kwds) # pylint: disable=protected-access
File "D:\Programs\Anaconda3\envs\AlignedReID_TF\lib\site-packages\tensorflow\python\eager\function.py", line 1843, in _filtered_call
return self._call_flat(
File "D:\Programs\Anaconda3\envs\AlignedReID_TF\lib\site-packages\tensorflow\python\eager\function.py", line 1923, in _call_flat
return self._build_call_outputs(self._inference_function.call(
File "D:\Programs\Anaconda3\envs\AlignedReID_TF\lib\site-packages\tensorflow\python\eager\function.py", line 545, in call
outputs = execute.execute(
File "D:\Programs\Anaconda3\envs\AlignedReID_TF\lib\site-packages\tensorflow\python\eager\execute.py", line 59, in quick_execute
tensors = pywrap_tfe.TFE_Py_Execute(ctx._handle, device_name, op_name,
tensorflow.python.framework.errors_impl.InternalError: No unary variant device copy function found for direction: 1 and Variant type_index: class tensorflow::data::`anonymous namespace'::DatasetVariantWrapper
[[{{node BatchDatasetV2/_206}}]] [Op:__inference_custom_shuffle_11485]
Function call stack:
custom_shuffle
Which I don't understand, and don't see how to fix.
Is there something I'm doing wrong?
PS: I'm aware the lack of minimal code to reproduce this behavior makes it hard to debug, I'll try to provide some as soon as possible.
I am currently trying to crop a retangular xarray file to the shape of a country using a mask grid. Below you can find my current solution (with simpler and smaller arrays). The code works and I get the desired mask based on 1s and 0s. The problem lies on the fact that the code when run on a real country shape (larger and more complex) takes over 30 minutes to run. Since I am using very basic operations here like nested for loops, I also tried different alternatives like a list approach. However, when timing the process, it did not improve on the code below. I wonder if there is a faster way to obtain this mask (vectorization?) or if I should approach the problem in a different way (tried exploring xarray's properties, but have not found anything that tackles this issue yet).
Code below:
import geopandas as gpd
from shapely.geometry import Polygon, Point
import pandas as pd
import numpy as np
import xarray as xr
df = pd.read_csv('Brazil_borders.csv',index_col=0)
lats = np.array([-20, -5, -5, -20,])
lons = np.array([-60, -60, -30, -30])
lats2 = np.array([-10.25, -10.75, -11.25, -11.75, -12.25, -12.75, -13.25, -13.75,
-14.25, -14.75, -15.25, -15.75, -16.25, -16.75, -17.25, -17.75,
-18.25, -18.75, -19.25, -19.75, -20.25, -20.75, -21.25, -21.75,
-22.25, -22.75, -23.25, -23.75, -24.25, -24.75, -25.25, -25.75,
-26.25, -26.75, -27.25, -27.75, -28.25, -28.75, -29.25, -29.75,
-30.25, -30.75, -31.25, -31.75, -32.25, -32.75])
lons2 = np.array([-61.75, -61.25, -60.75, -60.25, -59.75, -59.25, -58.75, -58.25,
-57.75, -57.25, -56.75, -56.25, -55.75, -55.25, -54.75, -54.25,
-53.75, -53.25, -52.75, -52.25, -51.75, -51.25, -50.75, -50.25,
-49.75, -49.25, -48.75, -48.25, -47.75, -47.25, -46.75, -46.25,
-45.75, -45.25, -44.75, -44.25])
points = []
for i in range(len(lats)):
_= [lats[i],lons[i]]
points.append(_)
poly_proj = Polygon(points)
mask = np.zeros((len(lats2),len(lons2))) # Mask with the dataset's shape and size.
for i in range(len(lats2)): # Iteration to verify if a given coordinate is within the polygon's area
for j in range(len(lons2)):
grid_point = Point(lats2[i], lons2[j])
if grid_point.within(poly_proj):
mask[i][j] = 1
bool_final = mask
bool_final
The alternative based on list approach, but with even worse processing time (according to timeit):
lats = np.array([-20, -5, -5, -20,])
lons = np.array([-60, -60, -30, -30])
lats2 = np.array([-10.25, -10.75, -11.25, -11.75, -12.25, -12.75, -13.25, -13.75,
-14.25, -14.75, -15.25, -15.75, -16.25, -16.75, -17.25, -17.75,
-18.25, -18.75, -19.25, -19.75, -20.25, -20.75, -21.25, -21.75,
-22.25, -22.75, -23.25, -23.75, -24.25, -24.75, -25.25, -25.75,
-26.25, -26.75, -27.25, -27.75, -28.25, -28.75, -29.25, -29.75,
-30.25, -30.75, -31.25, -31.75, -32.25, -32.75])
lons2 = np.array([-61.75, -61.25, -60.75, -60.25, -59.75, -59.25, -58.75, -58.25,
-57.75, -57.25, -56.75, -56.25, -55.75, -55.25, -54.75, -54.25,
-53.75, -53.25, -52.75, -52.25, -51.75, -51.25, -50.75, -50.25,
-49.75, -49.25, -48.75, -48.25, -47.75, -47.25, -46.75, -46.25,
-45.75, -45.25, -44.75, -44.25])
points = []
for i in range(len(lats)):
_= [lats[i],lons[i]]
points.append(_)
poly_proj = Polygon(points)
grid_point = [Point(lats2[i],lons2[j]) for i in range(len(lats2)) for j in range(len(lons2))]
mask = [1 if grid_point[i].within(poly_proj) else 0 for i in range(len(grid_point))]
bool_final2 = np.reshape(mask,(((len(lats2)),(len(lons2)))))
Thank you in advance!
Based on this answer from snowman2, I created this simple function that provides a much faster solution by using geopandas and rioxarray. Instead of using a list of latitudes and longitudes, one has to use a shapefile with the desired shape to be masked (Instructions for GeoDataFrame creation from list of coordinates).
import xarray as xr
import geopandas as gpd
import rioxarray
from shapely.geometry import mapping
def mask_shape_border (DS,shape_shp): #Inputs are the dataset to be cropped and the address of the mask file (.shp )
if 'lat' in DS: #Some datasets use lat/lon, others latitude/longitude
DS.rio.set_spatial_dims(x_dim="lon", y_dim="lat", inplace=True)
elif 'latitude' in DS:
DS.rio.set_spatial_dims(x_dim="longitude", y_dim="latitude", inplace=True)
else:
print("Error: check latitude and longitude variable names.")
DS.rio.write_crs("epsg:4326", inplace=True)
mask = gpd.read_file(shape_shp, crs="epsg:4326")
DS_clipped = DS.rio.clip(mask.geometry.apply(mapping), mask.crs, drop=False)
return(DS_clipped)
I have been tasked with making plots of winds at various levels of the atmosphere to support aviation. While I have been able to make some nice plots using GFS model data (see code below), I'm really having to make a rough approximation of height using pressure coordinates available from the GFS. I'm using winds at 300 hPA, 700 hPA, and 925 hPA to make an approximation of the winds at 30,000 ft, 9000 ft, and 3000 ft. My question is really for those out there who are metpy gurus...is there a way that I can interpolate these winds to a height surface? It sure would be nice to get the actual winds at these height levels! Thanks for any light anyone can share on this subject!
import cartopy.crs as ccrs
import cartopy.feature as cfeature
import matplotlib.pyplot as plt
from matplotlib.colors import ListedColormap
import numpy as np
from netCDF4 import num2date
from datetime import datetime, timedelta
from siphon.catalog import TDSCatalog
from siphon.ncss import NCSS
from PIL import Image
from matplotlib import cm
# For the vertical levels we want to grab with our queries
# Levels need to be in Pa not hPa
Levels = [30000,70000,92500]
# Time deltas for days
Deltas = [1,2,3]
#Deltas = [1]
# Levels in hPa for the file names
LevelDict = {30000:'300', 70000:'700', 92500:'925'}
# The path to where our banners are stored
impath = 'C:\\Users\\shell\\Documents\\Python Scripts\\Banners\\'
# Final images saved here
imoutpath = 'C:\\Users\\shell\\Documents\\Python Scripts\\TVImages\\'
# Quick function for finding out which variable is the time variable in the
# netCDF files
def find_time_var(var, time_basename='time'):
for coord_name in var.coordinates.split():
if coord_name.startswith(time_basename):
return coord_name
raise ValueError('No time variable found for ' + var.name)
# Function to grab data at different levels from Siphon
def grabData(level):
query.var = set()
query.variables('u-component_of_wind_isobaric', 'v-component_of_wind_isobaric')
query.vertical_level(level)
data = ncss.get_data(query)
u_wind_var = data.variables['u-component_of_wind_isobaric']
v_wind_var = data.variables['v-component_of_wind_isobaric']
time_var = data.variables[find_time_var(u_wind_var)]
lat_var = data.variables['lat']
lon_var = data.variables['lon']
return u_wind_var, v_wind_var, time_var, lat_var, lon_var
# Construct a TDSCatalog instance pointing to the gfs dataset
best_gfs = TDSCatalog('http://thredds-jetstream.unidata.ucar.edu/thredds/catalog/grib/'
'NCEP/GFS/Global_0p5deg/catalog.xml')
# Pull out the dataset you want to use and look at the access URLs
best_ds = list(best_gfs.datasets.values())[1]
#print(best_ds.access_urls)
# Create NCSS object to access the NetcdfSubset
ncss = NCSS(best_ds.access_urls['NetcdfSubset'])
print(best_ds.access_urls['NetcdfSubset'])
# Looping through the forecast times
for delta in Deltas:
# Create lat/lon box and the time(s) for location you want to get data for
now = datetime.utcnow()
fcst = now + timedelta(days = delta)
timestamp = datetime.strftime(fcst, '%A')
query = ncss.query()
query.lonlat_box(north=78, south=45, east=-90, west=-220).time(fcst)
query.accept('netcdf4')
# Now looping through the levels to create our plots
for level in Levels:
u_wind_var, v_wind_var, time_var, lat_var, lon_var = grabData(level)
# Get actual data values and remove any size 1 dimensions
lat = lat_var[:].squeeze()
lon = lon_var[:].squeeze()
u_wind = u_wind_var[:].squeeze()
v_wind = v_wind_var[:].squeeze()
#converting to knots
u_windkt= u_wind*1.94384
v_windkt= v_wind*1.94384
wspd = np.sqrt(np.power(u_windkt,2)+np.power(v_windkt,2))
# Convert number of hours since the reference time into an actual date
time = num2date(time_var[:].squeeze(), time_var.units)
print (time)
# Combine 1D latitude and longitudes into a 2D grid of locations
lon_2d, lat_2d = np.meshgrid(lon, lat)
# Create new figure
#fig = plt.figure(figsize = (18,12))
fig = plt.figure()
fig.set_size_inches(26.67,15)
datacrs = ccrs.PlateCarree()
plotcrs = ccrs.LambertConformal(central_longitude=-150,
central_latitude=55,
standard_parallels=(30, 60))
# Add the map and set the extent
ax = plt.axes(projection=plotcrs)
ext = ax.set_extent([-195., -115., 50., 72.],datacrs)
ext2 = ax.set_aspect('auto')
ax.background_patch.set_fill(False)
# Add state boundaries to plot
ax.add_feature(cfeature.STATES, edgecolor='black', linewidth=2)
# Add geopolitical boundaries for map reference
ax.add_feature(cfeature.COASTLINE.with_scale('50m'))
ax.add_feature(cfeature.OCEAN.with_scale('50m'))
ax.add_feature(cfeature.LAND.with_scale('50m'),facecolor = '#cc9666', linewidth = 4)
if level == 30000:
spdrng_sped = np.arange(30, 190, 2)
windlvl = 'Jet_Stream'
elif level == 70000:
spdrng_sped = np.arange(20, 100, 1)
windlvl = '9000_Winds_Aloft'
elif level == 92500:
spdrng_sped = np.arange(20, 80, 1)
windlvl = '3000_Winds_Aloft'
else:
pass
top = cm.get_cmap('Greens')
middle = cm.get_cmap('YlOrRd')
bottom = cm.get_cmap('BuPu_r')
newcolors = np.vstack((top(np.linspace(0, 1, 128)),
middle(np.linspace(0, 1, 128))))
newcolors2 = np.vstack((newcolors,bottom(np.linspace(0,1,128))))
cmap = ListedColormap(newcolors2)
cf = ax.contourf(lon_2d, lat_2d, wspd, spdrng_sped, cmap=cmap,
transform=datacrs, extend = 'max', alpha=0.75)
cbar = plt.colorbar(cf, orientation='horizontal', pad=0, aspect=50,
drawedges = 'true')
cbar.ax.tick_params(labelsize=16)
wslice = slice(1, None, 4)
ax.quiver(lon_2d[wslice, wslice], lat_2d[wslice, wslice],
u_windkt[wslice, wslice], v_windkt[wslice, wslice], width=0.0015,
headlength=4, headwidth=3, angles='xy', color='black', transform = datacrs)
plt.savefig(imoutpath+'TV_UpperAir'+LevelDict[level]+'_'+timestamp+'.png',bbox_inches= 'tight')
# Now we use Pillow to overlay the banner with the appropriate day
background = Image.open(imoutpath+'TV_UpperAir'+LevelDict[level]+'_'+timestamp+'.png')
im = Image.open(impath+'Banner_'+windlvl+'_'+timestamp+'.png')
# resize the image
size = background.size
im = im.resize(size,Image.ANTIALIAS)
background.paste(im, (17, 8), im)
background.save(imoutpath+'TV_UpperAir'+LevelDict[level]+'_'+timestamp+'.png','PNG')
Thanks for the question! My approach here is for each separate column to interpolate the pressure coordinate of GFS-output Geopotential Height onto your provided altitudes to estimate the pressure of each height level for each column. Then I can use that pressure to interpolate the GFS-output u, v onto. The GFS-output GPH and winds have very slightly different pressure coordinates, which is why I interpolated twice. I performed the interpolation using MetPy's interpolate.log_interpolate_1d which performs a linear interpolation on the log of the inputs. Here is the code I used!
from datetime import datetime
import numpy as np
import metpy.calc as mpcalc
from metpy.units import units
from metpy.interpolate import log_interpolate_1d
from siphon.catalog import TDSCatalog
gfs_url = 'https://tds.scigw.unidata.ucar.edu/thredds/catalog/grib/NCEP/GFS/Global_0p5deg/catalog.xml'
cat = TDSCatalog(gfs_url)
now = datetime.utcnow()
# A shortcut to NCSS
ncss = cat.datasets['Best GFS Half Degree Forecast Time Series'].subset()
query = ncss.query()
query.var = set()
query.variables('u-component_of_wind_isobaric', 'v-component_of_wind_isobaric', 'Geopotential_height_isobaric')
query.lonlat_box(north=78, south=45, east=-90, west=-220)
query.time(now)
query.accept('netcdf4')
data = ncss.get_data(query)
# Reading in the u(isobaric), v(isobaric), isobaric vars and the GPH(isobaric6) and isobaric6 vars
# These are two slightly different vertical pressure coordinates.
# We will also assign units here, and this can allow us to go ahead and convert to knots
lat = units.Quantity(data.variables['lat'][:].squeeze(), units('degrees'))
lon = units.Quantity(data.variables['lon'][:].squeeze(), units('degrees'))
iso_wind = units.Quantity(data.variables['isobaric'][:].squeeze(), units('Pa'))
iso_gph = units.Quantity(data.variables['isobaric6'][:].squeeze(), units('Pa'))
u = units.Quantity(data.variables['u-component_of_wind_isobaric'][:].squeeze(), units('m/s')).to(units('knots'))
v = units.Quantity(data.variables['v-component_of_wind_isobaric'][:].squeeze(), units('m/s')).to(units('knots'))
gph = units.Quantity(data.variables['Geopotential_height_isobaric'][:].squeeze(), units('gpm'))
# Here we will select our altitudes to interpolate onto and convert them to geopotential meters
altitudes = ([30000., 9000., 3000.] * units('ft')).to(units('gpm'))
# Now we will interpolate the pressure coordinate for model output geopotential height to
# estimate the pressure level for our given altitudes at each grid point
pressures_of_alts = np.zeros((len(altitudes), len(lat), len(lon)))
for ilat in range(len(lat)):
for ilon in range(len(lon)):
pressures_of_alts[:, ilat, ilon] = log_interpolate_1d(altitudes,
gph[:, ilat, ilon],
iso_gph)
pressures_of_alts = pressures_of_alts * units('Pa')
# Similarly, we will use our interpolated pressures to interpolate
# our u and v winds across their given pressure coordinates.
# This will provide u, v at each of our interpolated pressure
# levels corresponding to our provided initial altitudes
u_at_levs = np.zeros((len(altitudes), len(lat), len(lon)))
v_at_levs = np.zeros((len(altitudes), len(lat), len(lon)))
for ilat in range(len(lat)):
for ilon in range(len(lon)):
u_at_levs[:, ilat, ilon], v_at_levs[:, ilat, ilon] = log_interpolate_1d(pressures_of_alts[:, ilat, ilon],
iso_wind,
u[:, ilat, ilon],
v[:, ilat, ilon])
u_at_levs = u_at_levs * units('knots')
v_at_levs = v_at_levs * units('knots')
# We can use mpcalc to calculate a wind speed array from these
wspd = mpcalc.wind_speed(u_at_levs, v_at_levs)
I was able to take my output from this and coerce it into your plotting code (with some unit stripping.)
Your 300-hPa GFS winds
My "30000-ft" GFS winds
Here is what my interpolated pressure fields at each estimated height level look like.
Hope this helps!
I am not sure if this is what you are looking for (I am very new to Metpy), but I have been using the metpy height_to_pressure_std(altitude) function. It puts it in units of hPa which then I convert to Pascals and then a unitless value to use in the Siphon vertical_level(float) function.
I don't think you can use metpy functions to convert height to pressure or vice versus in the upper atmosphere. There errors are too when using the Standard Atmosphere to convert say pressure to feet.
I feel I must be missing something obvious, in struggling to get a positive control for logistic regression going in tensorflow probability.
I've modified the example for logistic regression here, and created a positive control features and labels data. I struggle to achieve accuracy over 60%, however this is an easy problem for a 'vanilla' Keras model (accuracy 100%). What am I missing? I tried different layers, activations, etc.. With this method of setting up the model, is posterior updating actually being performed? Do I need to specify an interceptor object? Many thanks..
### Added positive control
nSamples = 80
features1 = np.float32(np.hstack((np.reshape(np.ones(40), (40, 1)),
np.reshape(np.random.randn(nSamples), (40, 2)))))
features2 = np.float32(np.hstack((np.reshape(np.zeros(40), (40, 1)),
np.reshape(np.random.randn(nSamples), (40, 2)))))
features = np.vstack((features1, features2))
labels = np.concatenate((np.zeros(40), np.ones(40)))
featuresInt, labelsInt = build_input_pipeline(features, labels, 10)
###
#w_true, b_true, features, labels = toy_logistic_data(FLAGS.num_examples, 2)
#featuresInt, labelsInt = build_input_pipeline(features, labels, FLAGS.batch_size)
with tf.name_scope("logistic_regression", values=[featuresInt]):
layer = tfp.layers.DenseFlipout(
units=1,
activation=None,
kernel_posterior_fn=tfp.layers.default_mean_field_normal_fn(),
bias_posterior_fn=tfp.layers.default_mean_field_normal_fn())
logits = layer(featuresInt)
labels_distribution = tfd.Bernoulli(logits=logits)
neg_log_likelihood = -tf.reduce_mean(labels_distribution.log_prob(labelsInt))
kl = sum(layer.losses)
elbo_loss = neg_log_likelihood + kl
predictions = tf.cast(logits > 0, dtype=tf.int32)
accuracy, accuracy_update_op = tf.metrics.accuracy(
labels=labelsInt, predictions=predictions)
with tf.name_scope("train"):
optimizer = tf.train.AdamOptimizer(learning_rate=FLAGS.learning_rate)
train_op = optimizer.minimize(elbo_loss)
init_op = tf.group(tf.global_variables_initializer(),
tf.local_variables_initializer())
with tf.Session() as sess:
sess.run(init_op)
# Fit the model to data.
for step in range(FLAGS.max_steps):
_ = sess.run([train_op, accuracy_update_op])
if step % 100 == 0:
loss_value, accuracy_value = sess.run([elbo_loss, accuracy])
print("Step: {:>3d} Loss: {:.3f} Accuracy: {:.3f}".format(
step, loss_value, accuracy_value))
### Check with basic Keras
kerasModel = tf.keras.models.Sequential([
tf.keras.layers.Dense(1)])
optimizer = tf.train.AdamOptimizer(5e-2)
kerasModel.compile(optimizer = optimizer, loss = 'binary_crossentropy',
metrics = ['accuracy'])
kerasModel.fit(features, labels, epochs = 50) #100% accuracy
Compared to the github example, you forgot to divide by the number of examples when defining the KL divergence:
kl = sum(layer.losses) / FLAGS.num_examples
When I change this to your code, I quickly get to an accuracy of 99.9% on your toy data.
Additionaly, the output layer of your Keras model actually expects a sigmoid activation for this problem (binary classification):
kerasModel = tf.keras.models.Sequential([
tf.keras.layers.Dense(1, activation='sigmoid')])
It's a toy problem, but you will notice that the model gets to 100% accuracy faster with a sigmoid activation.
Okay so my assignment is for an engineering project and I have talked to my teacher many times but without much success. the code reads data that comes from a rotary encoder in a text file. The question I have is how do I make two sets of arrays with age and gender and link it to each text file thats read in. For example the first text file comes from a girl that is 10; that spun a crank and output data to a text file. How do i code so that someway i can assign the first text file to an age and gender? Heres my code so far any help is appreciated.
%% ME 208 Project Group 21
clear; close all; clc;
%Constants
dt=.1;
%Translate Data
mass = 10; %values are in units of Kilograms
radius = 1; %values are in units of meters
inertia = mass*radius^(2);
for ii=1:2
%File Name Variable
filename=['sub_' num2str(ii) '.txt'];
%Data is Collected
Data1=dlmread(filename,'\t',0,0);
%Times for data
t1=dt:dt:length(Data1)*dt;
%Vel
[ang_vel1, ang_acc1]=dxdt_d2xdt2(Data1,2,dt);
torq1 = inertia*ang_acc1;
%Calculations of parameters
meanrt1(ii) = rms(torq1);
maxrt1(ii) = max(torq1);
end
%Plot
figure(1);plot(t1,torq1,t2,torq2); grid minor;