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Reducing step count in regex for a year terminator


By : Shrimasis Rout
Date : October 17 2020, 03:08 PM
To fix the issue you can do I've got a question regarding regular expression step counts in discovering a year near or at the end of a string. , Steps
Step counter using regex101
code :
^.*(\d{4})        17
^.*\K\d{4}        16
\d{4}             23
^.*(\d{4})           ~915,000/s
^.*([0-9]{4})        ~1,030,000/s
\d{4}                ~693,000/s
[0-9]{4}             ~910,000/s
^.*(\d{4})           ~1,233,000/s
^.*([0-9]{4})        ~1,340,000/s
\d{4}                ~698,000/s
[0-9]{4}             ~909,000/s
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text.RegularExpressions;

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            Stopwatch stopwatch = new Stopwatch();

            List<string> regexes = new List<string> {
                @"[0-9]{4}",
                @"^.*([0-9]{4})"
            };

            foreach (string regex in regexes)
            {
                List<TimeSpan> times = new List<TimeSpan>();

                for (int i = 0; i < 100; i++)
                {
                    stopwatch.Start();

                    Regex myRegex = new Regex(regex, RegexOptions.RightToLeft);
                    string strTargetString = @"Chocolatechipcookie2017!";

                    for (int j = 0; j < 100000; j++)
                    {
                        foreach (Match myMatch in myRegex.Matches(strTargetString))
                        {
                        }
                    }

                    stopwatch.Stop();
                    times.Add(stopwatch.Elapsed);
                }
                TimeSpan average = TimeSpan.FromMilliseconds(times.Average(t => t.TotalMilliseconds));
                Console.WriteLine($"Elapsed={average}");
            }

            Console.Read();
        }
    }
}


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Step count retrieved through Google Fit Api does not match Step count displayed in Google Fit Official App


By : user3422901
Date : March 29 2020, 07:55 AM
Hope this helps I found the solution.
The Fit app does some additional processing on top of the steps. It estimates steps based on the activity when none are recorded.
code :
DataSource ESTIMATED_STEP_DELTAS = new DataSource.Builder()
            .setDataType(DataType.TYPE_STEP_COUNT_DELTA)
            .setType(DataSource.TYPE_DERIVED)
            .setStreamName("estimated_steps")
            .setAppPackageName("com.google.android.gms")
            .build();
DataReadRequest readRequest = new DataReadRequest.Builder()
            .aggregate(ESTIMATED_STEP_DELTAS, DataType.AGGREGATE_STEP_COUNT_DELTA)
            .bucketByTime(1, TimeUnit.DAYS)
            .setTimeRange(startTime, endTime, TimeUnit.MILLISECONDS)
            .build();

Regex Ignore first and last terminator


By : Venk
Date : March 29 2020, 07:55 AM
hope this fix your issue I have string in text that have uses | as a delimiter. , The regex is very easy, but why not just use Trim():
code :
var str = "|2P|1|U|F8|";
str = str.Trim(new[] {'|'});
str = str.Trim('|');
var str = "\r\n |2P|1|U|F8|   \r\n";
str = str.Trim().Trim('|');

Java 8 Lambda (grouping and reducing in a single step)


By : jstumpe
Date : March 29 2020, 07:55 AM
I hope this helps you . You can simplify the code by passing a mapping collector into the groupingBy collector like this:
code :
Map<A, Set<B>> collect = 
       listOfPairs.stream()
                  .collect(Collectors.groupingBy(Pair::getLeft, 
                                Collectors.mapping(Pair::getRight,
                                       Collectors.toSet())));

How to match two different graphs as much as possible by reducing difference in y-axis step by step by iteration in pyth


By : user3116545
Date : March 29 2020, 07:55 AM
To fix the issue you can do What I'd do is try to shift one of the sets such that root mean square of difference between it and the other one is minimised. You could also narrow the criterion down to a region of interest in the data (I'm guessing around the peak). To compute RMS error, you'll need to interpolate the data onto the same x-values. Here's an example:
code :
import numpy as np
import matplotlib.pyplot as plt

from scipy.optimize import minimize

# Create data
x0 = np.linspace(0, 2.*np.pi, 101)
y0 = np.sin(x0)
x1 = np.linspace(0, 2.*np.pi, 201)
y1 = np.sin(x1+0.1*np.pi)

def target(x):
    # Interpolate set 1 onto grid of set 0 while shifting it by x.
    y1interp = np.interp(x0, x1+x, y1)

    # Compute RMS error between the two data with set 1 shifted by x.
    return np.sqrt(np.sum((y0-y1interp)**2.))

result = minimize(target, method="BFGS", x0=[0.])#, bounds=[(-0.2, 0.2)]) # bounds work with some methods only
print(result)

plt.figure()
plt.plot(x0, y0, "r", x1, y1, "b")
plt.plot(x1+result.x, y1, "k", lw=2)
plt.legend(["set 0", "set 1", "set 1 shifted"])

Replace 2 step Regex with 1 step Regex to get one upper case letter between underscores


By : alex
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You can use positive lookarounds to avoid a 2-step process, checking that the characters before and after the letter are underscores without capturing them:
code :
Dim myFile AS String = "Name_2019-11-29_D_HPSeries.txt"
Dim bC As String = Regex.Match(myFile, "(?<=_)[A-Z](?=_)").ToString
Console.WriteLine(bc)
D
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