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C# extract data from start of StringBuilder


C# extract data from start of StringBuilder

By : user2953378
Date : November 20 2020, 01:01 AM
seems to work fine If you want character extraction in many parts of your code, you can try implementing the algorithm as an extension method:
code :
  public static class StringBuilderExtensions {
    public static String Extract(this StringBuilder source, int length) {
      if (Object.ReferenceEquals(null, source))
        throw new ArgumentNullException("source");
      else if ((length < 0) || (length > source.Length))
        throw new ArgumentOutOfRangeException("length");

      // Your actual algorithm
      String result = source.ToString(0, length);

      source.Remove(0, length);

      return result;
    }
  }

  ...

  StringBuilder data = ...
  String s = data.Extract(len); // <- Just extract


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Why use StringBuilder explicitly if the compiler converts string concatenation to a StringBuilder automatically?

Why use StringBuilder explicitly if the compiler converts string concatenation to a StringBuilder automatically?


By : magda.m.rinke
Date : March 29 2020, 07:55 AM
will be helpful for those in need As you mention, you should not use StringBuilder instead of a simple string concatenation expression such as a + " = " + b. The latter is faster to type, easier to read, and the compiler will use a StringBuilder internally anyway so there is no performance advantage by rewriting it.
However StringBuilder is useful if you are concatenating a large number of strings in a loop. The following code is inefficient. It requires O(n2) time to run and creates many temporary strings.
code :
String result = "";
for (int i = 0; i < foo.length; ++i)
{
    result += bar(foo[i]);  // Bad
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < foo.length; ++i)
{
    sb.append(bar(foo[i]));
}
String result = sb.toString();
If StringBuilder is mutable, then why do StringBuilder methods return a StringBuilder object?

If StringBuilder is mutable, then why do StringBuilder methods return a StringBuilder object?


By : N_Jones
Date : March 29 2020, 07:55 AM
around this issue It's called a "fluent interface". It allows you to chain together calls by repeated dot notations.
code :
return new StringBuilder()
  .Append("Hello, ")
  .Append("world!")
  .ToString();
python how to extract particular data in a line which start from different characters

python how to extract particular data in a line which start from different characters


By : Marcel
Date : March 29 2020, 07:55 AM
To fix this issue Given the input data you've provided and adding in an entry that actually matches (last row in f2), I've used the following code which printed the match:
code :
f1 = [ 
    "5.2,LOC_Os01g07070,Os01g0164400,osRBD2b,1,f,3321774,3326179,,,", 
    "5.2,LOC_Os05g51480,Os05g0592400,osDBP2a,5,f,29449210,29457409,,,",
    "5.2,LOC_Os07g12490,Os07g0227400,osRBD1b,7,f,7119724,7125463,,,",
]

f2 = [ 
    "33123472 LOC_Os01g15010 LOC_Os01g15010.1 LOC_Os01g15010.1 PF08477 PTHR11711,PTHR11711:SF203 KOG0077 K07953 GO:0007264,GO:0005525 AT4G02080.1 ASAR1,ATSAR2,ATSARA1C,SAR2 secretion-associated RAS super family 2",
    "33122156 LOC_Os01g15020 LOC_Os01g15020.1 LOC_Os01g15020.1 PF00400 PTHR22847,PTHR22847:SF424 KOG0266 GO:0005515 AT3G16830.1 TPR2 TOPLESS-related 2",
    "33122157 LOC_Os01g15020 LOC_Os01g15020.2 LOC_Os01g15020.2 PF00400 PTHR22847,PTHR22847:SF424 KOG0266 GO:0005515 AT3G16830.1 TPR2 TOPLESS-related 2",
    "33121795 LOC_Os01g15029 LOC_Os01g15029.1 LOC_Os01g15029.1 5.2.1.8 AT3G66654.3 Cyclophilin-like peptidyl-prolyl cis-trans isomerase family protein",
    "33121795 LOC_Os07g12490 LOC_Os01g15029.1 LOC_Os01g15029.1 5.2.1.8 PTHR22847,PTHR22847:SF424 AT3G66654.3 Cyclophilin-like peptidyl-prolyl cis-trans isomerase family protein",
]


for info in f1:
    locus_id = info.split(',')[1]
    if not locus_id.startswith("LOC"):
        continue

    for detail in f2:
        split_detail = detail.split()
        if locus_id != split_detail[1]:
            continue

        if not split_detail[2].startswith("LOC"):
            continue

        for element in split_detail:
            if element[:4].upper() == "PTHR":
                print(element)
PTHR22847,PTHR22847:SF424
# ====
# DEFINITIONS OF f1 and f2
# ====

f_out = open("output.txt", "w")

for info in f1: 
    locus_id = info.split(',')[1]
    if not locus_id.startswith("LOC"):
        continue

    for detail in f2: 
        split_detail = detail.split()
        if locus_id != split_detail[1]:
            continue

        if not split_detail[2].startswith("LOC"):
            continue

        for element in split_detail:
            if element[:4].upper() == "PTHR":
                f_out.write(element + "\n")

f_out.close()
in file there is set of start and end point i need to extract the data between those two points and again read another s

in file there is set of start and end point i need to extract the data between those two points and again read another s


By : user3037846
Date : March 29 2020, 07:55 AM
like below fixes the issue you can read data between START and END point and save them in list to do any additional work:
code :
the_list = []
dataList = []
with open('putt.txt', "r") as f:
    isLine = False
    for line in f:
        if "END point" in line:
            print(the_list)
            # do whatever you want with these lines
            dataList.append(the_list)
            the_list = []
            isLine = False
        if "START point" in line:
            isLine = True
        if "START point" not in line and isLine:
            if(len(line)>0):
                the_list.append(line)
['data 1 \n', 'data 2\n', 'data 3\n', 'data 4\n']
['data 1 \n', 'data 2\n', 'data 3\n', 'data 4\n']
['data 1 \n', 'data 2\n', 'data 3\n', 'data 4\n']
['data 1 \n', 'data 2\n', 'data 3\n', 'data 4\n']

print(dataList[0])    
['data 1 \n', 'data 2\n', 'data 3\n', 'data 4\n']
How to extract data from a time series based on start and end dates from a different dataframe?

How to extract data from a time series based on start and end dates from a different dataframe?


By : user3435840
Date : March 29 2020, 07:55 AM
To fix the issue you can do One option is to do the comparison on each corresponding StartTime, EndTime, and subset the data
code :
library(xts)
do.call(rbind, Map(function(x, y) Nitrogen[paste( x, y,  sep="/")], 
              Storms$PeakStartTime, Storms$PeakEndTime))
#                       [,1]
#2019-05-29 18:30:00 -0.07102752
#2019-05-29 18:45:00 -0.19454811
#2019-05-29 19:00:00 -1.69684540
#2019-05-29 19:15:00  1.09384970
#2019-05-29 19:30:00  0.20019572
#2019-05-29 19:45:00 -0.76086259
# ...
set.seed(24)
Nitrogen <- xts(rnorm(20000), order.by = seq(as.POSIXct('2019-03-20 10:00:00'),
       length.out = 20000, by = '15 min'))   


Storms <- structure(list(PeakNumber = 1:6, PeakTime = structure(c(1563761700, 
1563817500, 1562859000, 1559169900, 1561667400, 1562847300), class = c("POSIXct", 
"POSIXt"), tzone = ""), PeakHeight = c(81.04667, 66.74048, 49.08663, 
37.27926, 33.12268, 31.59931), PeakStartTime = structure(c(1563759000, 
1563814800, 1562856300, 1559169000, 1561665600, 1562845500), class = c("POSIXct", 
"POSIXt"), tzone = ""), PeakEndTime = structure(c(1563785100, 
1563853500, 1562886000, 1559177100, 1561670100, 1562850000), class = c("POSIXct", 
"POSIXt"), tzone = ""), DurationHours = c(7.25, 10.75, 8.25, 
2.25, 1.25, 1.25)), row.names = c("1", "2", "3", "4", "5", "6"
), class = "data.frame")
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