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2D table conversion for example: y = f(x1,x2) => x1 = f(y, x2)


2D table conversion for example: y = f(x1,x2) => x1 = f(y, x2)

By : Saroja
Date : October 24 2020, 06:10 AM
it helps some times In Matlab:
My other answer assumed the most general case where the value for the RPM could be anything in the range of 800 to 4800. However, if you're certain that your chosen value will be one of the rows, you need only consider the values in that row:
code :
Percent = [0 20 30 40 ... 90 100];
RPM = [800; 1200; 1400; ... 4400; 4800];
Table = [ -54 97 ... 362;
          -60 114 ... 425;
          ...
          -111 31 ... 277;]
x2 = 800;
y = 107;

RPM_id = find(RPM == x2,1);
Table_row = Table(RPM_id,:);
x1 = interp1(Table_row,Percent,y)
x1 =
   28.3333


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Replacing values in large table using conversion table

Replacing values in large table using conversion table


By : FViel
Date : March 29 2020, 07:55 AM
To fix this issue I am trying to replace values in a large space-delimited text-file and could not find a suitable answer for this specific problem: , Here's one way using awk:
code :
awk 'NR==1 { next } FNR==NR { a[$1]=$2; next } $1 in a { $1=a[$1] }1' TABLE OLD_FILE
COL1 COL2 COL3 COL4 COL5
7_92383888 7 92221824 C A
12_126890980 12 125456933 G A
4_21618674 4 21227772 T C
4_1357325 4 1347325 G C
4_37225069 4 36901464 C A
4_84778125 4 84997149 T C
3_183635768 3 185118462 T C
4_95733906 4 95952929 T G
NR==1 { next }            # simply skip processing the first line (header) of
                          # the first file in the arguments list (TABLE)

FNR==NR { ... }           # This is a construct that only returns true for the
                          # first file in the arguments list (TABLE)

a[$1]=$2                  # So when we loop through the TABLE file, we add the
                          # column one to an associative array, and we assign
                          # this key the value of column two

next                      # This simply skips processing the remainder of the
                          # code by forcing awk to read the next line of input

$1 in a { ... }           # Now when awk has finished processing the TABLE file,
                          # it will begin reading the second file in the
                          # arguments list which is OLD_FILE. So this construct
                          # is a condition that returns true literally if column
                          # one exists in the array

$1=a[$1]                  # re-assign column one's value to be the value held
                          # in the array

1                         # The 1 on the end simply enables default printing. It
                          # would be like saying: $1 in a { $1=a[$1]; print $0 }'
MYSQL Copying One Table to Another Table With Conversion of Columns

MYSQL Copying One Table to Another Table With Conversion of Columns


By : user7168280
Date : March 29 2020, 07:55 AM
seems to work fine I'm copying data from one database table to another database table. This essentially is copying the data from our old format to our new format. So, in addition to simply copying columns value-for-value, I also need to do some conversions in the copy statements as well. , Try like below:
code :
INSERT INTO new_database.table1 (id, product, is_default) 
SELECT id, product, IF(is_default='Y',1,0) as isdefault FROM old_database.table1
Cannot convert type via a reference conversion, boxing conversion, unboxing conversion, wrapping conversion, or null typ

Cannot convert type via a reference conversion, boxing conversion, unboxing conversion, wrapping conversion, or null typ


By : user3813692
Date : March 29 2020, 07:55 AM
help you fix your problem You cannot cast a List of one type to a List of a different type.
And if you think about it, you would be glad that you can't. Imagine the havoc you could cause if it was possible:
code :
 interface ICustomRequired
 {
 }

 class ImplementationOne : ICustomRequired
 {
 }

 class ImplementationTwo: ICustomRequired
 {
 }

 var listOne = new List<ImplementationOne>();
 var castReference = listOne as List<ICustomRequired>();
 // Because you did a cast, the two instances would point
 // to the same in-memory object

 // Now I can do this....
 castReference.Add(new ImplementationTwo());

 // listOne was constructed as a list of ImplementationOne objects,
 // but I just managed to insert an object of a different type
 exampleList as IEnumerable<ICustomRequired>;
var newList = (exampleList as IEnumerable<ICustomRequired>).ToList();
var newList = exampleList.Cast<ICustomRequired>().ToList();
Create Table from Another Table - MYSQL to MSSQL conversion

Create Table from Another Table - MYSQL to MSSQL conversion


By : user6575207
Date : March 29 2020, 07:55 AM
this will help I'm in the process of converting a database from MYSQL to MSSQL/TSQL, and I can't get the following MYSQL query to work in MSSQL. Looking for a fresh set of eyes to see what I'm missing. , You can't use Create table as or Select table into in mssql
Use:
code :
SELECT * INTO tempTable FROM Note N
WHERE N.createdate IN (SELECT MAX(N1.createdate) FROM Note N1 GROUP BY N1.taskPK)
There is no boxing conversion or type parameter conversion from <T> to 'Microsoft.WindowsAzure.Storage.Table.ITabl

There is no boxing conversion or type parameter conversion from <T> to 'Microsoft.WindowsAzure.Storage.Table.ITabl


By : Divyanshu Sahu
Date : March 29 2020, 07:55 AM
I hope this helps . The problem was the generic type in the method signature. Once I removed this everything worked as expected.
code :
private void GetStorageTableValues<AzureStorageTableEntities>()
private void GetStorageTableValues()
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