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I can't figure out this simple(?) pattern in vb.net.
So the problem is this: I have 4 arrays of integers, 2 of them are from 0 to 29, and the last 2 are from 0 to 9. Now I am trying to make the pattern look like this:
I hope it makes sense.
This simple LINQ-query should give you the expected result.
Dim big1 = Enumerable.Range(0, 30).ToArray()
Dim big2 = Enumerable.Range(0, 30).ToArray()
Dim small1 = Enumerable.Range(0, 10).ToArray()
Dim small2 = Enumerable.Range(0, 10).ToArray()
Dim result = From b1 in big1
From b2 in big2
From s1 in small1
From s2 in small2
Select New With {b1, b2, s1, s2}
...
It uses the Enumerable.SelectMany function:
Enumerable.SelectMany
Projects each element of a sequence to an IEnumerable and flattens the resulting sequences into one sequence.
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I am new to pandas.
I have been trying to solve a problem here
This is the problem statement where I want to drop any row where I have a duplicate A but non duplicate B
Here is the kind of output I want
enter image description here
IIUC, this is what you need
a = (df['A'].ne(df['A'].shift())).ne((df['B'].ne(df['B'].shift())))
df[~a].reset_index(drop=True)
Output
A B
0 2 z
1 3 x
2 3 x
I think you need:
cond=(df.eq(df.shift(-1))|df.eq(df.shift())).all(axis=1)
pd.concat([df[~cond].groupby('A').last().reset_index(),df[cond]])
A B
0 2 y
2 3 x
3 3 x
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I am using the following code which works perfectly:
If ComboBox3.ListIndex = 0 And ComboBox4.ListIndex = 3 Then
ID1 = "GS-T10-"
Elseif ComboBox3.ListIndex = 0 And ComboBox4.ListIndex = 4 Then
ID1 = "PB-"
Elseif ComboBox3.ListIndex = 0 And ComboBox4.ListIndex = 5 Then
ID1 = "PE-"
As you can see It is if statement with AND operator evaluating 2 conditions.
However notice that my first condition is always the same (ComboBox3.ListIndex = 0), and only the second condition is changing. Is there a way to just write the first condition (which is not changing) once at the beginning of the IF Statement and hence only write the second condition after each Elseif??
Thank you,
You should "take out" the repeating condition to outer If statement, like this:
If ComboBox3.ListIndex = 0 Then
If ComboBox4.ListIndex = 3 Then
ID1 = "GS-T10-"
Elseif ComboBox4.ListIndex = 4 Then
ID1 = "PB-"
Elseif ComboBox4.ListIndex = 5 Then
ID1 = "PE-"
End If
End If
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Date Signal
1 2008-05-28 11:00:00 1.886108
2 2008-04-17 12:00:00 1.885108
3 2008-05-21 12:00:00 1.166525
4 2008-05-28 11:00:00 1.166525
5 2008-05-23 11:00:00 1.010902
Hi, is there a way I can match the above dataframe to a date, eg 2008-05-28 11:00:00 and print only the Signal value if it matches?
thanks in advance.
* apologies if this was a niave question. I tried many various methods but not .loc which has been kindly pointed out below and works perfectly, thank you.
Assuming you have data frame df
d = pandas.Timestamp("2008-05-28 11:00:00", tz=None)
df[df.Date == d].Signal
You can use loc too:
df.loc[df.Date == '2008-05-28 11:00:00', 'Signal']
Not tested but something along the lines of...
df['Signal'][df.Date == '2008-05-28 11:00:00']
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I want to get the line numbers where the implementation of objective c method start.
1 #include "foobar.h"
2 -(void)Foo{
3 ...
4 }
5
6 +(NSInteger *)bar{
7 ...
8 }
The output should be: 2,6
How can i achieve it with libclang.
I do not want to use a regex for that, because it will be sufficient.
Solution:
CXSourceRange range = clang_getCursorExtent(cursor);
CXSourceLocation startLocation = clang_getRangeStart(range);
CXSourceLocation endLocation = clang_getRangeEnd(range);
CXFile file;
unsigned int line, column, offset;
clang_getInstantiationLocation(startLocation, &file, &line, &column, &offset);
enum CXCursorKind curKind = clang_getCursorKind(cursor);
CXString curKindName = clang_getCursorKindSpelling(curKind);
const char *funcDecl="ObjCInstanceMethodDecl";
if(strcmp(clang_getCString(curKindName),funcDecl)==0){
printf("%u",line);
}
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I have this problem getting the Standard Deviation (equiation here). My question is how could I get the sum of ([X interval] - mean) from a set of data wherein a certain criteria(s) is to be followed.
For example, the data is:
Gender Grade
M 36
M 32
F 25
F 40
I have acquired N needed in the equation via COUNTIFS and acquired the mean via SUMIFS. The problem is having the get the sum of the range (X interval minus mean) without declaring a cell/column for the said range. In the given example, I would want to get the Standard Deviation of Grade with respect to gender. It would be hard if record 2 gender would be changed to 'F' if I would add column for X interval minus mean.
Any thoughts how this maybe done?
With a little algebra the sd formula can be rewritten as
Ʃ(x²) - Ʃ(x)²/n
sd = √( --------------- )
n
which can be implemented with SUMIFS, COUNTIFS and SUMPRODUCT
Assuming gender data is in range A1:A4 and grade in B1:B4 and criteria in C1 use
=SQRT( (SUMPRODUCT($B$1:$B$4,$B$1:$B$4,--($A$1:$A$4=C1)) -
SUMIFS($B$1:$B$4,$A$1:$A$4,C1)^2/COUNTIFS($A$1:$A$4,C1)) /
COUNTIFS($A$1:$A$4,C1) )