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How can I get blocks from a string ( NSString ) and copy then to a array?
int BlockSize = 3
char array[3];
NSString *ns = #"ABCDEFGHI";
What I want to do is get the the first 3 elements and put on array[0] , the next 3 elements and put then on array[1] , the next 3 on array[2]
Thanks
to get character from string you can use below code:
NSString *ns = #"ABCDEFGHI";
arr[0]= [ns characterAtIndex:0];
NSLog(#"%c",arr[0]);
arr[1]= [ns characterAtIndex:1];
NSLog(#"%c",arr[1]);
Or even you go through forloop to iterate to complete string length
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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 have an input file to read values from and one such value is 1d10.
How to make sense of that value?
The input file is below and its for LU factorization:
8000 8000 8000 1d10 120 120 8
The variables above are:
min_n max_n stepsize total_flops_in_timing_block blower bupper bstride
Assuming all of those values are integers except for the flops variable, this example code will work. Also note this depends on the fixed width of your input file and the values being separated by a single space. If you have more general needs this will need tweaking to work.
program test
implicit none
integer :: n_min, n_max, n_step, b_low, b_high, b_stride
integer :: ufile
real(kind=kind(1d0)) :: flops
open(newunit=ufile, file="input2.txt", access="sequential")
read(ufile,*) n_min, n_max, n_step, flops, b_low, b_high, b_stride
close(ufile)
print *, "min_n = ", n_min
print *, "max_n = ", n_max
print *, "stepsize = ", n_step
print *, "flops = ", flops
print *, "blower = ",b_low
print *, "bupper = ", b_high
print *, "bstride = ", b_stride
end program test
Given the input file:
8000 8000 8000 1d10 120 120 8
produces this output:
% ./read_input
min_n = 8000
max_n = 8000
stepsize = 8000
flops = 10000000000.000000
blower = 120
bupper = 120
bstride = 8
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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 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 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) )