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kandi X-RAY | formulate Summary
kandi X-RAY | formulate Summary
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QUESTION
I have a binary matrix. Each column corresponds to a vertex in a graph. If I walk along the path (starting on the "col 1" vertex, then moving on to "col 2" etc.), I have to pay some fines. But since there are only so many police officers on the path, I can wait for some time until there is no police officer remaining on the next vertex, then go over. To clarify, the following matrix (first row is the "title" row):
...ANSWER
Answered 2022-Mar-30 at 13:54Let's start with a simple question. Let's say you're at row i, column j (i.e. cell (i,j)) of the matrix. What choices do you have for the next step?
Since we're moving column-wise, j becomes j+1. But for the row, you can greedily choose the row which pays the minimum fine. That is, you can pick i' in range (i+1, row_count) such that fine(i,j) is minimum. (Note: since the row represents points in time, you can't go from row i to i-1, effectively shortening our search space).
The algorithm:
(n = number of rows = len(matrix), m = number of columns)
- For the rightmost column, we don't have any further paths, so no modification needed
- For columns
m-1 to 1, the minimum fine for cell(i,j)will be
QUESTION
Good Morning,
I'm trying to formulate something in Excel that allow us to check if the value of two columns are new in a list, and if so, assign a new ID for them. If it's not, let it "Blank" or Assign the same ID that have been assigned before(Either way would work for me).
I'm trying to use something with Count.if, but it doesn't fit. As i'm thinking about this for some time, i decided to look for help.
What i want to do is a formula that solves the "Formula" Columns below:
...ANSWER
Answered 2022-Mar-29 at 16:03If you don't mind non-sequential numbering, you can just return the index of the first match found as your identifier:
Copy into C2, then fill down as necessary. The match row stop may need alteration based on how much data you have
QUESTION
I have this requirement to determine dates and one of them I need to filter out Good Friday (only) with a parameter of given year
...ANSWER
Answered 2022-Mar-15 at 04:18create or replace
function good_friday(p_year number) return date is
l_day pls_integer := 0;
l_month pls_integer := 3;
l_lunar pls_integer := mod(p_year,19);
l_cent pls_integer := p_year / 100;
l_equi pls_integer := mod((l_cent - floor(l_cent / 4) - floor((8 * l_cent + 13) / 25) + 19 * l_lunar + 15),30);
l_full pls_integer := l_equi - floor(l_equi / 28) * (1 - floor(l_equi / 28) * floor(29 / (l_equi + 1)) * floor((21 - l_lunar) / 11));
begin
l_day := l_full - mod((p_year + floor(p_year / 4) + l_full + 2 - l_cent + floor(l_cent / 4)),7) + 28;
if l_day > 31 then
l_month := 4;
l_day := l_day - 31;
end if;
return to_date(p_year||'-'||l_month||'-'||l_day,'YYYY-MM-DD')-2;
end;
/
SQL> select good_friday(2022) from dual;
GOOD_FRID
---------
15-APR-22
SQL> select good_friday(2011) from dual;
GOOD_FRID
---------
22-APR-11
QUESTION
I implemented an algorithm which, for a given non-negative rational number r and a positive interger b, computes all of the digits of the expansion of r in base b. The algorithm itself actually outputs a function f(i: int) satisfying the equation n = ... + f(-2)*b**-2 + f(-1)*b**-1 + f(0)*b**0 + f(1)*b**1 + f(2)*b**2 + ..., and it computes the digits of the whole and fractional parts of r separately through two other auxiliary functions.
Below is my code in Python (3.10.2). It looks weird for Python code because I'm actually implementing the algorithm in MIT/GNU Scheme (15.3) and "sketching" it on Python. I'm showing the Python implementation instead of the Scheme one mostly because I believe it's easier to formulate this question (and actually have it answered) in Python.
...ANSWER
Answered 2022-Feb-20 at 22:23Steps:
- Split into whole and fractional part
- Extract the whole digits by repeatedly dividing by
buntil there's nothing left. - Extract the fractional digits by repeatedly multiplying with
buntil we reach a fraction we've seen before. - Split the fractional digits at the place where we first saw the final fractional value.
QUESTION
I am solving an algorithm question:
...You are given a binary tree
root. In one operation you can delete one leaf node in the tree. Return the number of different ways there are to delete the whole tree. So, if the tree is:
ANSWER
Answered 2022-Feb-18 at 04:56For a give node X, we want to know u(X) - the number of unique delete sequences.
Assume this node has two children A, B with sizes |A|, |B| and known u(A) and u(B).
How many delete sequences can you construct for X? You could take any two sequences from u(A) and u(B) and root and combine them together. The result will be a valid delete sequence for X if the following holds:
- The root
Xmust be deleted last. - Order of deletion of any two nodes from different subtrees is arbitrary.
- Order of deletion of any two nodes from the same subtree is fixed given its chosen delete sequence.
This means you want to find out the number of ways you can interleave both sequences (and append X).
Notice that the length of a delete sequence is the size of the tree, that's kind of trivial if you think about it.
Also give some though to the fact that this way we can generate all the delete sequences for X, that might not be so trivial.
So if I'm counting correctly, the formula you are looking for is u(X)= [|A|+|B| choose |A|] * u(A) * u(B).
It holds for empty children too if we define u(empty)=1.
Just be careful about overflow, the number of combinations will explode quite quickly.
QUESTION
This question is to some part identical to what has already been asked here. But the referenced question never received the answer to the point whether the issue presented here is a bug or documentation confusion.
Documentation states with respect to the layout option of multiplot:
With the layout option you can generate simple multiplots without having to give the set size and set origin commands before each plot: Those are generated automatically, but can be overridden at any time.
My understanding of that text is that layout sets origin and size and at any time, i can change those specifications. Then this should work:
...ANSWER
Answered 2022-Feb-17 at 11:01My guess would be that it is a bit unclear documentation.
It's a matter of taste and convenience and depends on your situation. Setting origin and size is setting the place for the (sub-)"canvas". This (sub-)"canvas" still can have some individual b,t,l,r margins. Note, margins are the space between graph border and canvas-border.
Apparently, the margins which you are setting in the multiplot layout are kept for your extra plot. So, apparently you have to reset them, e.g.
set margins 0,0,0,0. And then you are probably getting your intended plot.I am not aware that you can extract the automatically calculated values for margins. There are no such values listed in
show var GPVAL.
Code:
QUESTION
Say I have condition 1 and condition 2. If condition 1 and condition 2 was met within up to, say, 5 bars, then I want to perform some action. As an example let's say condition 1 was met at current close, and condition 2 was fulfilled 5 bars ago, then I want to perform some action. How do I formulate that in Pine?
...ANSWER
Answered 2021-Dec-08 at 09:38a) You would need to use ta.barssince() function.
https://www.tradingview.com/pine-script-reference/v5/#fun_ta%7Bdot%7Dbarssince
QUESTION
I have tried looking at other merge rows in pandas solutions here and here and especially the solution here.
I want to combine the individual sentences scraped from bullet points into one paragraph between the empty blank rows. BUT keep the blank rows as they are. I want to keep the first sentence's paragraph id as the new id. (Paragraph ids are not necessarily continuous as there was some pre-cleaning done.)
...ANSWER
Answered 2021-Nov-25 at 15:43You're almost there, just groupby on both the non-zero lengths and cumsum:
QUESTION
I am trying to optimize the below problem in CPLEX OPL. I have defined the parameters and decision variables. However, when I try to formulate the objective function and the constraints I seem to encounter a problem as I receive an error in the line of the objective function calles 'cannot use type range for int'. I am not sure what is wrong here.
Also in the constraint formulation I have a problem formulating constraints that ensure that variable I & W are balanced in between two consequative periods. CPLEX error reads operator not available for range - int.
The problem I am trying to recreate is: This is my current data file:
...ANSWER
Answered 2021-Oct-20 at 13:20A few errors but
.mod
QUESTION
I defined a type of s-expressions and it's printing functions.
...ANSWER
Answered 2021-Oct-18 at 19:11The type sexp is an example of a nested inductive type, where one of the recursive occurrences appears inside of another induction. Such types are hard to work with in Coq, because the induction principles that it generates by default are not useful. However, you can fix this issue by writing down your own induction principle by hand. Here is one possibility:
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