1,073 questions
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Why does R evaluate `NA==T|F` as NA, but `NA==F|T` as True? (and related Qs) [duplicate]
If you run the following lines of code in R, you may be surprised by the results (printed above each line as a comment)
#1: NA
NA==T
#2: NA
NA==F
#3: NA
NA==T&T
#4: FALSE
NA==F&F
#5: NA
NA==F&...
1
vote
2
answers
84
views
truthy values == false return true
So I am a beginner at javascript and learnt that there are only a limited falsy values: false, 0, -0, BigInt 0n, “”, null, undefined, NaN
Yet when I use the == operator with truthy values, this ...
- 33
0
votes
1
answer
32
views
Troubleshooting of Boolean combination of AND and OR conditions in Excel Formula [duplicate]
I am trying to set up an Excel conditional formula with both AND and OR criteria.
However, the last 2 criteria OR(Table1[Col5]=$J$4,Table1[Col5]=$K$4) and OR(Table1[Col6]=Pivot!$J$5,Table1[Col6]=Pivot!...
- 97
2
votes
2
answers
81
views
Odd boolean expression
I'm trying to debug (rewrite?) someone else's Python/cherrypy web app, and I ran across the following 'if' statement:
if not filename.endswith(".dat") and (
filename.endswith(".dat&...
- 325
0
votes
0
answers
53
views
Logical condition equivalent with restrictions
I am developing an Azure DevOps custom task. Part of the setting of the inputs is a VisibleRule which can contain a condition which will determine if the input will be visible, if the condition is ...
- 12.4k
-2
votes
1
answer
35
views
Can a contradiction Boolean expression with variables 𝑎 and 𝑏 be represented in NAND form? [closed]
I have f(a,b) = 0 and want to represent it in NAND form (only using NAND gates) in terms of a and b, but I don't think is possible.
- 19
9
votes
0
answers
304
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Limiting the depth of Boolean expressions
I am given a Boolean expression of arbitrary depth, like (A or (B and (C or (~D and E) or F) or (G and H))). There can be any number of terms at each level.
I want to limit the depth of the ...
- 59.6k
0
votes
1
answer
79
views
In pytorch, how can I parallelize of a set of boolean functions that are executed (on a GPU) repeatedly?
I have a set of Boolean functions that are independent, and (hypothetically) can be executed in parallel. I want to call those same functions repeatedly. See the code below, in which the outputs of ...
- 135
0
votes
1
answer
39
views
Re-fomulate bitwise boolean expressions between register bits in terms of register values
Suppose we have two e.g. 32-bit input registers and one equally wide output register, with boolean functions linking individual bits of these registers. Is there a method to express these bitwise ...
- 1
1
vote
1
answer
68
views
How to simplify boolean expression given kmap
Can someone explain to me how to find the simplified boolean expression given the kmap below?
kmap
I'm grouping the 1's in the upper left corner, top row, and wrap-around in the fourth column but am ...
- 11
1
vote
2
answers
150
views
How to detect whether each element of a list of element-nodes does feature a specific css-class name?
Given the following test environment ...
const nodeList = document.querySelectorAll('p');
const testArray = Array.from(nodeList);
testArray.every(function (elmNode) {
if (elmNode.classList....
- 29
1
vote
2
answers
220
views
Simplify a boolean expression with 4 variables to 3 variables
I'm doing some simplifications for a circuit and I ended up getting the following expression:
A.C'.D' + A.B'.C' + B.C.D' + B'.C.D + A'.B'.D'
which translates to the truth table where 0, 2, 3, 6, 8, 9, ...
-2
votes
2
answers
134
views
What actually happens when we put conditions without [] (brackets) in if else block in a bash script?
final=''
if [ $final ]; then echo "final"; else echo "not final"; fi;
Look at this code above. How would it apply and why, if I remove the brackets in the if block?
How does it ...
0
votes
0
answers
114
views
Updating items of Boolean array in For Each loop
How to update each item of a Boolean array in a For... Each loop?
This code updates item variable in every loop but it doesn't update the array items themselves.
Dim BoolArr(1 to 4) as Boolean
Dim ...
1
vote
0
answers
73
views
Python: How to slice a 2d array to specified range of x and y values? Also how to improve this code?
I have a meshgrid given by X and Y of unequal length and a 2d array of values vx2. I want to create a sub-2d array Z from a certain xlim and ylim. I want to create a contour plot but since matplotlib ...
