Questions tagged [boolean-expression]
A boolean expression is an expression in a programming language that produces a boolean value when evaluated, i.e. one of true or false.
boolean-expression
1,062
questions
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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 ...
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2
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24
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Google Sheets - formula for multiple values from different columns are fulfilled
I need to find a formula that can tell me if certain conditions are met in multiple columns.
I have Column A "Day of Week" and Column B "24 Hr Clock"
In column C I would like to ...
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2
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3
answers
212
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Checking for False when variable can also be None or True
Update: please see my discussion if you want to delve further into this topic! Thank you everyone for your feedback on this!
I have a boolean(ish) flag that can be True or False, with None as an ...
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0
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1
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27
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implement a function to group cells when simplifying Boolean expression using K-map
In order to implement simplification of a 5-variable Boolean expression using Karnaugh map, I write a JavaScript function to group cells (which input is a list of integers specifying minterms):
...
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25
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QueryDSL BooleanExpression exclude data if the field is null
I have a problem when try to use a filter in a query that have a null field.
if (StringUtils.isNotBlank(query)){
expression = expression.and(qAdopt.name.containsIgnoreCase(query)
...
0
votes
2
answers
61
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Evaluating logical expressions recognized by ANTLR using the System.Linq.Expressions namespace
I've defined a grammar, which I have to parse in C# and evaluate the resulted "constraints" on a list of dictionaries. The grammar is mainly boolean algebra.
Here you can check it:
grammar ...
-2
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1
answer
44
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What is the most elegant way of checking if multiple objects exist, in Node.js? [duplicate]
Suppose I have several environment variables, going by the hypothetical names OBJECT_A, OBJECT_B, OBJECT_C, etc.
I must implement a function doTheyExist() that must return a boolean.
I want to know ...
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2
answers
111
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How is this (xy)' + (yz) simplified into this (x’+y’)+z in boolean algebra?
I not understand how the first Boolean expression on the question can be simplified into the last. Please help me.
My attempt:
1. (xy)' + (yz)
2. (x' + y') + (yz) # Using de Morgan's law.
3. x' + (y' +...
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votes
1
answer
35
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Octave: Boolean AND returns wrong number
I am trying for several hours to calculate a boolean AND operation in Octave.
It return a wrong number.
I want to calculate following numbers:
result = 4037 & 63
result should be 5 but i get 1.
I ...
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1
vote
2
answers
80
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How do I get this code to accommodate any given number by only using boolean logic (no conditionals/ functions)
Here is the problem:
number = 1101
#You may modify the lines of code above, but don't move them!
#When you Submit your code, we'll change these lines to
#assign different values to the variables.
#
#...
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0
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36
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Retrieve data based on boolean logic
I'll get right to my question. I have an API that gives me a number of items based on a category I input. I can only request one category per API call. Now I want to retrieve a number of items using a ...
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1
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102
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Can reification predicates from CLP(FD) be used to check equality of logic expressions?
According to the documentation (section A.9.12), CLP(FD) constraints such as #>, #=, #/\ etc. can be reified.
Constraint #<==>/2 is supposed to be
True iff P and Q are equivalent
according ...
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1
answer
36
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Trouble with boolean logic in if (else) statements
I am trying to create a function that returns a different greeting depending on two variables: the country and time provided.
If time is greater than or equal to 0 but less than 12 it will be morning. ...
0
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1
answer
54
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designing a circuit with 3 3-bit inputs and 4 1-bit outputs
The inputs are A[2:0], B[2:0] and C[2:0] respectively. The outputs are E,RA,RB,RC.
If at least at one of the inputs (A,B,C) none of the bits are equal to 1 or if at least at one input the bits that ...
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1
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57
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Yacc : Boolean and Arithmetic expression grammars conflict
I'm implementing a compiler as part of a class, for a language which is supposed to support both arithmetic and boolean expression. Unfortunately, I'm having some trouble implementing rules for both ...
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1
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Confusion with Boolean Expressions in C / < and > are reversed? [closed]
I am a bit confused.
< means that the right side of the number is bigger, no?
So natually, the while condition
while (height > 0 && height < 9);
in
#include <cs50.h>
#include &...
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votes
2
answers
49
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What is a good way to verify if arguments of a function are numbers
I have a function which takes in 3 arguments and I want to make sure those three arguments are numbers.
As of right now, I've made this after a bit of experimenting and it seems to work but I'm not ...
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2
votes
1
answer
86
views
Reduce if/else-if on a bunch of partially overlapping conditions
I was trying to solve a coding problem which ended up with these conditionals:
x_A2 <= x_B1 OR x_A1 >= X_B2 --> 0
x_A1 <= x_B1 <= x_A2 --> x_A2 - X_B1
x_B1 <= x_A1 <= x_B2 --...
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1
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52
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Booleans Values
Which of the following will be fully evaluated that first option will be checked inclusive the second option, if the following variables represent the following boolean values
a = True
b = False
...
-2
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1
answer
98
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How is boolean xx = (43.3L == 3.333f) syntactically correct
I'm have a problem with understanding this question about syntax it says the answer is
boolean xx = (43.3L == 3.333f);
but i don't understand how it is
Which of the following Java statements are NOT ...
0
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1
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85
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Why is '(x in list_1) == True' is True but 'x in list_1 == True' is False? [duplicate]
I know this is can be a very basic question, but I found something curious on Python. I will try to explain this with the following example:
l = [1,2,3,4,5]
n1 = 1
We know the following:
print( n1 in ...
1
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2
answers
53
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Subsetting a Boolean variable in Python
When a DataFrame ("Given_DF") has a Boolean variable (such as B below),how can one subset the DataFrame to keep only rows of Variable B with True value?.
Given_DF
ID A B
0 123 ...
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1
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43
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PHP - false == 0 but false != "00" [duplicate]
I had a problem with checking falsy conditions and don't understand how 'false' works.
I tested the code above,
echo (0 == false); //->true
echo ("0" == false); //->true
echo ("0&...
1
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1
answer
49
views
check to see whether an object exists in dict
a = {1 : 4}
print(4 in a) # case 1: False
a = {1 : 's'}
print('s' in a) # case 2: False
a = {1 : None}
print(None in a) # case 3: False
a = {1: True}
print(True in a) # case 4: True
so my ...
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1
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2
answers
270
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How to solve " Controlling expression is not an 'essentially Boolean' expression " in MISRA code?
I have a simple macro function which will check the condition and return an Boolean value. Below is the snippet of code
assume: #define boolean bool
Test.h file
#define CHECK_STATE(X) (...
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1
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83
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Bool in C# works something unclear for me
Here goes an example of C# code. I did not get why in first case we will have 1 instead of 0.
Why does it return 1 instead?
static void Main(string[] args)
{
int firstNumber = 0;
bool ...
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2
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49
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Boolean Logic and For Loops
I was wondering if those familiar with codingbat's problems might be able to help me with understanding the differences between these two solutions and why one doesn't work.
The problem:
Given a ...
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0
answers
120
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Essential Prime Implicant with "don't care"
How to count Prime Implicant/ate and Essential Prime Implicant/ate when I have don't care in my K-map?
For xample, for the following K-map, how many PI and EPI do I have?:
enter image description here
...
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1
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100
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How exactly does the "and not" operation in python works [duplicate]
i am trying to learn python and for that i am watching a course, in which the core concepts of the language are being taught.
I wrote the following code, in which a secret word has to be guessed:
I ...
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1
answer
111
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Resolve Java Interface ambiguity in method parameters
I have a tree of boolean operations from a boolean expression that I have to run in Java. The tree would be something like this:
And I would need to run it in Java iteratively so that it returns me a ...
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2
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136
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How do I identify the Boolean Expression of this logic circuit?
As the title says, what can be the possible boolean expression of the logic circuit given? The Truth table is also included.Logic Circuit
I have tried to solve my own Boolean Expression and coded it ...
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1
answer
57
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Can I use a boolean mask to find if a DateTime value falls between two other DateTime values in a different dataframe
I want to filter the datapoints I have, until I only have the datapoints were the participant was asleep left. I have my dataframe with DateTime values and the values I am researching, and a different ...
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182
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SOP Boolean expression of state variable and output of a Moore FSM
Disclaimer: I'm studying for an exam, but I don't have to hand in anything.
I have the state transition diagram of the FSM and its states encoding:
I want to find the Sum-Of-Products Boolean ...
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0
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1
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47
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Python: real order of execution for equalities/inequalities in expressions? [duplicate]
Imagine this "sneaky" python code:
>>> 1 == 2 < 3
False
According to Python documentation all of the operators in, not in, is, is not, <, <=, >, >=, !=, == have the ...
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1
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54
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Boolean operator 'and', expect False answer if one expression is False?
I´m a 1 week self taught python3 guy, and i´m into the comparison and boolean operators and learn this:
True and True True
True and False False
False and True False
False and False ...
0
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0
answers
220
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How to Convert string to boolean with function CASE WHEN in PostgreSQL
Full Query:
SELECT
'' as [id],
a.OrganizationId as [organization_id],
a.AdmissionNo as [admission_no],
a.AdmissionDate as [admission_date],
p.MrNo as [mr_no],
...
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1
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Why does IF statement fail?
I have a horrible feeling that the answer to this question is going to be obvious, but...
I am reading data from a small file in MicroPython. The value of the line I read determines whether a bool ...
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Generalized product-of-sums Boolean expression with n true variables out of m total variables
Problem
How do you write a "product-of-sums" Boolean expression, in m Boolean variables, which enforces at least n of those variables being 1/true?
Attempt
Starting in the "sum-of-...
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3
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698
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Why can't I use a boolean expression in a SQL CASE expression inside a WHERE clause?
I want to write a query with the following logic:
If @fundKey is greater than 0, look for funds with a key matching @fundKey.
Otherwise, look for funds with a key less than 1000000.
If I were to ...
- 142k
3
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1
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289
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Converting SHA256 into a SAT instance / Boolean expression using Lisp
I recently came across a discussion discussing conversion of SHA256 into a SAT instance by modifying the lisp implementation of SHA256 from Ironclad - sha-256 as a boolean function
There is some ...
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1
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I keep getting an FileNotFoundException error, but I declared it thrown in the method and included a try/catch block [duplicate]
I can make this code work if I modify the main method class, but I am supposed to make it work WITHOUT modifying it at all. I'm confused as to what is causing the error.
Here is the method I have ...
0
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1
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342
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getting syntax error when checking boolean value with 'If' statement
I'm trying to detect 3 specific EMA crosses, assign them to boolean variable, plot them and set alerts when their conditions are true.
I have no problem detecting and plotting the 3 crosses when they ...
0
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1
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593
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Karnaugh map & Quine McCluskey
I would like to know if the same answer should be obtained when simplifying an expression using a karnaugh map and the mccluskey method. I guess that it does but I would prefer to get a confirmation.
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Python Sympy - Check if a variable is present in the monomials of the ANF of a Boolean expression
I have a Boolean expression that is transformed to its Algebraic Normal Form (ANF), with the logic module of Sympy. We don't know in advance what is the degree of the monomials of the ANF: it could be ...
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1
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100
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Python Sympy - Select monomials from the ANF of a Boolean expression
I have some truth table in GF(2) and I compute the corresponding Algebraic Normal Form (ANF) or Zhegalkin polynomial. Below a dummy example with two variables.
from sympy.logic.boolalg import ANFform
...
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I have trouble with changing the process of that code in Java [closed]
I have trouble with changing my code. I want to do that with a boolean and I have no clue how to do that. It is just confusing me.
This is my task:
Tyrepressure-test
It is to check whether the ...
-4
votes
1
answer
141
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Comparing an int initialization with a boolean operator for an if statement parameter
I've declared ints skyB and day, and written this line:
if (skyB == true || (day=1) != true) {
System.out.print("example text");
}
Am I correct in assuming that the code will properly ...
2
votes
1
answer
292
views
Check if all rows are equal by group ID and return boolean value
I have a data frame where a unique ID is given to each unique instance where there is a string in either title.1 or title.2. Each ID is coded with one or more names. See below:
title.1
title.2
name
...
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0
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1
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189
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React - Conditional Rendering with Switch and boolean case
I would like to clarify a doubt on React Conditional Rendering with Switch Case
I have an implementation with conditions. ie I have to set a string value based on boolean case
For example
let str = &...
- 759
0
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0
answers
427
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Kotlin elvis operator vs "... == true" boolean expression check preformance
Assume we have nullable val a: Boolean?.
In code we want to assign value of a to another non-nullable variable val b: Boolean.
If a is true then we want b also to be true
If a is false or null the we ...
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