Assuming that A = True, B = False and C = True.
Give the results of the following Boolean operations
AB + BC’ (A + B’C) + B
(b) ABC’ + (B + AC’)B + A’
in boolean multiply operation is AND (&&) operation
and plus + operation is OR(||) operation
and ' operator measn NOT(!)
so,
AB + BC’ (A + B’C) + B
can be written as
(A && B) || [(B && (!C)) && (A || ((!B) && C))] || B
PUTTING THE VALUE IN THE ABOVE EQUATION
= (1 && 0) || [(0 && (!0)) && (1 || ((!1) && 1))] || 1
= 0 || [(0 && 1 )&& (1 || (0 && 1)] ||1
= 0 || [(0 && 1) && (1 || 0)] ||1
= 0 || [0 && 1] ||1
= 0 || 0 || 1
= 1
I KNOW IT IS HARD TO FOLLOW BUT THE ANSWER WILL BE 1
AND FOLLOWING THE SAME LOGIC THE ANSWER TO THE 2ND STATEMENT WILL ALSO BE 1
IF YOU WANT TO UNDERSTAND HOW THIS WORKS PLEASE READ THE DOCS
Related
I need such a condition in ts:
([treeLevel = 0] && [globalVar = GP:R > 0]) || [PIDinRootline = {$pages.2018}]
I wanna show block if page has treelevel=0 and the get var R > 0, or if page id = $pages.2018
It looks like the similar code in php:
if(($treeLevel == 0 && $r > 0) || (pid == number))
The all expression in first brackets should be right, or in second.
Is it exist the method to group it like the previous record or I can only use userfunc?
There is no grouping in TS conditions, but if you need this particular condition from your post I think it is not needed because brackets around && are useless in this case.
(p && q) || r
is exactly the same as
p && q || r
Did you tested it?
I have following query:
var sw = new Stopwatch();
sw.Start();
var model = new StatusModel();
IQueryable<StatusView> statusViewResult = db.StatusViewList;
statusViewResult = statusViewResult.Where(p =>
(query.ClustersSelected.Count == 0 || query.ClustersSelected.Contains(p.Cluster)) &&
(query.ParkNamesSelected.Count == 0 || query.ParkNamesSelected.Contains(p.ParkName)) &&
(query.TurbineNumbersSelected.Count == 0 || query.TurbineNumbersSelected.Contains(p.TurbineNumber)) &&
(query.ModelNamesSelected.Count == 0 || query.ModelNamesSelected.Contains(p.ModelName)) &&
(query.AlarmLevelSelected.Count == 0 || query.AlarmLevelSelected.Contains(p.AlarmLevel)) &&
(query.ParametersSelected.Count == 0 || query.ParametersSelected.Contains(p.Parameter)) &&
(query.TurbineTypesSelected.Count == 0 || query.TurbineTypesSelected.Contains(p.TurbineType)));
sw.Stop();
var d = sw.Elapsed.TotalMilliseconds;
So I am not doing any ToList() so I shouldn't be querying the database at this moment. However I takes around 2 seconds just for building this query - am I missing something here or is this expected?
I am trying to understand Boolean logic and operators.
I found this example but can't understand why this expression will evaluate to the one shown below.
Say, a = 0, b = 1, c = 0
Expression Will Evaluate to
val1 = !(a || b || c); !(0 || 1 || 0) = !(1) = 0
As I see it, val1 is not a or not b or not c, so why it evaluates to not 1 ?
Not(a or b or c) evaluates the or operations first, so it's not the same as (not a) or (not b) or (not c).
Indeed, it's the same as (not a) AND (not b) AND (not c).
Either operand to an OR being true will give a true result, and then the NOT flips that to a false result for the expression as a whole.
As with integer or real number arithmetic, order of operation can greatly alter the result.
.... val1 is not a or not b or not c ...
No, this is incorrect. The 0 || 1 || 0 inside the parenthesis is evaluated first. The example has it right.
Let's say val1 = 1
1 = !(0 || 1 || 0)
1 = !(1) - because it is the only value that is equal to val1
1 = 0 - then it negates it afterwards
Let's go step-by-step.
val1 = !(0 || 1 || 0);
Firstly, 0 || 1 will evaluate to 1, because || means 'true if at least one of them is true, otherwise false', and 1 = true, 0 = false.
So now it is
val1 = !(1 || 0); Here 1 || 0 will again evaluate to 1, because at least one of them is 1. Now we've got val1 = !(1);. ! means the opposite of the input, so !(1) = 0.
As I see it, val1 is not a or not b or not c, so why it evaluates to not 1 ?
Because what you say would be written as val1 = !0 || !1 || !0. Its quite different, because it doesn't have parenthesis. Parenthesis means 'evaluate everything in the parenthesis first'.
My last elseif statement does not execute even if the conditions are met:
Currency_Exchanage != 'Select...' and all other variables (ETF_Exchanage, Index_Exchanage and Stock_Exchanage) = 'Select...'
Here is the section of code that I am concerned about:
if (strcmp(ETF_Exchanage,'Select...') == 1) && (strcmp(Stock_Exchanage,'Select...') == 1) && (strcmp(Index_Exchanage,'Select...') == 1)...
(strcmp(Currency_Exchanage,'Select...') == 1)
if db == 1 && uni == 1
tickers = gnr_bloomberg; % Analsise Bloomberg natural resources
nrm=1;
elseif db == 1 && uni == 2
tickers = all_bloomberg; % Analsise Bloomberg all
nrm=1;
elseif db == 2 && uni == 1
tickers = gnr_yahoo; % Analsise Yahoo natural resources
nrm=1;
elseif db == 2 && uni == 2
tickers = all_yahoo; % Analsise Yahoo all
nrm=1;
end
else
%Yahoo inputs
if (strcmp(ETF_Exchanage,'Select...') == 0) && (strcmp(Stock_Exchanage,'Select...') == 1) && (strcmp(Index_Exchanage,'Select...') == 1)...
(strcmp(Currency_Exchanage,'Select...') == 1); %Choose exhanges from ETF
tickers = ETF_Yahoo(:,1);
Exchanges = ETF_Yahoo(:,2);
Exchange = ETF_Exchanage;
db=2; %Yahoo Selection
elseif (strcmp(Index_Exchanage,'Select...') == 0) && (strcmp(Stock_Exchanage,'Select...') == 1) && (strcmp(ETF_Exchanage,'Select...') == 1)...
(strcmp(Currency_Exchanage,'Select...') == 1); %Choose exhanges from Index
tickers = Index_Yahoo(:,1);
Exchanges = Index_Yahoo(:,2);
Exchange = Index_Exchanage;
db=2;
elseif (strcmp(Stock_Exchanage,'Select...') == 0) && (strcmp(ETF_Exchanage,'Select...') == 1) && (strcmp(Index_Exchanage,'Select...') == 1)...
(strcmp(Currency_Exchanage,'Select...') == 1); %Choose exhanges from Stock
tickers = Stock_Yahoo(:,1);
Exchanges = Stock_Yahoo(:,2);
Exchange = Stock_Exchanage;
db=2;
elseif (strcmp(Currency_Exchanage,'Select...') == 0) && (strcmp(Stock_Exchanage,'Select...') == 1) && (strcmp(Index_Exchanage,'Select...') == 1)...
(strcmp(ETF_Exchanage,'Select...') == 1); %Choose exhanges from Currency
tickers = Currency_Yahoo(:,1);
Exchanges = Currency_Yahoo(:,2);
Exchange = Currency_Exchanage;
db=2;
else
msg = 'Error occurred.\Only one Yahoo input menue must be used!';
error(msg)
end
end
Any Help would be much appropriated, I can't see where I'm going wrong here. I am using Matlab 2013a.
Put a breakpoint at the elseif statement in question and then check in the command window what your condition evaluates to.
If it does not evaluate like expected, check what the individual terms evaluate to.
It is important to actually test what the conditions evaluate to in matlab, rather than only visually comparing the string values.
Usually by that point you should get a rough idea what is wrong.
However in your case we can't do these steps for you because something is off. Your code condensed to the more reasonable minimal example
if 1 && 1 && 1...
1;
disp('I was here')
end
does not even execute in R2014a since the interpreter complains about '...' being an unexpected matlab expression.
I have this strange problem. I have a simple search requirements where a user can search a given entitiy (Say customer) based on several search criterias. User may choose to use a criteria or not. The search conditions need to 'AND' all the criteria. So I write code like this (which works)
IQueryable _customer;
_customer = from c in DS.properties
where
(txtCustomerName.Text.Length == 0 || c.name == txtCustomerName.Text)
&& (txtpropcust1.Text.Length == 0 || c.customfield1 == txtpropcust1.Text)
&& (txtpropcust2.Text.Length == 0 || c.customfield2 == txtpropcust2.Text)
&& (txtpropcust3.Text.Length == 0 || c.customfield3 == txtpropcust3.Text)
&& (txtpropcust4.Text.Length == 0 || c.customfield4 == txtpropcust4.Text)
&& (txtpropcust13.Text.Length == 0 || c.customfield13 == txtpropcust13.Text)
select c;
GridView1.DataContext = _customer;
The problem is that if I have 14 where clauses, the EF throws an error- 13 works - 14 does not.
I am using EF+WCF data service in a WPF application. Is there a setting somewhere which limits the number of where clauses?
Thanks
To simplify the resulting query, you could use:
var customers = DS.properties;
if (txtCustomerName.Text.Length > 0)
customers = customers.Where(x => x.name == txtCustomerName.Text);
if (txtpropcust1.Text.Length > 0)
customers = customers.Where(x => x.customfield1 == txtpropcust1.Text);
// etc
_customer = customers;
GridView1.DataContext = _customer;
Note that this will only add SQL where clauses when there's a need for it.